CN200986475Y

CN200986475Y - Intelligent electronic pressure transmitter

Info

Publication number: CN200986475Y
Application number: CN 200620109083
Authority: CN
Inventors: 狄兆剑
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-10-30
Filing date: 2006-10-30
Publication date: 2007-12-05
Anticipated expiration: 2016-10-30

Abstract

The utility model discloses an intelligent electric pressure transmitter, which includes at least one pressure element. The pressure element is connected with a signal processing chip or a signal conditioning chip through a pressure sensor, and is driven by the chip to output digital or analogue voltage, current or PWM signals. The chip is connected with a PC. The signal processing chip or signal conditioning chip is also connected with a LCD and an upper and lower limit alarm output and provided with parameter configuration buttons. The signal processing chip is a ZMD-series or MAX1426 chip, which is connected with a Senstronics sputtering thin film pressure sensor or a silicon pressure sensor through a pressure and temperature sensor. The signal processing chip is also connected with the PC through a port, and is driven by an amplifying triode and a resistance to output current signal or output digital signal through the port. The utility model is characterized in reasonable and compact structure, convenient and reliable use, high operation stability, extremely small volume, extremely weight, high precision and extremely high blast-resistance, shock-resistance and corrosion-resistance.

Description

The smart electronics pressure unit

Technical field

The utility model relates to a kind of intelligent electron pressure and become and send device, belong to pressure survey, control and pressure data teletransmission technical field automatically.

Background technology

Present known pressure unit and telemetering type pressure unit are to be used as pressure sensing by mechanical parts, intermediary's liquid, condenser type, handle by signal imitation again, carry out to become and send or teletransmission, the fatiguability that mechanical parts brought known to above-mentioned, low precision, life-span are short, intermediary's liquid and condenser type temperature influence seriously and wild effect such as non-linear, therefore directly influence pressure precision, can be along variation of temperature producing and raise or reduce, problems such as add that the limitation of complexity of circuit, non-linear effect are undesirable, function singleness, complex circuit, power consumption are big.

Summary of the invention

The purpose of this utility model is to overcome the deficiency of existing transmitter, a kind of smart electronics pressure unit is provided, it has not only overcome the whole issue of existing transmitter, and can with compunication, output can also have two digital output channels with aanalogvoltage, electric current, PWM, simultaneously can be to low alarm limit, high alarm setting, the output of programming when pursuing of reporting to the police has temperature output simultaneously in pressure output.

The purpose of this utility model is finished by following technical solution, it includes a pressure elements at least, this pressure elements links to each other with a signal processing chip or signal condition chip through a pressure transducer, drive output numeral, aanalogvoltage, electric current, pwm signal by it, and this chip links to each other with microcomputer.

Described signal processing chip or signal condition chip also are connected to the output of reporting to the police of LCD display and bound, and dispose parameter button is set.

Described signal processing chip adopts ZMD series or MAX1426 chip, it links to each other by pressure and this special sputtered film formula pressure elements of a temperature sensor and a victory or Silicon pressure sensitive element, and signal processing chip links to each other with microcomputer by port, and drives output current signal or export digital signal by port by amplifying triode and resistance.

Described signal condition chip adopts the FS98 family chip as FS9821, FS9822, FS9824, it links to each other by pressure and this special sputtered film formula pressure elements of a temperature sensor and a victory or Silicon pressure sensitive element, and the signal condition chip configuration has storage external, at least there is the electrorheological of 4-20MA to send output by port, and links to each other with microcomputer by port.

Described pressure elements or Silicon pressure sensitive element are welded on the stainless steel L316 pedestal, and this pedestal is provided with the pressure connecting thread that is connected with tested pressure source, and its top is provided with the excitation power supply of pressure elements, pressure signal and temperature signal output terminal.

Because of adopting, the present invention wins this special sputtered film formula principle, there are not any mechanical movable part and intermediary's liquid and alite paste, electronic circuit partly adopts high precision monolithic pressure conditioning chip ZMD3 series or MXA1426 and FS9821/22/24 series, demonstrated fully stability of the present invention, its comprehensive measured precision is up to 0.01%, working temperature reaches-70 ℃-300 ℃, thermal sensitivity drift is less than 0.005%FS ℃, its simple in circuits, few peripheral cell, its volume and weight can be accomplished minimum and extremely light, and the fitting pedestal adopts stainless steel L316, and is explosion-proof, antidetonation, corrosion resistivity is extremely strong.

