Dwyer Instruments WM2 Operating Manual
Bulletin F-WM2
H
L
WM2-X-C-XX
XX-XX
W
Series WM2 Multi-Jet Water Meters
Specifications - Installation and Operating Instructions
The Series WM2 Multi-Jet Water Meter is ideal for commercial and industrial
pplications. The multi-jet design allows simplicity and accuracy with wide flow
a
anges, even in low flow applications. The magnetically driven, hermetically sealed
r
register will not leak or fog and is completely separated from the water. These
water meters are designed for long service life and maintenance-free operation,
complete with an internal strainer.
Installation Instructions
1. Thoroughly flush the service line upstream of the meter to remove dirt and
debris.
2. Remove meter spud thread protectors.
Note: To protect meter spud threads, store the meter with thread protectors in
place.
3. Set the meter in the line. Install in a horizontal plane, with the register upright, in
a location accessible for reading, service and inspection. Arrows on the side of the
meter and above the outlet spud indicate the direction of flow.
4. For accurate measurement, the tap height should be higher than the meter.
5. Do not over-tighten connections; tighten only as required to seal. Do not use
pipe sealant tape on meter threads.
6. With upstream shut-off valve only: Open shut-off valve slowly, to remove air from
meter and service line. Open a faucet slowly to allow entrapped air to escape.
Close the faucet.
With both upstream and downstream shut-off valves installed. To test the
installation for leaks: Close the outlet (downstream) shut-off valve. Open the inlet
(upstream) shut-off slowly until meter is full of water. Open the outlet (downstream)
valve slowly until air is out of the meter and service line. Open a faucet slowly to
allow entrapped air to escape. Close the faucet.
Size
in (mm)
/8 (15)
5
/8 x 3/4
5
/4 (20)
3
1 (25)
1-1/4 (32)
1-1/2 (40)
2 (50)
Spud NPSM
(BSPP)
/4˝ (3/4˝)
3
˝ (1˝)
1
˝ (1˝)
1
1-1/4˝ (1-1/4˝)
1-1/2˝ (1-1/2˝)
2˝ (2˝)
2-1/2˝ (2-1/2˝)
SPECIFICATIONS
Service: Water.
Wetted Materials: Body: Brass, polyethylene; Couplings: Brass; Measuring
Chamber: Polyethylene, ABS plastic, ferrite, acetal.
Flow Range: See model chart.
Accuracy: Transitional Flow: ±5%; Nominal Flow: ±2%.
Temperature Limit: 104°F (40°C).
Pressure Limit: 232 psi (16 bar).
Pressure Drop: See pressure drop chart.
Totalizing Display Maximum: See model chart.
Mounting Orientation: Horizontal with register face up.
Weight: See dimension chart.
CAUTION
occur.
Length ‘L’
in (mm)
-1/2 (165)
6
-1/2 (190)
7
-1/2 (190)
7
10-1/4 (260)
10-1/4 (260)
11-13/16 (300)
11-13/16 (300)
Unit must be installed in a horizontal position with the register
face pointing up otherwise leakage and/or meter damage will
Width ‘W’
in (mm)
-45/64 (94)
3
-45/64 (94)
3
-45/64 (94)
3
3-55/64 (98)
3-55/64 (98)
4-51/64 (122)
5-45/64 (145)
Height ‘H’
in (mm)
-15/64 (107.5)
4
-15/64 (107.5)
4
-15/64 (107.5)
4
4-5/8 (117.5)
4-5/8 (117.5)
5-9/16 (141.5)
6-31/32 (177)
Weight
lb (kg)
.75 (1.7)
3
.97 (1.8)
3
.9 (2.2)
4
6.4 (2.9)
8.2 (3.7)
13.52 (6.17)
18.74 (8.5)
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: 219/872-9057 e-mail: info@dwyer-inst.com
Phone: 219/879-8000 www.dwyer-inst.com
Model
WM2-A-C-01
M2-A-C-02
W
M2-A-C-03
W
M2-A-C-04
W
M2-A-C-06
W
WM2-A-C-07
odel
M
M2-B-C-08
W
WM2-B-C-10
WM2-B-C-11
WM2-B-C-12
M2-B-C-13
W
M2-B-C-14
W
Size
5/8˝
/8 x 3/4˝
5
/4˝
3
˝
1
-1/2˝
1
2˝
ize
S
5 mm
1
20 mm
25 mm
32 mm
0 mm
4
0 mm
5
Coupling
Size
1/2˝ NPT
/4˝ NPT
3
/4˝ NPT
3
˝ NPT
1
-1/2˝ NPT
1
2˝ NPT
oupling
C
ize
S
/2˝ BSPT
1
3/4˝ BSPT
1˝ BSPT
1-1/4˝ BSPT
-1/2˝ BSPT
1
˝ BSPT
2
Max Flow
Nominal Flow Range
GPM (Gallons Per Minute)
20
0
2
0
3
0
5
00
1
160
ax Flow
M
3
5
7
12
0
2
0
3
1 to 20
to 20
1
to 30
2
to 50
3
to 100
5
8 to 160
ominal Flow Range
N
.12 to 1.5
0
0.2 to 2.5
0.28 to 3.5
0.48 to 6
.8 to 10
0
.2 to 15
1
3
m
/h
Transitional Flow
0.25
.25
0
.5
0
.75
0
.5
1
2
ransitional Flow
T
.03
0
.05
0
0.07
0.12
0.2
.3
0
Meter Reading
The total flow that has passed through your meter is read by starting at the top of
the register with the Five-Digit Totalizer, and then read clockwise around the small
ials. In the example below, the Five-Digit Totalizer reads 13800 (138 x 100), and
d
he dials read 60 (6 x10), 2 (2 x1), and 0.4 (4 x 0.1) respectively. The total flow is
t
3862.4.
1
Display Max
Gallons)
(
,999,999.99
9
,999,999.99
9
,999,999.99
9
9,999,999.99
99,999,999.9
99,999,999.9
isplay Max
D
3
m
(
)
9,999.9999
9
9,999.9999
9
99,999.9999
99,999.9999
999,999.9999
99,999.9999
9
Accuracy Chart
INSTALLATION
Pressure Drop
MAINTENANCE/REPAIR
Preventative maintenance consists of periodic inspections and cleaning
procedures. The procedures should be performed at regular intervals, and any
defects discovered should be corrected before further operation of the meter.
Visually inspect the meter for missing hardware, broken resistor glass, or other
signs of wear or deterioration. Verify proper flow rate and pressure for meter. A loss
in pressure, with the resulting flow rate decrease, may indicate the meter screen is
clogged and requires cleaning.
Clean the strainer yearly, or as required, depending on water condition. Pull out the
strainer or back flush the meter to loosen trapped particulates
The Series WM2 is not field serviceable and should be returned if repair is needed.
Field repair should not be attempted and may void warranty.
WARRANTY/RETURN
Refer to “Terms and Conditions of Sales” in our catalog and on our website. Contact
customer service to receive a Return Goods Authorization number before shipping
the product back for repair. Be sure to include a brief description of the problem plus
any additional application notes.
(DN3
)
2
(DN40)
(DN50)
0)
25)
(DN15)
(DN2
(DN
©Copyright 2016 Dwyer Instruments, Inc. Printed in U.S.A. 9/16 FR# 444045-00 Rev. 4
DWYER INSTRUMENTS, INC.
Phone: 219/879-8000 www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: 219/872-9057 e-mail: info@dwyer-inst.com
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