CN201285331Y - Pressure temperature sensor - Google Patents
Pressure temperature sensor Download PDFInfo
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- CN201285331Y CN201285331Y CNU2008200393886U CN200820039388U CN201285331Y CN 201285331 Y CN201285331 Y CN 201285331Y CN U2008200393886 U CNU2008200393886 U CN U2008200393886U CN 200820039388 U CN200820039388 U CN 200820039388U CN 201285331 Y CN201285331 Y CN 201285331Y
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Abstract
The utility model relates to a pressure and temperature sensor. A circuit of the pressure and temperature sensor comprises a signal collection unit, an MCU, a display unit and a detecting signal output unit, wherein the signal collection unit comprises a thermal resistor for collecting temperature signals, a pressure sensor for collecting pressure signals, a temperature and pressure signal modulating circuit and an A/D converting circuit, the detecting signal output unit comprises a temperature detecting signal output circuit and a pressure detecting signal output circuit, temperature and pressure signals transmitted by the thermal resistor and the pressure sensor respectively pass through the temperature and pressure signal modulating circuit and then are converted into the MCU through the A/D converting circuit, the MCU processes the temperature and pressure signals and then transmits the temperature and pressure signals to the display unit, and the MCU also controls the output of the temperature detecting signal output circuit and the pressure detecting signal output circuit. The pressure temperature sensor combines a traditional temperature sensor and a traditional pressure sensor into a single unit and also has all functions of the traditional pressure sensor and the traditional temperature sensor, and the temperature detection is also taken as the basis of pressure temperature inhibition.
Description
Technical field
The present invention relates to a kind of detecting instrument, is a kind of pressure and temp detecting instrument by it
Background technology
In the prior art, the detection for the pressure and temperature of gas or liquid is two independent products.Pressure transducer is used for pressure monitoring system, when the pressure in the system reaches the pressure threshold of setting, produces detection signal, is used to protect the interlock protection system.Temperature sensor is used for temperature monitoring system, when temperature reaches the threshold values of setting, produces detection signal, is used to protect the interlock protection system.
More than two kinds of equipment be the most frequently used in the automated system, can use this two classes sensor in the most systems simultaneously.As two independently checkout equipment equipment inconvenience that will inevitably bring operation, safeguard and install to the user respectively, bring the integrity problem that system wiring is complicated and use simultaneously.
Summary of the invention
The objective of the invention is: in order to solve the problem of installation in the prior art, operation, maintenance, wiring inconvenience, the utility model proposes a kind of pressure-temperature sensor, pressure transducer and temperature sensor are united two into one, make it possess all functions of pressure transducer and temperature sensor simultaneously.
The technical solution of the utility model is,
Pressure-temperature sensor is made up of circuit part and structure division.
Its circuit part is the whole system operation core, comprises signal gathering unit, MCU, display unit and detection signal output unit.Described signal gathering unit comprise the collecting temperature signal thermistor, gather the modulate circuit and the A/D change-over circuit of pressure transducer, temperature signal and the pressure signal of pressure signal; The detection signal output unit comprises temperature detection signal output circuit, pressure detecting signal output circuit; After the temperature and pressure signal of described thermistor and pressure transducer output passes through the modulate circuit of temperature signal and pressure signal respectively, pass among the MCU through the A/D conversion again; MCU outputs to display unit after the temperature and pressure signal Processing, controls the output of temperature detection signal output circuit and pressure detecting signal output circuit simultaneously.
Also comprise keyboard, keyboard connects the input end of MCU.Described A/D converter comprises 2 passages at least.
The temperature detection signal output circuit has two-way output; The pressure detecting signal output circuit has two-way output; The simulating signal output that described two-way output is output of PNP/NPN switching signal and 4-20mA.
Described pressure transducer adopts the ceramic pressure sensing chip; The modulate circuit of described pressure signal is a signal amplification circuit; The differential signal that the pressure sensitive sheet produces is through exporting a passage of A/D converter to after the signal amplification circuit amplification; MCU control A/D converter also therefrom reads the pressure on the number signal, after the calculating, again force value is sent into display unit and shows; According to the signal of keyboard output, controlled pressure detection signal output unit is exported corresponding switching signal and/or simulating signal simultaneously.
The modulate circuit of described temperature signal is a signal amplification circuit, and this signal amplification circuit comprises a constant current source; Constant current source connects thermistor; After amplifying through signal amplification circuit, the voltage signal of the generation at thermistor two ends exports another passage of A/D converter to; MCU control A/D converter also therefrom reads the temperature digital signal, and goes out actual temperature value in internal calculation and send into display unit; According to the signal of keyboard output, controlled pressure detection signal output unit is exported corresponding switching signal and simulating signal simultaneously.
Temperature compensation in the calculating of described force value is that MCU collects temperature value, calculates corresponding pressure compensation with this temperature value, this offset is counted in the force value of system again.
