Dwyer Instruments SERIES HF Catalog Page
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SERIES HF
IN-LINE FLOW MONITOR
For Air, Water or Caustic Fluids, ±2% FS, Unrestricted Mounting, High Temperature and Pressure Options
FLOW
The Series HF In-Line Flow Monitor is ruggedly constructed and ideal for direct
measurement for a range of compatible gases, oil or water based liquids. This Series
is designed based on a oating orice disk and variable area ow measurement.
Flowing media forces linear motion of the orice disk and a ring shaped magnet which
ride on a tapered center shaft. The transfer magnet drives a clearly visible magnet
follower located outside the ow tube, and a ring on the magnet follower indicates ow
rate on the direct reading scale.
FEATURES/BENEFITS
• This unique design allows accurate performance with uid viscosities up to 500 SSU
• All internal wetted parts are contained inside a sealed metal tubular casing assuring
a virtually maintenance-free unit
• Increased application versatility with no inlet or outlet straight plumbing requirement
and can be mounted horizontally, vertically, or inverted
• Rugged construction allows for high pressure and temperature rating for long
operation life
APPLICATIONS
• Setting pressure relief valves
• Fluid handling equipment
• Detecting low-ow rates for lubricating liquids
• Pulp and paper
• Industrial maintenance
• Fluid power
• Heating loop ow
MODEL CHART - BRASS BODY FOR WATER
BASED FLUIDS (NON-STEAM)
Model
HFB-2-05
HFB-3-15
HFB-3-20
HFB-4-35
HFB-5-50
HFB-5-100
HFB-6-75
HFB-6-150
*Dual scale range
MODEL CHART - ALUMINUM, BRASS, AND STAINLESS STEEL FOR AIR AND
OTHER NON-CORROSIVE GASES
Aluminum
Model
HFA-1-001
HFA-1-002
HFA-1-003
HFA-1-004
HFA-8-001
HFA-8-002
HFA-8-003
HFA-8-004
HFA-2-001
HFA-2-002
HFA-2-003
HFA-2-004
HFA-3-003
HFA-3-004
HFA-3-005
HFA-3-006
HFA-4-003
HFA-4-004
HFA-4-005
HFA-4-006
HFA-9-007
HFA-9-008
HFA-5-007
HFA-5-008
*Dual scale range
Connection
Size
1/2˝ female NPT
3/4˝ female NPT
3/4˝ female NPT
1˝ female NPT
1-1/2˝ female NPT
1-1/2˝ female NPT
2˝ female NPT
2˝ female NPT
Brass
Model
HFB-1-001
HFB-1-002
HFB-1-003
HFB-1-004
HFB-8-001
HFB-8-002
HFB-8-003
HFB-8-004
HFB-2-001
HFB-2-002
HFB-2-003
HFB-2-004
HFB-3-003
HFB-3-004
HFB-3-005
HFB-3-006
HFB-4-003
HFB-4-004
HFB-4-005
HFB-4-006
HFB-9-007
HFB-9-008
HFB-5-007
HFB-5-008
Stainless Steel
Model
HFS-1-001
HFS-1-002
HFS-1-003
HFS-1-004
HFS-8-001
HFS-8-002
HFS-8-003
HFS-8-004
HFS-2-001
HFS-2-002
HFS-2-003
HFS-2-004
HFS-3-003
HFS-3-004
HFS-3-005
HFS-3-006
HFS-4-003
HFS-4-004
HFS-4-005
HFS-4-006
HFS-9-007
HFS-9-008
HFS-5-007
HFS-5-008
Range: Water GPM
(LPM)*
0.5 to 5.0 (1 to 19)
2 to 15 (7.5 to 55)
2 to 20 (7.5 to 75)
5 to 35 (19 to 130)
5 to 50 (19 to 189)
10 to 100 (38 to 379)
8 to 75 (31 to 284)
20 to 150 (76 to 568)
Connection
(NPT female, dry seal)
1/4˝
1/4˝
1/4˝
1/4˝
3/8˝
3/8˝
3/8˝
3/8˝
1/2˝
1/2˝
1/2˝
1/2˝
3/4˝
3/4˝
3/4˝
3/4˝
1˝
1˝
1˝
1˝
1-1/4˝
1-1/4˝
1-1/2˝
1-1/2˝
Range:
SCFM (LPS)*
1.5 to 12 (0.5 to 5.5)
4 to 23 (2 to 10)
5 to 50 (2.5 to 25)
10 to 100 (5 to 45)
1.5 to 12 (.5 to 5.5)
4 to 23 (2 to 10)
5 to 50 (2.5 to 25)
10 to 100 (5 to 45)
1.5 to 12 (.5 to 5.5)
4 to 23 (2 to 10)
5 to 50 (2.5 to 25)
10 to 100 (5 to 45)
5 to 50 (3 to 23)
10 to 100 (4 to 48)
15 to 150 (8 to 56)
30 to 330 (20 to 150)
5 to 50 (3 to 23)
10 to 100 (4 to 48)
15 to 150 (8 to 56)
30 to 330 (20 to 150)
30 to 470 (15 to 220)
150 to 900 (75 to 425)
30 to 470 (15 to 220)
150 to 900 (75 to 425)
Valve
Size
1/8 NPT
1/4 to 1/2 NPT
3/4 to 1 NPT
1-1/4 to 1-1/2 NPT
2 NPT
SPECIFICATIONS
Service: Compatible gases or liquids.
Wetted Materials: HFA: Aluminum casing, Buna-N seals, PTFE coated Alnico
magnet, SS disk; HFB: Brass casing, Buna-N seals, PTFE coated Alnico magnet,
SS disk; HFS: 303 SS casing, FKM seals with PTFE backup, PTFE coated Alnico
magnet, SS disk.
Maximum Viscosity: 500 SSU.
Temperature Limits: 240°F (116°C).
Pressure Limits: HFA, HFB, HFL and HFH models: 600 psig (41 bar) for air and
gas, 3500 psig (241 bar) for liquids; HFS model: 1000 psig (70 bar) for air and gas,
6000 psig (413 bar) for liquids.
Accuracy: ±2% FS.
Repeatability: ±1% of FS.
Shipping Weight: 1/4˝ to 1/2˝ female NPT models; 2 lb (0.9 kg); 3/4 to 1˝ female
NPT models: 3.5 lb (1.59 kg); 1-1/2˝ female NPT models: 11 lb (5 kg); 2˝ female
NPT models: 13.5 lb (6.12 kg).
Note: Series HF monitors are recommended for use with system ltration of at least
74 microns or a 200 mesh screen
MODEL CHART - ALUMINUM BODY FOR OIL BASED
FLUIDS
Model Connection Size Range: Oil GPM (LPM)*
HFL-2-05
HFL-4-25
*Dual scale range
MODEL CHART - 304 SS BODY FOR HIGH-PRESSURE
FLUIDS
Model Connection Size Range: Water GPM (LPM)*
HFS-2-02
HFS-2-10
*Dual scale range
USA: California Proposition 65
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
1/2˝ female NPT
1˝ female NPT
1/2˝ female NPT
1/2˝ female NPT
0.5 to 5.0 (1 to 19)
2 to 25 (7.5 to 95)
0.2 to 2.0 (0.75 to 7.5)
0.5 to 10 (1.9 to 38)
“A”
Reference
1.25
1.875
2.375
3.500
3.500
“B”
Wrench Flats
0.875
1.250
1.750
2.250
2.250
“C”
Reference
4.813
6.562
7.125
10.125
12.625
DWYER INSTRUMENTS, INC.
Variable Area & In-Line
Flowmeters,
259
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