EUTECH INSTRUMENTS ALPHA PH 800 PHORP CONTROLLERTRANSMITTER, Руководство по эксплуатации

Страница: 18 / 34

14
7 ADVANCED SET UP MODE
7.1 Electrode Offset (OFS) sub-function
This option is available only in the pH mode. An allowance of
±
120mV is
allowed to correct for electrode deviations. This feature is useful for
prolonged on-line applications.
The controller will add or subtract the value from the measured pH and
display the correct value. Should the offset value be too high, consider
performing maintenance on the electrode followed by calibration. If the
calibration is unsuccessful, please replace the electrode.
1) Take a sample from the system and note the pH
reading displayed on the controller.
2) Measure the pH of the sample using a calibrated
pH tester, hand-held meter, or bench meter. Record
the correct pH value.
3) Enter Advanced set-up mode . Press ENTER.
4) Press the
∆∆∆∆
or
∇
∇ ∇
∇
keys 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 on-line measured pH value. The upper
display shows the current offset value.
6) Press the
∆∆∆∆
or
∇
∇ ∇
∇
keys until the pH value coincides with the correct pH
value noted in Step 2. As the
∆∆∆∆
or
∇ ∇ ∇ ∇
keys is pressed to adjust the pH value,
the ‘offset’ value in the 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.
SETUP
SETUP
HOLD
HOLD
Ofs Ofs Ofs Ofs
-0.05 -0.05 -0.05 -0.05
7.00