Described display unit is the LCD display module.
This sensor can three directions (0 °, 90 ° and 180 °) video data (on LCD, the direction of character can be three directions), and implementation method is as follows:
0 °, 90 ° and 180 ° three direction video datas codings of single-chip microcomputer definition earlier; Calculate again and need data presented; Judge the direction value of keyboard input (instruction that the user uses 0 °, 90 ° and 180 ° three directions of keyboard input to show) again; According to the different directions value call different directions explicit function (this function is a function common in the prior art,, calculates the coding of video data on this display direction by lookup table mode that is, again coding output to the counterparty to the LCD section on; Described table is meant the digital coding table of three directions, defines in header file during programming) video data.
When the display direction of this sensor installation site display module and user's view direction not over against, the user just can adjust the display direction of display text by keyboard so, conveniently watches.
Described temperature detection signal output circuit and pressure detecting signal output circuit are respectively equipped with short-circuit protection circuit; Two short-circuit protection circuits are distinguished the electric current of collecting temperature, pressure detecting signal output circuit output signal, and the output terminal of two short-circuit protection circuits connects MCU.
Structure division comprises probe and main body; Circuit part is installed thermistor in main body; One end of probe is connected with main body, and thermistor and pressure transducer are located in the other end of probe; Fill heat conductor around the thermistor; Pressure transducer is pressed close in the installation site of thermistor.
The output terminal of described MCU also is connected with LED, is used for indication sensor output type unit.
Convert by software, display unit can demonstrate 4 kinds of unit: BAR, PSI, KGF, the MP of pressure, simultaneously two kinds of: ℃, ℉ of unit of displays temperature.(can also pass through keyboard Adjustment System parameter, can on three directions, observe the value of temperature and pressure.)
The benefit of native system temperature, pressure unification is: because ceramic pressure sensor has temperature drift, by system to gathering of temperature temperature value, remove to calculate corresponding pressure compensation with this temperature value, and this offset is counted in the force value of system, suppressed temperature drift.
Compared with prior art, the advantage of this sensor is:
1, traditional temperature sensor, pressure transducer are united two into one, possess all functions of pressure transducer and temperature sensor simultaneously.
2, the detection of temperature is floated the inhibition foundation as the temperature of pressure simultaneously.
3, the user can be three direction observed data.
Description of drawings
Fig. 1 is the schematic block circuit diagram of this sensor
Fig. 2 is a temperature acquisition partial circuit synoptic diagram
Fig. 3 is a PNP signal output apparatus synoptic diagram
Fig. 4 is a NPN signal output apparatus synoptic diagram
Fig. 5 is the program flow diagram that this sensor is realized three directions (0 °, 90 ° and 180 °) observed data
Embodiment
The invention will be further described below in conjunction with accompanying drawing and embodiment.
Pressure-temperature sensor structurally, is made of probe, circuit board, LCD display module.
As Fig. 1, circuit part is the whole system operation core, comprises signal gathering unit, MCU, LCD display module and detection signal output unit.Described signal gathering unit comprise the collecting temperature signal thermistor, gather the modulate circuit and the A/D change-over circuit of pressure transducer, temperature signal and the pressure signal of pressure signal; The detection signal output unit comprises temperature detection signal output circuit, pressure detecting signal output circuit; After the temperature and pressure signal of described thermistor and pressure transducer output passes through the modulate circuit of temperature signal and pressure signal respectively, pass among the MCU through the A/D conversion again; MCU outputs to after the temperature and pressure signal Processing and also comprises keyboard, and keyboard connects the input end of MCU.Control the output of temperature detection signal output circuit and pressure detecting signal output circuit simultaneously.Also comprise keyboard, keyboard connects the input end of MCU.
Be packaged with the ceramic pressure sensing chip in the probe, the precision of ceramic sensor element is a per mille, when the external world have pressure act on above the time, produce faint differential signal, enter amplifying circuit then, circuit adopts difference to amplify, and adopts this circuit to suppress random disturbance, and amplifying circuit adopts integrated transporting discharging TLC2741.
Described A/D converter adopts the ICL7109 of 12 precision, and this chip is a biproduct somatotype converter, and its stability is fine, and MCU can choose temperature signal or pressure signal by controlling its sampling channel.Pressure signal passage 1, temperature signal passage 2, this circuit and software systems are a plurality of scope 2BAR of corresponding pressure, 5BAR, 10BAR, 20BAR, 50BAR, 100BAR, 200BAR, 400BAR selects by interface menu, determines that according to the model of pottery probe the scope of software is selected, and last MCU internal calculation shows force value.
