| Browse： | |
|---|---|
| Add Time： | 2016-08-18 15:58:32 |
| Recommendation： |  |
Product description:
The working principle of
Thermocouple (resistance) was measured by the thermoelectric potential under working conditions (resistance) changes after the bridge temperature transmitter produces unbalance signal, after amplification of 4-20mA converted into electrical signals to the instrument, the working instrument will display the corresponding temperature value.
Flameproof thermocouple (resistance) using the principle of the gap between the explosion, when the cavity explosion, through the joint surface cooling and cooling, so that after the explosion of the flame and temperature can not be transferred to the cavity, so as to carry out temperature measurement. Thermocouple (resistance) thermoelectric power generated (resistance) after bridge temperature transmitter produces unbalance signal, amplified into 4-20mA DC signal to the workers work instrument, instrument showed the corresponding temperature value.
The main technical parameters
Product executive standard
IEC584
IEC751
IEC1515
JB/T5518-91
JB/T7391-94
The measurement range and tolerance
1 thermal resistance temperature range and tolerance
Type index number of the temperature range of the measurement accuracy of the class B (WZPBPt100-200-+500) ± (0.15+0.002ItI) ± (0.30+0.005 ItI) WZCBCu50 Cu100-50-+100 ± (0.30+0.005 ItI)
2 thermocouple temperature range and tolerance
Type index tolerance grade
I II
Allowable temperature range
WRNB K ± 1.5 -40-375 ± -40-333
± 0.004 ItI 375-1000 ItI 333-1200
WRMB N ± 1.5 -40-375 ± -40-333
± 0.004 ItI 375-1000 ItI 333-1200
WREB E ± 1.5 -40-375 ± -40-333
± 0.004 ItI 375-800 ItI 333-900
WRFB J ± 1.5 -40-375 ± -40-333
± 0.004 ItI 375-750 ItI 333-750
WRCB T ± 1.5 -40-125 ± -40-133
± 0.004 ItI 125-350 ItI 133-1000
Output signal: 4-20 mA, load resistance 250, transmission wire resistance 100
Output method: two-wire system
Accuracy grade:
Temperature transmitter accuracy class: 0.1 0.2 0.5
Display accuracy level: analog indicator type 2.5; digital display type 0.5
Power supply: 24V.DC± 10 percent;
Protection level: IP65
Explosion-proof grade:
Flameproof type: D II BT4 D II d II CT6
Intrinsic safety type: ia II CT6
Insulation resistance: the insulation resistance between the output terminal and the shell shall not be less than 50
Thermal response time:
When the temperature step change, change the current output signal of the instrument to the equivalent of the step change time of 50%, said when the temperature transmitter step response time of not more than usually t0.5 thermocouple (resistance) thermal response time of 1/5 t0.5, with a thermocouple (resistance) thermal response time as the instrument thermal response time; when the temperature transmitter step thermal response time does not exceed the thermocouple (resistance) thermal response time of 1/2 t0.5, with a temperature transmitter thermal response time as the instrument of the thermal response time;
Basic error:
The basic error of the instrument shall not exceed the composite error of the basic error of the thermocouple (resistance) and temperature transmitter.
