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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.
BENEFITS/FEATURES
• 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 Range, Water: GPM, LPM Body Material
HFO-22205
HFO-22315
HFO-22320
HFO-22440
HFO-22550
HFO-23202
HFO-23210
USA: California Proposition 65
WARNING: This product can expose you to chemicals including Lead, which is known to the State
of California to cause cancer and birth defects or other reproductive harm. For more information go
to www.P65Warnings.ca.gov.
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
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
Brass
Brass
Brass
Brass
Brass
304 SS
304 SS
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