Two-wire output 4-20mA, anti-jamming;
Saving temperature transmitter compensation wire and installation costs;
Safe, reliable, long life;
Automatic cold junction temperature compensation, nonlinear correction circuit;
Thermocouple (Resistance) in the operating state of the measured thermoelectric power (resistance) changes, after the bridge temperature transmitter unbalanced signal after amplification 4-20mA converted into an electrical signal to the working instruments, working instrument will show the corresponding temperature value.
Flameproof Thermocouple (Resistance) the use of space explosion principle, when the cavity explosion, through the gap between the flame and cooling joints, so that after the explosion of flame and temperature not pass outside the cavity, thereby performing temperature. Thermocouple (Resistance) produced by thermoelectric power (resistance value) after the bridge temperature transmitter unbalanced signal after amplification converted into 4-20mA DC signal to the workers in the instrument, the working instrument shows the corresponding temperature value.
•The main technical parameters
Product performance standards
JB / T5518-91
JB / T7391-94
• measuring range and tolerance
1) Thermal resistance Temperature range and tolerance
Model sub-degree temperature range ℃ Accuracy class Tolerance WZPBPt100-200- + 500
A Grade B Grade
± (0.15 + 0.002ItI)
± (0.30 + 0.005 ItI)
WZCBCu50 Cu100-50- + 100 ± (0.30 + 0.005 ItI)
2) Thermocouple Temperature range and tolerance models indexing number tolerance value tolerance level III temperature range ℃ temperature range tolerance value 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
Output signal: 4-20 mA, load resistor 250, a transmission line resistance 100
Output method: Two-wire
Temperature transmitter Accuracy: 0.1 0.2 0.5
Display Accuracy: analog indication type 2.5; digital display type 0.5.
Power supply: 24V.DC ± 10℅
Flameproof: dⅡBT4 intrinsically safe: iaⅡ Insulation resistance: insulation resistance meter between the output terminals and the case should not be less than 50.
Thermal response time:
When the temperature step change occurs, the current output signal changes to the instrument that is equivalent to the time required for 50% step change, usually expressed when the step response t0.5 temperature transmitter stabilization time of less than Thermocouple When the (resistance) stable thermal response time t0.5 fifth, then use Thermocouple (Resistance) thermal response time as the thermal response time of the instrument; heat temperature transmitter when the step response settling time is not more than Thermocouple (Resistance) thermal response time t0.5 stability of one-half, then the temperature transmitter thermal response time as the thermal response time of the instrument;
The basic error:
The basic error of the meter shall not exceed Thermocouple (Resistance) and synthetic error Temperature Transmitter basic errors.
product name: Explosion-proof thermocouple Product Description: A: Overview
Industrial Explosion Thermocouple , Thermal resistance As the temperature measurement and control sensor and display instrument to directly measure and control the temperature of the production process gases, liquids and vapors.
I plant the production of chemical-specific flameproof Thermocouple , Thermal resistance product Explosion-proof Performance according to the state promulgated 'explosive atmospheres Explosion-proof Appliances' design and manufacturing standards, thermoelectric properties in line with international IEC standards, and by the National Instruments Explosion-proof Safety Supervision Station tested.
Flameproof Thermocouple , Thermal resistance The structure, principle and assembly basically the same way, the main difference is flameproof products junction box (housing) in the design of high-strength aluminum die-casting, and has enough internal space, wall thickness and mechanical strength, rubber seals thermal stability are in line with national Explosion-proof Standard So when an explosive mixture inside the junction box exploded, its internal pressure will not damage the junction box, and the resulting heat can not spread out - Booster product as long as strict compliance with the rules of the user, the product can achieve reliable Explosion-proof effect.
Multiple Explosion-proof form. Explosion-proof Good performance;
Compression spring-type temperature sensing element, anti-vibration performance;
High mechanical strength, good pressure resistance;
Explosion-proof thermocouple Proof principle is the use of space, junction boxes and other components designed to have sufficient strength, all will produce sparks, arcs and dangerous temperature of the components are sealed in the junction box cavity, the cavity when the explosion occurred, through the joints clearance flameout and cooling, after the explosion of flame and temperature not pass outside the cavity, thereby performing explosion.
Four: The main technical parameters
Product performance standards
GB / T16839-1997
JB / T5582-91
Five: temperature insulation resistance
Thermocouple At an ambient temperature of 20 ± 15 ° C, relative humidity less than 80%, the test voltage is 500 ± 50V (DC) insulation resistance between the electrode and the jacket pipe) 1000Ω.m
Six: measuring range and tolerance
Model No. indexing tolerance level III ° C temperature range tolerance value tolerance values
Temperature range ° C
WRN K ± 1.5 ° C -40 ~ + 375 ± 2.5 ° C -40 ~ + 333 ± 0.004ltl 375 ~ 1000 ± 0.0075 ltl