How to set up modular thermal resistors
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This post was last edited by lcd910323 on 2015-7-6 at 13:44. Dear teachers, I am not a professional; I’m just trying to figure out a solution on a temporary basis. I have a simple question: When using PT100 thermistors in accordance with explosion-proof requirements, can they be set up in this way? The temperature-sensing end of the thermoresistor is connected to the object being measured, and three wires lead to the explosion-proof distribution box, within which a temperature transmitter is installed. Question: Does a temperature transmitter require an isolation barrier? Could you recommend some brands of isolation gates? Are there components that combine isolation and transduction functions? If so, could you recommend some brands and models? I hope you can offer your guidance; thank you.
First, what is the explosion protection rating of your thermoresistor? 1. If it is flameproof, there is no need to add a safety barrier. 2. If it is intrinsically safe or not explosion-proof, a safety barrier is required. 3. There are many safety barriers with temperature transmission functions, such as MTL, P+F, Turck, as well as many domestic brands.
1. The temperature transmitter can be equipped with an explosion-proof junction box separately, without the need to incorporate it into an explosion-proof wiring box. 2. Flameproof types do not require isolation barriers, but if protecting the modules and field transmitters is a concern, isolation barriers can be added inside the cabinet. 3. For imported models with transmitter isolation, P+F and MTL are available; for domestic ones, Shanghai Chenzhu is recommended
Thank you, teacher. Are there any recommended manufacturers and models for intrinsically safe thermoresistors?
Thermal resistors are generally chosen to be explosion-proof. As far as I remember, there is no such thing as an intrinsically safe thermal resistor; it’s the temperature transmitters that can be intrinsically safe