Seametrics WMX-Series - Manual (Page 3)

Meter Equalization Lug
Plastic Pipe Plastic Pipe
6 AWG Stranded
Copper Ground Wire
Ground Clamp
8’ Ground Rod
Earth
Exothermically weld when
corrosion is a concern
The WMX-Series are flanged electromagnetic flowmeters
for use in 4” to 10” pipe in municipal or industrial water
and wastewater applications where propeller meters have
typically been used in the past. Because the WMX has
no moving parts and electrodes designed to discourage
fouling, this magmeter performs well and requires much
less frequent maintenance in applications where debris
or sand would impede propeller meters. There is no rotor
to stop turning or bearings to wear out. Minimal straight
pipe requirements allow WMX-Series meters to be used in
piping configurations where there is little space between
the meter and an elbow.
Rate and total indication is standard on both models. Flow
measurement units are customer-selected and factory-
set and can only be changed in the field by an authorized
SeaMetrics dealer.
The WMX101 is externally powered with 7-26 Vdc at 30
mA max (see WARNING on Wiring Diagrams). Two Lithium
3.6V “D” batteries provide backup during power failures,
allowing the meter to seamlessly continue recording flow
rate and total for the duration of the outage.
The 20-foot cable also provides pulse output for use with
a variety of SeaMetrics and other displays and controls for
remote reading, data logging, pulse-to-analog conversion,
and telemetry applications. Pulse rate is customer-selected
and factory-set and can only be changed in the field by an
authorized SeaMetrics dealer. Default is high frequency for
use with 4-20 mA signal conversion devices.
The WMX104 is a battery-operated unit for use when no
additional input or output is required. The Lithium 3.6V
“D” batteries are replaceable with an approximate 3-year
life under continuous use, depending on the duty cycle.
An optional cable can be installed post-factory if power or
pulse output is needed for changing applications.
INSTALLATION
Positioning the Meter. These meters can be installed
horizontally, vertically, and in any radial position.
Straight Pipe Recommendations. As with most flow
meters, the WMX requires some straight pipe before and/or
after the meter for best accuracy. However, the ability of
electromagnetic meters to average the flow across the entire
pipe allows for shorter straight pipe recommendations than
most mechanical meters (see page 3).
Full Pipe Recommendations. All magmeters require a
method for determining that the pipe is empty, to prevent
false reading. This meter is designed to go to zero reading
GENERAL INFORMATION, INSTALLATION, GROUNDING
Page 2
Caution: These flow sensors are not recom-
mended where installation fault may expose the
flow sensor to boiler pressure and temperature.
Maximum recommended temperature is 130˚ F.
if one or more electrodes is exposed. For highest accuracy,
install the meter so that the pipe will be full when there is
flow. If air bubbles may be present in the pipe or sludge
accumulation is an issue, rotate the meter by one flange
hole to position the control housing at a 45˚ angle. See
Full Pipe diagrams on page 4.
Fittings. The WMX flanges have standard ANSI 150 lb.
drilling and mate with any other ANSI 150 lb. flange.
Calibration. The WMX is factory-calibrated and will not
require any form of field calibration.
EqUALIzATION AND GROUNDING
Metal Pipe Installations. To equalize the electrical
potential of the fluid, the WMX101 or 104, and the
surrounding pipe, secure the flange plates (factory-installed
on the equalization lug) to both pipe flanges at one of the
bolt holes, as shown below. Be sure the lockwasher fits
between the pipe flange and the flange plate.
Equalization Diagram
Equalization Lug
Meter
Flange
Pipe
Flange
Bolt
Run wire from equalization lug to both pipe flanges;
secure flange plates under bolt head as shown.
Meter Flange
Pipe Flange
Flange Plate
Lockwasher
WARNING: ELECTRICAL SHOCK HAzARD When
the meter is externally AC powered (WMX101
or adapted 104), the piping system must be
grounded to meet national and local electrical
safety codes. Failure to do so can result in electrocution.
Plastic Pipe Installations. When the WMX is installed in a
plastic piping system, it is not necessary to use the equal-
ization straps, but very important to ground the meter to
avoid electrical shock hazard and electrostatic interfer-
ence with meter function.
AR
CH
IVE
D
(January 2008)