CN1580712A - Level/pressure/temperature transducer for micro power consumption optical fiber transmission integrated storage tank - Google Patents
Level/pressure/temperature transducer for micro power consumption optical fiber transmission integrated storage tank Download PDFInfo
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- CN1580712A CN1580712A CN 03142095 CN03142095A CN1580712A CN 1580712 A CN1580712 A CN 1580712A CN 03142095 CN03142095 CN 03142095 CN 03142095 A CN03142095 A CN 03142095A CN 1580712 A CN1580712 A CN 1580712A
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Abstract
The scene-testing probe comprises three probes they are measure liquid position probe, measure liquid pressure probe and the testing liquid temperature probe, the testing pressure joint and temperature testing tube. The tested parameters of them are sent to the testing electric circuit plate by the complex pattern electric capacity sensitive members, the tested temperature signal is exchanged to electric signal and sent to testing electric circuit plate too, and the tested electric signals be exchanged to photo-pulse signal output by the signal exchanging electric circuit plate, then the terminal set exchange the photo pulse into electric pulse signals send to the light signal receive processing electric circuit, and show the tested data on the showing plate, or from the output end output the standard electric current signals to supply the other control devices to use them.
Description
Technical field
The present invention relates to a kind of transmitter that is used for the liquid level/Pressure/Temperature parameter measurement in the process control basin.
Technical background
Basin is a kind of container that generally uses in industrial automation control, be used to preserve the medium of various liquid state or gaseous state, might be inflammable and explosive medium or poisonous and hazardous medium of storage, in order to guarantee the safe operation of basin, need measure liquid level, pressure, the temperature parameter of the storage medium in the basin at any time, be used for the capacity of calculation medium and carry out liquid level control automatically.Usually need adopt liquid level, pressure, the temperature transmitter of the 4-20mA output of three platform independent to be installed in three different positions respectively to the measurement of above-mentioned three parameters measures, and need on basin, to open three holes, trouble not only is installed has also increased the possibility of leaking.Simultaneously between pulpit and scene, need to be connected with 3 pairs of leads, safety barrier also need be installed in the pulpit at some inflammable and explosive scene and adopt the essential safe type transmitter, power supply and measured value Displaying Meter that general transmitter uses also must dispose the formation more complicated of system separately.The present invention be directed to above-mentioned deficiency and fully utilize that traditional sensing technology carries out technological innovation with advanced optical communication technology and the Technological improvement plan that proposes.
Summary of the invention
The object of the present invention is to provide a kind of integrated basin transmitter of simple, easy to use and safer low-power consumption of installing.
For reaching the technological means that purpose of the present invention adopts be, a kind of integrated basin liquid level/Pressure/Temperature transmitter is provided, by on-the-spot detection probe, terminal organ and transmission medium optical fiber constitute, on-the-spot detection probe comprises the sensor housing that can insert basin inside, and be respectively applied for measuring liquid level, the level detection head of pressure and temperature, pressure detecting port and temperature sound-pipe, the combined type differential capacitor sensing unit and the testing circuit plate that are electrically connected wherein are installed in the sensor shell fluid chamber, the level detection head is connected with combined type differential capacitor sensing unit respectively with pressure detecting port, measured pressure parameter is converted to corresponding electric capacitance change and transfers to the testing circuit plate, combined type differential capacitor sensing unit one end is provided with reference pressure impulse mouth, converts detected temperature signal to electric signal and directly transfers to the testing circuit plate and the temperature detection chip is installed in the temperature sound-pipe; The power supply module and the signal processing circuit board that are electrically connected with the testing circuit plate are installed in the electronic cartridge, convert the electric signal that detects after changing to light pulse signal again through the output of transmission medium optical fiber, and introduce the atmosphere reference pressure inlet that conduit links to each other with the reference pressure impulse mouth of combined type differential capacitor sensing unit by the atmosphere reference pressure; Terminal organ comprises the photo-detector that connects transmission medium optical fiber, convert light pulse signal to electric impulse signal, be sent to the light signal receiving demodulation treatment circuit that is installed in the casing,, obtain the measurement data of liquid level/Pressure/Temperature through interlock circuit and microprocessor computing.
Above-mentioned combined type differential capacitor sensing unit comprises that four identical annulus are arranged on the both sides of a connection piece in twos symmetrically, be provided with a slice isolation diaphragm and a glass insulation metal pedestal in each annulus with center of circle through hole, the metal ball shaped electrode that respectively has a slice to have the metal extension line in the glass insulation metal pedestal constitutes the fixed electorde of capacitor, be in the common electrode that a slice central task diaphragm constitutes capacitor is set between the metal ball shaped electrode of web member the same side, thereby form by capacitor C H1, the A differential capacitor that CL1 constitutes, with by capacitor C H2, the B differential capacitor that CL2 constitutes, web member adopts welding technology that the negative pressure input end of A differential capacitor and the positive pressure input port of B differential capacitor are sealedly connected, in central task diaphragm and metal pedestal, sealing charges silicone oil between the isolation diaphragm, make and on the central task diaphragm, made it produce displacement by the measuring pressure transfer function, wherein the CH1 side of A differential capacitor connects liquid level impulse mouth, the CH2 side of differential some container of B connects reference pressure impulse mouth, has the pressure intake on the web member.
Above-mentioned level detection head is installed in the dip tube front end, and dip tube links to each other with liquid level impulse mouth by the pressure transfer tube, is marked with pilot silicone oil in the pressure transfer tube; Pressure detecting port is connected with the pressure intake through pressure guiding pipe; The sensor housing outside is welded with a flange, is used for on-the-spot detection probe is fixed on tank top; The center of flange is equipped with connecting pipe, and the other end of connecting pipe is fixed in electronic cartridge by clamp nut, has the internal lead of atmosphere reference pressure conduit and connection detection circuit plate and signal processing circuit board to pass through in the middle of it.
Above-mentioned transmission medium optical fiber is the common communications multimode optical fiber.
