CN207850587U - A kind of pressure and temp processing circuit and its pressure thermometer - Google Patents
A kind of pressure and temp processing circuit and its pressure thermometer Download PDFInfo
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- CN207850587U CN207850587U CN201721387182.8U CN201721387182U CN207850587U CN 207850587 U CN207850587 U CN 207850587U CN 201721387182 U CN201721387182 U CN 201721387182U CN 207850587 U CN207850587 U CN 207850587U
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Abstract
The utility model provides a kind of pressure and temp processing circuit, including：Pressure temperature measuring unit for measuring pressure and temperature signal；It is connected to pressure temperature measuring unit, the pressure and temp processing unit that the pressure and temperature signal for measuring pressure temperature measuring unit is handled；Pressure and temp processing unit is connected, the main control unit for reading and calculating the pressure and temperature signal after pressure and temp processing unit processes.The utility model additionally provides a kind of pressure thermometer, including pressure and temp processing circuit and probe, probe；Pressure and temperature sensor integration is an integral pressure thermometer by the utility model, and pass through circuit design, detection and NPN, PNP output switch parameter while realizing to pressure and temp, voltage, the output of current-mode analog quantity, and carry Self-resetting button, by programming Control NPN, PNP output switch parameter and voltage, current-mode analog quantity output quantity parameter, it is made to be relatively beneficial to commercial Application, it is easy to spread.
Description
Technical field
The utility model is related to air-treatment fields, and in particular to a kind of pressure and temp processing circuit and its pressure and temp
Meter.
Background technology
In the prior art, temperature and pressure detection sensor is incorporated into an equipment, so as to commercial Application, to use
Family brings the advantage that wiring is simple, reliability is high.Application No. is 200810196365.0 Chinese patents, disclose one kind
Pressure-temperature sensor, circuit part be include signal gathering unit, MCU, display unit and detection signal output unit.Institute
State thermistor that signal gathering unit includes collecting temperature signal, the pressure sensor for acquiring pressure signal, temperature signal and
The modulate circuit and A/D conversion circuits of pressure signal；Detection signal output unit includes temperature detection signal output circuit, pressure
Power detects signal output apparatus；The thermistor and the temperature and pressure signal of pressure sensor output are believed through excess temperature respectively
Number and pressure signal modulate circuit after, then through A/D conversion pass in MCU；MCU after temperature and pressure signal processing exporting
To display unit, while controlling the output of temperature detection signal output circuit and pressure detecting signal output circuit.Its sensor
Traditional temperature sensor, pressure sensor are combined into one, the institute for being provided simultaneously with pressure sensor and temperature sensor is active
Can, temperature detects while inhibiting foundation as the temperature drift of pressure.It is on sensor structure：Circuit part installs thermistor
In main body, one end of probe is connected with main body, and thermistor and pressure sensor are located in the other end of probe；Thermistor
Around fill heat conductor, the installation site of thermistor is close to pressure sensor.Its temperature and pressure processing circuit designs not
Enough reliable, especially temperature value A/D conversion portion circuit designs are not reasonable so that measure and there is delay；Probe structure simultaneously
It is arranged unreasonable, causes effective temperature measurement range narrow, and since probe structure makes temperature and pressure measurement have lag, temperature
Pressure shows inadequate real-time and precise；The Shortcomings in antidetonation and stability in use simultaneously, there is an urgent need to be improved.
Utility model content
To solve the above problems, the utility model provides a kind of pressure and temp processing circuit and its pressure thermometer.This
Pressure and temperature sensor integration is an integral pressure thermometer by utility model, and by circuit design, is realized to pressure
It is detected while power temperature, keeps it more convenient in commercial Application；The pressure and temp processing circuit of the utility model is set simultaneously
Meter is reasonable, realizes NPN, PNP output switch parameter, voltage, the output of current-mode analog quantity, and carry Self-resetting button, passes through programming
NPN, PNP output switch parameter and voltage, current-mode analog quantity output quantity parameter are controlled, so that it is relatively beneficial to commercial Application, is easy to push away
Extensively.
