S-9400LL-series Henry Liquid Level Switch

The level switch can be installed in a number of locations in the refrigeration system such as liquid receivers, suction line accumulators and compressor crankcases. The range is designed for use with HCFC, HFC and ammonia refrigerants, along with their associated oils. A 1" NPT level switch is recommended for ammonia applications
How it works:
The S-94 series electronic level switches use infrared light reflecting from a conical glass prism as a means of detecting the absence of fluid at the level of the glass cone. An integral part of the switch is an infrared module, containing a light emitter and receiver. When no fluid covers the lower half of the cone, infrared light from the emitter reflects from the inner surface of the cone back to the receiver. This signals the module to switch. When fluid covers the lower half of the cone, the light from the emitter disperses into the fluid. The resulting absence of reflected light is detected by the receiver and the module switches in the opposite direction.

Main Features:

• Patented optical sensor technology
• Robust design
• Serviceable without refrigerant loss
• No moving parts
• Fused glass hermetic seal
• Flying leads and DIN connector options