Liquid Level Controller

Liquid Level Controller

Forgotten to turn off the tap, leaking washing machines, water level dropping in your aquarium, rain tank or water tank suddenly dry or over flowing, water in your cellar, etc. Such situations are often the cause of trouble and financial burden. Prevention is key, so use this fluid detector. This multifunctional device is easy to use in a variety of applications : 1) LED control of set fluid level : LOW, MIDDLE, HIGH ; 2) Controller : the relay automatically switches a pump and/or valve to keep the fluid level between the LOW and HIGH marks ; 3) Alarm : if the sensor detects a level which is too high or too low (selectable), the relay will operate a bell or other alarm device.


  • Main Board: L: 4-1/8" W: 2-3/8" H: 3/4"
  • Level Board: L: 4-1/8" W: 1" H: 1/16"
  • Power Supply: 12 - 14VAC (min 300mA) orĀ 16 - 18VDC (min 100mA)
  • Relay Contact Ratings: 28VDC@10A, 250VAC@10A, 120VAC@15A
  • Relay has a Normally Open and Normally Closed Contact

Liquid Level Controller Reviews:

  • --> The kit:

    The board is nicely silk screened and of good quality. All parts were present. I do have 2 minor assembly quibles:

    1) There were was a small error in the instructions where it claims the components in the tape are "in assembly order"; there was no order I could perceive. No big deal.

    2) The 3 pin regulator installation position was hard to determine. This is is the one place the silk screening and instructions were unclear. I resorted to looking up the part online and verifying against the schematic.


    o The kit worked as described, and had a good suggestion for increasing the level range detection.

    o The indicator LED's are a good feedback mechanism, and in fact are are used as the test to verify the kit was correctly assembled.

    Things I would have liked to see:

    1) A recommended max length for the sensor wiring, and whether shielding is required for longer lengths.

    2) The sensor board would be more useful if it was wider. This would permit space for a pair of jacks at the top (for the sensor wiring), and enough space for a bracket to mount it. The present width make this awkward.

    3) My application is to control a sump pump, which needs a high power relay. Since I didn't want 117 VAC in my control box, I used the onboard relay and the 12 VDC supply to drive the external relay. A brief mention of the current limits of the 3 pin regulator (which needed a needed a heat sink for the extra 100 mA) would have saved me some searching around.

    Overall, the product does what it claims and I am quite satisfied with the quality and the design.