CN201277898Y

CN201277898Y - Double core differential pressure transmitter

Info

Publication number: CN201277898Y
Application number: CNU2008202221653U
Authority: CN
Inventors: 谷荣祥; 郭和平; 李利; 来军平
Original assignee: XI'AN CHINASTAR M&C Ltd
Current assignee: XI'AN CHINASTAR M&C Ltd
Priority date: 2008-10-30
Filing date: 2008-10-30
Publication date: 2009-07-22
Anticipated expiration: 2018-10-30

Abstract

The utility model discloses a twin-core body differential pressure transmitter comprising two pressure sensors used for detecting the pressure value in real time and a signal modulation part, wherein the signal modulation part consists of a circuit board and a signal conversion circuit arranged on the circuit board; and the two pressure sensors are both connected with the signal conversion circuit which compares and converts the two paths of pressure signals detected by the tow pressure sensors to be standard output signals of 4-20 mA. The utility model has simple structure, low cost, simple and convenient use and operation and high precision and can further minish the variation caused by nonlinearity and elastic hysteresis.

Description

Twin-core body differential pressure transmitter

Technical field

The utility model relates to electrical equipment checkout equipment technical field, especially relates to a kind of twin-core body differential pressure transmitter that is used for the gaging pressure differential pressure flow.

Background technology

What two more than ten years of past continued to use always is the known force balance type twin-core of people body differential pressure transmitter, it be utilize that degree of depth negative-feedback principle reduces that the flexible member modulus varies with temperature, the influences that factor caused such as elastic hysteresis and nonlinear deformation, thereby guarantee measuring accuracy.Therefore, the structure of employed transmitter of the force balancing type is all complicated and heavy, use is inconvenient, also exists the static pressure error problem that is difficult to eliminate simultaneously.Along with the continuous development of new material, the very little resilient material of module of elasticity and temperature coefficient has appearred; Particularly the development of electric detective technology makes the detection of micro-displacement become possibility, thereby also allows the resilient material distortion little, and this just makes non-linear and the caused variation of elastic hysteresis further reduces.

The utility model content

Technical problem to be solved in the utility model is at above-mentioned deficiency of the prior art, a kind of twin-core body differential pressure transmitter is provided, it is simple in structure, cost is low, use is easy and simple to handle and precision is high, non-linear and the caused variation of elastic hysteresis further can be reduced.

For solving the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of twin-core body differential pressure transmitter, it is characterized in that: form by two pressure transducer and signal modulating parts that are used for real-time detected pressures value, described signal modulating part is made up of circuit board and the signaling conversion circuit that is arranged on the described circuit board, two pressure transducers all connect signaling conversion circuit, and signaling conversion circuit compares the detected two-way pressure signal of pressure transducer and be converted to the standard output signals of 4-20mA.

Be connected by lead between the output terminal of described pressure transducer and the input end of signaling conversion circuit.

Described two pressure transducers are for carrying out the pressure resistance type open loop pressure transducer of seal protection to its outside, chip is sent in the integrated change of signaling conversion circuit sensor.

Described pressure resistance type open loop pressure transducer is chip PR-10, and described sensor is that integrated change send chip to be chip XTR101.

Described two pressure transducers and described signal modulating part are installed in " T " font enclosure interior empty in, two pressure transducers are installed in down " T " font lower part of frame both sides, and " T " font lower part of frame two ends encapsulate by bolt; Described signal modulating part is installed in down the middle part of " T " font housing, and the output line of signaling conversion circuit is from passing on " T " font housing.

The utility model compared with prior art has the following advantages, 1, not only simple in structure, cost is low, processing and fabricating is convenient and use easy and simple to handle; 2, adopt two pressure resistance type open loop pressure transducer and signal modulating parts with signaling conversion circuit with Sensitive Apparatus, non-linear and the caused variation of elastic hysteresis is further reduced, and, making the transmitter precision higher by calibrating sensors sensitivity, structure is simpler; 3, applied widely, can effectively be applicable to industries such as petrochemical industry, iron and steel, papermaking, food, medicine.

Below by drawings and Examples, the technical solution of the utility model is described in further detail.

Description of drawings

Fig. 1 is a circuit block diagram of the present utility model.

Fig. 2 is a structural representation of the present utility model.

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

Description of reference numerals:

The 1-pressure transducer; The 2-signaling conversion circuit; 3-is " T " font housing; The 4-bolt.

