230V Single Point Level Control Switch for Ammonia

These compact single point level sensors and switches are economical solutions for reliable and accurate level detection. They are designed to detect the presence of liquid (but not oil) at a specific location in vessels containing refrigerant. The computer-compatible, low-voltage signal output of the level sensor can be used directly with plant computers, PLCs, solid-state relays or other controllers. The relay output from the level switch is suitable for direct connection to solenoids, alarms, and computers.

More compact than mechanical float devices, these level devices are very reliable, even in low- temperature systems. Unlike optic devices, they are not affected by film buildup or oil scum. Also, there is no lens to be fooled by frost buildup. They come factory pre-calibrated and tested; ready to use. There are no moving parts in the probe to break, jam, or fail.

Electronics can be easily replaced without pumping out (opening) the system. The single point level switches are an SPDT relay device that can be wired either normally closed or normally open. When there is no liquid at the probe (or the power is off), the N.C. and COM terminals are closed (terminals 5 and 6) and the LED is off. When there is liquid at the probe, the N.O. and COM terminals are closed (terminals 4 and 6) and the LED is on. A maximum wire size of 12 AWG can be used with the wire terminals. This switch is for use only in ammonia refrigeration systems.

There are two voltage capacity sizes available from this product; 115V or 230V. Standard connection is 1/2" MPT.