KEY TRADEMARK
KEY PHOTO KEY CUTAWAY
KEY Liquid Level Switch Cutaway view

The KEY is an economical single chamber design float-type, liquid level switch that uses a micro-type switch for the switching operation. NO POTENTIALLY DANGEROUS MERCURY IS USED IN THIS SWITCH! The case and cable are hermetically sealed via re-injection molding (NOT BY GLUEING). The latching ball design provides excellent resistance to nuisance trips due to fluid turbulence. The KEY can be used safely in drinking water or any other fluids that are compatible with the body and cable materials as listed below. The KEY is supplied SPDT for either PUMP UP or PUMP DOWN applications. The differential (inches pumped) can range from as little as 6 inches to 4 feet, depending upon tether length (cable length from tether point to switch end).

KEY with piggyback plug
- The KEY model is now available with a piggyback plug for direct control of small sump pumps up to 1 hp. Contact Techmark for price, model information and delivery.


SPECIFICATIONS

WETTED SURFACES:
Body - polypropylene, Cable - PVC or Neoprene available.

MICROSWITCH SPECS:
Contact rating: 15 amps@ 125/250 VAC 50/60 Hz (UL 90 amps locked rotor test)
Contacts: solid silver
Electrical Life@ maximum load: 100,000 operations
Mechanical Life: 10,000,000 operations
Insulation Resistance: 100 Mohm
Approvals: UL E23301 (N), CSA LR 23413

OPERATING SPECIFICATIONS:
Minimum fluid specific gravity: 0.72
Maximum pressure: 75 psi
Operating temperature range: 32 to 122 deg F (0 to 50 deg C)
Storage temperature range: 14 to 140 deg F (-10 to 60 deg C)

Stock cable lengths: 1, 5, 10, 15 and 20 meters - PVC or neoprene - other lengths available on special order.

ORDERING INFORMATION: model/cable type/cable length in meters - EXAMPLE: KEY/PVC/5mts

DIMENSIONS / OUTLINE DRAWING

INSTALLATION INSTRUCTIONS
Float switch being used for a filling application being used with cable weight. Float switch being used for an emptying application tethered to discharge pipe.
Uses wires: BLACK and BLUE. With these contacts the switch CLOSES when down and OPENS when up. Uses wires: BLACK and BROWN. With these contacts the switch OPENS when down and CLOSES when up.
COUNTERWEIGHT INSTALLATION
1. Insert the cable into the conical bottom of the counterweight. This should cause the plastic ring to become detached. Place the plastic ring (a rubber o-ring or plastic cable tie can be used instead if the plastic ring is missing) on the cable where the pivot point is desired. 2. Force the counterweight on the ring by rotating it and using slight pressure.

FOR PRICING PLEASE CONTACT:

Techmark Corporation
Saint Petersburg, FL
Tel.: 203-272-3559
Fax: 203-272-2053
E-mail:sales@tm-techmark.com