Advantage Controls MegaTron - 4-20 mA Interfaces and Calibration; 4-20 mA Output Setup; 4-20 mA Input Setup; Conductivity Calibration

17
2.6 4-20mA Out
Units with a 4-20mA output option will have a menu for setting up the 4-20mA output. The 4mA and 20mA
values can be dened by giving the output proportioning capability. i.e. 4mA = a pH of 6.0 and 20mA = a pH
of 8.0.
SIGNAL SOURCE - Select which probe reading the
mA will use as its reading source.
4 mA VALUE - What the 4mA signal equals
20mA VALUE - What the 20mA signal equals on the
assigned signal sources scale.
2.7 4-20mA Input
SET POINT - What reading turns the relay on
DIFFERENTIAL - Amount reading changes by before
the relay is turned o󰀨
HIGH ALARM - What reading generates a High alarm
notication.
LOW ALARM - What reading generates a Low alarm
notication.
3. Calibration
Calibration is for adjusting the displayed value of a probes reading to match your tester or known solution.
Pick the system or mA input rst. From a particular system pick the probe to calibrate.
CALIBRATION - For adjusting the actual reading
values of the available analog probe inputs, such as
conductivity, pH, ORP or temperature.
3.1 Conductivity Calibration
CALIBRATE - With a clean probe on-line seeing the
system’s water enter the known (tested from a calibrated
hand held tester) value.
RESET ZERO - With the probe out of solution and dry
enter a new zero point. Note: Probe must be dry!
NOTE: In the calibration pop-up window the raw analog to digital (A/D) value will be displayed. A new
calibration value should only be entered when the probe is sensing a stable A/D value. If the system is a
boiler the associated relay can be forced on in the pop-up to allow for a fresh hot sample. Boiler probes
should have fresh hot water blown past them for a minimum of 2 minutes before calibrating.TheA/Dreading
has a range of 0 to 32,767. If it is at one end of the range or the other when trying to calibrate
something is wrong with the probe or wire run.
>OUT 1 SETUP<
SIGNAL SOURCE
4mA VALUE
20mA VALUE
>SYSTEM 1 CALIBRATION<
SYSTEM COND
SYSTEM TEMP
SYSTEM pH
SYSTEM ORP
>SYSTEM 1 COND CALIBRATION<
CALIBRATE Cal Factor 1.10
RESET ZERO
>mA INPUT 1 SETPOINT<
SET POINT
DIFFERENTIAL
HIGH ALARM
LOW ALARM