CN101113934A - Intelligent capacitance differential pressure cell and method - Google Patents
Intelligent capacitance differential pressure cell and method Download PDFInfo
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- CN101113934A CN101113934A CNA2007100583753A CN200710058375A CN101113934A CN 101113934 A CN101113934 A CN 101113934A CN A2007100583753 A CNA2007100583753 A CN A2007100583753A CN 200710058375 A CN200710058375 A CN 200710058375A CN 101113934 A CN101113934 A CN 101113934A
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Abstract
The invention relates to an equipment or an instrument used for measuring two or a plurality of pressure differences, in particular to an intelligent capacitance pressure difference transmitter and the method. The invention aims at solving the problems that the existing intelligent capacitance pressure transmitter oscillator is provided with a plurality of discrete components, the circuit requires highly of the components in regard of their temperature characteristic and accuracy and high anti-interference ability and the procurement testing and the debugging are difficult. The technic proposal comprises a T-shaped tubular shell which forms an outer shell, pressure-sensitive elements and temperature sensors arranged in perpendicular between the joints of high pressure pipelines and low pressure pipelines, a sensitive element measuring circuit connected with the output terminals of the sensitive elements, a microprocessor unit connected with the output terminal of the sensitive element measuring circuit, a D/A converting circuit and a digital communication circuit connected with the output terminal of the microprocessor unit, a 4-20 mA power circuit connected with the output terminal of the D/A converting circuit, a display module and key unit connected with the microprocessor unit. The invention has the advantages of high circuit integration level, good temperature stability, simplification of debugging, strong anti-interference and high precision.
Description
Technical field
The present invention relates to measure the equipment or the instrument of two or more pressure difference values, particularly a kind of intelligent capacitance differential pressure cell and method that is applied to industries such as oil, chemical industry, metallurgy, environmental protection.
Background technology
Differential pressure transmitter is to detect, transmit, show, pilot-gas, liquid, the device of acting force between materials such as solid, the production link that it converts pressure signal to electric signal and is used to measure automatically and controls automatically, force balance type is generally arranged, condenser type, strain-type, piezoelectric type, pressure resistance type etc., compare with force balance type, condenser type does not have gear train, compact dimensions, good anti-vibration, the precision height, zeroing and accent range do not disturb mutually, recently obtained to use widely, at present China Xi'an, Beijing has all produced and has comprised pressure, differential pressure, absolute pressure, the kind and the head pressures such as differential pressure transmitter of band evolution, specification products such as high static pressure.
Its theory diagram of intelligent differential pressure transmitter of existing band HART bus as shown in Figure 2, its structure is by T shape shell; Be installed in the lower vertical shell of T shape shell, the sensitive element 10 that the two sides is connected with high and low pressure pipe fitting interface (as Fig. 1. shown in two cell structure capacitance differential pressure transducers); Be installed in the lower vertical shell of T shape shell, by oscillator ZH, detuner JT, oscillating controller ZK, the oscillating circuit board unit 5 that the I/V converter is formed; Be installed in the upper level shell of T shape shell, by microprocessor MP (MSP430F427), digital communication ST (chip HT2012PL and peripheral circuit), D/A conversion of signals (AD421), the transmitter main circuit board unit 4 that power unit is formed and by display module, the display module circuit board unit 3 that button is formed constitutes.
As shown in Figure 1, 2, sensitive element has three lead-in wire (high-voltage capacitance pole plates, low-voltage capacitance pole plate lead-in wire, with public pole plate lead-in wire), high-voltage capacitance pole plate wherein, low-voltage capacitance pole plate lead-in wire is directly connected to the end of balancing capacitance C1, C2 in the detuner, and its public pole plate lead-in wire ground connection is also passed through capacitor C
0Receive power supply V
+End.
