Integrated anti riot thermal resistor

1. Application

Usually used in conjunction with display instruments, recording instruments, electronic computers, etc., it outputs 4-20mA and directly measures the gas quality of liquids, vapors, and solid surface temperatures within the range of -200 ℃ to 1300 ℃ in the presence of explosives such as carbon and chlorine compounds in the production site.

2. Characteristics

1. Two line output 4-20mA, strong anti-interference ability;

2. Save the cost of compensating wires and installing temperature transmitters;

3. Safe and reliable, with a long service life;

4. Cold end temperature automatic compensation, non-linear correction circuit;

3. Working principle

Explosion proof thermocouples utilize the principle of gap explosion-proof. When an explosion occurs inside the chamber, it can be extinguished and cooled through the gap between the joint surfaces, preventing the full temperature of the flame after the explosion from being transmitted outside the chamber, thus achieving explosion-proof.
The thermoelectric potential (resistance) generated by the thermocouple (thermistor) passes through the bridge of the temperature transmitter to generate an unbalanced signal. After amplification, it is converted into a 4-20mA DC electrical signal and sent to the working instrument, which displays the corresponding temperature value.

4. Product execution standards

1. IEC584

2. IEC751

3. IEC1515

4. JB/T5518-91

5. JB/T7391-94

5Integrated explosion-proof thermistor, integrated display meter, WZPBTemperature measurement range and allowable deviation

1) Temperature measurement range and tolerance of thermistor

2) Thermocouple temperature measurement range and tolerance

6. Output signal： 4-20 mA ， Load resistance 250, transmission wire resistance 100

7. Output method: Two line system

8. Accuracy level：
Temperature transmitter accuracy level: 0.1 0.2 0.5
Display accuracy level: Analog indicator 2.5 level; Digital display level 0.5

9. Power supply：24V. DC±10 ℅

10. Protection level：IP65

11. Explosion proof grade：

Explosion proof type: d Ⅱ BT4 d Ⅱ CT5 d Ⅱ CT6
Intrinsic safety type: ia Ⅱ CT6

12. Insulation resistanceThe insulation resistance between the instrument output terminal and the housing should not be less than 50

13Integrated explosion-proof thermistor, integrated display meter, WZPBThermal response time：

When there is a step change in temperature, the time required for the current output signal of the instrument to change to 50% of the step change is usually represented by t0.5. When the step response stabilization time of the temperature transmitter does not exceed one-fifth of the thermocouple (resistance) thermal response stabilization time t0.5, the thermocouple (resistance) thermal response time is used as the thermal response time of the instrument; When the step thermal response stability time of the temperature transmitter does not exceed half of the thermocouple (resistance) thermal response stability time t0.5, the thermal response time of the temperature transmitter is used as the thermal response time of the instrument;

14. Basic errorThe basic error of the instrument should not exceed the combined error of the basic errors of the thermocouple (resistor) and temperature transmitter.

15. Working environment：

16. Determination of support tube lengthThe working temperature of the temperature transmitter is the sum of the shell temperature rise caused by the support tube and the environment. The shell temperature rise caused by the support tube is shown in the following figure.

17. List of Evidence Collection:

18. Instrument wiring method

20Integrated explosion-proof thermistor, integrated display meter, WZPB modelSelection Table(For other sensor selection, please refer to the assembly of thermocouples/resistors or explosion-proof thermocouples/resistors)

1) The company can also customize various special models of thermocouples, thermistors, bimetallic thermometers, and flange sleeves according to samples or drawings.

2) Thermocouples of Class I and resistance of Class A shall be ordered according to the agreement;

3) The material of the protective tube is 1Cr18Ni9Ti, and other materials are ordered according to the agreement.

21. Selection Notice

Model A

B division number

Explosion proof grade C

Accuracy level of thermocouple (resistance)

Accuracy level of temperature transmitter (display)

F installation fixed form

Material of protective tube g

Length or insertion depth of h