Float Switch


SUPERFREEZE Float switch, type 38SFS is an electro mechanical float switch designed to provide a reliable, electro- mechanical response to liquid level changes. The simple and rugged design ensures long life performance and reliable operation for many usages such as,

  • Level control by liquid fill solenoid valve
  • High-level cut-out or alarm
  • Low-level cut-out or alarm
  • Low-level pump cut-out
  • Level control by liquid exit solenoid valve
  • Level indication by pilot light
  • Transfer drum operation

The design incorporates a mechanical float which will operate in the refrigerant. When the set level is reached an electrical volt free micro switch will be activated.


  • Based on SUPERFREEZE float type 38SLC
  • DIN, ANSI and FPT / NPT flanges
  • Switch assembly can be rotated at 360` for easy installation.
  • Adjustable liquid level differential switch point
  • Electromagnetic micro switch, mechanically activated.
  • The complete switch box can easily be replaced with out any interference with refrigeration system
  • Switch box supplied with DIN plug for ease of installation and service
  • Counter flanges are included.


Refrigerants : R-717 (Ammonia), R-12, R-22, R-502 etc.
Safe operating pressure : 406psig (28bar)
Operating temperature range : -50oC to +65oC.
Liquid level differential : variable between 12.5mm to 50mm (1/2″ to 2″) in 12.5mm (1/2″) increments
Normally Open (NO) and Normally Closed (NC) function
Enclosure : IP65


  • Liquid over-feed accumulators.
  • Flooded surge drums
  • Flooded shell & tube chillers
  • High and low pressure receivers.
  • Intercoolers
  • Use as low/high level safety switch to protect circulating pumps / compressors.