1080 - Liquid Level Sensor / Rain Alarm

This circuit can be used in a wide variety of applications where a fluid level sensor is required. It can indicate the level of fluid in a container or simply the presence of fluid depending on the way the circuit is used.

The circuit incorporates a relay that can be used to automatically control a pump that will top-up the liquid in the container if it drops below a certain level (or alternatively, drain it if it goes above a certain level). If you need to control liquid between minimum and maximum levels see our other Fluid Level Sensors.

The circuit can also be used as a rain detector alarm (very useful in the UK!) when used with a suitable sensor that you can easily make (see application notes below)

Technical Specifications
Working voltage	12Vdc e.g. Order Code PSU446 with connector 778.106 or kit 1061
Current	60 mA
Output Type	1 x SPDT Relay
Output Load	230Vac, 1A or 110Vac, 2A maximum
Output Connections	NO, NC, C (Relay FAQ)
Board Dimensions	31x57mm
Board Connections	Solder Posts
Product Formats	SELF-ASSEMBLY Electronic Kit (KT ) or PRE-ASSEMBLED Electronic Module (AS) more
Documentation	User Manual Application Notes

• Multilingual instructions supplied (GB,D,F,NL,I,E,H,GR)
• Kit version includes solder for assembly