With sensitive element 10 be arranged in the housing temperature sensor 12 output be transferred to A/D analog to digital conversion input interface 6 pin of microprocessor MP by oscillating circuit board unit 5.Triode B and transformer coil L4, L5, resistance R, it is the oscillator of 32KHz that capacitor C constitutes oscillation frequency, oscillator is by transformer coil L1, L2, L3 is coupled to detuner, detuner is by the principle of rectification, to flow through the electric current of the high-voltage capacitance in the sensitive element, the electric current of low-voltage capacitance carries out vector addition at coil L2, the current signal that addition draws is received amplifier input end TLC2254 chip 2 pin in the I/V converter by line, signal is through the I/V converter, convert differential voltage signal S+ to, S-, and be wired to analog-digital conversion a/ d input interface 2,3 pin of MP in the main circuit board unit, oscillating controller makes its amplitude stability by the triode B emitter coil that feedback operational amplifier K exports oscillator to.
Microprocessor unit is gathered the voltage signal and the temperature sensor signal of the output of oscillating circuit board unit by the analog to digital conversion interface, and the voltage signal of gathering is carried out the digital filtering processing and carries out compensation for calibrating errors according to environment temperature by specific rule.Operation result is delivered to the data-interface 7 of D/A chip by general purpose I/O IO interface 51,52,53 pin, and clock interface 6 and sheet select interface 5, and the result that the D/A chip will be accepted is converted to electric current output.
From the amplifier input interface that connects the digital communication filtering circuit on the 4mA-20mA loop with the digital signal of HART compatibility by lead-in wire, connect restituted signal input interface 4 pin of HT2012PL chip in the digital communication after the filtering, transport to the MP serial ports through serial ports output interface 14 pin of HT2012PL chip after the demodulation and import 59 pin.MP imports 27 pin to the serial ports that its response signal is delivered to the HT2012PL in the digital communication through modulation by serial ports output interface 60 pin of MP, delivers to the 4mA-20mA loop through 16 pin of HT2012PL after the modulation and system controller carries out digital communication.
MP is by universal input/output interface I/O 11,44,45 in the transmitter main circuit board unit, 46,47 be connected with button by the control interface in the display module unit, control the information that it shows force value and menu information and other units, and cooperate button that transmitter is carried out range, zero point, full journey, damping, unit, display mode, settings such as display precision.
But, there is following problems in existing capacitance differential pressure cell: A. circuit complexity, the oscillating circuit board unit that is made of oscillator, oscillating controller, detuner, I/V converter just need tens discrete components, cause that welding is complicated, volume is big, antijamming capability and reliability are relatively poor.B. the easy temperature influence job insecurity of the capacitor charge and discharge in its sensitive element.C. circuit is higher to the temperature profile and the accuracy requirement of element, has increased the workload of buying, incoming inspection.D. circuit debugging is relatively more difficult.E. the 32KHZ high frequency that existing oscillator uses is bigger to influence circuit, therefore makes circuit antijamming capability, PCB layout require to improve.F. existing its main circuit board of transmitter and display module circuit board are formed with the spiral shell public affairs with an end, in addition the end double-screw bolt lamination that is formed with screw is bolted in the dividing plate screw in the horizontal shell of transmitter, circuit is directly pegged graft with plug, the socket of the connector that is fixed in main circuit board and display module circuit board on it, when plug, socket relative position install unpunctual, often make plug, the bad grafting of socket or the back loose contact of pegging graft, in addition, this rigid grafting also is not easy to display module circuit board and main circuit board and pulls out and carry out whole detection and debugging.
Summary of the invention
The present invention proposes, disclose a kind of circuit structure of measuring capacitor discharge time that utilizes and measure sensitive element voltage variation capacitance value for solving the above-mentioned problems in the prior art, and then measures pressure difference and control production automatically automatically.
