For general purpose applications where high sensitivity is required and moderate or low flow rates are encountered such as air conditioning, heating and hydronic systems, water, fuel oil, some viscous liquids and oils in process work

For heavy duty applications where high sensitivity is required, such as water treatment systems, cooling systems for electronic circuits, compressors, booster pumps, and bearings, and other applications that need instant switching.

Designed to serve the widest variety of applications , it is used for starting or stopping electrically operated equipment such as signal lights, alarms, motors, automatic burners, metering devices and others.

For general purpose applications requiring low flow rate sensitivity , its in-line configuration eliminates the need for a pipe tee. With a single pole, double throw snap switch, its sensitivity adjusting screw also makes flow adjustment easy.

Designed for hazardous environment applications requiring a NEMA 7 (Class I, Group C or D) or NEMA 9 Class II, Group E, F, or G) rated flow switch, it has a single pole, double throw snap switch, with a magnetic switching mechanism.

For general purpose applications with environmental exposure , or those requiring a water-tight, dust tight, or a NEMA 4X rated flow switch.

The Series AF provides a positive and economical way to detect change or loss of air-flow velocity caused by a closed damper or fan inlet, a loose fan wheel, etc. The Series AF1 is designed for medium and higher velocity systems, while models AF2 and AF3 are for systems with lower air-flow velocities.

The series RB-24, RB-120 and RB-122 low water cut-offs guard against the dangers of low water conditions in residential hot water boilers. These UL â -listed, conductive-type water detection controls feature a quick-mount probe for easy installation, inspection and replacement.

For residential and commercial applications, the Series PS-800 low water cut-offs (24v or 120v) are designed for steam boilers up to 15 psi or hot-water boilers up to 160 psi, 250 ° F.

For residential, commercial and industrial applications, the Series-850 is designed for hot water boilers with a totally electronic operation, with the feature of no lock out with the loss of power if the probe is in water.

For commercial and industrial applications, the Series 750 features electronic circuitry with remote conductance probe level sensing. Maximum ambient temperature of 12 0 ° F and voltage across probe to ground of 14 VAC.

The series RB-24, RB-120 and RB-122 low water cut-offs guard against the dangers of low water conditions in residential hot water boilers. These UL â -listed, conductive-type water detection controls feature a quick-mount probe for easy installation, inspection and replacement.

For residential and commercial applications, the Series PS-800 low water cut-offs (24v or 120v) are designed for steam boilers up to 15 psi or hot-water boilers up to 160 psi, 250 ° F.

For residential, commercial and industrial applications, the Series-850 is designed for hot water boilers with a totally electronic operation, with the feature of no lock out with the loss of power if the probe is in water.

For commercial and industrial applications, the Series 750 features electronic circuitry with remote conductance probe level sensing. Maximum ambient temperature of 12 0 ° F and voltage across probe to ground of 14 VAC.

Low Water Cut-Offs for Steam Boilers
The Series 93 is designed to maintain consistent water level, regardless of pressure, for commercial and industrial low- or high- pressure steam boilers of any capacity. Maximum pressure 150 psi and No. 5 switch included.

Low Water Cut-Offs for Steam Boilers
The Series 150 Float-Type Low Water Cut-Off Control is designed for boiler applications up to 150 psi.

The Series LPC 2000 is used for industrial and commercial level sensing and pump control of cooling towers, tanks, water fountains, condensate units, and others. It utilizes digital technology utilizing a micro-controller, and has a field selectable control unit allows for single or multi-level sensing. Also, it directly switches a 1 HP motor, and has a time delay feature that prevents process disturbances from water level surges.

For sophisticated multi-level control in tanks, boilers and hydronic systems. Features Teflon ¨ coated probes to provide protection from false signals. No blow down required. Control enclosures are NEMA 1-rated and remote sensors are NEMA 4-rated. Optional Features include manual reset switch, alternate pump switch and 28-volt probe.

Make-Up Water Feeder
The Series 21 is a feeder designed for boiler receiver tanks, whose direct mount eliminates the need for equalizing connections. Its soft seat provides positive seal and the maximum water supply pressure is 150 psi.

The Series PFC is designed for proportional control of pneumatic valves or relays in heating, air-conditioning and process systems in hazardous or non-hazardous locations. It provides an air pressure signal proportional to the liquid level, and it is available in Direct Acting and Reverse Acting versions. The maximum water temperature is 208 ° C.

The Series VFS is a general-purpose NEMA 1-rated liquid level control for a variety of industrial and commercial applications such as boilers and tanks, high and low alarms and pumps. It can also be used in pairs to start and stop auxiliary equipment between desired levels.

Selection Guide for Liquid Flow Switches

Liquid Flow Switch K Factors

Selection Guide

AF1, AFE-1, AF2, AF3

T5R, T20