Instruction Manual alpha-pH 1000
18
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
. Push the ENTER key and scroll to Advanced Set-up security code “22”.
Push 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
is 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
o
C) sub-function
7.2.1
Selecting automatic or manual temperature compensation
1)
Enter Advanced Set-up mode
. Push the ENTER key and scroll to
Advanced Set-up security code “22”. Push the ENTER key again.
2)
Press the
▲
or
▼
key
to scroll until the upper display shows “Set
o
C”.
3)
Press the ENTER ke
y. The lower display shows “Atc”; the upper
display shows “on” or “oFF” depending on whether or not ATC is
selected.
4)
Press the
▲
or
▼
key
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 the
▲
and
▼
keys (escape) simultaneously.
HOLD
SETUP
SEt
o
C
SETUP
HOLD
HOLD
oFF
Atc
on
Atc
SETUP