Explosion proof thermocouple temperature transmitter

Explosion proof thermocouple temperature transmitterWRNKB--348

Detailed information on the integrated explosion-proof thermistor (with temperature transmitter): 1. It is 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 ℃ -1300 ℃ in the presence of explosive substances such as carbon and chlorine compounds in the production site.

2. Features: Two line output 4-20mA, strong resistance to * *; Save the cost of compensating wires and installing temperature transmitters; Safe and reliable, with a long service life; Cold end temperature automatic compensation, non-linear correction circuit;

3. The working principle of explosion-proof thermocouples is based on 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, so that the full temperature of the flame after the explosion cannot be 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. Main technical parameters: Product execution standard IEC584 IEC751 IEC1515 JB/T5518-91 JB/T7391-94

5. Temperature measurement range and tolerance 1) Thermistor temperature measurement range and tolerance model division number Temperature measurement range ℃ Accuracy level allowable deviation

WZPB Pt100 -200-+500 B 级 ±（0.15+0.002ItI） ±（0.30+0.005 ItI）

WZCB Cu50 Cu100 -50-+100   ±（0.30+0.005 ItI）

2) Thermocouple temperature measurement range and allowable deviation model, division number, allowable deviation level I II, allowable deviation temperature measurement range ℃, allowable deviation temperature measurement range

WRNB K ±1.5℃ -40-375 ±2.5℃ -40-333 ±0.004 ItI 375-1000 0.0075 ItI 333-1200

Wrmb n ± 1.5 ℃ - 40 - 375 ± 2.5 ℃ - 40 - 333 ± 0.004 ITI 375 - 1000 0.0075 ITI 333 - 1200

WREB E ±1.5℃ -40-375 ±1.5℃ -40-333 ±0.004 ItI 375-800 0.004 ItI 333-900

WRFB J ±1.5℃ -40-375 ±1.5℃ -40-333 ±0.004 ItI 375-750 0.004 ItI 333-750

WRCB T ±1.5℃ -40-125 ±1℃ -40-133 ±0.004 ItI 125-350 0.0075 ItI 133-1000

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; 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 resistance: The insulation resistance between the instrument output terminal and the housing should not be less than 50

13. Thermal 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 error: The 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: Installation site level Temperature ℃ Relative humidity% Atmospheric pressure KPa Cx1-25-+55 5-95 86-106

Cx2 -25-+70 Cx3 -40-+80

16. Determination of support tube length: The working temperature of the temperature transmitter is determined by the sum of the shell temperature rise caused by the support tube and the environment,

The temperature rise of the shell caused by the support tube is shown in the following figure.

17. List of Evidence Collection: Explosion proof Level Explosion proof Certificate Number Certification Institution d Ⅱ BT4 GYB97151 NEPSI d Ⅱ BT4

GYB97152 NEPSI dⅡCT4 GYB97203 NEPSI dⅡCT4

GYB97204 NEPSI iaⅡCTT6 GYB99412 NEPSI iaⅡCTT6 GYB99413 NEPSI

Note: NEPSI Explosion proof Certification System * Instrument and Meter Explosion proof Safety Supervision and Inspection Station

18. Instrument wiring method

19. Model Naming Rules

20. Model and specification examples: No fixed device (for other sensor selection, please refer to the assembly thermocouple/resistor or explosion-proof thermocouple/resistor) Model division number Temperature measurement range ℃ Thermal response time Explosion proof level specification d L

WRMB-140 WRMB-140G K 0-800 ＜90S dⅡBT4 dⅡCT5 dⅡCT6 iaⅡCT6 Φ16

300X150 350X200 400X250 450X300 500X350 550X400 650X500

900X750 1150X1000 1650X1500 2150X2000 ＜24S

WRNB-140 WRNB-140G N 0-800 ＜90S ＜24S

WREB-140 WREB-140G E 0-600 ＜90S ＜24S WRCB-140

WRCB-140G T 0-350 ＜90S ＜24S WRFB-140

WRFB-140G J 0-55 ＜90S ＜24S

WZPB-141 WZPB-141G Pt100 -200-500 ＜120S Φ12 ＜24S

WZCB-141 WZCB-141G Cu50 -50-100 ＜120S ＜24S

1) Thermocouple Class I thermistor is ordered according to the agreement;

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

21. Selection Notice Type A, Division B, Explosion proof Rating, Thermocouple (Resistance) Accuracy Rating, Temperature Transmitter (Display)

Accuracy level f, installation and fixing form g, material of protective tube? Length or insertion depth of h