Detail:
The characteristics of
Second tier system output 4-20mA, strong anti-interference ability;
Save the cost of compensating conductor and installing temperature transmitter;
Safe and reliable, long service life;
Cold end temperature automatic compensation, nonlinear correction circuit;
The working principle of
Thermocouple (resistance) in the working state of the measured thermoelectric potential (resistance) changes, through the temperature transmitter of the bridge to produce an imbalance signal, after amplification to become 4-20mA electrical signal to the working instrument, the instrument will show the corresponding temperature value.
Explosion proof thermocouple (resistance) using the principle of the gap between the gap, when the cavity occurs, can through the bonding surface gap and cooling, so that after the explosion of flame and temperature can not pass the cavity, so as to carry out temperature measurement. The thermoelectric potential (resistance) generated by the thermocouple (resistance) is generated by the temperature transmitter's bridge to generate an unbalanced signal, which is converted into a 4-20mA's direct current electrical signal to the worker's instrument, and the work gauge shows the corresponding temperature value.
The main technical parameters
Product implementation standard
IEC584
IEC751
IEC1515
JB/T5518-91
JB/T7391-94
The measurement range and tolerance
1) thermal resistance temperature measurement range and tolerance
The degree of accuracy of the temperature measurement range of type No.
Pt100 -200-+500 WZPB
Class a B
(0.15+0.002ItI)
(ItI 0.30+0.005)
Cu50 Cu100 -50-+100 WZCB (ItI 0.30+0.005)
2) thermocouple temperature measurement range and tolerance
Type number difference, etc.
I II
Allowable differential temperature range for temperature measurement range
K -40-375 1.5, WRNB 2.5, -40-333
0.004 375-1000 ItI 0.0075 333-1200 ItI
N -40-375 1.5, WRMB 2.5, -40-333
0.004 375-1000 ItI 0.0075 333-1200 ItI
E -40-375 1.5, WREB 1.5, -40-333
0.004 375-800 ItI 0.004 333-900 ItI
J -40-375 1.5, WRFB 1.5, -40-333
0.004 375-750 ItI 0.004 333-750 ItI
T -40-125 1.5, WRCB 1, -40-133
0.004 125-350 ItI 0.0075 133-1000 ItI
Output signal: mA 4-20, load resistance 250, transmission line resistance 100
Output method: second line system
Accuracy class:
Temperature transmitter accuracy level: 0.2 0.5 0.1
Display accuracy class: analog indicating type 2.5; digital display type 0.5.
Power supply: 24V.DC + 10 percent
Protection level: IP65
Explosion-proof grade:
BT4 II d CT5 D CT6 D
Intrinsically safe: ia II CT6
Insulation resistance: the insulation resistance between the output terminal of the meter and the case shall be no less than 50
Thermal response time:
When the temperature changes, the current output signal of the meter changes to the 50% time of the step change. It is usually expressed as the thermal response time of the instrument with the thermal response time of the thermal response time of the t0.5. The thermal response time of the instrument is used as the thermal response time of the instrument;
Basic error:
The basic error of the instrument should be no more than the error of the thermocouple (resistance) and temperature transmitter.
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