For the realization technical purpose, the technical solution of the utility model is：A kind of pressure and temp processing circuit, including：
Pressure temperature measuring unit, for measuring pressure and temperature signal；
Pressure and temp processing unit is connected to pressure temperature measuring unit, for what is measured pressure temperature measuring unit
Pressure and temperature signal is handled；
Main control unit connects pressure and temp processing unit, after reading and calculating pressure and temp processing unit processes
Pressure and temperature signal.
Further, the pressure temperature measuring unit includes：
Pressure measurement cell, using pressure ceramic, for the measurement to pressure signal；
Temperature measurement unit, using thermistor, for the measurement to temperature signal.
Further, the pressure and temp processing unit includes：
Pressure signal processing unit, using the bridge type magnetic sensor signal processing chip of model ZMD31050, for pressure
The pressure signal that power ceramics measure carries out A/D and is converted to pressure signal value, and the pressure ceramic is connected to ZMD bridge type magnetic sensors letter
Number processing chip；
Processes temperature signal unit carries out letter using three-level operational amplifier circuit for the temperature signal to thermosensitive resistance measurement
Number amplification, in thermistor access three-level operational amplifier circuit.
It is arranged model LM73's as the preferred of the utility model, outside the ZMD bridge type magnetic sensors signal processing chip
Built-in temperature sensing chip, LM73 built-in temperature sensing chips are connected to ZMD bridge type magnetic sensor signal processing chips, the list
Treated that pressure value carries out to the ZMD bridge type magnetic sensors for the temperature that piece machine is detected using LM73 built-in temperature sensing chips
Temperature-compensating.
Further, the main control unit uses the microcontroller of model PIC16F1518；
The A/D transformation results of pressure signal are passed through I by the ZMD bridge type magnetic sensors signal processing chip2C buses connect
To microcontroller, for reading the transformed pressure values of A/D by microcontroller；
The amplification result of temperature signal is connected to microcontroller by the three-level operational amplifier circuit by serial ports, for passing through monolithic
Temperature signal progress A/D is converted to temperature value by A/D ALT-CH alternate channels inside machine.
Further, output unit is set outside the main control unit, the output unit includes switch amount output unit and mould
Analog quantity output unit；Analog output unit in the form of analog quantity for exporting the transformed pressure values of A/D and temperature value；
Switch amount output unit, including：
PNP output units are connected to microcontroller by Q9 triodes, for controlling output unit by the pressure value and temperature
Angle value output switch parameter form is exported with PNP；
NPN output units are connected to microcontroller by Q15 triodes, for control output unit by the pressure value and
Temperature value output switch parameter form is exported with NPN.
Further, the first output protection unit is set outside the PNP output units, the first output protection unit by Q10,
Tri- triode compositions of Q11, Q12, play the role of overload protection；
Second output protection unit is set outside the NPN output units, and the second output protection unit is by Q16, Q17, Q18
Three triode compositions, play the role of overload protection.
Further, the analog output unit includes：
D/A converting units, using the D/A conversion chips of model DAC101, D/A conversion chips are connected to microcontroller；
0~10V voltage analog output units, are connected to D/A conversion chips, are used for the transformed pressure signals of D/A
Or temperature signal carries out simulation output with 0~10V voltage signals, and 0~10V voltage analog output units are connected to monolithic
Whether machine is worked by microcontroller control 0~10V voltage analogs output unit；
4~20mA current-mode analog quantity output units, are connected to D/A conversion chips, for believing the transformed pressure of D/A
Number or temperature signal simulation output is carried out with 4~20mA current signals, and 4~20mA current-mode analog quantity output units are connected to
Whether microcontroller is worked by microcontroller control 4~20mA current-mode analog quantity output units.
