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Water Level Probes

Mostly temperature sensors are used for following purposes in vending machines.

For ambient measurement a thermister would be ideal. Mounting it with a spacer (to separate it from the wall) on a wall is the normal method

For steam / hot water temperature measurement, the sensor can be mounted in a variety of ways.

The the mounting methods 2 & 3 we also face an additional problem. In case you use water with some hardness, then the salt deposition on the insides of the boiler will reduce the resposiveness of the sensor – the sensor will sense a lower temperature than what is actual. This is possibly the price we pay to use a lower cost mounting solution!!!

The most common method of mounting sensors in low cost premix based hot beverage machines is the 3rd method above.

To acheive maximum performance in this method, the following precautions need to be taken.