Above-mentioned testing circuit plate is by three two-way d type flip flop U1, U2, U3, resistance R 1, R2, R4, R5 and thermistor R3 and differential capacitor CH1, CL1, CH2, CL2 and capacitor C1, two six reverser U5, U6 and a temperature detection chip U4 constitute liquid level, pressure, temperature parameter pulse width conversion formula testing circuit, wherein an end of resistance R 1 is connected with the fixed electorde end of the capacitor C H1 of the A differential capacitor 21 that is used for Level Detection, be connected to simultaneously the Ra end (4 pin) that resets of d type flip flop U1a again, the other end of resistance R 1 is connected with the Qa end (1 pin) of trigger U1a, be connected to the input end (1 pin) of six reverser U5a simultaneously again as one of liquid level signal output, the output terminal of U5a (2 pin) links to each other with U5b input end (3 pin), and then the Qa end signal of U1a is through U5a, the shaping of U5b reverser, time-delay is in output terminal (4 pin) output of U5b; The end of R2 is connected with the fixed electorde of the capacitor C L1 of the A differential capacitor that is used for Level Detection, is connected to the Rb end (10 pin) of U1b simultaneously again, and the other end of R2 is connected with the Qb of U1b end (11 pin), is connected to the input end (5 pin) of U5c simultaneously again; The end of R4 links to each other with the fixed electorde of the capacitor C H2 of the B differential capacitor that is used for pressure detection, is connected to the Ra end (4 pin) of U3a simultaneously again, and the other end of R4 links to each other with the Qa of U3a end (1 pin), is connected to the input end (1 pin) of U6a simultaneously again; The end of R5 is connected with the fixed electorde of the capacitor C L2 of the B differential capacitor that is used for pressure detection, is connected to the Rb end (10 pin) of U3b simultaneously again, and the other end of R5 is connected with the Qb of U3b end (13 pin), is connected to the input end (5 pin) of U6c simultaneously again; The end of thermistor R3 is connected with capacitor C1, be connected to simultaneously the Ra end (4 pin) of U2a again, the other end of R3 is connected with the Qa of U2a end (1 pin), be connected to simultaneously the input end (13 pin) of U6e again, wherein, U5, an output terminal and another input end in two six reversers of U6 in per 2 reversers connect and compose one group, make input/output signal keep homophase, be input end 3 pin of the output terminal 2 pin connection U5b of U5a, output terminal 6 pin of U5c connect input end 9 pin of U5d, output terminal 12 pin of U5e connect input end 11 pin of U5f, output terminal 2 pin of U6a connect input end 3 pin of U6b, output terminal 6 pin of U6c connect input end 9 pin of U6d, and output terminal 12 pin of U6e connect input end 11 pin of U6f; Temperature detection chip U4 can be as required connects the absolute temperature surveyed high level or connects four kinds of combinations of low level by 5 pin 4, and is provided with, selection converts four kinds of different output frequencies to, signal output part 6 pin of U4, link to each other with input end 13 pin of U5e, characterize the frequency signal of measured temperature, after U5e, U5f shaping, delay are handled, export by its 10 pin.
Above-mentioned signal processing circuit board is made up of signal encoding treatment circuit and signal electro-optical conversion circuit, wherein the signal encoding treatment circuit comprises by one six reverser U9, resistance R 10, R11, RC pierce circuit with capacitor C 4 formations, wherein R10 one end connects 1 pin of U9, the other end connects an end of capacitor C 4, an end that connects simultaneously resistance R 11 again, 2 pin of U9 are connected with 3 pin, 4 pin are connected with 5 pin, be connected with another pin of C4 again simultaneously, 6 pin are connected with 9 pin, are connected with another pin of R11 again simultaneously, in its 8 pin output time clock, link to each other with 5 pin of counter U10, as its count pulse input; Counter U10 is configured to 16 system mode of operations, take out address signal at its Q1, Q2, Q3, Q4 (3,2,6,7 pin) output terminal, be connected with gating address port A, B, C, the D (10 pin, 11 pin, 14 pin, 13 pin) of two 16 analog switch U7, U8,10 pin that are U7 link to each other with 3 pin of U10 again with 10 pin of U8 simultaneously, 11 pin of U7 link to each other with 2 pin of U10 again with 11 pin of U8 simultaneously, 14 pin of U7 link to each other with 6 pin of U10 again with 14 pin of U8 simultaneously, and 13 pin of U7 are connected with 7 pin of U10 again with 13 pin of U8 simultaneously; Analog switch common port 1 pin at U8, an end that connects resistance R 6, high level VCC in the other end connection circuit, at 9 of U8,7,5,3,23,21 pin take out 6 path switching signals, respectively with 3 of U1,11 pin, 1 pin of U4,3 of U3,11 pin, 3 pin of U2 are connected, U1a, U1b, U2a, U2b, the Q end output signal of U3a5 d type flip flop and the output end signal of U4 are through reverser U5, the U6 shaping, be sent to ends analog switch U7 and corresponding one by one six switches of trigger pip analog switch U6 output after the time-delay, common port 1 pin at the U7 analog switch, generate the assembled pulse of each road detection signal of arranging by the order of setting and the time interval, finish multichannel detection signal coded modulation task.
Above-mentioned signal electro-optical conversion circuit is through the coded signal of U7 common port 1 pin output, deliver to the triggering input end 5 of two-way monostalbe trigger U11,12 pin, 3 pin of U11 connect an end of capacitor C 2, an end that connects simultaneously resistance R 7 again, 1 pin of U11 connects the other end of C2,3 pin of U11 connect the other end of R7,14 pin of U11 connect the end of C3, an end that connects simultaneously R8 again, 13 pin of U11 connect the other end of R8,15 pin of U11 connect the other end of C3, and 12 pin that 5 pin of U11 connect U11 connect common port 1 pin of U7 and an end of resistance R 9, the other end ground connection of resistance R 9 simultaneously again; U11Q end 6,10 pin are connected with 2 pin with 1 pin of U12 OR circuit respectively, and its output terminal 3 pin connect transistor Q1 base stage; Resistance R 12 1 ends are connected with the emitter of Q1, the other end is connected with the base stage of Q1, the emitter of Q1 is connected with the anode of LED light-emitting tube D1 simultaneously, the negative pole of lithium battery B1 in the negative electrode of D1 and the power supply module is connected, while is as the power supply ground of entire circuit, the positive pole of lithium battery B1 connects an end of resistance R 13, the other end of resistance R 13 connects an end of resistance R 14, the other end of R14 is connected with the collector of transistor Q1, connect capacitor C5 simultaneously and as the positive supply VCC of entire circuit, the other end ground connection of C5; By the signal driving transistors Q1 that 3 pin of U12 are exported, order about LED light-emitting tube D1 conversion and be output as light pulse signal, be coupled to optical fiber 37 outputs.