Technical scheme of the present invention includes: form appearance, the T shape shell of transmitter parts is installed; Be bolted in the display window lid of horizontal shell one end; Be bolted in the horizontal shell end cap of end in addition; Be installed on the pressure-sensing device and the temperature sensor of the vertical shell between the high and low pressure pipe interface; Be bolted in the circular main circuit board and the display module circuit board of horizontal shell internal partition screw with double-screw bolt, screw lamination; It is characterized in that: the sensitive element metering circuit that is connected in sensitive element output is installed on the main circuit board; Be connected in the microprocessor unit of sensitive element metering circuit output; Be connected in the D/A change-over circuit of microprocessor unit output; The digital communication circuit; Be connected in 4-20mA power circuit, the digital communication circuit of the output of D/A change-over circuit, be equipped with on its display module circuit board: be connected in the display module of microprocessor unit and adjust push-button unit.
Its sensitive element metering circuit is by two Room capacitance differential pressure sensitive elements, two standard capacitances, charging resistor, Schmidt trigger, discharge resistance and PS Φ 21 capacitance measurement chips constitute, the high-voltage capacitance pole plate of sensitive element and low-voltage capacitance pole plate lead-in wire are connected to capacitance measurement chip SG-A1 and SG-D1 interface and pass through chip internal gauge tap ground connection, high, the public pole plate of low-voltage capacitance lead-in wire is connected to the junction of charging resistor and discharge resistance and through discharge resistance ground connection, the SG-B1 that one utmost point lead-in wire of two standard capacitances respectively is connected to capacitance measurement chip PS Φ 21 also is connected with ground by its internal control switch with the SG-C1 interface, another utmost point lead-in wire of two standard capacitances is connected to the junction of charging resistor and discharge resistance equally, but charging resistor one is terminated at capacitance measurement chip controlled charging DC voltage output interface, termination discharge resistance one end in addition, discharge resistance is held ground connection in addition.The input that is used for the Schmidt trigger of each capacitor discharge timing control is connected to the charge and discharge resistance joint, its output connects the input interface of capacitance measurement chip and controls timing, and the capacitance measurement chip is provided over the ground 5V voltage and connect microprocessing unit I/O interface by serial line interface SPI by power supply.
The function of capacitance measurement chip is: the signal of accepting Schmidt trigger, measure the time of capacitor discharge to fixed voltage value, TDC time figure amount converting unit in the capacitance measurement chip, calculate electric capacity ground discharge time, the Sequencer program-controlled unit of capacitance measurement chip is controlled its inner and the field effect transistor of each capacitances in series and break-make on ground, clock control makes clock circuit produce accurate timing, MP is by the course of work that the capacitance measurement chip is set with writing register in the capacitance measurement chip, MP reads capacitance measurement chip ground measurement data by the read register in the capacitance measurement chip, and its block diagram is seen Fig. 5.
Its microprocessing unit adopts the MSP430F427 chip, it is by I/O interface 11,44,48, the serial output interface SPI of 61 pin and capacitance measurement chip is connected, be connected in sensitive element by its A/D interface 6 and be arranged at temperature sensor output terminal in the same housing, calibrate recording capacitance, and with result of calculation by its I/O interface 51,52,53 are transferred to the data-interface 7 of D/A chip, clock stops interface 6, sheet selects interface 5, the D/A chip is converted to electric current output with reception, and microprocessing unit is by its I/O interface 11 in addition, 44,45,46,47, with plug, socket reaches therebetween, and winding displacement is connected with button adjustment unit control interface with display module.
It is connected to the amplifier input interface of the filtering circuit of digital communication by lead-in wire from the digital signal of 4-20mA loop and HART compatibility, connect the demodulation input interface 4 of HT2012PL chip in the digital communication after the filtering, demodulation is after its serial ports output 14 is connected to microprocessing unit input interface 59, microprocessor is transported to the serial ports input interface 27 of HZ2012PL through modulation by the serial ports output interface 60 of MP with its response signal, and modulation is after HZ2012PL send 4-20mA loop and system controller to carry out digital communication.The functional sequence of its microprocessor as shown in Figure 6.