As the preferred of the utility model, display unit and external control unit outside are set outside the main control unit；
The display unit includes at least three parameter discrimination method pipes, for showing pressure value and temperature in microcontroller
Value；
The external control unit outside includes at least two Self-resetting buttons, is that NPN is defeated for adjusting switch amount output unit
Go out pattern or one kind of PNP output modes, the voltage analog for adjusting analog output unit or the output of current-mode analog quantity
Range.
A kind of pressure thermometer, including above-mentioned pressure and temp processing circuit and probe, probe；
The probe is welded on probe, and interior holding Temperature Treatment pcb board of popping one's head in is filled outside described thermistor one end and led
Logical heat carrier is placed in probe, and the thermistor other end is connected to Temperature Treatment PCB plates；
Blind hole is opened up on the probe, setting damp screw contacts pressure ceramic in blind hole, is divided on the pressure ceramic
It sets washer to contact to pressure treatment pcb board, and the pressure ceramic is electrically connected to pressure treatment pcb board.
Further, processes temperature signal unit is set on the Temperature Treatment pcb board 305；
Pressure signal processing unit is set on the pressure treatment pcb board；
The probe connects shell, passes through plastic parts holding master control pcb board, the Temperature Treatment pcb board and pressure in shell
Power processing pcb board is respectively electrically connected to master control pcb board；Main control unit and external control unit outside are set on the master control pcb board, opened
Measure output unit, output protection unit, D/A converting units, analog output unit in pass.
Further, the probe length is not less than 20mm, and probe diameter is 3 ∽ 10mm, and probe thickness is 0.3 ∽ 1.0mm.
The beneficial effects of the utility model are：
Pressure and temperature sensor integration is an integral pressure thermometer by the utility model, and by circuit design,
It realizes to being detected while pressure and temp, keeps it more convenient in commercial Application；The pressure and temp of the utility model simultaneously
Processing circuit reasonable design realizes NPN, PNP output switch parameter, voltage, the output of current-mode analog quantity, and carries Self-resetting and press
Button passes through programming Control NPN, PNP output switch parameter and voltage, current-mode analog quantity output quantity parameter；The probe of the utility model
It is reasonable with sonde configuration setting, the measurement display lag and error problem of temperature and pressure are compensated in structure, while making it
With broader measurement range, it is relatively beneficial to commercial Application, it is easy to spread.
Description of the drawings
Fig. 1 is the circuit module schematic diagram of the utility model pressure and temp processing circuit；
Fig. 2 is the circuit diagram of the utility model pressure signal processing unit；
Fig. 3 is the circuit diagram of the utility model processes temperature signal unit；
Fig. 4 is the circuit diagram of the main dummy cell of the utility model；
Fig. 5 is the circuit diagram of the utility model PNP output units and the first output protection unit；
Fig. 6 is the circuit diagram of the utility model NPN output units and the second output protection unit；
Fig. 7 is the circuit diagram of the utility model 0~10V voltage analog output units；
Fig. 8 is the circuit diagram of the utility model 4~20mA current-mode analog quantity output units；
Fig. 9 is the circuit diagram of the utility model display driver element；
Figure 10 is the circuit diagram of the utility model display unit；
Figure 11 is the overall structure diagram of the utility model pressure thermometer；
Figure 12 is the sectional view of the utility model Figure 11；
Figure 13 is the overall structure of the explosion figure of the utility model.
Specific implementation mode
The technical solution of the utility model will be clearly and completely described below.
As shown in Figure 1, a kind of pressure and temp processing circuit, including：
Pressure temperature measuring unit, for measuring pressure and temperature signal；
Pressure and temp processing unit is connected to pressure temperature measuring unit, for what is measured pressure temperature measuring unit
Pressure and temperature signal is handled；
Main control unit connects pressure and temp processing unit, after reading and calculating pressure and temp processing unit processes
Pressure and temperature signal.
