Regarding intrinsically safe temperature measurement circuits
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Are there any intrinsically safe integrated temperature transmitters? Why are intrinsically safe temperature measurement circuits usually composed of an armored thermoresistor + intrinsically safe cable + safety barrier? Why not just switch to an integrated temperature sensor?
Yes, when the temperature sensing element and the transmitter are integrated together, it constitutes an integrated temperature sensor. Obviously, it’s the price with the transmitter added.
If an armored thermoresistor is used to form a intrinsically safe circuit, how does it change from a three-wire system to a two-wire system with a safety barrier on the control room side?
Intrinsic safety instruments and intrinsic safety circuits are two different concepts.
Take a look at a safety barrier sample and you’ll understand. Additionally: Thermal resistance elements and thermocouple elements do not have the concept of intrinsically safe explosion protection.
These commonly used options take into account the issues related to the final product. Integrated thermometers come with transmitters, but they are expensive; moreover, the transmitters often have large errors. Under no circumstances should both a thermocouple and a temperature transmitter be used in the same place – it’s a disaster that will only lead to problems in the manufacturing process
The errors of thermocouples or thermal resistors differ from those of temperature transmitters; if devices of different types are installed in the same location, what do you think will be the results of the measurements? How come you’ve never done on-site maintenance?
I thought there were other possibilities. Using on-site temperature changes uniformly simplifies things.
To save money, it’s good for private companies to use temperature-sensitive materials whenever there is no specific requirement
There are no components needed, as it’s already safe enough, but the junction box still needs to be strong enough; who knows, electricity might need to flow through it here or something :D