Encapsulated thermistor in probe, ceramic pressure sensor is pressed close in the installation site of thermistor, and purpose is for the temperature drift of compensation pottery better.As Fig. 2, act on the thermistor with constant current source, obtain corresponding analog voltage signal, delivering to modulate circuit handles, feeble signal is amplified, deliver to another passage of A/D converter, by the control of MCU to the sampling channel of A/D, MCU therefrom obtains the temperature digital signal, and goes out actual temperature value in internal calculation and send into display unit.
The LCD display module has such characteristics as display unit, and described sensor can demonstrate 4 kinds of unit: BAR, PSI, KGF, the MP of pressure, simultaneously two kinds of: ℃, ℉ of unit of displays temperature.Another characteristics that display unit had are to pass through keyboard Adjustment System parameter, can observe the value of temperature and pressure on three directions, have solved because the inconvenient observed data situation that the actual environment of installing brings.As shown in Figure 5,0 °, 90 ° and 180 ° three direction video datas codings of single-chip microcomputer definition earlier; Calculate again and need data presented; Judge the direction value of keyboard input (instruction that the user uses 0 °, 90 ° and 180 ° three directions of keyboard input to show) again; According to the different directions value call different directions explicit function (this function is a function common in the prior art,, calculates the coding of video data on this display direction by lookup table mode that is, again coding output to the counterparty to the LCD section on; Described table is meant the digital coding table of three directions, defines in header file during programming.The definition of the digital coding table of either direction all is means commonly used in the existing programming technique in described three directions, just has not been further limited at this) video data.
The LCD display module mainly is divided into drive part and LCD faceplate part.LCD is designed to 162 pixels.Software programming for convenience, each point can independently be controlled, and adopts 9 COM ends and 33 sections, so the 16*48 pixel is adopted in driving, the design drives with HT1626.
Another benefit of native system temperature, pressure unification is: because ceramic pressure sensor has temperature drift, by system to gathering of temperature temperature value, remove to calculate corresponding pressure compensation with this temperature value, and this compensation value calculation is gone in the force value of system, suppressed temperature drift, system adopts anti-interference strong single-chip microcomputer PIC18F2520, and the operate as normal at abominable scene is played guarantee effect.
Described pressure compensated method is as follows:
Through experience checking, described pressure transducer probe temperature floats on and satisfies a linear relationship in the whole operating temperature range, i.e. y1=k*x+2.7, and unit is Bar, x is a real time temperature, k=-7/25 (fixed value).Under a certain temperature, the force value of actual measurement and this temperature are floated the force value of doing after difference just obtains compensating, suppose that the actual measurement pressure portion is y2, then after the compensation be y=y2+ (y1).
This sensor signal output is combined type output, and system design is the output of temperature two-way, the output of pressure two-way.The PNP or the NPN way of output all can be selected by menu, have saved user's cost to a certain extent, make things convenient for the user to tackle the variation of field wiring type.According to the setting of user to systematic parameter, this sensor is exported the simulating signal (because the simulating signal output circuit belongs to circuit common in the art, not being further limited at this) of corresponding switching signal and 4-20mA.
Output is all established short-circuit protection circuit, the current value of this circuit sampling output signal, and the output terminal of circuit connects MCU.This circuit is by the current value of sampling resistor sampled output signal; when output signal during greater than 400mA; short-circuit protection circuit sends a signal to MCU; MCU closes and short circuit output occurs; and on the LCD interface, point out short circuit; wait for that the user gets rid of fault, protected the steady operation of whole application system preferably.
Shown in Fig. 3,4:
PNP output: when control signal is high level; triode Q3 conducting; metal-oxide-semiconductor Q4 conducting; produce the PNP output signal; resettable fuse F1 of the output of metal-oxide-semiconductor series connection on this circuit, when the electric current in the circuit surpassed the rated current of resettable fuse, it self resistance will become very big; thereby the electric current in the entire circuit is reduced, play the effect of overload protection.When control signal was low level, PNP output was just closed.
The NPN output: when control signal was high level, metal-oxide-semiconductor Q5 was with regard to conducting, produced the PNP output signal, the output of the metal-oxide-semiconductor Q5 resettable fuse F2 that also connects on this circuit, and its effect is identical with the PNP output.
Claims (9)
1, a kind of pressure-temperature sensor, its circuit part is for comprising signal gathering unit, MCU, display unit and detection signal output unit, it is characterized in that described signal gathering unit comprise the collecting temperature signal thermistor, gather the modulate circuit and the A/D change-over circuit of pressure transducer, temperature signal and the pressure signal of pressure signal; The detection signal output unit comprises temperature detection signal output circuit, pressure detecting signal output circuit; After the temperature and pressure signal of described thermistor and pressure transducer output passes through the modulate circuit of temperature signal and pressure signal respectively, pass among the MCU through the A/D conversion again; MCU outputs to display unit after the temperature and pressure signal Processing, controls the output of temperature detection signal output circuit and pressure detecting signal output circuit simultaneously.