Further, the pressure temperature measuring unit includes：
Pressure measurement cell, using pressure ceramic J3, for the measurement to pressure signal；
Temperature measurement unit, using thermistor, for the measurement to temperature signal.
Further, the pressure and temp processing unit includes：
As shown in Fig. 2, pressure signal processing unit, using model ZMD31050 bridge type magnetic sensor signal processing chips,
Pressure signal for measuring pressure ceramic carries out A/D and is converted to pressure signal value, and the pressure ceramic J3 is connected to ZMD bridges
At tetra- pins of VINN, VSS, VINP, VBR of formula sensor signal processing chip；
As shown in figure 3, processes temperature signal unit, the three-level operational amplifier circuit formed using U1A, U1B, U1D, for heat
The temperature signal of quick resistance measurement carries out signal amplification, and the thermistor accesses at the Vpt- in three-level operational amplifier circuit.
As the preferred of the utility model, as shown in Fig. 2, setting type outside the ZMD bridge type magnetic sensors signal processing chip
Number built-in temperature sensing chip for being LM73, LM73 built-in temperature sensing chips are connected to ZMD bridge type magnetic sensor signal processing cores
At two pins of SDA, SCL of piece, for carrying out temperature-compensating to ZMD bridge type magnetic sensor signal processing chips.
As the preferred of the utility model, as shown in Fig. 2, setting type outside the ZMD bridge type magnetic sensors signal processing chip
Number built-in temperature sensing chip for being LM73, LM73 built-in temperature sensing chips are connected to two pins of SDA, SCL of microcontroller
Place, to the ZMD bridge type magnetic sensors, treated using the temperature that LM73 built-in temperature sensing chips detect for the microcontroller
Pressure value carries out temperature-compensating.Further, the main control unit uses the microcontroller of model PIC16F1518；
As shown in figure 4, the ZMD bridge type magnetic sensors signal processing chip by the A/D transformation results SDA of pressure signal,
Two pins of SCL pass through I2C buses are connected to two pins of RC3 and RC4 of microcontroller, turn for reading A/D by microcontroller
Pressure value after changing；
As shown in figure 4, the ends amplification result TC of temperature signal are connected to monolithic by the three-level operational amplifier circuit by serial ports
At No. 23 pins of machine, for by A/D ALT-CH alternate channels inside microcontroller, temperature signal progress A/D to be converted to temperature value.
Further, output unit is set outside the main control unit, the output unit includes switch amount output unit and mould
Analog quantity output unit；Analog output unit in the form of analog quantity for exporting the transformed pressure values of A/D and temperature value；
Switch amount output unit, including：
PNP output units, as shown in figure 5, RC7 the and RB4 pins of microcontroller are connected to by two triodes of Q9, Q11,
For with PNP outputs being OUT1 by the pressure value and temperature value output switch parameter form；
NPN output units, as shown in fig. 6, the RC6 and RB5 that are connected to microcontroller by two triodes of Q15, Q16 draw
Foot, for the pressure value and temperature value to be exported OUT2 in the form of switching value.
Further, the first output protection unit is set outside the PNP output units, the first output protection unit by Q10,
Tri- triode compositions of Q11, Q12, play the role of overload protection；When there is output short-circuit, triode Q12 conductings, into one
Q10 conductings are walked, to which entire PNP output units pass through triode Q11 conducting ground connection.
Further, the first output protection unit is set outside the PNP output units, the first output protection unit by Q10,
Tri- triode compositions of Q11, Q12, play the role of overload protection；When there is output short-circuit, triode Q10 conductings, into one
Q11 conductings are walked, so that RB4 becomes low level so that microcontroller stops output, reaches protective effect.
Second output protection unit is set outside the NPN output units, and the second output protection unit is by Q16, Q17, Q18
Three triode compositions, play the role of overload protection.
