Dwyer Series HF In-Line Flow
Sensors |
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 Low Cost,
Durable Flow Monitors have a patented design based on a
floating sharp-edged orifice disk and variable area flow measurement
to yield accuracy of ±2.5% over center one-third of scale.
This unique design allows accurate performance with fluid viscosities
up to 500 SSU. All internal wetted parts are contained inside
a sealed metal tubular casing assuring a virtually maintenance-free
unit. Flowing media forces linear motion of a spring loaded,
sharp edge orifice disk and ring shaped transfer magnet which
both ride on a tapered center shaft. The transfer magnet drives
a clearly visible magnet follower located outside the flow
tube, protected under the clear Lexan® tube. A ring on the
magnet follower indicates flow rate on the direct reading scale.
Rubber bumpers are provided for external impact resistance.
Designed for single-direction flow, Series HF Monitors are recommended for use
with system filtration of a least 74 microns or a 200 mesh screen. Some applications
may also require magnetic filtration.
Brass and stainless steel models are calibrated for water with 1.0 specific gravity.
For a fluid with a significantly different specific gravity, a correction factor
can be determined by using the following formula. |
| Click
to See Dimension Graphic |
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Connection
Size
|
"A" Reference
|
"B" Wrench
Flats
|
"C" Reference |
| 1/4" to 1/2" NPT |
1-7/8" (48mm) |
1-1/4" (32mm) |
6-9/16" (167mm) |
| 3/4" to 1" NPT |
2-3/8" (60mm) |
1-3/4" (45mm) |
7-1/8" (181mm) |
| 1-1/2" NPT |
3-1/2" (90mm)
|
2-5/8" (58mm)
|
10-1/8" (258mm) |
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| Specifications: |
| Service: Compatible gases or liquids |
| Wetted Materials: Body: Aluminum, brass or 304SS
; Seals: Buna-N or Viton; Magnet: Teflon coated Alnico ; Other
internal parts: 304SS |
| Viscosity: 500 SSU |
| Temperature Limits: HFA, HFB and HFS Models: 240
°F (116 °C); HFH Models: 400 °F (204 °C) |
| Pressure Limits: HFA Models: 600 psig (41 bar); HFB
and HFH Models: 3500 psig (240 bar); HFS Models: 6000 psig (413bar) |
| Accuracy: ±4% FS over entire range; ±2.5%
over center third of the measuring range |
| Repeatability: ±1% of full scale |
| Shipping Weight: 1/8 to 1/2" FNPT Models - 2lbs;
3/4 to 1" FNPT Models - 3.5lbs ; 1-1/2 FNPT Models - 11lbs |
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| POPULAR MODELS: |
| Aluminum Body for Oil Based Fluids |
Model Number
|
Connection Size
|
Range, GPM |
| HFL-2-05 |
1/2" NPT(F) |
0.5-5 |
| HFL-4-25 |
1" NPT(F) |
2-25 |
|
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| Brass body
for water based fluids (non-steam) Wetted Parts: Brass,
Teflon coated Alnico, 304 SS and Buna-N |
Model Number
|
Connection Size
|
Range, Water GPM
(LPM) |
| HFB-2-05 |
1/2" NPT(F) |
0.5-5.0 (1-19) |
| HFB-3-15 |
3/4" NPT(F) |
2-15 (7.5-55) |
| HFB-3-20 |
3/4" NPT(F) |
2-20 (7.5-75) |
| HFB-4-35 |
1" NPT(F) |
5-35 (19-130) |
| HFB-5-50 |
1-1/2" NPT(F) |
5-50 (19-189) |
| HFB-5-100 |
1-1/2" NPT(F) |
10-100 (38-379) |
| HFB-6-150 |
2" NPT(F) |
20-150 (76-568) |
| HFB-6-75 |
2" NPT(F) |
8-75 (31-284) |
|
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| 304 Stainless
Steel body for high-pressure fluids Wetted Parts: 304 SS,
Viton and Teflon |
Model Number
|
Connection Size
|
Range, Water GPM
(LPM) |
HFS-2-02
|
1/2" NPT(F)
|
0.2-2.0 (0.75-7.5) |
| HFS-2-10 |
1/2" NPT(F) |
0.5-10 (1.9-38) |
|
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| Brass Body High Temperature
400°F for water based fluids. Wetted Parts: Brass, Teflon coated Alnico, 304SS
and Viton |
Model
Number
|
Connection
Size
|
Range,
Water GPM (LPM) |
| HFH-2-05 |
1/2" NPT (F) |
.05-5.0 (1-19) |
HFH-2-10
|
1/2" NPT(F)
|
1-10 (3.8-38) |
| HFH-4-35 |
1" NPT(F) |
5-35 (19-130) |
|
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| SUGGESTED
SPECIFICATION |
| Flow monitor
shall have sharp-edged orifice disk, sealed (aluminum)(brass)(304SS)
chamber and magnetically coupled outer indicator protected by
a clear Lexan® window. Unit shall be Dwyer Model No. HF____ |
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