7
ADVANCED SET UP MODE
7.1
Electrode Offset (OFS) sub-function
You can perform electrode offset only in the pH mode. This mode allows you to change the
offset parameter to make reading corrections without removing the electrode from the control
system. You can make adjustments of up to ±120 mV.
The controller will add or subtract the value from the measured pH and display the correct value.
However, if you need to offset the value beyond the average offset you would expect in your
application type, consider a full calibration or even electrode replacement.
1) Pull a sample from the system. Record the controller’s pH reading at the time you take the
sample.
2) Measure the pH of your sample using a calibrated pH tester, hand-held meter, or bench
meter. Record the correct pH value.
3)
Enter Advanced set-up mode.
Press the ENTER
key and scroll to Advanced Set-up
security code “22”. Press the ENTER key again.
4)
Press the
▲
or
▼
key
to scroll until the upper display shows OFS.
5)
Press the ENTER key
. The SETUP annunciator appears at the top of the display. The lower
display shows the current measured pH value. The upper display shows the current offset
value.
6)
Press the
▲
or
▼
key
until the pH value coincides with the correct pH value noted in Step
2. As the
▲
and
▼
keys are pressed to adjust the pH value, you will see that the ‘offset’
value in its upper display also changes.
7)
Press the ENTER key
to enter the offset value.
Note:
The offset value is reset during full calibration. See Section 6 for full calibration instructions.
Note:
The offset parameter is blanked out during ORP operation.
7.2
Setting temperature (Set °C) sub-function
7.2.1
Selecting automatic or manual temperature compensation
Set
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD
1)
Enter Advanced Set-up mode.
Press the ENTER key and scroll
to Advance Set-up security code “22”. Press the ENTER key
again.
2)
Press
▲
and
▼
keys
to scroll until display shows “Set °C”.
3)
Press ENTER key.
The lower display shows “Atc”; upper display
shows “on” or “oFF” depending on whether or not ATC is selected.
4)
Press
▲
and
▼
keys
to toggle between ATC on and off.
5) Proceed with additional Advanced Set-up procedures (press
ENTER again) or return to Measurement mode by pressing
▲
and
▼
keys (escape) simultaneously.
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