Seametrics WMX-Series - Manual (Page 6)

Page 5
INPUTS AND OUTPUTS
OPERATION
Display Reading. The WMX display has two lines, the
bottom line for flow rate and the top line for accumulated
total. Measurement units are pre-ordered and factory-
set and can be changed in the field only by an authorized
individual.
Refer to the diagrams below to read your display.
External Power Indicator
(WMX101 Only)
Empty Pipe
Low
Batt
Low Battery Indicator
(3 days remaining)
No Power
Battery Power
(WMX104 Standard Operation)
(WMX101 Backup Operation)
Meter Installed Backwards
Caution: There are no user-adjustable
connections or settings inside the display
housing. Use caution when opening the
housing for a battery change, to avoid
damage to internal components.
WMX101
External Power (WMX101). The WMX101 operates on
7-26 Vdc at 30 mA max external power (see WARNING in
wiring diagrams). The display reads “P” when external
power is in use (see illustration).
The Lithium battery pack installed in the WMX101 serves
as backup in the event of a power failure, when it will keep
the meter operating without interruption for the duration of
the outage. When battery power in is use, the WMX101
display continues to read out the rate and total, but the
“P” indicating external power is extinguished. When power
resumes, the WMX101 will seamlessly return to normal
power mode, and the “P” will again display.
When used for occasional emergency backup, battery life
is approximately ten years.
Pulse Output (WMX101). The WMX101 cable also provides
pulse output that can be used for remote reading, 4-20 mA
signal conversion, datalogging, and telemetry applications.
See page 6 for connection diagrams to SeaMetrics controls
and displays.
Pulse rates are selected by the customer at time of order,
factory-set, and can only be changed in the field by an
authorized SeaMetrics dealer. Three pulse rates are
possible: One pulse per ten gallons (or liters), one pulse
per thousand gallons (or liters), or High Frequency (required
for use with 4-20 mA converters; see below):
WMX104
Battery Power (WMX104). The WMX104 is powered by
a non-rechargeable battery pack with an average lifespan
of three years under typical (full-time) use. Actual lifespan
will vary from application to application, depending on the
duty cycle.
“Low Batt” will display when there are approximately
three days of use left in the batteries (see illustration).
Replacement instructions come with the custom battery
pack available from your dealer or SeaMetrics.
Pulse Output (WMX104). Pulse output capabilities are
built in to the WMX104, but cannot be utilized without the
addition of an optional output cable. A WMX104 can be
retrofitted with this cable in the field.
High Frequency Output
Meter Size Pulses per Gallon Pulses per Liter
4” 16.362 4.323
6” 6.307 1.666
8” 3.344 0.883
10” 2.150 0.568
AR
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(January 2008)