Its main circuit board and display module circuit board that microprocessor, digital communication, D/A conversion of signals, power unit are installed is formed with the spiral shell public affairs with an end, hold the double-screw bolt lamination that is formed with screw to be bolted in the horizontal shell internal partition screw of transmitter in addition, circuit connects with plug, socket and winding displacement connection therebetween on it.
Its intelligent capacitance differential pressure cell delivering method includes: the initial phase of differential pressure transmitter; Whether have and interrupt measuring the judgement stage with adjusting; If not, then to carry out differential pressure measurement be self-capacitance measured chip image data, carry out digital filtering, data processing, D/A conversion of signals, simulating signal output, display module output stage; If carry out then whether the stage is judged on keyboard interrupt ground; Judged result is if then can carry out zero point, full journey, unit selection, display mode, damping and report to the police all stages that is provided with; If not, carry out then whether the stage is judged on communicating interrupt ground; Judged result if, then can carry out factory calibration, zero point, full journey, unit selection, display mode, damping report to the police all settings and fine position, reset, the way of output is provided with the stage; If not or the stage that is provided with finish, then return the transmitter initialization after, whether have and interrupt to measure between the ground judgement stage.
Advantage and good effect: A. the present invention has adopted the method for measuring capacitor discharge time to measure pressure difference, has therefore cancelled oscillatory circuit, has reduced by tens discrete components, has reduced transmitter volume and welding job amount, and the circuit antijamming capability is improved.B. circuit has been cancelled temperature and the higher element of accuracy requirement, has reduced buying, incoming inspection workload.C. circuit integration improves, and debugging is simplified, precision improves.D. the oscillator cancellation improves antijamming capability, and properties of product are stable.E. main circuit board of the present invention be connected with the circuit of display module circuit board the plug used instead with connector, socket and therebetween winding displacement ground be flexible coupling, reduced plug, socket fixedly difficulty of matching, facility assembling, detection and debugging.
Description of drawings
Fig. 1 is existing two cell structure capacitance differential pressure transducer principle assumption diagrams;
Fig. 2 is existing intelligent capacitance differential pressure cell circuit and functional block diagram;
Fig. 3 is intelligent capacitance differential pressure cell circuit of the present invention and functional block diagram
Fig. 4 is intelligent capacitance differential pressure cell STRUCTURE DECOMPOSITION figure of the present invention;
Fig. 5 is an intelligent capacitance differential pressure cell capacitance detecting chip functions block diagram of the present invention;
Fig. 6 is an intelligent capacitance differential pressure cell delivering method process flow diagram of the present invention;
Fig. 7 installs and the direct plugboard chart of circuit connector for double-screw bolt between existing intelligent capacitance differential pressure cell main circuit board and display module circuit board;
Fig. 8 installs for double-screw bolt between intelligent capacitance differential pressure cell main circuit board of the present invention and display module circuit board and circuit connector reaches winding displacement connection layout therebetween;
Fig. 9 installs front elevation with double-screw bolt for intelligent capacitance differential pressure cell main circuit board of the present invention and display module circuit board;
Figure 10 is connected sectional view for intelligent capacitance differential pressure cell main circuit board of the present invention and display module circuit board with double-screw bolt installation and circuit connector, winding displacement;
Figure 11 is that main circuit board and display module circuit board are installed double-screw bolt figure.
Each major label description in figure:
1. display window covers 2. O-ring seals
3. display module circuit board, display module circuit board unit 4. main circuit boards
5. oscillating circuit board, oscillating circuit board unit 6.T shape shell
6 ' horizontal shell 6 " vertical shell
7. screw 8. end caps
9. low pressure line interface 10. sensitive elements
11. pressure duct interface 12. temperature sensors
13. double-screw bolt 14. connectors
15. winding displacement 16. screws.
