![[cimages:title]](/upLoad/product/month_2101/202101231535043146.jpg)
product manual:
application
Usually used in conjunction with display instruments, recording instruments, electronic computers, etc., output 4-20mA, directly measure the gas quality of liquid, vapor and solid surface temperature in the range of -200℃-1300℃ where there are explosives such as carbon and chlorine compounds at the production site.
Features
Two-wire system output 4-20mA, strong anti-interference ability;
Save the cost of compensation wire and installation of temperature transmitter;
Large range of savings;
Automatic cold junction temperature compensation, nonlinear correction circuit;
working principle
The change of the thermoelectric potential (resistance) measured by the thermocouple (resistance) in the working state will generate an unbalanced signal through the bridge of the temperature transmitter, which is amplified and converted into a 4-20mA electric signal to the working instrument and working instrument The corresponding temperature value is displayed.
Explosion-proof thermocouple (barrier) uses the principle of gap explosion-proof, when an explosion occurs in the cavity, it can be extinguished and cooled through the gap of the joint surface, so that the flame and temperature after the explosion can not be transmitted outside the cavity, thereby measuring the temperature. The thermoelectric potential (resistance value) generated by the thermocouple (resistance) passes through the bridge of the temperature transmitter to produce an unbalanced signal, which is amplified and converted into a 4-20mA direct current signal to the worker's instrument. The working instrument displays the corresponding temperature value.
The main technical parameters
Product performance standards
IEC584
IEC751
IEC1515
JB/T5518-91
JB/T7391-94
Measuring range and tolerance
1) Thermal resistance temperature measurement range and tolerance
2) Thermocouple temperature measurement range and tolerance
Output signal: 4-20 mA, load resistance 250, transmission wire resistance 100
Output method: Two-wire system
Accuracy level:
Temperature transmitter accuracy grade: 0.1 0.2 0.5
Display accuracy level: analog indicator type 2.5 level; digital display type 0.5 level.
Power supply: 24V.DC±10℅
Protection level: IP65
Explosion-proof grade:
Flameproof type: dⅡBT4 dⅡCT5 dⅡCT6
Intrinsically safe type: iaⅡCT6
Insulation resistance: The insulation resistance between the output terminal of the instrument 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 instrument's current output signal to change to 50% of the step change, usually t0.5 indicates when the temperature transmitter's step response stabilization time does not exceed the thermocouple When (resistance) thermal response stability time is one-fifth of 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 the thermocouple (Resistance) When the thermal response stabilization time is half of t0.5, 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.
