Xylem WMX101-Series ELECTROMAGNETIC FLOW METERS - Manual (Page 9)

Page 7
INPUTS/OUTPUTS and OPERATION
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 8-32
Vdc at 30 mA max external power (see WARNING in wiring
diagrams). The display reads “P” when external power is in
use (see illustration below).
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 7 for connection diagrams to Seametrics controls
and displays.
Note: For data logger setup and operation, refer to Flow
Inspector Manual
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
one year 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.
High Frequency Output/K-Factor
Meter Size Pulses per Gallon Pulses per Liter
3” 25.228 6.665
4” 16.362 4.323
6” 6.307 1.666
8” 3.344 0.883
10” 2.150 0.568
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. IMPORTANT: When field installing the
input/output cable, be sure to snugly tighten the cable strain
relief to prevent water ingress.