17. wiring hole I/O-IO interface
ZH-oscillator ZK-oscillating controller
JT-detuner I/V-current-to-voltage convertor
MP-microprocessor unit C1, C2-balancing capacitance
AN-button ST-digital communication
A/D-analog to digital conversion D/A-digital-to-analog conversion
Cmf-standard capacitance R
c-charging resistor
SH-Schmidt trigger R
f-discharge resistance
Embodiment 5 ' sensitive element metering circuit
In order to further specify content of the present invention, technical scheme, characteristics and functional effect, again with following example and accompanying drawings in down: as Fig. 3-6,8-10, shown in, the technical scheme of intelligent capacitance differential pressure cell of the present invention includes: form appearance, the T shape shell 6 of transmitter parts is installed; Be bolted in the display window lid 1 of horizontal shell 6 ' one ends; Be bolted in the horizontal shell end cap 8 of end in addition; Be installed on the vertical shell 6 of 11,9 of high and low pressure pipe interfaces " in pressure-sensing device 10 and temperature sensor 12; Be bolted in the circular main circuit board 4 and the display module circuit board 3 of horizontal shell internal partition screw 16 with double-screw bolt 13, screw 7 laminations; It is characterized in that: be equipped with on the main circuit board sensitive element metering circuit 5 that is connected in sensitive element output '; Be connected in the microprocessor unit MP of sensitive element metering circuit output; Be connected in the D/A change-over circuit of microprocessor unit output; Digital communication circuit ST; Be connected in 4-20mA power circuit, the digital communication circuit of the output of D/A change-over circuit; Be equipped with on its display module circuit board 3: be connected in the display module of microprocessor unit MP and adjust button AN unit.
Its sensitive element metering circuit 5 ' by two Room capacitance differential pressure sensitive elements 10, two standard capacitance Cmf, charging resistor R
c, Schmidt trigger SH, discharge resistance R
fAnd PS Φ 21 capacitance measurement chips constitute, the high-voltage capacitance pole plate of sensitive element and low-voltage capacitance pole plate lead-in wire are connected to capacitance measurement chip SG-A1 and SG-D1 interface and pass through chip internal gauge tap ground connection, high, the public pole plate of low-voltage capacitance lead-in wire is connected to the junction of charging resistor and discharge resistance and through discharge resistance ground connection, the SG-B1 that one utmost point lead-in wire of two standard capacitances respectively is connected to capacitance measurement chip PS Φ 21 also is connected with ground by its internal control switch with the SG-C1 interface, another utmost point lead-in wire of two standard capacitances is connected to the junction of charging resistor and discharge resistance equally, but charging resistor one is terminated at capacitance measurement chip controlled charging DC voltage output interface, termination discharge resistance one end in addition, discharge resistance is held ground connection in addition.The input that is used for the Schmidt trigger of each capacitor discharge timing control is connected to the charge and discharge resistance joint, its output connects the input interface of capacitance measurement chip and controls timing, and the capacitance measurement chip is provided over the ground 5V voltage and connect microprocessing unit I/O interface by serial line interface SPI by power supply.
The function of capacitance measurement chip PS Φ 21 is: the signal of accepting Schmidt trigger, measure the time of capacitor discharge to fixed voltage value, TDC time figure amount converting unit in the capacitance measurement chip, calculate electric capacity ground discharge time, the Sequencer program-controlled unit of capacitance measurement chip is controlled its inner and the field effect transistor of each capacitances in series and break-make on ground, clock control makes clock circuit produce accurate timing, MP is by the course of work that the capacitance measurement chip is set with writing register in the capacitance measurement chip, MP reads capacitance measurement chip ground measurement data by the read register in the capacitance measurement chip, and its block diagram is seen Fig. 5.
