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MDI mercury contactors/relays are durable and float switches and liquid level controls for water and sewage Liquid Level Control Floats
Contactors and Solid State Relays,
Tilt, Tip-over and Proximity Switches
Motion and Shock Sensors.
MDI Mercury Displacement Industries Relays, Contactors, Liquid Level Control Floats, Tilt and Tipover switches
Relay, Vertical, Liquid Level Control Floats, Tilt and Tipover switches
Water Alarm Installation Guide


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Warning: Disconnect power source prior to installing or servicing of the alarm. This alarm is to be installed by a qualified person in accordance with the local, state and national codes. THE LEVEL ALARM MAY ONLY BE INSTALLED INDOORS.

Be sure to follow National Electric Code, ANSI/NFPA 70, when installing this unit to prevent moisture from entering or building up inside equipment.

Installation Instructions

Installing Water Alarm

  1. Install 9V battery (not included). Replace battery once a year.
  2. Select an indoor mounting location.
  3. Install a mounting screw in the wall at the desired height and slip keyhole on the back of the box onto the screw and pull down.
  4. Use another screw to fasten bottom mounting cleat to the wall.
  5. Use cable tie supplied in the box to secure the float switch at the desired warning level in the tank (see diagram). Cut off excess material left from cable tie and discard.
  6. Now manually test the alarm by tilting the float switch up until you hear the alarm notification and you see the alarm light turn on.
  7. Periodically test unit by pushing the test button on the cover to make sure the unit is working properly.
Test alarm installation by pressing TEST button on the front of the alarm panel, The light and siren should activate. This test reflects there is electricity to the alarm. The float circuit may be checked by manually raising the float upward past 90 Deg. to the discharge pipe. With the alarm switch in the alarm position, the alarm should give a visual and audible alarm.

WARNING: FAILURE TO FOLLOW INSTRUCTIONS MAY RESULT IN SERIOUS PERSONAL INJURY OR DEATH. REFER TO THESE INSTRUCTIONS ANY TIME THE UNIT IN DISCONNECTED FOR ANY REASON

! WARNING
SHOCK!
ELECTRICAL SHOCK HAZARD
disconnect power before installing or servicing this product, a qualified service person must install and service this product. according to applicable electrical & plumbing codes.

! WARNING
Explode!
EXPLOSION OR FIRE HAZARD
Do not use this product with flammable liquids. do not install in hazardous locations as defined by national electric code, ansi/nfpa 70.

For Liquid Level Control Floats, Contactors and Solid State Relays, Tilt, and Tipover contact MDI TODAY!

* P. O. Box 710 * 25028 U.S. 12 East * Edwardsburg, Michigan * 49112 *
* PH. (269) 663-8574 * FX. (269) 663-2924 *
* Toll Free US and Canada (800) 634-4077 *