Level control of sewage tanks containing mud and oil
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There is an existing sewage tank whose liquid level needs to be measured. The sewage temperature ranges from 60 to 70 degrees, it contains sludge, and there is an oil layer on the surface; the thickness of this oil layer varies, reaching up to 60 mm at its maximum. Alarms are required for both high and low levels. Originally radio frequency admittance was used, which often leads to false alarms; seeking help.
The cause of the false reading is oil or sludge sticking to the electrodes, which creates additional capacitance and resistance. To make improvements, it is sufficient to use electrodes with protective sleeves and a measurement amplifier, or opt for an ultrasonic level gauge
To use it economically, I think it’s better to use the immersion type
Continuous measurement is not required; only high and low level alarms are needed. Two thermistors can be installed directly, preferably armored ones, or float-type level switches can also be used
This post was last edited by kenpy on 2011-2-23 02:46. This situation isn’t easy