Its microprocessing unit MP adopts the MSP430F427 chip, it is by I/O interface 11,44,48, the serial output interface SPI of 61 pin and capacitance measurement chip is connected, be connected in sensitive element by its A/D interface 6 and be arranged at temperature sensor output terminal in the same housing, calibrate recording capacitance, and with result of calculation by its I/O interface 51,52,53 are transferred to the data-interface 7 of D/A chip, clock stops interface 6, sheet selects interface 5, the D/A chip is converted to electric current output with reception, and microprocessing unit is by its I/O interface 11 in addition, 44,45,46,47, plug with connector 14, socket reaches therebetween, and winding displacement 15 is connected with button AN adjustment unit control interface with display module.
It is connected to the amplifier input interface of the filtering circuit of digital communication ST by lead-in wire from the digital signal of 4-20mA loop and HART compatibility, connect the demodulation input interface 4 of HT2012PL chip in the digital communication after the filtering, demodulation is after its serial ports output 14 is connected to microprocessing unit input interface 59, microprocessor is transported to the serial ports input interface 27 of HZ2012PL through modulation by the serial ports output interface 60 of MP with its response signal, and modulation is after HZ2012PL send 4-20mA loop and system controller to carry out digital communication.
Its main circuit board 4 and display module circuit board 3 that microprocessor, digital communication, D/A conversion of signals, power unit are installed is formed with the spiral shell public affairs with an end, in addition end double-screw bolt 13 laminations that are formed with screw are bolted in the screw 16 of horizontal shell internal partition of transmitter, and circuit connects with connector 14 and winding displacement 15 connections therebetween it on.
Its intelligent capacitance differential pressure cell delivering method includes: the initial phase of differential pressure transmitter; Whether have and interrupt measuring the judgement stage with adjusting; If not, then to carry out differential pressure measurement be self-capacitance measured chip image data, carry out digital filtering, data processing, D/A conversion of signals, simulating signal output, display module output stage; If carry out then whether the stage is judged on keyboard interrupt ground; Judged result is if then can carry out zero point, full journey, unit selection, display mode, damping and report to the police the stage is set; If not, carry out then whether the stage is judged on communicating interrupt ground; Judged result is if then can carry out factory calibration, zero point, full journey, unit selection, display mode, damping warning setting and fine position, reset, the way of output is provided with the stage; If not or the stage that is provided with finish, then return the transmitter initialization after, whether have and interrupt to measure between the ground judgement stage.
Claims (5)
1. an intelligent capacitance differential pressure cell includes: form appearance, the T shape shell of transmitter parts is installed; Be bolted in the display window lid of horizontal shell one end; Be bolted in the horizontal shell end cap of end in addition; Be installed on pressure-sensing device and temperature sensor in the vertical shell between the high and low pressure pipe interface; Be bolted in the circular main circuit board and the display module circuit board of horizontal shell internal partition screw with double-screw bolt, screw lamination; It is characterized in that: the sensitive element metering circuit that is connected in sensitive element output is installed on the main circuit board; Be connected in the microprocessor unit of sensitive element metering circuit output; Be connected in the D/A change-over circuit of microprocessor unit output; The digital communication circuit; Be connected in 4-20mA power circuit, the digital communication circuit of the output of D/A change-over circuit, be equipped with on its display module circuit board: be connected in the display module of microprocessor unit and adjust push-button unit.
2. intelligent capacitance differential pressure cell according to claim 1, it is characterized in that: its sensitive element metering circuit is by two Room capacitance differential pressure sensitive elements, two standard capacitances, charging resistor, Schmidt trigger, discharge resistance and PS Φ 21 capacitance measurement chips constitute, the high-voltage capacitance pole plate of sensitive element and low-voltage capacitance pole plate lead-in wire are connected to capacitance measurement chip SG-A1 and SG-D1 interface and pass through chip internal gauge tap ground connection, high, the public pole plate of low-voltage capacitance lead-in wire is connected to the junction of charging resistor and discharge resistance and through discharge resistance ground connection, the SG-B1 that one utmost point lead-in wire of two standard capacitances respectively is connected to capacitance measurement chip PS Φ 21 also is connected with ground by its internal control switch with the SG-C1 interface, another utmost point lead-in wire of two standard capacitances is connected to the junction of charging resistor and discharge resistance equally, but charging resistor one is terminated at capacitance measurement chip controlled charging DC voltage output interface, termination discharge resistance one end in addition, discharge resistance is held ground connection in addition.The input that is used for the Schmidt trigger of each capacitor discharge timing control is connected to the charge and discharge resistance joint, its output connects the input interface of capacitance measurement chip and controls timing, and the capacitance measurement chip is provided over the ground 5V voltage and connect microprocessing unit I/O interface by serial line interface SPI by power supply.