Further, the analog output unit includes：
D/A converting units, using the D/A conversion chips of model DAC101, D/A conversion chips are connected to microcontroller
RA1, RA2, RA3 pin；
0~10V voltage analog output units are used for as shown in fig. 7, being connected to the DA pins of D/A conversion chips by D/
It is OUT3 that the transformed pressure signals of A or temperature signal carry out simulation output with 0~10V voltage signals, and 0~10V voltage-modes
Analog quantity output unit is connected to the CONV pins of microcontroller, and whether 0~10V voltage analogs output unit is controlled by microcontroller
Work；
4~20mA current-mode analog quantity output units, as shown in figure 8, being connected to the DA pins of D/A conversion chips, being used for will
It is OUT4 that the transformed pressure signals of D/A or temperature signal carry out simulation output with 4~20mA current signals, and 4~20mA is electric
Flow field simulation amount output unit is connected to microcontroller CONI pins, is by microcontroller control 4~20mA current-mode analog quantity output units
No work also can control CONV and CONI pins by mcu programming, further select 0~10V voltage analogs defeated
Go out pattern or 4~20mA current-mode analog quantity output modes.
As the preferred of the utility model, display unit and external control unit outside are set outside the main control unit；
As shown in Figures 9 and 10, the display unit includes at least three parameter discrimination method pipe dig1, dig2, dig3,
For showing pressure value and temperature value in microcontroller；Described three parameter discrimination method pipes dig1, dig2, dig3 pass through display
Driving unit is connected to RC1, RC2, RC3 pin of microcontroller, to drive display.The utility model also sets up LED outputs and refers to
Show unit, including OUT1 indicator lights and OUT2 indicator lights, wherein OUT1 indicator lights indicate output switch parameter state, defeated when switching
Go out pattern be output switch parameter when, OUT1 is lighted；OUT2 indicator lights indicate analog output state, when switching output mode is mould
When analog quantity exports, OUT2 is lighted).
The external control unit outside includes at least two Self-resetting buttons 6, is that NPN is defeated for adjusting switch amount output unit
Go out pattern or one kind of PNP output modes, the voltage analog for adjusting analog output unit or the output of current-mode analog quantity
Range, the switch amount output unit also have the function of hysteresis, window function and offset calibration.
As shown in figure 11, a kind of pressure thermometer, including above-mentioned pressure and temp processing circuit and probe 3, probe 316；
The probe 316 is welded on probe 3, holding Temperature Treatment pcb board 305 in probe 3, the thermistor 310
Filling conducting heat carrier is placed in probe 316 outside one end, and the thermistor other end is connected to Temperature Treatment pcb board 305；
Blind hole 312 is opened up on the probe, setting damp screw 315 contacts pressure ceramic 309, the pressure in blind hole 312
Power 309 washers setting up and down of ceramics are contacted to pressure treatment pcb board 318, and the pressure ceramic 309 is electrically connected to pressure treatment
Pcb board 318.
Further, processes temperature signal unit is set on the Temperature Treatment pcb board 305；
Pressure signal processing unit is set on the pressure treatment pcb board 318；
Master control pcb board 201, the Temperature Treatment is arranged in 3 connection shell 2 of the probe, the interior plastic parts 202 that passes through of shell 2
Pcb board 305 and pressure treatment pcb board 318 are respectively electrically connected to master control PCB plates 201；Master is set on the master control pcb board 201
Control unit and external control unit outside, switch amount output unit, output protection unit, D/A converting units, analog output unit.
Further, 316 length of the probe is not less than 20mm, 316 a diameter of 3 ∽ 10mm of probe, and 316 thickness of probe is
0.3∽1.0mm.Probe within the scope of this can solve display lag issues, display data is made to synchronize, not have to for a long time
Waiting can just stablize, and the probe structure of the utility model so that and effective temperature range extends to -40 DEG C~150 DEG C, this
The probe of kind measurement range is more traditional to be applied to industrial temperature sensor with broader measurement range, makes it that should more fit
It should be in commercial Application.As a kind of embodiment of the utility model, 3 screw threads of probe use G1 screw threads, probe diameter allowable range
For 3-5mm, production and assembly are considered, finally use a diameter of 5mm probes；Probe thickness 0.3-1.0mm answers compression strength needs to reach
To 300bar or more, 0.5mm thickness probes are finally used, are -40 DEG C by established standards temperature in probe length selection
Under (as shown in table 1), 0 DEG C (as shown in table 2), 150 DEG C (as shown in table 3), the test temperature knot under multiple probe lengths is tested
Fruit sets probe length at least 27mm.
