Pneumatic Switches

Pneumatic-Electric High/Low Alarm Switch

3-15# In - 2 SPDT Out

The switch is used to provide high and low signal alarm. Two independently adjustable SPDT switches provide 3 to 15 psig high and low alarm contact capability in this single device.

Each 10A switch adjustable between 1 and 27 psig

Part # Pneumatic-Electric High/Low Alarm Switch  
R470 2-SPDT P-E Switch Call... Add to Order

Pneumatic-Electric Pressure Switch

3-15# In - Electric Out

For on-off control of electrical devices such as air compressors, fans, pilot lights, etc., by the use of a predetermined air pressure signal.

Part # Switch Differential  
PC-110 SPDT 1 to 5 psi adj. Call... Add to Order
PC-131 DPST Opens On Rise 1-1/2 to 20 psi adj. Call... Add to Order
PC-132 DPST Opens On Fall 1-1/2 to 20 psi adj. Call... Add to Order
PC-141 DPDT 5 psi fixed Call... Add to Order
PC-151 3 SPST Adj. Call... Add to Order

Pressure Controllers

Pressure In - SPDT Floating Out

For the proportional pressure control of steam, air, gases, or liquids.

Part # Range Differential  
PP-221 20" Vac to 10# 1 to 3# Call... Add to Order
PP-222 0 to 20# 1 to 3# Call... Add to Order
PP-223 10 to 60# 2-1/2 to 7-1/2# Call... Add to Order
PP-224 50 to 150# 5 to 15# Call... Add to Order
PP-225 100 to 250# 7-1/2 to 22-1/2# Call... Add to Order
PP-226 216 to 360# 7-1/2 to 22-1/2# Call... Add to Order

Pneumatic Flow Switch

The No. FS7-4A is a variation of the No. FS7-4 which substitutes an air valve for the electrical switch. Can be used to control pneumatic operated relays or valves when flow starts or stops. When flow drops below the necessary rate, the air valve opens, bleeding pressure from the control system.

Part # Pneumatic Flow Switch  
F40EA-1 Johnson Pneumatic Flow Switch Call... Add to Order
FS7-4A McDonnell-Miller Pneumatic Flow Switch Call... Add to Order

Pneumatic–Electric Switches

P67 models are used to make or break 1 or 2 electrical circuits using a pneumatic signal. Typical uses include control of fans, compressors, and other electrical devices.

Part # Switch Range Diff  
P67AA-1 DPST Opens on Fall 3-30# 1-1/2 to 20 Call... Add to Order
P67CA-1 DPST Opens On Rise 3-30# 1-1/2 to 20 Call... Add to Order

Pneumatic Differential Pressure Switch

Low Pressure In - Pneumatic Out

The PDP300 switch senses the flow of air in ducts or where differential pressure exists. Fan interlocking is very common. It includes a bracket for direct or surface mounting.

Part # Pneumatic Differential Pressure Switch  
PDP300 .12 to 2.0" WC-Close High Call... Add to Order
SP401 4" flanged sensing tube, 2 fittings and gasket Call... Add to Order

Air Flow Pressure Switch

Low Pressure In - SPDT Floating Out

These switches are used with reversible electric actuators to control differential pressures, low static pressures, or air velocities in duct systems.

Connection: 3/8'' O.D. Barb

Don’t Forget …
When installing these pressure switches, you’ll need sensing tubes, fittings and tubing.

These switches are designed to be compatible with any brand of pneumatic control system. Replaceable scale plates give you a variety of system functions. Standardizing on these switches will reduce your costs and help you become familiar with a single replacement for all uses.

Part # Range (in WC) Velocity (fpm)  
PF-305 -0.5 to +0.5 400 to 2800 Call... Add to Order
PF-306 0.2 to 1.3 1800 to 4600 Call... Add to Order
PF-307 1.1 to 3.5 4200 to 7500 Call... Add to Order
PF-308 3.2 to 10 7200 to 14000 Call... Add to Order

Universal Pneumatic Gradual Switch

This manual switch is used to provide a variable pneumatic signal to any brand of pneumatic device. Used for remote positioning or as a testing device.

Part # Grad Switch  
HDO-1101 BLANK, Scale plates not included Call... Add to Order
HDO-1102 0 to 100%, Scale plates not included Call... Add to Order
HDO-1103 Increase CW Arrow, Scale plates not included Call... Add to Order
YMC-1001 Pne. Grad. Switch Call... Add to Order

2 Position Pneumatic Selector Switches

This manual selector switch is used to direct one or two signals to either one of two ports. Ten scale plates available to perform a variety of functions. Vented and non-vented models are available.

Part # 2-Pos Selector Switch  
HDO-1201 Occ-Unocc, Scale plates not included Call... Add to Order
HDO-1202 Summer-Winter, Scale plates not included Call... Add to Order
HDO-1203 On-Off, Scale plates not included Call... Add to Order
HDO-1205 Open-Close, Scale plates not included Call... Add to Order
HDO-1206 1-2, Scale plates not included Call... Add to Order
HDO-1207 Day-Night, Scale plates not included Call... Add to Order
HDO-1208 Heat-Cool, Scale plates not included Call... Add to Order
HDO-1209 Manual-Auto, Scale plates not included Call... Add to Order
YMC-2001 DPDT-Non-Vented Call... Add to Order
YMC-2002 DPDT-Vented Call... Add to Order

3 Position Pneumatic Selector Switches

This manual selector switch is used to switch a pneumatic signal to one of three ports. Eight scale plates available to perform a variety of functions. Vented and non-vented models available.

Part # 3-Pos Selector Switch  
HDO-1301 1-2-3, Scale plates not included Call... Add to Order
HDO-1302 On-Auto-Off, Scale plates not included Call... Add to Order
HDO-1303 Day-Auto-Night, Scale plates not included Call... Add to Order
HDO-1305 Heat-Auto-Cool, Scale plates not included Call... Add to Order
HDO-1306 Summ.-Auto-Wint., Scale plates not included Call... Add to Order
HDO-1307 Open-Auto-Close, Scale plates not included Call... Add to Order
YMC-3001 3 Position Non-Vent Call... Add to Order
YMC-3002 3 Position Vented Call... Add to Order

6 Position Pneumatic Selector Switch

This manual selector switch can be used to switch a pneumatic signal to one of six ports. It’s economical cost make it a good choice for any multiple switching function of six or less positions.

Part # 6-Pos Selector Switch  
HDO-1601 1-2-3-4-5-6, Scale plates not included Call... Add to Order
YMC-6001 6-Pos. Non-Vented Call... Add to Order