53
8.2 Span Sensitivity Correction Mode
When calibrating periodically, please calibrate in Span sensitivity correction mode.
By setting the Span sensitivity correction value in percentage, calibrates ORP value
indicated on the AER-101-ORP to read 260 mV (at 20 ) when immersing the ORP
Combined Electrode Sensor in the standard solution (Quinhydrone potential difference
260 mV).
The unit cannot enter Span sensitivity correction mode in the following cases:
• When
(Lock 1),
(Lock 2) or
(Lock 3) is selected in [Set
value lock (p.47)]
• When
(Cleansing output) is selected in any of [EVT1 to EVT4 type (pp. 23,
29, 35, 41)], and cleansing action is performing using the ‘Cleansing time’ and
‘Restore time after cleansing’ settings.
The following outlines the procedure for calibration.
(1) When selecting
(Last value HOLD) in [Transmission output status in
Adjustment Mode, Span Sensitivity Correction Mode (p.49)], select it while the ORP
Combined Electrode Sensor is being immersed in the solution currently calibrated.
(2) Press and hold the
key and
key (in that order) together for 3 seconds in
ORP Display mode or Cleansing Output mode.
The unit enters Span sensitivity correction mode, and indicates the following.
Display
Indication
ORP Display
and ORP value are displayed alternately.
Setting Display
The Span sensitivity correction value is displayed.
(3) Immerse the ORP Combined Electrode Sensor in the standard solution
(Quinhydrone potential difference 260 mV).
(4) Set a span sensitivity correction value with the
or
key so that ORP value
is approximately 260 mV (at 20 ).
For other temperature and electric potentials, refer to the temperature
characteristics of your standard solution.
Setting range: 50 to 150%
(5) Press the
key.
Span sensitivity correction mode is complete, and the unit reverts to ORP Display
mode or Cleansing Output mode.