Above-mentioned signal receiving demodulation treatment circuit comprises the capacitor C6 that an end is connected with the output terminal of photo-detector, the other end of C6 is connected to the base stage of transistor Q2 and amplifies, base stage is connected to an end of resistance R 15 simultaneously again, and the emitter of transistor Q2 is connected with an end of resistance R 16.The other end connection negative supply of resistance R 15, R16 (), one end of resistance R 17 connects positive supply (V+), the collector of transistor Q2 connects with the other end of resistance R 17, collector at transistor Q2 takes out the paraphase pulse signal that amplifies, and is connected with trigger end 8 pin or 6 pin of monostalbe trigger U13 simultaneously; Be connected timing capacitor C7 between 3 pin of U13 and 1 pin, be connected timing resistor R18 between 3 pin and 2 pin, hold 10 pin at the Q of U13, take out pulse signal, be connected to clock end 3 pin of J-K flip flop U14, its Qa hold 1 pin obtain with when the measuring-signal pulsewidth equates by the tactic coded pulse of setting, pulse signal exports NOR gate circuit U15 to by the Qa end of U14, U15a wherein, the input end 1 of two doors of U15b, 4 pin hold 1 pin to be connected with the Qa of U14, another input end 2 pin ground connection of U15a door, another input end 5 pin of U15b connect an end of resistance R 19, an end that connects capacitor C 8 simultaneously, the other end of R19 is connected to output terminal 3 pin of U15a, the other end ground connection of capacitor C8,6 pin output terminals output at U15b detects the identical pulse of coded pulse that sends with presence detector, and the interruptive port of delivering to microprocessor CPU then is by software processing.
Compare with existing product, the present invention has adopted incorporate structure to carry out the measurement of liquid level/Pressure/Temperature, installs simply, and the diameter that whole device stretches in the basin is not more than 90mm; Electric wiring part adopts the COMS device mostly, sends signal by pulse mode, and total average working current is less than 90 μ A, and adopts the lithium battery power supply of a joint 10Ah capacity, and dispense with outer connecting power is easy to use and low in energy consumption.
Further describe concrete structure of the present invention and feature below with reference to accompanying drawing.
Description of drawings
Fig. 1 comprises that for according to an embodiment of the invention the scene of being installed in has integral structure and detects the transmission probe, transmission medium optical fiber, and the receiving terminal device that is installed in the pulpit is formed whole structure of transmitter synoptic diagram.
Fig. 2 is the schematic cross-section that is used for liquid level/tonometric combined type differential capacitor sensing unit of Fig. 1.
Fig. 3 measures the circuit theory diagrams that send probe for the present invention.
Fig. 4 is a receiving terminal device light signal receiving demodulation treatment circuit schematic diagram of the present invention.
Embodiment
Fig. 1 shows according to basin liquid level of the present invention/Pressure/Temperature Optical Fiber Transmission transmitter 46, is made up of on-the-spot detection probe 6, transmission medium optical fiber 37, the terminal organ 45 of integral structure.On-the-spot detection probe 6 comprises level detection 1, pressure detecting port 33 and the temperature sound-pipe 3 that is respectively applied for measuring liquid level, pressure and temperature.
Level detection 1 is installed in the front end of dip tube 34, the liquid level impulse mouth 4 that the pilot silicone oil 35 of liquid level parameter in the basin that senses in pressure transfer tube 36 is sent to combined type differential capacitor sensing unit 7 converts corresponding electric capacitance change to, delivers to testing circuit plate 29 through bundle conductor 30.Pressure detecting port 33 converts the pressure parameter in the basin to corresponding electric capacitance change after bundle conductor 30 is delivered to testing circuit plate 29 equally through the pressure impulse mouth 5 that pressure guiding pipe 31 is passed to combined type differential capacitor sensing unit 7.The temperature detection chip 2 of installing in the temperature sound-pipe 3 converts detected temperature signal to electric signal and also delivers to testing circuit plate 29 through bundle conductor 30.
Combined type differential capacitor sensing unit 7, testing circuit plate 29 are installed in sensor housing 32 chambers, its outside has constituted a hermetically-sealed construction with flange 9 seal weldings, be installed in basin inside together with dip tube 34, pressure detecting port 33 and temperature sound- pipe 3,9 tops that can be fixed on basin of flange.The whole assembly dia that stretches in the basin is not more than 90mm, is in identical temperature environment with medium in the basin, and the influence that can reduce ambient temperature is to improve the performance of transmitter.
The impulse mouth 17 of combined type differential capacitor sensing unit 7 other ends connects the atmosphere reference pressure and introduces conduit 8.Connecting pipe 28 is installed at the center of flange 9, and the atmosphere reference pressure is introduced conduit 8 and internal lead 10 passes through therebetween.The atmosphere reference pressure is introduced conduit 8 and is linked to each other with atmosphere reference pressure inlet 25 in the electronic cartridge 24, one end of internal lead 10 links to each other with testing circuit plate 29, the other end links to each other with signal processing circuit board 26 in the electronic cartridge, clamp nut 23, connecting pipe 28 and electronic cartridge 24 are tightened together, signal processing circuit board 26 is installed in the electronic cartridge 24 converts light pulse signal again to through 37 outputs of transmission medium optical fiber with the electric signal that power supply module 27 will detect after changing, the lid of electronic cartridge 24 is in the screwing hermetic state when normal the use, to stop extraneous moisture, the intrusion of dust.
An embodiment who is used for liquid level/tonometric combined type differential capacitor sensing unit 7 as shown in Figure 2.
