Paquin is spotlighting our P397 Piston Flow Switch, a compact, reliable inline flow switching for liquids and gases, designed to deliver repeatable switching with minimal pressure loss in demanding industrial environments.
Built for: HVAC, lubrication, and cooling systems plus compressors, CNC, and general fluid control
Measures: Flow presence and threshold switching from 0.16 to 18.5 GPM (26 GPM Max)
Options: Aluminum or stainless housings, NPT/G ports, optional LED indication, and M12 connectivity
The Problem The P397 Solves
When a pump, compressor, cooling loop, or lube circuit loses flow, downtime (and damage) can follow fast. P397 provides a simple, robust way to confirm flow and trigger alarms/interlocks—without adding unnecessary restriction to the line.
What’s New / Why It’s Different
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Inline piston design actuates a hermetically sealed reed switch for dependable switching
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Low pressure loss: average 4.35 PSI @ 6.6 GPM supports energy-efficient operation
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Industrial flexibility: works with liquids and gases, with ¼″–1″ NPT or G female connections
- Troubleshooting-friendly: optional 24 VDC LED indicates switch state
Applications
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Compressor systems, air conditioning systems (HVAC)
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Machine manufacturing and CNC machines
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Cooling systems, lubrication systems, hydraulics, and water systems
Key Specifications (snapshot)
| Parameter | Value |
|---|---|
| Flow monitoring range | 0.16 to 18.5 GPM |
| Repeatability | 5% |
| Hysteresis | setpoint-dependent; minimum noted 0.132 GPM |
| Output | Reed switch (24 VDC, 1A) |
| Protection class | IP65 |
| Media temperature | Max 194°F (90°C) |
| Pressure rating | Aluminum: 725 PSI (50 bar); Stainless: 1450 PSI (100 bar) |
| Current | <50 mA |
| Max pressure | 435 psi (30 bar) |
| Pressure loss | Avg 4.35 PSI @ 6.6 GPM |
| Electrical connection | M12 x 1 |
| LED option | With LED (requires 24 VDC) or without LED |
Ordering & Availability
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Model: P397; select flow ranges dependent on nominal pipe diameter, housing material, medium, switch logic, and mating connector assemblies (see "Build Your Part Number").
Download the data sheet (for full technical parameters and dimensions of the P397)
Visit the product page & request a quote - our team will help you select your exact build.