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Panel or Surface Mounted Pneumatic Timer (Up to 60 Minutes)Item # PT41D

The PT timer is an adjustable precise time delay pneumatic device. The timer is available with an on delay (NC), or an off delay (NO) output. The timer has 1/8 inch NPT ports.

The PT series timer combines a pneumatic timing mechanism with a floating spool valve assembly to provide a wide range of adjustable time control for fluid power systems. The timing assembly, which operates independently of the control pressure, is available in nine different ranges from one tenth of a second to 60 minutes, adjustable by means of a time-calibrated dial. Timing action is initiated by a motor diaphragm operated by a control pressure of from 5 to 140 PSIG.

The timer is equipped with a multi purpose 3 way output valve allowing it to be used as normally open, normally closed or as a diverter.

The PT is designed for panel or surface mounting. Panel mounted versions include a 3 13/16 inch square bezel while surface mounted units are equipped with a bracket for vertical mounting. If required, The PT can be specially calibrated for mounting horizontally.

Off Delay Timer Operation Applying pilot pressure of at least 100ms in duration to the control port shifts the valve. When the pilot pressure is removed, the timing sequence begins. After the timer reaches its set time, the valve switches off. Re-applying the pilot pressure resets the timer and valve.
Item #PT41D
DiagramsOff Delay
PositionVertical Position
Mount TypeStandard Vertical Surface Mount
Timing Range5 to 50 sec.
Operating Pressure Range5 to 140 psi
Connections1/8" NPT ports
Control Pressure5 to 140 psi
MediaFiltered air or non-aggressive gas, non-lubricated.
Output ValveCv - 0.25
Flow at 100 PSI - 9 CFM
Multi purpose 3 way spool
Dial IndicatorDisplays set time
Timing StarOff Delay - Removal of pilot pressure to control port.
ResetOff Delay - Application of pilot pressure to control port.
Reset Time60 ms at 50 psi
RepeatabilityUp to 200 sec. - ± 5%
Over 200 sec. - ± 10%
Time SettingVia dial
Accuracy ± 10% of full scale
OperationTiming cycle uses atmospheric pressure.
MaterialsDiaphragms - Buna N
Zamak Housing
Polycarbonate knob
Aluminum Valve with stainless spool
Operating Ambient-30 to 70 C
-20 to 165 F
Height5 1/4 in.
Width2 1/2 in.
Depth2 1/2 in.
MountingSurface mounted
Drilling Plan (Panel Mount)3 3/16 in. dia. Hole
Port Identification2 - Valve output
1 - System air supply
3 - Exhaust
C - Control Input Signal
OptionsStainless Steel Fitting Mounted
Dial Stop
Tamper Proof Cover
Power ConnectionsFor installations requiring larger output valves, use the standard timer and connect a pneumatically operated single air piloted 3 way or 4 way valve of the size required to the timer output. Contact factory with size requirements.
Typical CircuitsSee typical timing circuit diagrams at the end of the timer catalog section for help in constructing pneumatic timer circuits.