Product description:
application
Usually and display meter, recording meter, electronic computer etc., 4-20 ma output, direct measurement of carbon production site of chlorine and other explosives - 200 ℃ to 1300 ℃ range of liquid, steam, gas and solid surface temperature.
The characteristics of
4-20 ma two wire output, strong anti-interference ability;
Save the compensation conductor and temperature transmitter installation cost;
Save a large range;
The cold end temperature automatic compensation, nonlinear correction circuit;
The working principle of
Thermocouple (resistance) in the working status of the change of the thermoelectric potential (resistance), after the temperature transducer of bridge produce unbalance signal, after amplification into 4-20 ma electrical signal to the instrument, the instrument will display the corresponding temperature value.
Flame-proof thermocouple (resistance) using the clearance flame-proof principle, when an explosion cavity, can remove from heat and cooling by joint clearance, the explosion flame temperature and not reach outside the cavity, thereby for temperature measurement.Thermocouple (resistance) produce thermoelectric potential (resistance) after temperature transmitter of bridge produce unbalance signal, after amplification into 4-20 ma dc signal to workers instrument, the instrument shows the corresponding temperature value.
The main technical parameters
Product standards
IEC584
IEC751
IEC1515
JB/T5518-91
JB/T7391-94
Measuring range and tolerance
1) thermal resistance temperature measurement range and tolerance
| Type no. | Degree, | measuring℃ temperature range | finegrade | Allowable deviation |
| WZPB | Pt100 | - 200 - + 500 | A gradeBlevel | ±(0.15+0.002ItI) ±(0.30+0.005 ItI) |
| WZCB | Cu50 Cu100 | + 100-50 - | ±(0.30+0.005 ItI) |
2) thermocouple temperature measurement range and tolerance
| Type no. | pointsC no. | Tolerance level | |||
| I | II | ||||
| Tolerance values | ℃ temperature range | allowdifference | Temperature measurement range | ||
| WRNB | K | Plus or minus 1.5 ℃ | - 40-375. | Plus or minus 2.5 ℃ | - 40-333. |
| ±0.004 ItI | 375-375. | 0.0075 ItI | 333-333. | ||
| WRMB | N | Plus or minus 1.5 ℃ | - 40-375. | Plus or minus 2.5 ℃ | - 40-333. |
| ±0.004 ItI | 375-375. | 0.0075 ItI | 333-333. | ||
| WREB | E | Plus or minus 1.5 ℃ | - 40-375. | Plus or minus 1.5 ℃ | - 40-333. |
| ±0.004 ItI | 375-375. | 0.004 ItI | 333-333. | ||
| WRFB | J | Plus or minus 1.5 ℃ | - 40-375. | Plus or minus 1.5 ℃ | - 40-333. |
| ±0.004 ItI | 375-375. | 0.004 ItI | 333-333. | ||
| WRCB | T | Plus or minus 1.5 ℃ | - 40-125. | + / - 1 ℃ | - 40-133. |
| ±0.004 ItI | 125-125. | 0.0075 ItI | 133-133. | ||
Output signals: 4-20 mA, 250, load resistance transmission conductor resistance in 100
Output method: two wire
Precision level:
Temperature transmitter precision grade: 0.1 0.2 0.5
Display precision level: analog indicating 2.5 on the Richter scale;0.5 digital display type.
Power supply: 24 v DC + 10 ℅
Protection grade: IP65
Explosion-proof level:
Flameproof: d Ⅱ BT4 d Ⅱ CT5 d Ⅱ CT6
Intrinsically safe: ia Ⅱ CT6
: insulation resistance meter output terminals between shell and insulation resistance shall be not less than 50.
Thermal response time:
When the temperature appear step change, the instrument of current output signal changes to correspond to the step change of 50% of the time required, usually with t0.5 said when the temperature transmitter does not exceed the stable step response time of thermocouple (resistance) thermal response t0.5 five points at that time, stability time with thermocouple (resistance) thermal response time as the instrument of thermal response time;When the temperature transmitter of the step stable thermal response time is less than the thermocouple (resistance) half of the time stability of thermal response t0.5, temperature transmitter thermal response time is used as the instrument of thermal response time;
The basic error:
The instrument shall not exceed the basic error thermocouple (resistance) and composite error of temperature transmitter basic error.
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