Hongnuo (shenyang) General Machinery Co., Ltd. is one of the most reliable manufacturers and suppliers of baffle flow switch in China. Welcome to buy high quality baffle flow switch at competitive price from our factory. We also accept customized orders.
Specs at a glance
| Parameter | Value |
|---|---|
| Media | Gas or liquid |
| Pipe size | >25mm (1″ and above) |
| Setting range | See baffle combination table |
| Accuracy | ±2.5% of full range |
| Repeatability | ±2.5% of full range |
| Output | SPDT microswitch (NO + NC) |
For more parameters, please click on "Specifications".
Why baffle type?
1. The simplest way to detect flow
A spring-loaded baffle sits in the pipe. Flow pushes it. When the force overcomes the spring, the baffle moves - triggers a microswitch. No sensors. No electronics. No drift.
2. SPDT microswitch – direct load switching
3A at 250VAC. One switch gives you both NO and NC contacts. Connect it directly to a pump contactor, an alarm lamp, or a PLC input. No intermediate relay needed.
3. 5 baffles included – adjust by swapping, not by turning
No potentiometer, no screwdriver, no software. Different pipe sizes and flow ranges need different baffle combinations. The switch ships with 5 baffle plates. Change the combination – change the setpoint. It's that simple.
Comparison Table – HNF10 Flow Switch Series (Copy-Ready))
| Feature | Thermal (A / AC / B) | Piston (D) | Baffle (E) |
| Principle | Thermal diffusion – heated sensor measures temperature difference | Piston displaces with flow – magnet triggers reed switch | Baffle deflects with flow – mechanical linkage triggers microswitch |
| Output type | Transistor (NPN/PNP) or Relay | Reed switch (dry contact, low current) | Microswitch (SPDT, 3A at 250VAC) – drives loads directly |
| Setpoint adjustment | Potentiometer – field adjustable | Factory set (scale indicated) – fixed | Adjustable – swap baffle plates, not a screw |
| Baffle plates included | Not applicable | Not applicable | 5 plates standard – mix and match for different pipe sizes |
| Pipe size range | Any size (probe insertion) | Any size (probe insertion) | >25mm (1" and above) |
| Pressure loss | Nearly zero | 0.3 bar | 0.08 bar (extremely low) |
| Max pressure | Up to 300 bar | Up to 100 bar | 16 bar |
| Protection rating | IP67 | IP67 | IP33 (indoor use) |
| Wetted materials | Stainless steel (304/316L) | POM / Aluminium / Stainless Steel (model dependent) | Body: Stainless steel / Connection: Brass / Baffle: Stainless steel / Housing: ABS |
Products Description
Large pipe cooling water
Cooling tower and heat exchanger flow monitoring. 0.08bar pressure loss – won't restrict system flow. 3A SPDT output drives alarm or pump control directly.
Pump protection
Pump discharge flow verification. Prevents dry running. SPDT output – use NC contact to stop pump, NO contact for alarm. All in one switch.
HVAC systems
Chilled water and condenser water flow detection. Simple mechanical design – no electronics to fail in damp mechanical rooms. IP33 rated for indoor use.
Industrial equipment
Large machine cooling lines. Standard baffle set covers 1″–6″ pipes. One switch covers multiple pipe sizes – just swap baffles.
Fire protection
Fire sprinkler flow monitoring. SPDT output connects to fire alarm panel. 3A contact rating meets most building code requirements.
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HNF10-E Baffle Type Flow Switch |
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Specific Parameters |
Value / Description |
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Measurement Principle |
It operates based on mechanical principles. The flow of fluid acts upon a baffle supported by a spring. When the flow rate reaches a preset value, the movement of the baffle mechanically triggers a micro switch, thereby generating a switching signal. |
|
Nominal Diameter Range |
Thread 1"-6", other sizes customizable |
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Wetted Parts Material |
Stainless Steel |
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Connection Method |
Threaded Connection |
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Maximum Measurement Error |
±2.5% of Full Scale |
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Measurement Range |
20-1800 L/min |
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Maximum Process Pressure |
16 bar |
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Medium Temperature Range |
Maximum 90 ℃ |
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Ambient Temperature Range |
-25...80°C |
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Transmitter Housing Material |
Unrestricted |
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Display/Operation |
No display |
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Outputs |
Normally Open + Normally Closed (250VAC, 3A) |
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Power Supply |
24VDC / 230 V AC |
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Certificate |
CE ISO9001 ISO14001 ISO45001 |
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Functional Safety |
Functional safety follows the IEC 61508 standard, allowing its use in safety applications as stipulated by the IEC 61511 standard. |
