CN2032714U

CN2032714U - Digital electric transferring device checker

Info

Publication number: CN2032714U
Application number: CN 88203392
Authority: CN
Inventors: 刘长明
Original assignee: Individual
Current assignee: Individual
Priority date: 1988-02-14
Filing date: 1988-02-14
Publication date: 1989-02-15

Abstract

The utility model discloses a digital electric transferring device checker, comprising a DDZ-II, III electrodynamic differential pressure, a pressure transmitter for verifying the required power, a vernier air pressure signal generator (or setting adjuster), a numeric display input pressure measurer of verifying transmitter, an output electric current measurer, and a scavenging valve for verifying zero. Pressing the scavenging valve button can keep the primary pressure in the pressure generator, making the transmitter and the pressure sensor input opening to atmosphere, and convenient for verifying. The utility model can be made into serial products by using different pressure sensor in measuring range or accuracy, and the appearance size is less than 420*320*120 mm.

Description

Digital electric transferring device checker

The utility model design is about digital electronic transmitter tester, this tester has DDZ-II, the electronic differential pressure of III type, the needed power supply of pressure unit verification simultaneously, fine-tuning air pressure signal generator (or valuator), numeral show by school transmitter input pressure measuring instrument and output current measuring instrument, and be provided with school zero scavenging air valve.

DDZ-II, the electronic differential pressure of III type, pressure unit are extensive use of in automatic control system of industries such as metallurgy, chemical industry, and need periodic check, but none multiple functional tester still so far.Verification in the past is: input pressure is seldom used digital pressure gauge (cost height) with U type pipe fluid column, pointer gauge measurement; Output current is measured and is used the pointer reometer, seldom uses digital electronic ammeter (cost height); Independent stabilized voltage supply, pressure generator, pull-up resistor case, several leads, several tracheaes, threeway etc., link and gas circuit are all very complicated, field-checking will be moved many instrument, utensil, operate very inconvenient, and U type pipe fluid column, pointer gauge measurement pressure, pointer reometer are measured electric current and are all had the big collimation error, can not satisfy the higher transmitter verification requirement of present precision.The more instrument of functions such as digital electronic ammeter only uses seldom part of functions when the transmitter verification, very uneconomical.

The task of the utility model design provides the low and multiple functional digital electric moment of a kind of cost and presses, the pressure unit tester, only need there be this tester just can be to the DDZ-II, the electronic differential pressure of III type, pressure unit carries out adjustment, school zero scavenging air valve also has been installed on this tester, just can make the former pressure of maintenance in the pressure generator as long as click button, and allow by the logical atmosphere of the sensor of school transmitter and digital pressure measuring instrument input, this is well suited for transmitter zero point, the adjustment repeatedly of range, and slowly be not added to full scale with pressure generator by zero repeatedly, use very convenient.

This tester design proposal is: produced (having the ground at gas station that valuator can be installed) by school transmitter input air pressure signal by fine-tuning piston type or hand pulling type low-pressure generator.The gas signal through school zero scavenging air valve after, feed by the school transmitter with threeway one end, one end feeds high-precision pressure sensor, through the linear millivolt electric signal of sensor conversion output and pressure, be amplified into 4 1/2 bit digital panel tables by the high precision linear amplifier of adjustable enlargement factor and zero-bit again and demonstrate force value, unit is KPa, use measurement range or the different sensor of precision can constitute serial tester, precision can require to reach 0.05 grade, 0.1 grade, 0.2 grade etc. according to difference.On the other hand, 220V.AC step-down enters source of stable pressure and obtains the 24V.DC power supply through transformer, (also can be made into digital and Adjustable), process II, the conduct of III type selector switch are by the power supply of school DDZ-III type transmitter, constitute the verification loop with pull-up resistor and accurate sample resistance, will be sent into 4 1/2 bit digital panel tables by school transmitter output signal pressure on precision resistance and show.When verification DDZ-III type transmitter, as long as selector switch is pressed the III key, just cut off the 24V.DC power supply, and connection signal loop still, III type transmitter power supply is provided by 220V.AC socket on the panel.This tester also can change the output of verification circuit connection and source of stable pressure and the requirement of adaptation verification different pressures sensor.

The digital electronic transmitter tester of the utility model design is compared with the used instrument of transmitter verification in past: have one instrumental function is complete and cost is not high, link during verification, gas circuit are simple, and added school zero scavenging air valve, advantages such as vast transmitter user field-checking is very convenient, practicality.

Accompanying drawing has been described an embodiment of the utility model design.

Accompanying drawing 1: digital electronic transmitter tester panel figure.

Accompanying drawing 2: the electrical schematic diagram of this tester.

Accompanying drawing 3: the gas schematic diagram of this tester.

Fig. 1 is the tester panel, and it has shown the function of this tester: 4 1/2 bit digital panel tables (1) shown by binding post (9) input validation loop by the output signal of school transmitter (19) pressure value on 50 Ω resistance.4 1/2 bit digital panel tables (2) have shown to connect from gas chews (7) input by the gas signal pressure value KPa of school transmitter (19), rocking-turn low-pressure generator handle (3a) produces the gas signal (having the place at gas station that valuator is installed) of required size, uses when simple and easy air release (4) leads to atmosphere for whole gas circuit.Button (5a) is school zero a scavenging air valve button.Zero potentiometer knob (6a) is to adjust the zero-bit that pressure shows 4 1/2 plane plate tables (2) at any time, button (8) is the selector switch of verification DDZ-II type or III type transmitter, socket (10) lining is the 220V.AC power supply of verification DDZ-II type transmitter, tape light keyswitch (11) is a battery main switch, and the tester overall dimensions can be less than 420 * 320 * 120mm.