3. intelligent capacitance differential pressure cell according to claim 1, it is characterized in that: its microprocessing unit adopts the MSP430F427 chip, it is by I/O interface 11,44,48, the serial output interface SPI of 61 pin and capacitance measurement chip is connected, be connected in sensitive element by its A/D interface and be arranged at temperature sensor output terminal in the same housing, calibrate recording capacitance, and with result of calculation by its I/O interface 51,52,53 are transferred to the data-interface 7 of D/A chip, clock stops interface 6, sheet selects interface 5, the D/A chip is converted to electric current output with reception, and microprocessing unit is by its I/O interface 11 in addition, 44,45,46,47, with plug, socket reaches therebetween, and winding displacement is connected with button adjustment unit control interface with display module.
4. intelligent capacitance differential pressure cell according to claim 1, it is characterized in that: it is connected to the amplifier input interface of the filtering circuit of digital communication by lead-in wire from the digital signal of 4-20mA loop and HART compatibility, connect the demodulation input interface 4 of the HT2012PL chip of digital communication after the filtering, demodulation is after its serial ports output 14 is connected to microprocessing unit input interface 59, microprocessor is transported to the serial ports input interface 27 of HZ2012PL through modulation by the serial ports output interface 60 of MP with its response signal, and modulation is after HZ2012PL send 4-20mA loop and system controller to carry out digital communication.
5. intelligent capacitance differential pressure cell delivering method, it is characterized in that: it includes: the initial phase of differential pressure transmitter; Whether have and interrupt measuring the judgement stage with adjusting; If not, then to carry out differential pressure measurement be self-capacitance measured chip image data, carry out digital filtering, data processing, D/A conversion of signals, simulating signal output, display module output stage; If carry out then whether the stage is judged on keyboard interrupt ground; Judged result is if then can carry out zero point, full journey, unit selection, display mode, damping and report to the police all stages that is provided with; If not, carry out then whether the stage is judged on communicating interrupt ground; Judged result if, then can carry out factory calibration, zero point, full journey, unit selection, display mode, damping report to the police all settings and fine position, reset, the way of output is provided with the stage; If not or the stage that is provided with finish, then return the transmitter initialization after, whether have and interrupt to measure between the ground judgement stage.