Combined type differential capacitor sensing unit 7 is weldingly fixed on the base plate in the sensor housing 32.Combined type differential capacitor sensing unit 7 structures according to the present invention comprise that four identical annulus 11 are arranged on the both sides of web member 20 in twos symmetrically.Be provided with a slice isolation diaphragm 12 and a glass insulation metal pedestal 16 in each annulus 11 with center of circle through hole.Respectively there is a slice to have the metal ball shaped electrode 13 of metal extension line 14 in the glass insulation metal pedestal 16.Be between the metal ball shaped electrode 13 of web member 20 the same sides a slice central task diaphragm 15 is set.Each annulus 11, each isolation diaphragm 12, each metal pedestal 16 adopt welding technology to be combined into the fixed electorde of a capacitor, thereby form four fixed electordes altogether, be divided into two groups and two central task diaphragms 15 employing welding technologys composition A differential capacitors 21 and B differential capacitors 19.Web member 20 adopts welding technology that the negative pressure input end of A differential capacitor 21 and the positive pressure input port of B differential capacitor 19 are sealedly connected, sealing charges silicone oil 18 between central task diaphragm 15 and metal pedestal 16, isolation diaphragm 12, makes to be made it produce displacement on central task diaphragm 15 by the measuring pressure transfer function.Form four capacitor C H1, CL1, CH2, CL2 respectively between four metal ball shaped electrodes 13 of the disk of two central task diaphragms 15 as four electrodes (common electrode) of capacitor and metal pedestal 16, the pressure of each impulse mouth input will be passed on the central task diaphragm 15 (common electrode) by isolation diaphragm 12, silicone oil 18, make the distance between its generation displacement change common electrode and the fixed electorde, electric capacity CH1, CL1, CH2, CL2 are changed, finishing the pressure parameter change transitions is the function of electric capacitance change, handles for subsequent conditioning circuit.
Connect liquid level impulse mouth 4 in the CH1 of A differential capacitor 21 side, connect reference pressure impulse mouth 17, be communicated with, be used to detect interior pressure of basin and the difference between the external pressure with the basin external pressure in the CL2 of B differential capacitor 19 side.On web member 20, have pressure intake 5, communicate with the CH2 side of B differential capacitor 19 with the CL1 side of A differential capacitor 21 respectively, pressure in the basin is that the negative pressure of liquid level transfers to the CL1 side of A differential capacitor 21 and the CH2 side of B differential capacitor 19 by pressure intake 5, pressure in the basin only changes can cause CH2, the electric capacitance change of CL2, liquid level change in the basin is by detecting head 1, pressure transfer tube 36, pilot silicone oil 35 is passed to pressure through liquid level impulse mouth 4 on the working masks 15 of A differential capacitor 21, and the pressure reduction that the liquid level change in the basin produces changes only can make CH1, the electric capacitance change of CL1.Whole combined type differential capacitor sensing unit 7 has 10 circumferential weld-rings 22 and is formed by connecting.
The central task diaphragm 15 (common electrode) of combined type differential capacitor sensing unit 7 on electric with basin in measured medium directly be connected, also can be connected with the earth simultaneously by the shell or the special-purpose wiring of metal tank.
Electric capacity CH1, CL1, CH2, CL2 variable signal by the liquid level in the sign basin of combined type differential capacitor sensing unit 7 outputs, pressure variation, by the frequency signal of temp probe 2 with the temperature variation in the detected sign basin, deliver to testing circuit plate 29, signal processing circuit board 26 and carry out signal Processing and be modulated into light signal output, its principle of work is as follows.
Referring to Fig. 3, the drawing right side is divided into the circuit of testing circuit plate 29, and left part is the circuit of signal processing circuit board 26.Testing circuit plate 29, by three two-way d type flip flop U1, U2, U3, resistance R 1, R2, R4, R5 and thermistor R3 and differential capacitor CH1, CL1, CH2, CL2 and capacitor C1, two six reverser U5, U6 and a special-purpose temperature detection chip U4 constitute liquid level, pressure, temperature parameter pulse width conversion formula testing circuit.In the present embodiment, two-way d type flip flop U1, U2, U3 adopt CD4013, and six reverser U5, U6 adopt CD4069.And special-purpose temperature detection chip U4 adopts MAX6577 to be used for the interior temperature detection of basin, is frequency signal output with the temperature transition in the storage tank, and its advantage is that temperature and frequency have definite corresponding relation, is convenient to calculate.
Wherein the end of R1 is connected with the fixed electorde end of the capacitor C H1 of the A differential capacitor 21 that is used for Level Detection, be connected to simultaneously the Ra end (4 pin) that resets of d type flip flop U1a again, the other end of R1 is connected with the Qa of U1a end (1 pin), is connected to the input end (1 pin) of reverser U5a simultaneously again as one of liquid level signal output.And the output terminal of U5a (2 pin) links to each other with U5b input end (3 pin), then the Qa end signal of U1a is through U5a, the shaping of U5b reverser, time-delay is in output terminal (4 pin) output of USb, wherein CH1 and R1 discharge and recharge timing element as RC, when being set to rising edge, triggers d type flip flop, clock end (3 pin) input trigger pulse at d type flip flop U1a, making the Qa end of U1a is high level by low transition, by R1 CH1 is charged, the electric capacity size of CH1 is relevant with tested liquid level, the other end of CH1 (common electrode) connection circuit common port (power supply ground), when the voltage on the CH1 (be U1a4 pin Ra end voltage) when being charged to the upset level of U1a, the Qa end is a low level by the high level upset immediately, finish the variation that the electric capacity of CH1 is converted to Qa end high level pulse width, constituted pulse width detection circuit.
In like manner, the end of R2 is connected with the fixed electorde of the capacitor C L1 of the A differential capacitor 21 that is used for Level Detection, be connected to simultaneously the Rb end (10 pin) of U1b again, the other end of R2 is connected with the Qb of U1b end (11 pin), is connected to the input end (5 pin) of U5c simultaneously again.The end of R4 links to each other with the fixed electorde of the capacitor C H2 of the B differential capacitor 19 that is used for pressure detection, is connected to the Ra end (4 pin) of U3a simultaneously again, and the other end of R4 links to each other with the Qa of U3a end (1 pin), is connected to the input end (1 pin) of U6a simultaneously again.The end of R5 is connected with the fixed electorde of the capacitor C L2 of the B differential capacitor 19 that is used for pressure detection, is connected to the Rb end (10 pin) of U3b simultaneously again, and the other end of R5 is connected with the Qb of U3b end (13 pin), is connected to the input end (5 pin) of U6c simultaneously again.The end of thermistor R3 is connected with capacitor C1, be connected to simultaneously the Ra end (4 pin) of U2a again, the other end of R3 is connected with the Qa of U2a end (1 pin), be connected to simultaneously the input end (13 pin) of U6e again, wherein, U5, an output terminal and another input end in two six reversers of U6 in per 2 reversers connect and compose one group, make input/output signal keep homophase, be input end 3 pin of the output terminal 2 pin connection U5b of U5a, output terminal 6 pin of U5c connect input end 9 pin of U5d, output terminal 12 pin of U5e connect input end 11 pin of U5f, output terminal 2 pin of U6a connect input end 3 pin of U6b, output terminal 6 pin of U6c connect input end 9 pin of U6d, output terminal 12 pin of U6e connect input end 11 pin of U6f, the measured chip U4 of temperature detection probe usefulness can be as required with the absolute temperature surveyed by its 4,5 pin connect high level or connect four kinds of combinations of low level and are provided with, and select to convert to four kinds of different output frequencies.4 pin connect low level in the present embodiment, 5 pin connect high level, and corresponding output frequency is 0.25HZ/ ° of k.Signal output part 6 pin of U4 link to each other with input end 13 pin of U5e, characterize the frequency signal of measured temperature, export by its 10 pin after U5e, U5f shaping, delay are handled.
