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3.2 pH and ORP Calibration
1 POINT
- With a clean probe on-line seeing the system’s
water enter the known (tested from a calibrated hand
held tester) value.
2 POINT
- Enter a known Low value with a clean probe
in a buffer solution. Then enter a known High value with
the clean probe in a buffer.
Notes:
1. Probes must be rinsed between buffers when doing a 2 Point calibration and given at least
30 seconds in solution to adjust to the buffer.
2. There must be at least 2 full pH points between buffer solutions. Using a buffer of 4 and 10
is the best procedure. ORP buffers should be at least 200 points apart.
3.3 4-20mA Output Calibration
4-20mA outputs can be calibrated to insure that the
output generated by the controller and received by the
external device match. With a volt meter connected
across the out and return wires (see page 7) of the
4-20mA output channel to be calibrated go into the
output’s Low or High calibration.
The number displayed in the Calibration dialog box
can range from 0-4095 with 800 equal to 0 mA output
and 4030 equal to 20 mA. This number range of
0-4095 is the raw digital to analog (D/A) values and is
strictly used for a reference. The D / A numbers you
get will vary based on your installation conditions.
While in the High or Low calibration pop-up screen use
the up and down arrows to change the output value
being read with the volt meter. Adjust the High value
for the 20 mA reading and the Low value for the 4 mA
value.
>SYSTEM 1 pH CALIBRATION<
1 POINT CAL
2 POINT CAL
>CURRENT LOOP CALIBRATION<
OUTPUT 1
OUTPUT 2
>mA OUTPUT 1 CALIBRATION<
HIGH 4030
LOW 800
>mA OUTPUT 1 CALIBRATION<
OUTPUT 1 CAL HIGH
4000
Use Up/Down arrows to change
Use Enter to save value
Summary of Contents for MegaTron
Page 30: ...30 Notes Common boiler blowdown valve connections ...
Page 31: ...31 Notes ...