Fig. 2 is the more detailed electric theory diagram of tester, and constant current source (12) is the power source special of high-precision pressure sensor (13).Sensor (13) converts pressure signal to linear millivolt electric signal input high precision linear amplifier (15) and amplifies, adjust circuit (17) by full scale and regulate enlargement factor, make the voltage digital of sending into the demonstration of 4 1/2 bit digital panel tables (2) just in time the same with the pressure on the number that sensor (13) detects.For example: sensor full scale input 199.99KPa, make amplifier (15) be output as 1.9999V.DC by regulating (17), change establish 4 1/2 bit digital panel tables (2) radix point after the 3rd, can demonstrate 199.99KPa.Compensation feedback (16) can make it more linearization to non-linear necessarily compensation of sensor (13) output signal.Zero adjustment circuit (6) is that the zero-bit of adjusting amplifier (15) is at any time exported, to guarantee that when sensor (13) input pressure was zero, 4 1/2 bit digital panel tables (2) showed zero.Source of stable pressure (14) is the power supply of amplifier (15).The required power supply 24V.DC of source of stable pressure (18) output DDZ-III type transmitter, insert verification loop (when pressing the III key) by the straight key selector switch of folk art term interlocking (8), when pressing the II key, just cut off the 24V.DC power supply, and still connected the verification loop.R2 is a verification loop load resistance, resistance 200 Ω, R1 is the accurate sample resistances of 50 Ω, by school transmitter output signal 4～20mA.DC(III type) or 0～10mA.DC(III type) on R1 pressure import 4 1/2 bit digital panel tables (1) and demonstrate 0.2000～1.0000V.DC or 0.0000～0.5000V.DC, improved accuracy in detection like this.

Fig. 3 is a tester air pressure schematic diagram, and the air pressure signal that fine-tuning piston type or hand pulling type pressure generator (3) (having the ground at gas station that valuator can be installed) produce enters sensor (13) by the zero scavenging air valve (5) in school and by school transmitter (19).The decrement of the high elastic rubber pad (5b) of school zero scavenging air valve (5) is 1～2mm, when pressing the button (5a), seal (hole 1) earlier, low-pressure generator internal gas pressure is kept, just make (hole 2) venting then, allow sensor (13) and by the logical atmosphere of school transmitter (19); When release button (5a), the strength of spring (5c) is sealed (hole 2) earlier, just puts logical (hole 1) then.Air release (4) is the open to atmosphere switch of whole gas circuit when being connected to by school transmitter (19).

Claims

1, digital electronic transmitter tester, it is characterized in that: it has DDZ-II, the electronic differential pressure of III type, required 220VAC and the 24VDC power supply of pressure unit verification simultaneously, fine-tuning air pressure signal generator (or valuator), numeral show by school transmitter input pressure measuring instrument and output current measuring instrument, and be provided with school zero scavenging air valve, inside has connected checking circuit and gas circuit.

2, according to the tester of claim 1, it is characterized in that: the air pressure signal that fine-tuning piston type or hand pulling type pressure generator (3) (having the ground at gas station that valuator can be installed) produce enters sensor (13) by the zero scavenging air valve (5) in school and by school transmitter (19).Sensor (13) converts pressure signal to linear millivolt electric signal input high precision linear amplifier (15) and amplifies, adjust circuit (17) by full scale and regulate enlargement factor, make the voltage digital of sending into the demonstration of 4 1/2 bit digital panel tables (2) just in time the same with the pressure on the number that sensor (13) detects.Compensation feedback (16) can be to non-linear necessarily compensation of sensor (13) output signal, and zero adjustment circuit (6) can be adjusted the zero-bit output of amplifier (15) at any time.The required 24V.DC power supply of source of stable pressure (18) output DDZ-III type transmitter, insert verification loop (when pressing the III key) by folk art term interlocking uni-directional push-button switch (8), when pressing the II key, just cut off the 24V.DC power supply, and still connect the verification loop, DDZ-II type transmitter power supply is provided by socket on the panel (10), there is the accurate sample resistance R1 of 200 Ω pull-up resistor R2 and 50 Ω in the verification loop, by school transmitter output signal 4～20mA.DC(III type) or 0～10mA.DC(III type) on R1 pressure import 4 1/2 bit digital panel tables (1) and demonstrate 0.2000～1.0000 or 0.0000～0.5000.Also can change the output valve of source of stable pressure (18) and verification circuit connection and adapt to the requirement of verification different pressures sensor.

3, according to claim 1 or the described tester of claim 2, it is characterized in that: the decrement of the high elastic rubber pad (5b) of school zero scavenging air valve (5) is 1～2mm, when pressing the button (5a), sealing (hole 1) earlier keeps low-pressure generator internal gas pressure, just make (hole 2) venting then, allow sensor (13) and by the logical atmosphere of school transmitter (19); When release button (5a), the strength of spring (5c) is sealed (hole 2) earlier, just puts logical (hole 1) then.