Signal processing circuit board 26 is made up of signal encoding treatment circuit and signal electro-optical conversion circuit.The signal encoding treatment circuit comprises the RC pierce circuit that is made of one six reverser U9 (adopting CD4069 in the present embodiment), resistance R 10, R11 and capacitor C 4.Wherein R10 one end connects 1 pin of U9, and the other end connects an end of capacitor C 4, connects an end of resistance R 11 simultaneously again.2 pin of U9 are connected with 3 pin, 4 pin are connected with 5 pin, be connected with another pin of C4 again simultaneously, 6 pin are connected with 9 pin, be connected with another pin of R11 again simultaneously, in its 8 pin output time clock, link to each other with 5 pin of counter U10 (adopting CD40193 among the embodiment), as its count pulse input.
Counter U10 is configured to 16 system mode of operations, at its Q1, Q2, Q3, Q4 (3,2,6,7 pin) output terminal takes out address signal, with two 16 analog switch U7, the gating address port A of U8 (adopting CD4067 among the embodiment), B, C, D (10 pin, 11 pin, 14 pin, 13 pin) be connected, promptly 10 pin of U7 link to each other with 3 pin of U10 again with 10 pin of U8 simultaneously in the present embodiment, 11 pin of U7 link to each other with 2 pin of U10 again with 11 pin of U8 simultaneously, 14 pin of U7 link to each other with 6 pin of U10 again with 14 pin of U8 simultaneously, and 13 pin of U7 are connected with 7 pin of U10 again with 13 pin of U8 simultaneously.Analog switch common port 1 pin at U8, an end that connects resistance R 6, high level VCC in the other end connection circuit, when a certain way switch on the U8 is selected, the state of this way switch output terminal will become high level from low level, produce a positive transition pulse, the width of this pulse depends on the frequency of time clock, the rising edge of this pulse will remove to trigger corresponding d type flip flop, the Q output terminal of this d type flip flop is produced and the corresponding positive pulse of RC network parameter that connects, the width of this pulse is corresponding with measured signal, has characterized the size of measured value.Select corresponding switch output as U1a, U1b, U2a, U2b, the trigger pip of a U3a5 d type flip flop and the working power of U4 according to the encoding scheme of determining.In an embodiment, take out 6 path switching signals at 9,7,5,3,23,21 pin of U8, respectively with 3,11 pin of U1,1 pin of U4,3,11 pin of U3,3 pin of U2 are connected.The Q end output signal of U1a, U1b, U2a, U2b, a U3a5 d type flip flop and the output end signal of U4 are sent to ends analog switch U7 and corresponding one by one six switches of trigger pip analog switch U6 output after reverser U5, U6 shaping, time-delay.In an embodiment, 9,7,5,3,23,21 pin, 6 way switch terminals at U7, be connected with 4,8,10 pin of U6 with 4,8,10 pin of U5 respectively, common port 1 pin at the U7 analog switch, generate the assembled pulse of each road detection signal of arranging by the order of setting and the time interval, finish multichannel detection signal coded modulation task.
The signal electro-optical conversion circuit is through the coded signal of U7 common port 1 pin output, deliver to the triggering input end of U11 two-way monostalbe trigger, adopt 5,12 pin of CD14528 among the embodiment, two monostalbe triggers that this trigger U11 is triggered by edge before and after being set to respectively, its stable state time is by the parameter decision of its external timing element resistance R, capacitor C.In an embodiment, 3 pin of U11 connect an end of capacitor C 2, an end that connects simultaneously resistance R 7 again, 1 pin of U11 connects the other end of C2,3 pin of U11 connect the other end of R7,14 pin of U11 connect the end of C3, an end that connects simultaneously R8 again, 13 pin of U11 connect the other end of R8,15 pin of U11 connect the other end of C3,12 pin that 5 pin of U11 connect U11 connect common port 1 pin of U7 and an end of resistance R 9 simultaneously again, the other end ground connection of resistance R 9, the selection of RC parameter makes monostalbe trigger trigger the burst pulse that produces when overturning about 3 μ s, will be at 5 of U11, it is arteries and veins position signal that each pulse signal of 12 pin input is converted to two burst pulses, at the Q of U11 two-way monostalbe trigger end 6, the output of 10 pin, the time interval between these two burst pulses equals to be added in 5 of U11, the pulse width of 12 pin input, finish pulsewidth, conversion between the arteries and veins position, the energy consumption when sending to reduce signal satisfies the requirement of little power consumption.Deliver to U12 OR circuit input end through the arteries and veins position signal of U11Q end 6,10 pin output and generate combination arteries and veins position signal in its Q end output.U12 adopts CD4071 in an embodiment, and its 1 pin connects 6 pin of U11, and its 2 pin connects 10 pin of U11, generates the signal output of coding arteries and veins position at its output terminal 3 pin and delivers to transistor Q1 base stage.Resistance R 12 1 ends are connected with the emitter of Q1, and the other end is connected with the base stage of Q1, make Q1 be operated in good on off state.The emitter of Q1 is connected with the anode of LED light-emitting tube D1 simultaneously, the negative pole of lithium battery B1 in the negative electrode of D1 and the power supply module 27 is connected, while is as the power supply ground of entire circuit, the positive pole of lithium battery B1 connects an end of resistance R 13, the other end of resistance R 13 connects an end of resistance R 14, the other end of R14 is connected with the collector of transistor Q1, connects capacitor C5 simultaneously and as the positive supply VCC of entire circuit.The other end ground connection of C5.
