Dwyer Instruments Series HF Installation and Operating Instructions
BULLETIN F-55
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Series HF IN-LINE Flow Monitors
Specifications - Installation and Operating Instructions
Series HF Flow Monitors combine the simplicity of a
sharp edged orifice disk with a variable area flow
monitor to provide a low cost way to measure flow at
high pressures. These monitors are tubular, with all
internal wetted parts sealed within the body casing.
Running through the body is a tapered shaft which is
centered in the bore by pilot disks at each end.
Surrounding the shaft are a sharp-edged floating
orifice disk, a transfer magnet and return spring. The
disk and transfer magnet are held in the “no flow”
position by a biased return spring. As flow moves
through the monitor, it creates a differential pressure at
the orifice disk forcing the disk and transfer magnet
against the return spring. As flow increases, the
differential pressure at the disk increases, forcing the
disk and transfer magnet to move along the tapered
center shaft. As flow decreases, the biased return
spring forces the disk and transfer magnet down the
center shaft, returning to the “no flow” position. In metal
casing monitors, disk and magnet movement are not
visible so a magnet follower is located outside the body
casing, magnetically coupled to the internal transfer
magnet. As flow increases, motion of the internal
magnet moves the magnet follower outside the body
casing, under the scale.
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: Body: Aluminum, brass or 304 SS;
Seals: Buna-N or Fluoroelastomer; Magnet: PTFE
coated Alnico; Other internal parts: 304 SS.
Maximum Viscosity: 500 SSU.
Temperature Limits: HFA, HFL, HFB and HFS
Models: 240°F (116° C); HFH Models: 400°F (204°C).
Pressure Limits: HFA Models: 600 psig (41 bar);
HFL, HFB and HFH Models: 3500 psig (240 bar);
HFS Models: 6000 psig (413 bar).
Accuracy: ±2% FS over entire range.
Repeatability: ±1% of full scale.
Shipping Weight: 1/8 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).
“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.
Aluminum body for air or other non-corrosive gases:
Wetted Parts: Aluminum, PTFE coated Alnico, 304 SS and Buna-N
Connection
Model
HFA-0-01
HFA-1-12
HFA-1-22
Aluminum body for oil based fluids:
Wetted Parts: Aluminum, PTFE coated Alnico, 304 SS and Buna-N
Model
HFL-2-05
HFL-4-25
Brass body for water based fluids (non-steam):
Wetted Parts: Brass, PTFE coated Alnico, 304 SS and Buna-N
Model
HFB-0-01
HFB-0-02
HFB-2-05
HFB-3-15
HFB-3-20
HFB-4-35
HFB-5-50
HFB-5-100
HFB-6-75
HFB-6-150
304 Stainless Steel body for high-pressure fluids:
Wetted Parts: 304 SS, Fluoroelastomer and PTFE
Model
HFS-0-01
HFS-2-02
HFS-2-10
Size
1/8˝ female NPT
1/4˝ female NPT
1/4˝ female NPT
Connection
Size
1/2˝ female NPT
1˝ female NPT
Connection
Size
1/8˝ female NPT
1/8˝ female NPT
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
Connection
Size
1/8˝ female NPT
1/2˝ female NPT
1/2˝ female NPT
Range, Air
SCFM
2-12
2-12
4-23
Range, GPM
Oil
0.5-5
2-25
Range, GPM
Water
0.05-1
0.2-2
0.5-5
2-15
2-20
4-40
5-50
10-100
8-75
20-150
Range, GPM
Water
0.05-1
0.2-2
0.5-10
Max. Pressure
Drop, PSID
3.32
3.32
3.61
Range, LPM
Oil
1-19
7.5-95
Range, LPM
Water
.19-3.8
.75-7.5
1-19
7.5-55
7.5-75
19-130
19-189
38-379
31-284
76-568
Range, LPM
Water
0.19-3.8
0.75-7.5
1.9-38
Max. Pressure
Drop, PSID
6.08
8.41
Max. Pressure
Drop, PSID
1.98
5.58
7.18
10.2
6.2
15.2
9.25
25.59
14.95
39.86
Max. Pressure
Drop, PSID
1.98
5.58
8.68
Brass Body High Temperature 400˚F for water based fluids:
Wetted Parts: Brass, PTFE coated Alnico, 304 SS and Fluoroelastomer
Model
HFH-2-05
HFH-2-10
HFH-4-35
READING THE MONITOR
Note the red reference line running 360° around the
white magnet follower. This line moves in direct
proportion to the movement of the internal orifice disk.
When fluid is flowing, the flow rate is read by aligning
the red reference line with the closest scale graduation.
SPECIFIC GRAVITY OR DENSITY EFFECT
Standard water monitors are calibrated with water and
oil monitors are calibrated with .873 S.G. oil. Flow
indication will read high for heavier fluids and low for
lighter fluids. A correction factor for other specific
gravities can be established using the following
formulas.
Connection
Size
1/2˝ female NPT
1/2˝ female NPT
1˝ female NPT
Range, GPM
Water
0.5-5
1-10
5-35
Range, LPM
Water
1-19
3.8-38
19-130
Max. Pressure
Drop, PSID
7.18
8.68
13.46
For Water Monitors use:
Actual = Observed Reading x 1.0
For Oil Monitors use:
Actual = Observed Reading x 0.873
VISCOSITY EFFECT
The Series HF Flow Monitor incorporates a unique
floating sharp-edged orifice disk which provides greater
operating stability and accuracy over wide ranging
viscosities up to 500 SSU.
√
√
S.G.
S.G.
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