Description of drawings

Fig. 1 is a structural principle block scheme of the present utility model.

Fig. 2 is a kind of circuit theory diagrams of the present utility model.

Fig. 3 is another kind of circuit theory diagrams of the present utility model.

Pressure of the present utility model and temperature sensing structure synoptic diagram during Fig. 4.

Embodiment

Below in conjunction with accompanying drawing the utility model is described in detail: shown in Figure 1, the utility model includes a pressure elements 101 at least, this pressure elements 101 links to each other with a signal processing chip 103 or signal condition chip through a pressure transducer 102, drive output numeral, aanalogvoltage, electric current, pwm signal 104 by it, and this chip 103 links to each other with microcomputer 105.Described signal processing chip or signal condition chip also are connected to the output 107 of reporting to the police of LCD display 106 and bound, and dispose parameter button 108 is set, and mu balanced circuit 109 is arranged; 110 is storage external EEPROM among the figure.

Shown in Figure 2, described signal processing chip 201 adopts ZMD series or MAX1426 chip, it links to each other by pressure and this special sputtered film formula pressure elements 101 of a temperature sensor 102 and a victory or Silicon pressure sensitive element, and signal processing chip 201 links to each other with microcomputer by port 209,210, and drives output current signals or export digital signals by port 209 by amplifying triode 203 and resistance 204,205.In the accompanying drawing, 207 is pressure and temperature sensor, pressure signal and temperature signal are directly sent into monolithic conditioning chip 201, be that it selects ZMD31 series or MAX1426 series etc. for use, microcomputer by 209 or 210 ports to its calibrate, conditioning, temperature mend taste, operation such as non-linear finishing, by triode 203, as BC548; Resistance 204, desirable 120 Ω; Resistance 205, value 50 Ω drive to become and send output 4-20mA, also can carry out numeral by 209 ports and export, and 202 is the miniwatt field effect transistor, and as J113 etc., 206 is CBB electric capacity value 0.1uF.

Shown in Figure 3, the FS98 family chip that described signal condition chip 302 adopts as FS9821, FS9822, FS9824, it links to each other by pressure and this special sputtered film formula pressure elements of a temperature sensor and a victory or Silicon pressure sensitive element 404, and signal condition chip 302 disposes storage external 303, at least there is the electrorheological of 4-20MA to send output by port 316, and links to each other with microcomputer by port 322.Shown in the accompanying drawing, 301 is pressure and temperature sensor; 302 are monolithic pressure conditioning chip, i.e. FS98 series is as FS9821, FS9822, FS9824 etc.; 303 is storage external EEPROM, i.e. 24C08; 304,305,306,307,308,309,310,311 is resistance, gets 90K Ω, 10K Ω, 10K Ω, 90K Ω, 300K Ω, 10K Ω, 10K Ω, 300K Ω respectively; 315 is output port of power source; 316 send output for the change of 4-20mA; 312,313 is the CBB electrodeless electric capacity; 314 is crystal oscillator, and its value is got according to internal processes; 317 are the dot lcd screen, change are sent the results are shown on the screen, according to figure place showing desirable 4 * 12; 318, the 319, the 320th, programming and alignment settings button, i.e. contact button switch; 321 is alarm buzzer, desirable column type hummer; 322 is port, microcomputer can by this port to its calibrate, operation such as conditioning, temperature compensation.

Shown in Figure 4, described pressure elements or Silicon pressure sensitive element 404 are welded on the stainless steel L316 pedestal 401, this pedestal 401 is provided with the pressure connecting thread that is connected with tested pressure source, and its top is provided with the excitation power supply of pressure elements, pressure signal and temperature signal output terminal.Shown in the accompanying drawing, the 404th, pressure elements adopts here and wins this special sputtered film formula pressure elements or Silicon pressure sensitive element; 401 is stainless steel L316 pedestal; 403 is welds of 401 and 404, can adopt Laser Welding (LBW); 402 is the connecting thread of pressure, and directly is connected with tested pressure source; 405 are respectively excitation power supply, pressure signal and the temperature signal output terminal of pressure elements, directly are connected with the circuit shown in Fig. 2 or Fig. 3, are 207 on Fig. 2,301 on Fig. 3.

