EUTECH INSTRUMENTS alpha-pH1000, Operating Instructions Manual, Page: 18 / 39

alpha-pH 1000
14
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 key. 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