Instrument selection: Instrumentation for measuring humidity inside storage tanks
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There is a storage tank on site, with a dome and a conical base. The contents inside are small powder particles. Purged with slightly positive nitrogen pressure, temperature: -20°C to 50°C. I now want to measure the humidity of the gas inside the tank, with an output of 4–20mA. Could everyone give some suggestions?
Well, won’t a plug-in thermistor with temperature sensing work?
On Taobao or Alibaba, search for “temperature transmitter module 4-20ma”; it should indicate that a gauge needs to be used along with it
Bro, I want to measure humidity, not temperature! ;P
I really didn’t see it clearly; I’m sorry. I’ve never measured humidity before, but it seems that most people refer to it as the dew point.
A thermistor that can detect temperature changes can actually be used to measure humidity – could you explain the principle behind this?
Firstly, it depends on the humidity level inside your tank. If the humidity is very low, an analyzer for trace amounts of moisture in the air can be used; however, due to the dust present in the material inside the tank, it may be necessary to take samples, circulate them, and then measure after filtering. Additionally, a laser gas analyzer can be used; Focus Technology manufactures such analyzers, which have a wide measurement range and can be installed directly on the tank wall.
There are specialized temperature and humidity transmitters available. If the requirements are not high, there are many such options on Taobao; for higher demands, Rochelec products can be chosen. It’s important to pay attention when making a choice – some of these transmitters can withstand condensation, while others cannot. It is recommended to opt for those that can resist condensation