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In a boiler safety project, we collect 32 thermocouple readings from the depth of a 500MW boiler second pass area, where ambient temperature on a normal day is 65 to 70°C due to hot area leakages in the vicinity. However, the thermocouples need to measure temperatures ranging from 350 to 150°C, depending on their positions.
During a boiler shutdown, we fixed the thermocouples in their strategic places, connected an Arduino Mega board, fixed the LoRa radio with only its antenna sticking outside the IP64 cabinet, and then fixed the box on a post. The 220V AC supply from a nearby pillar was converted through a smartphone adaptor to 5V DC and introduced into the cabinet through a small hole below it.
The two sets of 16 each K-type thermocouples having 32 wires were introduced into the two boxes through side slots, which were then sealed with special insulating putty and m-seal. The thought of providing an LED indication to show health of these devices was turned down as hardly anyone visits the place at this height and high temperature. We finally have two black boxes fixed on a pillar with 32 thermocouple cables entering each box.
Download Source Code
This project will be published in a few weeks. If you want to access it now, refer to Electronics For You’s November 2022 Issue–print or ezine edition.
Somnath Bera is an electronics and IoT enthusiastic working as General Manager at NTPC
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