The principle of light signal receiving demodulation treatment circuit 39 is referring to Fig. 4, the 62.5/125 μ m multimode optical fiber transmission signals that optical fiber 37 adopts common communications to use, and transmission range can reach more than 1200 meters.Be sent to photo-detector 38 in the terminal organ that is installed in the pulpit through the light signal of Optical Fiber Transmission, obtain faint electric impulse signal at its output terminal.
The output terminal of photo-detector 38 is connected to the end of capacitor C6, and the other end of C6 is connected to the base stage of transistor Q2 and amplifies, and base stage is connected to an end of resistance R 15 simultaneously again, and the emitter of transistor Q2 is connected with an end of resistance R 16.The other end connection negative supply of resistance R 15, R16 (), an end of resistance R 17 connects positive supply (V+).The collector of transistor Q2 connects with the other end of resistance R 17, takes out the paraphase pulse signal of amplification at the collector of transistor Q2, is connected with trigger end 8 pin or 6 pin of monostalbe trigger U13 (adopting CD4047 in an embodiment) simultaneously.
Be connected timing capacitor C7 between 3 pin of U13 and 1 pin, be connected timing resistor R18 between 3 pin and 2 pin, constituting one can be by forward position or back along the monostalbe trigger of the timing that triggers in 5 to 25 μ s pulsewidths.U13 can be with the burst pulse broadening of input 5 to 25 μ s pulsewidths than broad pulse, and play shaping operation, as time clock with triggering following circuit reliablely and stablely.Hold 10 pin at the Q of U13, take out pulse signal, be connected to the clock end of J-K flip flop U14, adopt two J-K flip flop CD4027 in an embodiment, be connected with clock end 3 pin of one road U14a wherein.Its Qa hold 1 pin obtain with when the measuring-signal pulsewidth equates by the tactic coded pulse of setting, but the polarity of its output is uncertain.Pulse signal exports NOR gate circuit U15 to by the Qa end of U14, in implementation column, adopt double input end four XOR gate 74LS86, U15a wherein, the input end 1 of two doors of U15b, 4 pin hold 1 pin to be connected with the Qa of U14, another input end 2 pin ground connection of U15a door, another input end 5 pin of U15b connect an end of resistance R 19, an end that connects capacitor C 8 simultaneously, the other end of R19 is connected to output terminal 3 pin of U15a, the other end ground connection of capacitor C8, by selecting parameter and the encoding scheme of suitable R 19 and C8, just utilize, the mean value of the varying level of negative pulse, 6 pin output terminals at U15b can be exported the pulse that is always positive polarity, the coded pulse that detects transmission with presence detector is identical, thereby has finished resuming work of signal.
Coded pulse signal by the output of 6 pin of U15b, deliver to the interruptive port INT0 of microprocessor CPU or INT1 by software processing, coded pulse is separated, is quantized into each measured value, carry out required various mathematical operations then, show each measured value and convert the normalized current signal output of the 4-20mA of corresponding each measurement parameter to by relevant interface circuit, finish the final function of transmitter.
Though invention has been described for reference example, should be realized that in the form and details to its various variations of doing to those skilled in the art, revise all within the scope of the present invention.
Claims (10)
1. an integrated basin is with liquid level/Pressure/Temperature transmitter, by on-the-spot detection probe, terminal organ and transmission medium optical fiber constitute, it is characterized in that on-the-spot detection probe (6) comprises the sensor housing (32) that can insert basin inside, and be respectively applied for measuring liquid level, the level detection head (1) of pressure and temperature, pressure detecting port (33) and temperature sound-pipe (3), combined type differential capacitor sensing unit (7) and the testing circuit plate (29) that is electrically connected wherein is installed in sensor housing (32) chamber, the level detection head is connected with combined type differential capacitor sensing unit (7) respectively with pressure detecting port, measured pressure parameter is converted to corresponding electric capacitance change and transfers to testing circuit plate (29), combined type differential capacitor sensing unit one end is provided with reference pressure impulse mouth (17), converts detected temperature signal to electric signal and directly transfers to testing circuit plate (29) and temperature detection chip (2) is installed in the temperature sound-pipe; The power supply module (27) and the signal processing circuit board (26) that are electrically connected with the testing circuit plate are installed in the electronic cartridge (24), convert the electric signal that detects after changing to light pulse signal again through transmission medium optical fiber (37) output, and introduce the atmosphere reference pressure inlet (25) that conduit (8) links to each other with the reference pressure impulse mouth (17) of combined type differential capacitor sensing unit by the atmosphere reference pressure; Terminal organ (45) comprises the photo-detector (38) that connects transmission medium optical fiber (37), convert light pulse signal to electric impulse signal, be sent to the light signal receiving demodulation treatment circuit (39) that is installed in the casing (45), through interlock circuit and microprocessor computing, obtain the measurement data of liquid level/Pressure/Temperature.
2. transmitter according to claim 1, it is characterized in that combined type differential capacitor sensing unit (7) comprises that four identical annulus (11) are arranged on the both sides of a connection piece (20) in twos symmetrically, be provided with a slice isolation diaphragm (12) and a glass insulation metal pedestal (16) in each annulus (11) with center of circle through hole, the metal ball shaped electrode (13) that respectively has a slice to have metal extension line (14) in the glass insulation metal pedestal (16) constitutes the fixed electorde of capacitor, be in the common electrode that a slice central task diaphragm (15) constitutes capacitor is set between the metal ball shaped electrode (13) of web member (20) the same side, thereby form by capacitor C H1, the A differential capacitor (21) that CL1 constitutes, with by capacitor C H2, the B differential capacitor (19) that CL2 constitutes, web member (20) adopts welding technology that the negative pressure input end of A differential capacitor (21) and the positive pressure input port of B differential capacitor (19) are sealedly connected, in central task diaphragm (15) and metal pedestal (16), sealing charges silicone oil (18) between the isolation diaphragm (12), make and on central task diaphragm (15), made it produce displacement by the measuring pressure transfer function, wherein the CH1 side of A differential capacitor (21) connects liquid level impulse mouth (4), the CH2 side of differential some container of B (19) connects reference pressure impulse mouth (17), has pressure intake (5) on the web member (20).
