Selection of thermometer for sewage tanks
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The company has a sewage tank that is seven or eight meters deep; it has little corrosive effect on stainless steel. The water level is generally around 5 to 6 meters. To measure the temperature at the bottom of the water, what type of thermometer would be suitable? It should be one that can transmit standard signals over long distances.
A platinum resistor Pt100 can be selected
The question is, as the two people upstairs mentioned, can a thermistor be made that long? To reach the bottom of the pool – I’m facing this problem too right now
I think the original poster could try contacting Pig Brother on the sixth floor.
Those with wires definitely won’t work. Just order a custom armored 8-meter stainless steel PT100. The thermoresistor is used only for temperature measurement at the top; the rest of the part is a wire enclosed in stainless steel. It can be made as long as you want. I’ve seen 10-meter ones.
This post was last edited by cubel on 2016-10-4 at 08:12. It is recommended to use an armored thermoresistor with an insertion depth of over 8 meters; this will ensure that the water temperature measured does not exceed a certain limit. A 304 material will suffice. For remote monitoring, it is advisable to use a transmitter that is integrated into the device; a model with HART functionality could also be considered to enable data collection by the DCS system.
50 is no problem; 200 is a bit challenging. 500 or 5000 in terms of armor protection is practically impossible. However, this doesn’t depend on the depth of the well, but rather on the depth of the water. Since the upper part of the well is filled with air, no armor protection is needed. In fact, that approach is the most suitable and cost-effective.
First, consider the structure of the sewage tank: 1. If installation from the side is possible, a regular armored temperature meter with a transmitter can be used; 2. If installation only from the top is possible, a regular armored temperature meter with a transmitter can still be used； It can also be cable-type; for the cable-type version, it depends on whether fixation at the lower end is required under specific conditions. It’s best to compare the prices of these two options.