Table 1
Table 2
Table 3
The shell 2 also sets up plug connector 205, and the output switch parameter or analog quantity for outside connected switch amount output unit are defeated
Go out the analog output of unit；
The display driver element and display unit are set on display circuit pcb board 106, and display circuit pcb board 106
It is fixed on master control pcb board 201 by screw 102；Upper cover 1 is arranged in 2 upper end of shell, and upper cover 1 and shell 2 pass through sealing ring
203 and gasket seal 204 interference fit fix, be convenient for subsequent maintenance and maintenance.1 surface of upper cover takes the form of inclined plane, and top is equipped with one
The form of a " convex " type, lower part are equipped with 2 buttons 101；Meanwhile pressing piece 105, display cover 104, silicon are additionally provided with inside upper cover 1
Glue gasket 103,105 front of pressing piece are equipped with card slot, and reverse side is equipped with stud, and display cover 104 passes through pressing piece 105 to be stuck in card slot
Interior, silica gel pad 103 is placed on 103 surfaces of display cover, primarily serves the effect of waterproof, pressing piece 104, display cover 103, silicagel pad
Piece 103 is fixed by welding in upper cover 1.
Connector 303 is set, and 303 upper end of connector passes through sealing ring 1 and gasket seal 1 and 2 lower end of shell
Interference fit, 303 lower end of connector pass through 3 interference fit of sealing ring 2 304 and probe.
Spanner card slot is symmetrically twisted in 3 outside setting 2 of the probe, is safeguarded convenient for subsequent installation, 3 lower ends of probe are outer spiral shells
Line, plain washer 3 317 is set at the top of external screw thread；The center position of a stubborn spanner card slot sets that there are one ventilative wherein
A ventilated membrane 313 is pasted above air hole in hole, and gland 314 of breathing freely is installed from 313 top of ventilated membrane, is matched with air hole interference
It closes and fixes.The design of air hole makes pressure ceramic and thermistor working environment stablize, and facilitates heat exchange.
The top and bottom of the blind hole 312 are respectively provided with a step, and the step at top is placed with insulation spacer 306, bottom
The step in portion places plain washer 2 311, and pressure ceramic 309 is placed on plain washer 2 311, and setting plain washer 1 is positioned over
On pressure ceramic 309, setting trim ring 307 is twisted plain washer 2 311, pressure ceramic 309, one 308 screw thread of plain washer by screw thread
Tightly, fixed.Damp screw passes through 2 311 stress of plain washer in pressure ceramic 309 so that pressure is buffered, while this more
The structure of a washer socket, which solves, expands with heat and contract with cold and the influence of the factors such as pressure sensing cell unbalance stress, and pressure detecting
Unit can carry out the more a models of -1bar ∽ 0.1/0.25/0.5/1/2/5/10/20/50/100/200/250/400/600bar
The detection enclosed can be selected according to the model of pressure ceramic and software into line range, especially can also be by 0.1/0.25/
The measurement of this minute-pressures of 0.5ba is also included.
The implementation steps of the utility model are as follows：
By probe 3 on external screw thread, by the utility model probe installation to required measurement gasmetry scene or
Liquid measure field pipes so that probe 316 and blind hole 312 are located in gasmetry scene or liquid measure scene, and pipeline
It is pressed by plain washer 3 317 and probe, ensure that air-tightness.Current temperature value and pressure can be read by display circuit 106
Force value can draw the output of temperature value and pressure value by plug connector 206.