3. transmitter according to claim 2, it is characterized in that level detection head (1) is installed in dip tube (34) front end, dip tube (34) links to each other with liquid level impulse mouth (4) by pressure transfer tube (36), is marked with pilot silicone oil (35) in the pressure transfer tube (36); Pressure detecting port (33) is connected with pressure intake (5) through pressure guiding pipe (31); Sensor housing (32) outside is welded with a flange (9), is used for on-the-spot detection probe (6) is fixed on tank top; The center of flange (9) is equipped with connecting pipe (28), the other end of connecting pipe (28) is fixed in electronic cartridge by clamp nut (23), has the internal lead (10) of atmosphere reference pressure conduit (8) and connection detection circuit plate (29) and signal processing circuit board (26) to pass through in the middle of it.
4. according to claim 1,2 or 3 described transmitters, it is characterized in that transmission medium optical fiber (37) is the common communications multimode optical fiber.
5. transmitter according to claim 1, it is characterized in that testing circuit plate (29) is by three two-way d type flip flop (U1, U2, U3), resistance (R1, R2, R4, R5) with thermistor (R3) and differential capacitor (CH1, CL1, CH2, CL2) and capacitor (C1), two six reverser (U5, U6) and a temperature detection chip (U4) constitute liquid level, pressure, temperature parameter pulse width conversion formula testing circuit, wherein an end of resistance R 1 is connected with the fixed electorde end of the capacitor C H1 of the A differential capacitor (21) that is used for Level Detection, be connected to simultaneously the Ra end (4 pin) that resets of d type flip flop U1a again, the other end of resistance R 1 is connected with the Qa end (1 pin) of trigger U1a, be connected to the input end (1 pin) of six reverser U5a simultaneously again as one of liquid level signal output, the output terminal of U5a (2 pin) links to each other with U5b input end (3 pin), and then the Qa end signal of U1a is through U5a, the shaping of U5b reverser, time-delay is in output terminal (4 pin) output of U5b; The end of R2 is connected with the fixed electorde of the capacitor C L1 of the A differential capacitor (21) that is used for Level Detection, be connected to simultaneously the Rb end (10 pin) of U1b again, the other end of R2 is connected with the Qb of U1b end (11 pin), is connected to the input end (5 pin) of U5c simultaneously again; The end of R4 links to each other with the fixed electorde of the capacitor C H2 of the B differential capacitor (19) that is used for pressure detection, is connected to the Ra end (4 pin) of U3a simultaneously again, and the other end of R4 links to each other with the Qa of U3a end (1 pin), is connected to the input end (1 pin) of U6a simultaneously again; The end of R5 is connected with the fixed electorde of the capacitor C L2 of the B differential capacitor (19) that is used for pressure detection, be connected to simultaneously the Rb end (10 pin) of U3b again, the other end of R5 is connected with the Qb of U3b end (13 pin), is connected to the input end (5 pin) of U6c simultaneously again; The end of thermistor R3 is connected with capacitor C1, be connected to simultaneously the Ra end (4 pin) of U2a again, the other end of R3 is connected with the Qa of U2a end (1 pin), be connected to simultaneously the input end (13 pin) of U6e again, wherein, U5, an output terminal and another input end in two six reversers of U6 in per 2 reversers connect and compose one group, make input/output signal keep homophase, be input end 3 pin of the output terminal 2 pin connection U5b of U5a, output terminal 6 pin of U5c connect input end 9 pin of U5d, output terminal 12 pin of U5e connect input end 11 pin of U5f, output terminal 2 pin of U6a connect input end 3 pin of U6b, output terminal 6 pin of U6c connect input end 9 pin of U6d, and output terminal 12 pin of U6e connect input end 11 pin of U6f; Temperature detection chip U4 can be as required connects the absolute temperature surveyed high level or connects four kinds of combinations of low level by 5 pin 4, and is provided with, selection converts four kinds of different output frequencies to, signal output part 6 pin of U4, link to each other with input end 13 pin of U5e, characterize the frequency signal of measured temperature, after U5e, U5f shaping, delay are handled, export by its 10 pin.
6. transmitter according to claim 5, it is characterized in that signal processing circuit board (26) is made up of signal encoding treatment circuit and signal electro-optical conversion circuit, wherein the signal encoding treatment circuit comprises by one six reverser (U9), resistance (R10, R11), and the RC pierce circuit of electric capacity (C4) formation, wherein R10 one end connects 1 pin of U9, the other end connects an end of capacitor C 4, an end that connects simultaneously resistance R 11 again, 2 pin of U9 are connected with 3 pin, 4 pin are connected with 5 pin, be connected with another pin of C4 again simultaneously, 6 pin are connected with 9 pin, be connected with another pin of R11 again simultaneously, in its 8 pin output time clock, link to each other with 5 pin of counter U10, as its count pulse input; Counter U10 is configured to 16 system mode of operations, take out address signal at its Q1, Q2, Q3, Q4 (3,2,6,7 pin) output terminal, be connected with gating address port A, B, C, the D (10 pin, 11 pin, 14 pin, 13 pin) of two 16 analog switch U7, U8,10 pin that are U7 link to each other with 3 pin of U10 again with 10 pin of U8 simultaneously, 11 pin of U7 link to each other with 2 pin of U10 again with 11 pin of U8 simultaneously, 14 pin of U7 link to each other with 6 pin of U10 again with 14 pin of U8 simultaneously, and 13 pin of U7 are connected with 7 pin of U10 again with 13 pin of U8 simultaneously; Analog switch common port 1 pin at U8, an end that connects resistance R 6, high level VCC in the other end connection circuit, at 9 of U8,7,5,3,23,21 pin take out 6 path switching signals, respectively with 3 of U1,11 pin, 1 pin of U4,3 of U3,11 pin, 3 pin of U2 are connected, U1a, U1b, U2a, U2b, the Q end output signal of U3a5 d type flip flop and the output end signal of U4 are through reverser U5, the U6 shaping, be sent to ends analog switch U7 and corresponding one by one six switches of trigger pip analog switch U6 output after the time-delay, common port 1 pin at the U7 analog switch, generate the assembled pulse of each road detection signal of arranging by the order of setting and the time interval, finish multichannel detection signal coded modulation task.
