How It Works
Flow Deflects Paddle
Process fluid moving through the pipe deflects the paddle, rotating the stem against the spring-loaded set point.
Pilot Valve Actuates
When the stem reaches the set point, it actuates the internal pneumatic pilot valve instead of an electrical snap switch.
Air Signal Output
Supply air is routed to the output port, producing a pneumatic signal that can actuate a valve, relay, or control system — no electrical connection needed.
Key Features
No Electrical Wiring Required
The air operated unit replaces the electrical snap-action switch with a pneumatic pilot valve. Supply air in, pneumatic signal out — no conduit, no wiring, no electrical terminations at the switch body.
Identical Flow Sensing Mechanism
The paddle, stem, and flow-sensing mechanism are unchanged from the standard PEECO unit. Set points, paddle sizing, and installation are identical — only the output signal type differs.
Two Supply Pressure Ranges
Available in a low-range (3–20 PSI) version for instrument air systems and a high-range (20–125 PSI) version for plant air or higher-pressure pneumatic control loops.
E Series Explosion Proof Housing
The air operated option is available exclusively on the E Series explosion proof model. The robust cast housing provides the structural integrity required for the pneumatic valve assembly and meets the demands of hazardous area classification.
Typical Applications
Grain elevators & agricultural storage
Paint spray booths & finishing lines
Chemical & petrochemical plants
Offshore platforms & marine environments
Underground mining operations
Grain processing & flour mills
Solvent handling & coating systems
Pneumatic control loops (no electrical infrastructure)
Specify Your Pressure Range
When ordering, specify which supply pressure range matches your pneumatic system. The low range (3–20 PSI) suits instrument air; the high range (20–125 PSI) suits plant air or higher-pressure control loops. Both use standard 1/8–27 NPT tubing connections by default.
Low Range
3 – 20 PSI
Instrument air systems
High Range
20 – 125 PSI
Plant air & control loops
Specifications
| Output Type | Pneumatic air signal |
| Supply Pressure — Low Range | 3 – 20 PSI |
| Supply Pressure — High Range | 20 – 125 PSI |
| Tubing Connection (Standard) | 1/8–27 NPT |
| Tubing Connection (Optional) | 1/4–18 NPT |
| Compatible Series | E Series only (explosion proof required) |
| Ordering Suffix | Specify "Air Operated" and pressure range when ordering |
| Electrical Wiring | None required |