Fig. 2 described in the utility model and Fig. 3 are this routine electrical schematic diagrams, and principle is identical, just the difference of the conditioning chip that adopts.What Fig. 2 adopted is the elementary diagram of series such as ZMD31 series or MAX1426, and Fig. 3 is the elementary diagram that adopts FS98 series, and we can select a kind of mode wherein as required.

The utility model adopts and wins these special sputtered film formula pressure elements 404 (see figure 4)s, be welded on stainless steel (L316) pedestal, the 401st, the sensor of this routine pressure and temperature partly, 405 is the signal output point, handling single-chip with mixed signal is that 302 of 201 (see figure 2)s or Fig. 3 links, monolithic pressure conditioning chips such as ZMD3 series or MAX1426 and FS9821 or FS9822 or FS9824 are partly adopted in the conditioning of signal, be welded on the pcb board, with the signal output part of pressure transducer and excitation power supply+,-hold directly and the VINN of chip, VINP (pressure), IN3 (temperature), VBR, GND links, signal is by the chip internal programmable gain amplifier, AD converter, controller calibration, AD converter, programmable comparator, EEPROM (being used for calibration parameter setting and calibration arrangements), ROM (depositing calibration equation), the conditioning of PWM (PWM mode), through FI01, FI02 (output or and microcomputer communication), SIF (two-wire system and microcomputer communication) end output or and microcomputer communication, calibration, operations such as programming, the way of output can nurse one's health numeral by chip, aanalogvoltage, electric current, PWM etc., all operation conditionings utilize microcomputer to finish, if electric current, voltage output, output terminal adds triode and amplifies, warning and relay need add driving and amplify, as FS9821 or FS9822 or FS9824, inner band LCD drives, directly the lattice liquid crystal display screen is connected with the chip internal lcd driver and get final product, in the I/O pin with the SCL of 24C08, SDA connects, and in I/O, connect 3 buttons and be used for setup parameter, as above, lower limit reference mark and return difference value are specifically welded on the pcb board by Fig. 3.This utility model working temperature can reach :-70 ℃-300 ℃, thermal sensitivity drift is less than 0.005%FS ℃, error reaches 0.05%, maximum is non-linear to be 0.05%FS, long-time stability are better than 0.01%FS, power supply is 5VDC-40VDC power supply, but as output 4-20mA 8V-40VDC, but and two-wire system operate.

Claims

1, a kind of smart electronics pressure unit, it includes a pressure elements at least, it is characterized in that this pressure elements (101) links to each other with a signal processing chip (103) or signal condition chip through a pressure transducer (102), drive output numeral, aanalogvoltage, electric current, pwm signal (104) by it, and this chip (103) links to each other with microcomputer (105).

2, smart electronics pressure unit according to claim 1 is characterized in that described signal processing chip (103) or signal condition chip also are connected to the output of reporting to the police of LCD display (106) and bound, and disposes parameter button (108) is set.

3, smart electronics pressure unit according to claim 2, it is characterized in that described signal processing chip (103) adopts ZMD series or MAX1426 chip, it links to each other by pressure and this special sputtered film formula pressure elements of a temperature sensor and a victory or Silicon pressure sensitive element (404), and signal processing chip (201) links to each other with microcomputer by port (209,210), and drives output current signal or export digital signal by port (209) by amplifying triode (203) and resistance (204,205).

4, smart electronics pressure unit according to claim 2, it is characterized in that described signal condition chip (302) adopts the FS98 family chip as FS9821, FS9822, FS9824, it links to each other by pressure and this special sputtered film formula pressure elements of a temperature sensor and a victory or Silicon pressure sensitive element (404), and signal condition chip (302) disposes storage external (303), at least there is the electrorheological of 4-20MA to send output by port (316), and links to each other with microcomputer by port (322).

5, according to claim 3 or 4 described smart electronics pressure units, it is characterized in that described pressure elements or Silicon pressure sensitive element (404) are welded on the stainless steel L316 pedestal (401), this pedestal (401) is provided with the pressure connecting thread that is connected with tested pressure source, its top is provided with the excitation power supply of pressure elements, pressure signal and temperature signal output terminal.