Embodiment

As shown in Figure 1 and Figure 2, the utility model is made up of two pressure transducer 1 and signal modulating parts that are used for real-time detected pressures value, described signal modulating part is made up of circuit board and the signaling conversion circuit 2 that is arranged on the described circuit board, two pressure transducers 1 all connect signaling conversion circuit 2, and signaling conversion circuit 2 compares pressure transducer 1 detected two-way pressure signal and be converted to the standard output signals of 4-20mA.Be connected by lead between the input end of the output terminal of described pressure transducer 1 and signaling conversion circuit 2.Described two pressure transducers 1 are for carrying out the pressure resistance type open loop pressure transducer of seal protection to its outside, chip is sent in the integrated change of signaling conversion circuit 2 sensors.Described pressure resistance type open loop pressure transducer is chip PR-10, and described sensor is that integrated change send chip to be chip XTR101.

Described two pressure transducers 1 and described signal modulating part are installed in " T " font housing 3 inside empty in, two pressure transducers 1 are installed in down the both sides, bottom of " T " font housing 3, and the two ends, bottom of " T " font housing 3 encapsulate by bolt 4; Described signal modulating part is installed in down the middle part of " T " font housing 3, and the output line of signaling conversion circuit 2 passes from falling " T " font housing 3 upper ends, and specifically being electric current output line a and power lead b passes from falling " T " font housing 3 upper ends.

In conjunction with Fig. 3, two pressure transducers 1 are that two pressure resistance type pressure chip PR-10 are chip SEN1 and chip SEN2, and the 1st end of described chip SEN1 and chip SEN2 meets two input end IREF1 and the IREF2 of chip XTR101 respectively; Connect the IN+ input end of chip XTR101 after the 2nd end of chip SEN1 and the 4th end of chip SEN2 join, connect the IN-input end of chip XTR101 after the 4th end of chip SEN1 and the 2nd end of chip SEN2 join; The 3rd end of chip SEN1 and the 5th end connect the OUT end of chip XTR101 respectively behind resistance R 1 and R2 and resistance R 9A, the 3rd end of chip SEN1 and the 5th end connect the OUT end of chip XTR101 respectively behind resistance R 3 and R4 and resistance R 9A; Resistance R 9A goes up and is connected to capacitor C 2.Two stiff ends that described slip becomes resistance RP1 are connected on respectively on the 2nd pin and the 1st pin of chip XTR101, slide to become the movable end that hinders RP1 meets chip XTR101 after resistance R 10 the 14th pin.Being connected between the 5th pin of chip XTR101 and the 6th pin slides becomes resistance RP2 and R11, the 12nd pin of chip XTR101 is the base stage of BCTL termination triode Q1, the emitter of triode Q1 connects the E end of chip XTR101, the collector of triode Q1 connects chip XTR101's+the VCC end, the OUT of described chip XTR101 end and+the VCC end between and be connected to filter capacitor C1 and Transient Suppression Diode TVSI, chip XTR101+the VCC end is serially connected with D1 with importing between the power supply.

The course of work of the present utility model is: at first, pressure change signal inputs to the signal modulating part after converting micro-electric signal to by sensor chip, converts the 4-20mA standard output signals to after handling through the signaling conversion circuit in the signal modulating part 2 again.

The above; it only is preferred embodiment of the present utility model; be not that the utility model is imposed any restrictions; everyly any simple modification that above embodiment did, change and equivalent structure are changed, all still belong in the protection domain of technical solutions of the utility model according to the utility model technical spirit.

Claims

1. twin-core body differential pressure transmitter, it is characterized in that: form by two pressure transducer (1) and signal modulating parts that are used for real-time detected pressures value, described signal modulating part is made up of circuit board and the signaling conversion circuit (2) that is arranged on the described circuit board, two pressure transducers (1) all connect signaling conversion circuit (2), and signaling conversion circuit (2) compares the detected two-way pressure signal of pressure transducer (1) and be converted to the standard output signals of 4-20mA.

2. according to the described twin-core body of claim 1 differential pressure transmitter, it is characterized in that: be connected by lead between the output terminal of described pressure transducer (1) and the input end of signaling conversion circuit (2).

3. according to claim 1 or 2 described twin-core body differential pressure transmitters, it is characterized in that: described two pressure transducers (1) are for carrying out the pressure resistance type open loop pressure transducer of seal protection to its outside, signaling conversion circuit (2) send chip for the integrated change of sensor.

4. according to the described twin-core body of claim 3 differential pressure transmitter, it is characterized in that: described pressure resistance type open loop pressure transducer is chip PR-10, and the integrated change of described sensor send chip to be chip XTR101.

5. according to claim 1 or 2 described twin-core body differential pressure transmitters, it is characterized in that: described two pressure transducers (1) and described signal modulating part are installed in " T " font housing (3) inside empty in one, two pressure transducers (1) are installed in down the both sides, bottom of " T " font housing (3), and the two ends, bottom of " T " font housing (3) encapsulate by bolt (4); Described signal modulating part is installed in down the middle part of " T " font housing (3), and the output line of signaling conversion circuit (2) is from passing on " T " font housing (3).