Advantage Controls MegaTronMT Installation Maintenance Repair Manual page 21

2.9. Water Meters / Totalizers
Each system with a timer on it will have 2 water meter inputs. Each of these can have the incoming contact
defined, allowing the controller to keep track of water usage. If desired, the controller can calculate evaporation
loss by subtracting the deference between a system's two water meter inputs.
2.9.a. Option W Totalizers
MegaTron MT controllers with "W" option may have 1 to 4 auxiliary flowmeter inputs. These additional inputs
are for tracking various flow meter devices (additional water meters or flowmeters in a metering pump's
discharge tubing). They can also be linked to a system's water meter input for additional tracking and alarm
capabilities, including bleed flow/no flow, exceeding too much flow in a 12- or 24-hour period. Units with
Auxiliary Flow meter inputs have a Home menu selection for Totalizers. The Totalizer menu has selections
for each of the System Water Meters, plus one named Aux Meters.
3. mA Signals
CONTACT VALUE - Defines the numerical value for a
contact; i.e. 10.
CONTACT UNIT - Defines the units of measurement
for a contact; i.e. Gallons / Contact. If there is a mA
input set for a gpm or lpm reading, that mA input can
be selected in the Contact Units as the source for the
meter input to total flow rate.
RESET TOTAL - Resets the totalizer count.
EVAP CALC - Defines which way to subtract the two
water meter inputs for an evaporation value.
DEBOUNCE - An additional amount of time the input
will wait before accepting another water meter contact
to reduce false contacts from a chattering read switch.
Select the system water meter to set up or go to Aux
Meters to set-up the auxiliary flow meters.
mA OUT SETTINGS - Selecting source and range of
outputs.
mA IN SETTINGS - Setting control and alarms for
inputs
mA OUT CALIBRATION - Calibrating outputs.
mA IN CALIBRATION - Calibrating inputs and
displayed range.
21