Dwyer Instruments SERIES HFO Catalog Page
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SERIES HFO
IN-LINE FLOW ALARM
FLOW
Latching Alarm Capabilities, For Air, Water or Caustic Fluids, Unrestricted Mounting
GPM LPM
20
5
16
4
12
7-1/8
3
1.0 SP. GR.
8
2
FLOW
DIRECTION
3500 PSI/240 BAR MAX
4
1
HFO-XXXX
The Series HFO In-Line Flow Alarm provides continuous monitoring and control of
ow rate levels. The ow alarm can be congured to open or close a contact for an
increasing or decreasing set point. Available in 1/4˝, 1/2˝, 1˝ or 1-1/2˝ female NPT
process connections, in aluminum, brass or 304 SS body.
FEATURES/BENEFITS
• Provides two 10 A SPDT limit switches with eld adjustable alarm settings for
application control and integral direct reading scale provides local indication of ow
rate
• Increased application versatility with no inlet or outlet straight plumbing requirement
and can be mounted horizontally, vertically, or inverted
• Outdoor or harsh environment installation capable with rugged cast aluminum
construction and NEMA 4X (IP65) enclosure
APPLICATIONS
• Waste water processing
• Lubrication systems
• Process control
• Solar systems
• Drain lines
• Pump testing
MODEL CHART - DUAL SCALE RANGE
Model Connection Size
HFO-21112
HFO-21123
1/4˝ female NPT
1/4˝ female NPT
Range, Air:
SCFM, SLPS
2 to 12, 1 to 5.5
4 to 23, 2 to 10
Body
Material
Aluminum
Aluminum
2-15/16
4-1/2
SPECIFICATIONS
Service: Compatible gases or liquids.
Wetted Materials: Body: Aluminum,
brass or 304 SS; Seals: Buna-N or
uoroelastomer; Magnet: PTFE coated
Alnico; Other internal parts: 304 SS.
Viscosity: 500 SSU.
Temperature Limits: 170°F (76°C).
Pressure Limits: Aluminum body: 600
psig (41 bar); Brass body: 3500 psig
(240 bar); 304 SS body: 6000 psig (413
bar).
Enclosure Rating: NEMA 4X (IP66).
Accuracy: ±2% FS.
Repeatability: ±1% of FS.
Switch Type: SPDT, 10 A @ 250 VAC;
0.5 A @ 125 VDC, (resistive).
Shipping Weight: 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).
MODEL CHART
Model Connection Size
HFO-22205
HFO-22315
HFO-22320
HFO-22440
HFO-22550
HFO-23202
HFO-23210
1/2˝ female NPT
3/4˝ female NPT
3/4˝ female NPT
1˝ female NPT
1-1/2˝ female NPT
1/2˝ female NPT
1/2˝ female NPT
Range, Water:
GPM, LPM
0.5 to 5.0, 2 to 19
1 to 15, 5 to 55
2 to 20, 10 to 74
4 to 40, 20 to 150
6 to 50, 20 to 190
.2 to 2, 1 to 8
1 to 10, 3 to 37.5
Body
Material
Brass
Brass
Brass
Brass
Brass
304 SS
304 SS
USA: California Proposition 65
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
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