2, pressure-temperature sensor according to claim 1 is characterized in that also comprising keyboard, and keyboard connects the input end of MCU.
3, pressure-temperature sensor according to claim 1 and 2 is characterized in that described A/D converter comprises 2 passages at least.
4, pressure-temperature sensor according to claim 3 is characterized in that the temperature detection signal output circuit has two-way output; The pressure detecting signal output circuit has two-way output; The simulating signal output that described two-way output is output of PNP/NPN switching signal and 4-20mA.
5, pressure-temperature sensor according to claim 4 is characterized in that described pressure transducer adopts the ceramic pressure sensing chip; The modulate circuit of described pressure signal is a signal amplification circuit; The differential signal that the pressure sensitive sheet produces is through exporting a passage of A/D converter to after the signal amplification circuit amplification; MCU control A/D converter also therefrom reads the pressure on the number signal, after the calculating, again force value is sent into display unit and shows; According to the signal of keyboard output, controlled pressure detection signal output unit is exported corresponding switching signal and/or simulating signal simultaneously.
6, pressure-temperature sensor according to claim 5, the modulate circuit that it is characterized in that described temperature signal is a signal amplification circuit, this signal amplification circuit also comprises a constant current source; Constant current source connects thermistor; After amplifying through signal amplification circuit, the voltage signal of the generation at thermistor two ends exports another passage of A/D converter to; MCU control A/D converter also therefrom reads the temperature digital signal, and goes out actual temperature value in internal calculation and send into display unit; According to the signal of keyboard output, controlled pressure detection signal output unit is exported corresponding switching signal and simulating signal simultaneously.
7, pressure-temperature sensor according to claim 1 and 2 is characterized in that described display unit is the LCD display module.
8, pressure-temperature sensor according to claim 1 is characterized in that described temperature detection signal output circuit and pressure detecting signal output circuit are respectively equipped with short-circuit protection circuit; Two short-circuit protection circuits are distinguished the electric current of the output signal of collecting temperature, pressure detecting signal output circuit, and the output terminal of two short-circuit protection circuits connects MCU.
9, pressure-temperature sensor according to claim 1 is characterized in that structure division comprises probe and main body; Circuit part is installed thermistor in main body; One end of probe is connected with main body, and thermistor and pressure transducer are located in the other end of probe; Fill heat conductor around the thermistor; Pressure transducer is pressed close in the installation site of thermistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200393886U CN201285331Y (en) | 2008-09-03 | 2008-09-03 | Pressure temperature sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200393886U CN201285331Y (en) | 2008-09-03 | 2008-09-03 | Pressure temperature sensor |
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| CN201285331Y true CN201285331Y (en) | 2009-08-05 |
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| CNU2008200393886U Expired - Fee Related CN201285331Y (en) | 2008-09-03 | 2008-09-03 | Pressure temperature sensor |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102818651A (en) * | 2012-07-31 | 2012-12-12 | 广东威创视讯科技股份有限公司 | Detection method and detection circuit of LED (Light Emitting Diode) light source temperature |
| CN103759879A (en) * | 2014-01-09 | 2014-04-30 | 渤海大学 | Vacuole pressure data acquisition device of high-speed underwater navigation body |
| CN109564139A (en) * | 2016-08-05 | 2019-04-02 | 株式会社电装 | Sensor device |
| CN110077746A (en) * | 2019-04-29 | 2019-08-02 | 中国长城葡萄酒有限公司 | Wet tank pressurizer and method |
| CN110857898A (en) * | 2018-08-22 | 2020-03-03 | 精量电子（深圳）有限公司 | Oil-filled pressure sensor |
-
2008
- 2008-09-03 CN CNU2008200393886U patent/CN201285331Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102818651A (en) * | 2012-07-31 | 2012-12-12 | 广东威创视讯科技股份有限公司 | Detection method and detection circuit of LED (Light Emitting Diode) light source temperature |
| CN102818651B (en) * | 2012-07-31 | 2014-07-02 | 广东威创视讯科技股份有限公司 | Detection method and detection circuit of LED (Light Emitting Diode) light source temperature |
| CN103759879A (en) * | 2014-01-09 | 2014-04-30 | 渤海大学 | Vacuole pressure data acquisition device of high-speed underwater navigation body |
| CN109564139A (en) * | 2016-08-05 | 2019-04-02 | 株式会社电装 | Sensor device |
| CN109564139B (en) * | 2016-08-05 | 2021-02-05 | 株式会社电装 | Sensor device |
| CN110857898A (en) * | 2018-08-22 | 2020-03-03 | 精量电子（深圳）有限公司 | Oil-filled pressure sensor |
| CN110077746A (en) * | 2019-04-29 | 2019-08-02 | 中国长城葡萄酒有限公司 | Wet tank pressurizer and method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090805 Termination date: 20110903 |