The change in thermoelectric potential (resistance) measured by the thermocouple (resistance) in the working state generates an unbalanced signal through the bridge of the temperature transmitter.
Output signal: 4-20 mA, load 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 indication level 2.5; digital display level 0.5.
Power supply: 24V.DC±10℅
Protection level: IP65
Explosion-proof level:
Explosion-proof type: dⅡBT4 dⅡCT5 dⅡCT6
Intrinsically safe type: iaⅡCT6
Insulation resistance: The insulation resistance between the instrument output terminal and the shell should not be less than 50.
Thermal response time:
When there is a step change in temperature, the instrument's The time required for the current output signal to change to 50% of the step change, usually expressed as t0.5. When the step response stabilization time of the temperature transmitter does not exceed the thermocouple (resistance) thermal response stabilization time t0.5 When one-fifth of the value, the thermocouple (resistance) thermal response time is used as the thermal response time of the instrument; when the step thermal response stabilization time of the temperature transmitter does not exceed the thermocouple (resistance) thermal response stabilization time t0.5 When one-half of the value, the thermal response time of the temperature transmitter is used as the thermal response time of the instrument;
Basic error:
The basic error of the instrument should not exceed the combined error of the basic error of the thermocouple (resistance) and the temperature transmitter.
Working Principle
The change in thermoelectric potential (resistance) measured by the thermocouple (resistance) in the working state generates an unbalanced signal through the bridge of the temperature transmitter, which is amplified and converted It becomes a 4-20mA electrical signal to the working instrument, and the working instrument displays the corresponding temperature value.
The explosion-proof thermocouple (resistance) uses the principle of gap explosion-proof. When an explosion occurs in the cavity, it can be extinguished and cooled through the gap between the joint surfaces, so that the flame and temperature after the explosion cannot be transmitted outside the cavity, thus Take a temperature measurement. The thermoelectric potential (resistance value) generated by the thermocouple (resistance) passes through the bridge of the temperature transmitter to generate an unbalanced signal. After amplification, it is converted into a 4-20mA DC signal and sent to the worker's instrument. The working instrument displays the corresponding temperature value.
◆Main technical parameters
Product implementation standards
IEC584
IEC751
IEC1515
JB/TJB/T
◆Measurement range and tolerance
1) Thermal resistance temperature measurement range and tolerance
Model graduation number temperature measurement range ℃ accuracy grade allowable deviation WZPBPt+500A level B±(0.15+0.002ItI)±(0.30+0.005 ItI)WZCBCu50 Cu+100 ±(0.30+0.005 ItI)Output signal: 4-20 mA, load 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 indication level 2.5; digital display level 0.5.
Power supply: 24V.DC±10℅
Protection level: IP65
Explosion-proof level:
Explosion-proof type: dⅡBT4 dⅡCT5 dⅡCT6
Intrinsically safe type: iaⅡCT6
Insulation resistance: The insulation resistance between the instrument output terminal and the shell should not be less than 50.
Thermal response time:
When there is a step change in temperature, the instrument's The time required for the current output signal to change to 50% of the step change, usually expressed as t0.5. When the step response stabilization time of the temperature transmitter does not exceed the thermocouple (resistance) thermal response stabilization time t0.5 When one-fifth of the value, the thermocouple (resistance) thermal response time is used as the thermal response time of the instrument; when the step thermal response stabilization time of the temperature transmitter does not exceed the thermocouple (resistance) thermal response stabilization time t0.5 When one-half of the value, the thermal response time of the temperature transmitter is used as the thermal response time of the instrument;
Basic error:
The basic error of the instrument should not exceed the combined error of the basic error of the thermocouple (resistance) and the temperature transmitter.
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