The simplest device that can detect airflow. If the cubic feet per minute output of the blower is known, the air velocity can be found by dividing the cubic feet per minute by the area of the duct in square feet. The vane of the Model 103B switch is marked with lines outlining the area of the vane used to detect air flow of 500 to 2,500 feet per minute. The Model 103B SPDT is now also available with gold contacts for use with low voltage and current. Click on above blue lettering for additional information and product literature sheets.
This is the smallest switch that can actuate on pressures as low as 0.02" W. C.. However, they are normally set to operate from 0.05" to 1.5" W.C. to detect air flow of 900 to 5,000 feet per minute. The diaphragm must be in a vertical plane to cancel the pull of gravity. The diaphragm is 0.002" thick silicone rubber that allows a 1% of full scale accuracy over a temperature range of -40° to +120 ° F. The switch can be purchased with N.C. gold contacts for use with low voltage and current. It is also available for A.C. voltages, where it is placed in series with the load across the voltage source. The switch also can be supplied for D.C. supply voltages. Click on above blue lettering for additional information and product literature sheets.
This is an all metal body switch used in a large number of military applications. It is manufactured in three different sizes to cover the range of 0.05" to 7" W.C. to detect airflow of 900 to 13,000 feet per minute. The Model D is supplied with a single pole double throw snap action switch listed by UL and rated at 4 amperes, 250 volts AC, 28 volts, 5 amperes resistive and 3 amperes inductive. Can also be supplied with gold plated contacts for use with low voltage and low current. Switches will withstand high pressure overloads. Complies with many Military Specifications. Click on above blue lettering for additional information and product literature sheets.
This switch can be activated by 0.005" W.C. and up. It is the most sensitive simple diaphragm switch obtainable. It has a dial setting that is calibrated for each unit to a primary standard. Many users connect a lamp load across the contacts and use it as a low cost means of determining what value of inches of water column they have in their system. The Model LPS100-0.5 (lowest range switch) does not use a micro switch. It uses an electronic circuit where the load can be 8 amperes, 120 volts, 60 AC. The load is connected in series with the power source and then connected across the switch terminals. Custom built units with N. C. gold contacts for use with low voltage and current are available. Switches with higher operating ranges use micro switches. This switch can be custom built without housing, etc. to obtain minimum cost for large quantity applications. Click on above blue lettering for additional information and product literature sheets.
This switch was specifically designed for packaged steam generators. It is a safeguard to prevent flow of fuel when a hazardous condition is present due to a lack of forced draft. Switch is adjustable over a range of 0.1 to 0.5 inches water column. A maximum pressure of 16 inches water column can be applied to the switch without changing the pressure or differential values. The switch can be operated in an ambient temperature up to 130° F. Click on above blue lettering for literature.
This switch is our most popular high quality unit. It has an extended range of 0.05" to 8.0 " water column, which results in a single switch covering what normally would require three or more different range switches from other manufacturers. It is unique in that it uses a compression spring for the low ranges and a flat clock spring for the high ranges. Housing is sealed, dustproof, oil tight and waterproof for outdoor use. Epoxy finish is acid resistant. High strength zinc die castings are used and combined with extra precautions, such as not using self-tapping screws, makes for a more rugged product. These units have been tested to meet Navy Shock test MIL-901D, vibration and post-vibration testing per MIL-STD-167-1; Type 1. Click on above blue lettering for literature.
This switch was specifically designed for package steam generators to detect if there was enough air pressure for atomizing fuel for proper combustion. Reliable and convenient, Model 161P series is used where a single action diaphragm switch controls air pressure. The switch may be used whenever the media in use is not harmful to the neoprene diaphragm employed. Ease of mounting is accomplished by using the 1/4" NPT male pressure connection. Click on above blue lettering for literature.