VIP member
Equipped with temperature transmitter (explosion-proof) and thermistor
Applications are usually used in conjunction with display instruments, recording instruments, electronic computers, etc., with an output of 4-20mA, to
Product details
| 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. |
|
|
feature |
|
|
Two line output 4-20mA, strong anti-interference ability;
|
|
Save the cost of compensating wires and installing temperature transmitters;
|
| Large range of savings; |
| Cold end temperature automatic compensation, non-linear correction circuit; |
|
|
working principle |
|
| The change in thermoelectric potential (resistance) measured by a thermocouple (resistor) in working condition generates an unbalanced signal through the bridge of a temperature transmitter, which is amplified and converted into4-20mAThe electrical signal is sent to the working instrument, and the working instrument displays the corresponding temperature value. |
| Explosion proof thermocouple (resistor) utilizes the principle of gap explosion-proof. When an explosion occurs inside the chamber, it can extinguish and cool through the gap between the joint surfaces, preventing the flame and temperature after the explosion from being transmitted outside the chamber, thus enabling temperature measurement. The thermoelectric potential (resistance value) generated by the thermocouple (resistor) is amplified and converted into an unbalanced signal through the bridge of the temperature transmitterA 4-20mA DC electrical signal is sent to the worker's instrument, and the working instrument displays the corresponding temperature value. |
|
|
Main technical parameters |
|
|
Product execution standards IEC584 IEC751 IEC1515 JB/T5518-91 JB/T7391-94 |
|
|
Measurement range and tolerance |
|
|
1) Temperature measurement range and tolerance of thermistor
|
| Model | Dividing number | Temperature measurement range ℃ | accuracy class | allowable deviation |
| WZPB | Pt100 | -200-+500 |
Grade A, Grade B
|
± (0.15 + 0.002 ITI)
± (0.30 + 0.005 ITI)
|
| WZCB | Cu50 Cu100 | -50-+100 | ± (0.30 + 0.005 ITI) |
|
2) Thermocouple temperature measurement range and tolerance
|
| Model | Dividing number | Tolerance 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% smile | 333-1200 | ||
| WRMB | N | ±1.5℃ | -40-375 | ±2.5℃ | -40-333 |
| ± 0.004 ITI | 375-1000 | 0.0075% smile | 333-1200 | ||
| WREB | E | ±1.5℃ | -40-375 | ±1.5℃ | -40-333 |
| ± 0.004 ITI | 375-800 | 0.004% smile | 333-900 | ||
| WRFB | J | ±1.5℃ | -40-375 | ±1.5℃ | -40-333 |
| ± 0.004 ITI | 375-750 | 0.004% smile | 333-750 | ||
| WRCB | T | ±1.5℃ | -40-125 | ±1℃ | -40-133 |
| ± 0.004 ITI | 125-350 | 0.0075% smile | 133-1000 | ||
| Output signal:4-20 mALoad resistance 250, transmission wire resistance 100 |
| Output method:two-wire system |
|
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 |
| Power supply: 24V DC ± 10 ℅ |
| Protection level: IP65 |
|
Explosion proof grade: Explosion proof type: d Ⅱ BT4 d Ⅱ CT5 d Ⅱ CT6 Intrinsic safety type: ia Ⅱ CT6 |
| Insulation resistanceThe insulation resistance between the instrument output terminal and the housing should not be less than 50 |
|
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 of the instrumentTime; |
|
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. |
|
|
Selection method |
Online inquiry
-
Contacts
-
Company
-
Telephone
-
Email
-
WeChat
-
Verification Code
-
Message Content
-