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| add time： | 2016-01-14 17:17:02 |
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working principle
The electrode of the special thermocouple used in power station is composed of two different conductor materials. When there is temperature difference between the measuring end and the reference end, it will generate the heat potential, the working instrument will show the corresponding temperature value of the thermal electric potential.
Thermal resistance is the use of material in the temperature change, the resistance is also changing with the characteristics of the temperature measurement. When the resistance changes, the instrument will display relevant resistance temperature.
technical parameter
Product implementation standard
IEC584
IEC751
IEC1515
JB/T18622-1997
JB/T8623-1997
GB/T16839-1997
With the continuous development of China's power industry, the need for a variety of temperature measurement of the power station dedicated to replace the imported products. The factory in order to catch up with the international advanced level, and also for the country save foreign exchange, successively from abroad introduced a professional manufacturing technology and equipment, and on the basis of original products, listen to the views of the design institute and power users, the reference to the United States EBASCO specification and redesign of products, increase of new varieties, the whole matching series of varieties, specifications fully meet domestic or imported 30 million, 60 million kilowatts of generating units and other domestic units supporting the needs and its excellent quality to meet the market.
4, measurement range and tolerance
model | Index number | Tolerance level | |||
I | II | ||||
Permissible difference | Measuring range°C | Permissible difference | Measuring range°C | ||
WRN | K | ±1.5°C | -40~+375 | ±2.5 °C | -40~+333 |
±0.004ltl | 375~1000 | ±0.0075 ltl | 333~1200 | ||
WRM | N | ±1.5°C | -40~+375 | ±2.5°C | -40~+333 |
±0.004 ltl | 375~1000 | ±0.0075 ltl | 333~1200 | ||
WRE | E | ±1.5°C | -40~+375 | ±1.5°C | -40~+333 |
±0.004 ltl | 375~800 | ±0.004 ltl | 333~900 | ||
WRF | J | ±1.5°C | -40~+375 | ±1.5°C | -40~+333 |
±0.004 ltl | 375~750 | ±0.004 ltl | 333~750 | ||
WRC | T | ±1.5°C | -40~+125 | ±1°C | -40~+133 |
±0.004 ltl | 125~350 | ±0.0075 ltl | 133~350 |
5, room temperature insulation resistance thermal resistance at ambient temperature of 35 - 15°C, relative humidity is less than 80%, the test voltage of 10 - 100V (DC) electrode and the insulation resistance between the outer sleeve >100Ω.m Thermocouple at ambient temperature is 20 + 15°C, relative humidity is not more than 80%, the test voltage is 500 + 50V (DC) electrode and the insulation resistance between the outer sleeve >1000Ω.m
