Dwyer FLMG - Manual (Page 9)

Page 6
INPUTS/OUTPUTS and OPERATION
OPERATION
Display Reading. The FLMG 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
Empty Pipe
No Power
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.
Power.
The FLMG 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 FLMG 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 FLMG display
continues to read out the rate and total, but the “P” indicating
external power is extinguished. When power resumes, the
FLMG 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. The FLMG 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 Dwyer Instruments Inc. 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.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 to 20 mA converters;
see below):
High Frequency Output/K-Factor
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