7. transmitter according to claim 6, it is characterized in that the coded signal of signal electro-optical conversion circuit through the output of U7 common port 1 pin, deliver to the triggering input end 5 of two-way monostalbe trigger U11,12 pin, 3 pin of U11 connect an end of capacitor C 2, an end that connects simultaneously resistance R 7 again, 1 pin of U11 connects the other end of C2,3 pin of U11 connect the other end of R7,14 pin of U11 connect the end of C3, an end that connects simultaneously R8 again, 13 pin of U11 connect the other end of R8, and 15 pin of U11 connect the other end of C3,12 pin that 5 pin of U11 connect U11 connect common port 1 pin of U7 and an end of resistance R 9, the other end ground connection of resistance R 9 simultaneously again; U11Q end 6,10 pin are connected with 2 pin with 1 pin of U12 OR circuit respectively, and its output terminal 3 pin connect transistor Q1 base stage; Resistance R 12 1 ends are connected with the emitter of Q1, the other end is connected with the base stage of Q1, the emitter of Q1 is connected with the anode of LED light-emitting tube D1 simultaneously, the negative pole of lithium battery B1 in the negative electrode of D1 and the power supply module (27) is connected, while is as the power supply ground of entire circuit, the positive pole of lithium battery B1 connects an end of resistance R 13, the other end of resistance R 13 connects an end of resistance R 14, the other end of R14 is connected with the collector of transistor Q1, connect capacitor C5 simultaneously and as the positive supply VCC of entire circuit, the other end ground connection of C5; By the signal driving transistors Q1 that 3 pin of U12 are exported, order about LED light-emitting tube D1 conversion and be output as light pulse signal, be coupled to optical fiber 37 outputs.
8. transmitter according to claim 7, it is characterized in that signal receiving demodulation treatment circuit (39) comprises the capacitor C6 that an end is connected with the output terminal of photo-detector (38), the other end of C6 is connected to the base stage of transistor Q2 and amplifies, base stage is connected to an end of resistance R 15 simultaneously again, and the emitter of transistor Q2 is connected with an end of resistance R 16.The other end connection negative supply of resistance R 15, R16 (), one end of resistance R 17 connects positive supply (V+), the collector of transistor Q2 connects with the other end of resistance R 17, collector at transistor Q2 takes out the paraphase pulse signal that amplifies, and is connected with trigger end 8 pin or 6 pin of monostalbe trigger U13 simultaneously; Be connected timing capacitor C7 between 3 pin of U13 and 1 pin, be connected timing resistor R18 between 3 pin and 2 pin, hold 10 pin at the Q of U13, take out pulse signal, be connected to clock end 3 pin of J-K flip flop U14, its Qa hold 1 pin obtain with when the measuring-signal pulsewidth equates by the tactic coded pulse of setting, pulse signal exports NOR gate circuit U15 to by the Qa end of U14, U15a wherein, the input end 1 of two doors of U15b, 4 pin hold 1 pin to be connected with the Qa of U14, another input end 2 pin ground connection of U15a door, another input end 5 pin of U15b connect an end of resistance R 19, an end that connects capacitor C 8 simultaneously, the other end of R19 is connected to output terminal 3 pin of U15a, the other end ground connection of capacitor C8,6 pin output terminals output at U15b detects the identical pulse of coded pulse that sends with presence detector, and the interruptive port of delivering to microprocessor CPU then is by software processing.
9. transmitter according to claim 8 is characterized in that the liquid level/Pressure/Temperature measured value after the machine software processes as calculated can be presented on the measurement parameter display panel (42) of terminal organ (45).
10. transmitter according to claim 8, after it is characterized in that as calculated the machine software processes, export three the tunnel simultaneously from the signal output terminal (44) of terminal organ (45) and characterize the normalized current signals of each measurement result of liquid level/Pressure/Temperature for other opertaing device use.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 03142095 CN1281928C (en) | 2003-08-06 | 2003-08-06 | Level/pressure/temperature transducer for micro power consumption optical fiber transmission integrated storage tank |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 03142095 CN1281928C (en) | 2003-08-06 | 2003-08-06 | Level/pressure/temperature transducer for micro power consumption optical fiber transmission integrated storage tank |
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| CN1580712A true CN1580712A (en) | 2005-02-16 |
| CN1281928C CN1281928C (en) | 2006-10-25 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101883918A (en) * | 2007-12-03 | 2010-11-10 | 依维柯公司 | Integrated pressure and level sensor of a cooling fluid and engine comprising said sensor |
| CN102789026A (en) * | 2011-05-18 | 2012-11-21 | 亚洲光学股份有限公司 | Optical monitoring module |
| CN104393212A (en) * | 2014-12-11 | 2015-03-04 | 哈尔滨东方报警设备开发有限公司 | Conveniently-replaced battery for portable gas detector |
| CN104697607A (en) * | 2015-02-06 | 2015-06-10 | 太仓天衡电子科技有限公司 | Non-contact type digital liquid level detection instrument and working method thereof |
| CN107917669A (en) * | 2017-11-15 | 2018-04-17 | 苏州润桐专利运营有限公司 | A kind of optical fibre displacement sensor demodulation method |
| CN112731024A (en) * | 2020-12-22 | 2021-04-30 | 常州天川机电科技有限公司 | Intelligent fault diagnosis device for cooling tower fan |
| CN112729388A (en) * | 2020-12-22 | 2021-04-30 | 常州天川机电科技有限公司 | Digital three-parameter safety monitoring probe |
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2003
- 2003-08-06 CN CN 03142095 patent/CN1281928C/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101883918A (en) * | 2007-12-03 | 2010-11-10 | 依维柯公司 | Integrated pressure and level sensor of a cooling fluid and engine comprising said sensor |
| CN102789026A (en) * | 2011-05-18 | 2012-11-21 | 亚洲光学股份有限公司 | Optical monitoring module |
| CN104393212A (en) * | 2014-12-11 | 2015-03-04 | 哈尔滨东方报警设备开发有限公司 | Conveniently-replaced battery for portable gas detector |
| CN104697607A (en) * | 2015-02-06 | 2015-06-10 | 太仓天衡电子科技有限公司 | Non-contact type digital liquid level detection instrument and working method thereof |
| CN107917669A (en) * | 2017-11-15 | 2018-04-17 | 苏州润桐专利运营有限公司 | A kind of optical fibre displacement sensor demodulation method |
| CN112731024A (en) * | 2020-12-22 | 2021-04-30 | 常州天川机电科技有限公司 | Intelligent fault diagnosis device for cooling tower fan |
| CN112729388A (en) * | 2020-12-22 | 2021-04-30 | 常州天川机电科技有限公司 | Digital three-parameter safety monitoring probe |
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| CN1281928C (en) | 2006-10-25 |
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