Dwyer HF - Manual (Page 2)

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.
For Water Monitors use:
Actual = Observed Reading x 1.0
S.G.
For Oil Monitors use:
Actual = Observed Reading x 0.873
S.G.
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.
√
304 Stainless Steel body for high-pressure fluids:
Wetted Parts: 304 SS, Fluoroelastomer and PTFE
Brass body for water based fluids (non-steam):
Wetted Parts: Brass, PTFE coated Alnico, 304 SS and Buna-N
Brass Body High Temperature 400˚F for water based fluids:
Wetted Parts: Brass, PTFE coated Alnico, 304 SS and Fluoroelastomer
Range, Air
SCFM
2-12
2-12
4-23
Connection
Size
1/8˝ female NPT
1/4˝ female NPT
1/4˝ female NPT
Model
Number
HFA-0-01
HFA-1-12
HFA-1-22
Model
Number
HFS-0-01
HFS-2-02
HFS-2-10
Connection
Size
1/8˝ female NPT
1/2˝ female NPT
1/2˝ female NPT
Range, GPM
Water
0.05-1
0.2-2
0.5-10
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
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
Model
Number
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
Model
Number
HFH-2-05
HFH-2-10
HFH-4-35
Connection
Size
1/2˝ female NPT
1/2˝ female NPT
1˝ female NPT
Range, GPM
Water
0.5-5
1-10
5-35
Range, GPM
Oil
0.5-5
2-25
Connection
Size
1/2˝ female NPT
1˝ female NPT
Model
Number
HFL-2-05
HFL-4-25
Max. Pressure
Drop, PSID
3.32
3.32
3.61
Range, LPM
Oil
1-19
7.5-95
Max. Pressure
Drop, PSID
6.08
8.41
Aluminum body for oil based fluids:
Wetted Parts: Aluminum, PTFE coated Alnico, 304 SS and Buna-N
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
Max. Pressure
Drop, PSID
1.98
5.58
7.18
10.2
6.2
15.2
9.25
25.59
14.95
39.86
Range, LPM
Water
0.19-3.8
0.75-7.5
1.9-38
Max. Pressure
Drop, PSID
1.98
5.58
8.68
Range, LPM
Water
1-19
3.8-38
19-130
Max. Pressure
Drop, PSID
7.18
8.68
13.46
Aluminum body for air or other non-corrosive gases:
Wetted Parts: Aluminum, PTFE coated Alnico, 304 SS and Buna-N
√
F-55:HF Bulletin 7/24/09 9:54 AM Page 2