Specifically, selectable press two Self-resetting buttons 6, implement function such as：
1) selection of the pattern, bound, step pitch, hysteresis and serial port function of output switch parameter.
2) pattern, starting point of analog output, damping selection.
3) unit conversion of pressure output, offset calibration, clearing offset calibration, Pressure maximum value record.
4) unit conversion, offset calibration, the minimax of temperature output directly record.
5) refreshing frequency, numeral method direction (the forward and reverse display Current Temperatures of charactron and pressure data, convenience are shown
Field observation and monitoring), temperature/pressure display switching.
Table 4 is the function menu of two Self-resetting buttons 6 of the utility model：
Table 4
The above embodiments are only illustrative of the principle and efficacy of the utility model, new not for this practicality is limited
Type.Any person skilled in the art can all carry out above-described embodiment under the spirit and scope without prejudice to the utility model
Modifications and changes.Therefore, such as those of ordinary skill in the art without departing from the revealed essence of the utility model
All equivalent modifications completed under refreshing and technological thought or change, should be covered by the claim of the utility model.
Claims (12)
1. a kind of pressure and temp processing circuit, which is characterized in that including：
Pressure temperature measuring unit, for measuring pressure and temperature signal；
Pressure and temp processing unit is connected to pressure temperature measuring unit, the pressure for measuring pressure temperature measuring unit
It is handled with temperature signal；
Main control unit connects pressure and temp processing unit, for reading and calculating the pressure after pressure and temp processing unit processes
And temperature signal.
2. a kind of pressure and temp processing circuit according to claim 1, which is characterized in that the pressure temperature measuring unit
Including：
Pressure measurement cell, using pressure ceramic, for the measurement to pressure signal；
Temperature measurement unit, using thermistor, for the measurement to temperature signal.
3. a kind of pressure and temp processing circuit according to claim 2, which is characterized in that the pressure and temp processing unit
Including：
Pressure signal processing unit, using ZMD bridge type magnetic sensor signal processing chips, the pressure for measuring pressure ceramic is believed
Number carry out A/D be converted to pressure signal value, the pressure ceramic is connected to ZMD bridge type magnetic sensor signal processing chips；
Processes temperature signal unit is carried out signal for the temperature signal to thermosensitive resistance measurement and is put using three-level operational amplifier circuit
Greatly, in the thermistor access three-level operational amplifier circuit.
4. according to a kind of pressure and temp processing circuit according to claim 3, which is characterized in that the main control unit uses
PIC single chip microcomputer.
5. a kind of pressure and temp processing circuit according to claim 4, which is characterized in that the ZMD bridge type magnetic sensors letter
The built-in temperature sensing chip of model LM73 is set outside number processing chip, and the microcontroller is examined using built-in temperature sensing chip
The temperature measured carries out temperature-compensating to the ZMD bridge type magnetic sensors treated pressure value；
The A/D transformation results of pressure signal are passed through I by the ZMD bridge type magnetic sensors signal processing chip2C buses are connected to monolithic
Machine, for reading the transformed pressure values of A/D by microcontroller；
The amplification result of temperature signal is connected to microcontroller by the three-level operational amplifier circuit, for being turned by A/D inside microcontroller
Channel is changed, temperature signal progress A/D is converted into temperature value.
6. a kind of pressure and temp processing circuit according to claim 5, which is characterized in that be arranged outside the main control unit defeated
Go out unit, the output unit includes switch amount output unit and analog output unit；Analog output unit is used for A/D
Transformed pressure value and temperature value are exported in the form of analog quantity；
Switch amount output unit, including：
PNP output units are connected to microcontroller by Q9 triodes, for controlling output unit by the pressure value and temperature value
Output switch parameter form is exported with PNP；
NPN output units are connected to microcontroller by Q15 triodes, for controlling output unit by the pressure value and temperature
Value output switch parameter form is exported with NPN.
