LIQUID SENSOR
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Additional Information
This
Liquid Sensor is fitted with two gold-plated probes. When both probes come into contact with liquid (i.e. when the sensor is submerged) an internal
reed switch closes automatically permitting electricity to flow through the sensor to turn on/off a pump, light, alarm, or
relay.
When the sensor is outside liquid the switch is OFF and electricity cannot flow through it. See image below:
However, when the sensor is submerged in liquid, the switch turns ON and electricity flows through. See image below:
The sensor is made of plastic and can be used in any non-corrosive liquids with the exception of thick oils. It is fitted with a twin-core insulated
1.8 metre long cable - one core with red insulation, and the other black. The liquid sensor should be connected as shown below *:
*
Note that if the sensor is wired the other way around (reverse polarity), the internal switch will be ON whether the sensor is wet or not.
Technical Specifications
This
liquid sensor can handle a switching current of up to
0.5 Amps, the maximum switching voltage is 100 VDC, and the maximum switching capacity is 10 Watts. Where the circuit or appliance to be switched on exceeds any of these limits, a suitable
relay or
transistor should be used.
Alternative Products
Our
Float Switch is an alternative to this
liquid sensor.
Related REUK.co.uk Articles
Learn more about liquid sensors and their limitations compared to float switches
Find out how to use float switches in renewable energy applications
Put together an automatic system to switch off a pump when there is no more fluid left to pump
Put together a fully automatic system to reliably pump out the water collected in a sump pit
A simple circuit to prevent a pump being damaged by being turned on and off rapidly (multiswitching)
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