Industrial explosion-proof platinum resistance is a temperature sensor. Widely used in industrial automatic control system, through the temperature sensor, the temperature parameters of the control object can be turned into electrical signals, transmitted to the display, recording and regulating instrumentation, the system implementation of detection, regulation and control. In the chemical plant, production site is often accompanied by a variety of flammable, explosive chemical gases, vapors, if the use of ordinary platinum resistance is very unsafe, very easy to cause environmental gas explosion. Therefore, in these occasions must use explosion-proof thermocouple for temperature sensor, the factory production of explosion-proof platinum resistance products applicable to the d II BT4 ~ d II CT6 temperature group within the interval of explosive gas hazardous places. The flameproof thermocouple produced by our factory adopts the introduced element as the sensing element, and its technical performance is in line with ZBY301-85 industrial platinum electric technical conditions and indexing table. At the same time, the products meet the general requirements of explosion-proof electrical equipment for explosive environments GB3836.1-83 and GB3836.2-83 standards.
Main technical indicators
Range specification
|
model number |
index number |
Temperature range ℃ |
Accuracy Class |
Allowable deviation △ t ℃ |
|
WZP WZP 2 WZPK WZPK 2 |
PT100 | -200~500 | Grade A | ±（0.15+0.002|t|） |
| Level B | ±（0.30+0.005|t|） |
Note: “ t ” is the absolute value of the measured temperature of the sensing element, double-branched platinum resistors are only supplied with class B RTDs.
Measuring current through the platinum resistor should not exceed 5mA max.
Explosion-proof type and class
Explosion-proof class group: d II BT4 or d II CT4; d II BT6 or d II CT6
Protection class of the housing: IP54,
Principle structure
Explosion-proof RTD and assembled RTD structure, principle is basically the same, the difference is that, explosion-proof products of the junction box (shell) in the design of the explosion-proof special structure, the junction box made of high-strength aluminum alloy die-casting, and has enough internal space, wall thickness and mechanical strength, the rubber sealing ring of the thermal stability in line with the national explosion-proof standards. Therefore, when the explosive gas mixture inside the junction box explodes, its internal pressure will not destroy the junction box, and the resulting heat energy can not be diffused to the outside-explosion transmission.
Due to the above explosion-proof special structure of the product, the product can be used in the range of d II BT4 to d II CT6 explosion-proof temperature group, as long as the user strictly observes the rules of use of the product, the product can achieve reliable explosion-proof effect.