7. a kind of pressure and temp processing circuit according to claim 6, which is characterized in that
First output protection unit is set outside the PNP output units, and the first output protection unit is by Q10, Q11, Q12 tri- three
Pole pipe forms, and plays the role of overload protection；
Second output protection unit is set outside the NPN output units, and the second output protection unit is by Q16, Q17, Q18 tri- three
Pole pipe forms, and plays the role of overload protection.
8. a kind of pressure and temp processing circuit according to claim 6, which is characterized in that the analog output unit packet
It includes：
D/A converting units, using the D/A conversion chips of model DAC101, and D/A conversion chips are connected to microcontroller；
0~10V voltage analog output units, are connected to D/A conversion chips, are used for the transformed pressure signals of D/A or temperature
It spends signal and simulation output is carried out with 0~10V voltage signals, and 0~10V voltage analog output units are connected to microcontroller, by
Whether microcontroller control 0~10V voltage analogs output unit works；
4~20mA current-mode analog quantity output units, are connected to D/A conversion chips, are used for the transformed pressure signals of D/A or temperature
It spends signal and simulation output is carried out with 4~20mA current signals, and 4~20mA current-mode analog quantity output units are connected to microcontroller,
Whether worked by microcontroller control 4~20mA current-mode analog quantity output units.
9. a kind of pressure and temp processing circuit according to claim 8, which is characterized in that be arranged outside the main control unit aobvious
Show unit and external control unit outside；
The display unit includes at least three digital display tubes, for showing pressure value and temperature value in microcontroller；
The external control unit outside includes at least two Self-resetting buttons, is that NPN exports mould for adjusting switch amount output unit
One kind of formula or PNP output modes, the voltage analog for adjusting analog output unit or current-mode analog quantity output area.
10. a kind of pressure thermometer, which is characterized in that including described in claim 9 pressure and temp processing circuit and probe, visit
Stick；
The probe is welded on probe, and interior holding Temperature Treatment pcb board of popping one's head in is filled outside described thermistor one end and led
Hot body is placed in probe, and the thermistor other end is connected to Temperature Treatment pcb board；
Blind hole is opened up on the probe, setting damp screw contacts pressure ceramic, the pressure ceramic pad setting up and down in blind hole
Circle is contacted to pressure treatment pcb board, and the pressure ceramic is electrically connected to pressure treatment pcb board.
11. a kind of pressure thermometer according to claim 10, which is characterized in that
Processes temperature signal unit is set on the Temperature Treatment pcb board；
Pressure signal processing unit is set on the pressure treatment pcb board；
The probe connects shell, and master control pcb board, the Temperature Treatment pcb board and pressure treatment pcb board difference are arranged in shell
It is electrically connected to master control pcb board.
12. a kind of pressure thermometer according to claim 10, which is characterized in that the probe length is not less than 20mm,
Probe diameter is 3 ∽ 10mm, and probe thickness is 0.3 ∽ 1.0mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721387182.8U CN207850587U (en) | 2017-10-25 | 2017-10-25 | A kind of pressure and temp processing circuit and its pressure thermometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721387182.8U CN207850587U (en) | 2017-10-25 | 2017-10-25 | A kind of pressure and temp processing circuit and its pressure thermometer |
Publications (1)
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107664553A (en) * | 2017-10-25 | 2018-02-06 | 伊玛精密电子（苏州）有限公司 | A kind of pressure and temp process circuit, the especially pressure thermometer with it |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107664553A (en) * | 2017-10-25 | 2018-02-06 | 伊玛精密电子（苏州）有限公司 | A kind of pressure and temp process circuit, the especially pressure thermometer with it |
| WO2019080657A1 (en) * | 2017-10-25 | 2019-05-02 | 伊玛精密电子（苏州）有限公司 | Pressure and temperature processing circuit, in particular, pressure thermometer having same |
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