Calibration; Calibration Procedure; Calibration Menu - ABB AW400 Series Instruction Manual

6 CALIBRATION

Calibration is required to align the sensor sensitivity. This operation is necessary at the start-up of the
instrument and at periodical intervals. New sensors have to be let in operation for at least 24 hours, to allow
the electrode to recover complete sensitivity, before performing the calibration procedure.
ATTENTION!
The calibration procedure must be accomplished having the sensor and the AW400
connected and powered.

6.1 Calibration Procedure

When the instrument is powered up or when a channel is changed, the following message is displayed:
To access the calibration procedure press the button MENU and insert the password, as shown in the
diagram at Paragraph 6.1.2. If the password is not correct, the access to the menu is refused and the
following message is displayed: -Access denied!-
If the code is the one previously set, it is possible to access to the Menu.
If problems are encountered during the calibration procedure, pressing the END key the calibration procedure
is aborted and the display returns to the main menu.
WARNING !
If the calibration procedure is aborted, the read out value may become unpredictable.
6.1.1

Calibration Menu

Calibration menu allows a dual point calibration procedure for the Monitors. In every dual point calibration, the
first number (P1) is the lower value point, and the second (P2) is the higher value point. The instrument has
P1 and P2 values assigned by default, as shown in the table 12. P1 and P2 values can be changed by the
user and have to be distant enough. Single point calibration (S.P.C.) is available for pH Monitor. For O2
Monitor two calibration procedures may be chosen: calibration in air and calibration in water.
Parameter P1 point value
PH 7.00
MV -500
O3 0.00
Cl 0.00
CD 0.00
T 0.00
mA 4.00
Table 12 - Default calibration values
44
-calib-
P2 point value
4.00
+500
1.00
1.00
1.00
100.00
20.00