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| CNA2007100583753A CN101113934A (en) | 2007-07-24 | 2007-07-24 | Intelligent capacitance differential pressure cell and method |
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| CNA2007100583753A CN101113934A (en) | 2007-07-24 | 2007-07-24 | Intelligent capacitance differential pressure cell and method |
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| CN102288356A (en) * | 2011-07-26 | 2011-12-21 | 河北大学 | Device for quantitatively detecting interphase applied force of gas-liquid two-phase flow |
| CN103576643A (en) * | 2012-08-10 | 2014-02-12 | Ls产电株式会社 | HART analog input module with differential input stage |
| CN105136008A (en) * | 2015-07-24 | 2015-12-09 | 太原理工大学 | Strip steel offset detection apparatus |
| CN105606848A (en) * | 2015-08-18 | 2016-05-25 | 浙江中烟工业有限责任公司 | Online detection method for differential pressure transmitting unit of anemometer |
| CN105973197A (en) * | 2016-07-22 | 2016-09-28 | 西安华恒仪表制造有限公司 | Liquid level static force level gauge |
| CN106384498A (en) * | 2016-11-18 | 2017-02-08 | 广州精秀热工设备有限公司 | Transmitter for converting dichlorodifluoromethane saturation pressure into saturation temperature |
| CN107532963A (en) * | 2015-06-02 | 2018-01-02 | 巴尔克株式会社 | Measuring apparatus with output signal adjustment function |
| CN108645556A (en) * | 2018-08-12 | 2018-10-12 | 西南大学 | A kind of tractor resistance detection device |
| CN110146215A (en) * | 2019-05-19 | 2019-08-20 | 瑞立集团瑞安汽车零部件有限公司 | A kind of baroceptor with temperature-compensating Yu parameter tuning measure |
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| CN111122019A (en) * | 2019-12-31 | 2020-05-08 | 中国科学院微电子研究所 | Capacitive pressure detection device and method based on voltage-time conversion and sensor |
| CN113465813A (en) * | 2021-07-30 | 2021-10-01 | 沈阳中科博微科技股份有限公司 | Capacitive differential pressure transmitter with pressure leading pipe blockage self-diagnosis function |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102288356A (en) * | 2011-07-26 | 2011-12-21 | 河北大学 | Device for quantitatively detecting interphase applied force of gas-liquid two-phase flow |
| CN103576643A (en) * | 2012-08-10 | 2014-02-12 | Ls产电株式会社 | HART analog input module with differential input stage |
| US9178967B2 (en) | 2012-08-10 | 2015-11-03 | Lsis Co., Ltd. | HART analog input module with differential input stage |
| CN103576643B (en) * | 2012-08-10 | 2016-12-28 | Ls产电株式会社 | There is the HART Analog input mModule of differential input level |
| CN107532963A (en) * | 2015-06-02 | 2018-01-02 | 巴尔克株式会社 | Measuring apparatus with output signal adjustment function |
| CN105136008A (en) * | 2015-07-24 | 2015-12-09 | 太原理工大学 | Strip steel offset detection apparatus |
| CN105136008B (en) * | 2015-07-24 | 2018-01-09 | 太原理工大学 | A kind of strip offset detecting device |
| CN105606848A (en) * | 2015-08-18 | 2016-05-25 | 浙江中烟工业有限责任公司 | Online detection method for differential pressure transmitting unit of anemometer |
| CN105973197A (en) * | 2016-07-22 | 2016-09-28 | 西安华恒仪表制造有限公司 | Liquid level static force level gauge |
| CN106384498A (en) * | 2016-11-18 | 2017-02-08 | 广州精秀热工设备有限公司 | Transmitter for converting dichlorodifluoromethane saturation pressure into saturation temperature |
| CN108645556A (en) * | 2018-08-12 | 2018-10-12 | 西南大学 | A kind of tractor resistance detection device |
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| CN110146215B (en) * | 2019-05-19 | 2021-02-26 | 瑞立集团瑞安汽车零部件有限公司 | Air pressure sensor with temperature compensation and parameter setting measures |
| CN110319971A (en) * | 2019-08-02 | 2019-10-11 | 上海振太仪表有限公司 | A kind of bipolar condenser type vacuum meter and its corresponding measuring circuit |
| CN110319971B (en) * | 2019-08-02 | 2024-04-23 | 上海振太仪表有限公司 | Measuring circuit for measuring pressure in bipolar capacitance type vacuum gauge |
| CN111122019A (en) * | 2019-12-31 | 2020-05-08 | 中国科学院微电子研究所 | Capacitive pressure detection device and method based on voltage-time conversion and sensor |
| CN113465813A (en) * | 2021-07-30 | 2021-10-01 | 沈阳中科博微科技股份有限公司 | Capacitive differential pressure transmitter with pressure leading pipe blockage self-diagnosis function |
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