


Dwyer Instruments HFO-22205 | In-line flow alarm | Range 0.5-5.0 GPM (1-19 LPM) water | 1/2" female NPT
In-Line Flow Alarms, such as the Series HFO, Model HFO-22205, offer constant flow rate level monitoring and control. It is possible to arrange the flow alarm to open or close a contact in response to a rising or falling set point. Available with an aluminum, brass, or 304 SS body with 1/4", 1/2", 1", or 1-1/2" female NPT process connectors.

Free UAE shipping available
- Specifications
- Features
- Downloads
Accuracy | +/-2% FS |
Enclosure Rating | NEMA 4X (IP66) |
Manufacturer | Dwyer Instruments |
Material | Wetted: Body: Aluminum, brass or 304 SS Seals: Buna-N or fluoroelastomer Magnet: PTFE coated Alnico Other internal parts: 304 SS |
Maximum Operating Pressure | Aluminum Body: 600 psig (41 bar) Brass body: 3500 psig (240 bar) 304 SS body: 6000 psig (413 bar) |
Maximum operating temperature | 170°F (76°C) |
Repeatability | +/-1% of FS |
Type | In-Line Flow Alarms |
Type | Switch: SPDT, 10A @ 250 VAC 0.5A @ 125 VDC (resistive) |
Viscosity | 500 SSU |
Weight | Shipping: 1/4 to 1/2" female NPT models: 3 lb (1.4 kg) 3/4 to 1" female NPT models: 4.5 lb (2.0 kg) 1-1/2" female NPT models: 12 lb (5.4 kg) |
- Two 10 A SPDT limit switches are included, along with integral direct reading scales that indicate flow rate locally and field-adjustable alarm settings for application control.
- Greater application flexibility due to the lack of a straight piping requirement for the inlet or outlet and the ability to be installed in any orientation.
- The NEMA 4X (IP65) enclosure and robust cast aluminum design make it suitable for installation in demanding environments or outdoors.
Related Products

Dwyer Instruments HFO-23210 | In-line flow alarm | Range 1-10 GPM (3.8-38 LPM) water | 1/2" female NPT

Dwyer Instruments HFO-23210 | In-line flow alarm | Range 1-10 GPM (3.8-38 LPM) water | 1/2" female NPT

Dwyer Instruments HFO-23202 | In-line flow alarm | Range 0.2-2.0 GPM (0.75-7.5 LPM) water | 1/2" female NPT

Dwyer Instruments HFO-23202 | In-line flow alarm | Range 0.2-2.0 GPM (0.75-7.5 LPM) water | 1/2" female NPT

Dwyer Instruments HFO-22550 | In-line flow alarm | Range 5-50 GPM (19-189 LPM) water | 1-1/2" female NPT

Dwyer Instruments HFO-22550 | In-line flow alarm | Range 5-50 GPM (19-189 LPM) water | 1-1/2" female NPT

Dwyer Instruments HFO-22440 | In-line flow alarm | Range 4-40 GPM (15-151 LPM) water | 1" female NPT

Dwyer Instruments HFO-22440 | In-line flow alarm | Range 4-40 GPM (15-151 LPM) water | 1" female NPT

Dwyer Instruments HFO-22320 | In-line flow alarm | Range 2-20 GPM (7.5-75 LPM) water | 3/4" female NPT

Dwyer Instruments HFO-22320 | In-line flow alarm | Range 2-20 GPM (7.5-75 LPM) water | 3/4" female NPT

Dwyer Instruments HFO-22315 | In-line flow alarm | Range 1-15 GPM (3.8-55 LPM) water | 3/4" female NPT

Dwyer Instruments HFO-22315 | In-line flow alarm | Range 1-15 GPM (3.8-55 LPM) water | 3/4" female NPT

Dwyer Instruments HFO-21123 | In-line flow alarm | Range 4-23 SCFM air | 1/4" female NPT

Dwyer Instruments HFO-21123 | In-line flow alarm | Range 4-23 SCFM air | 1/4" female NPT