OX 4000 H
Operation
23
ba75853e04
06/2012
5.2.5
D.O. calibration
Why calibrate?
D.O. sensors age. This changes the slope of the D.O. sensor. Calibra-
tion determines the current slope of the sensor and stores this value in
the instrument.
When to calibrate?
After connecting another D.O. sensor
When the sensor symbol flashes (after the calibration interval has
expired).
Calibration procedure
Calibration in water vapor-saturated air.
Use an air calibration vessel for calibration.
Note
The OXY 11 sensor is zero-current free
(see operating manual
OXY 11). Therefore the calibration of the zero point is not necessary
and even not provided.
Stability control
[Auto]
In calibration, the stability control [Auto] function is automatically acti-
vated.
Displaying the
calibration data
You can have the data of the last calibration displayed (see section
5.2.6).
Calibration evaluation
After the calibration, the meter automatically evaluates the current sta-
tus of the calibration. The evaluation appears on the display and in the
calibration record.
Display
Calibration record
Relative slope
+++
S = 0.8 ... 1.25
++
S = 0.7 ... 0.8
+
S = 0.6 ... 0.7
Error
Error
S < 0.6 or S > 1.25
Eliminate the error according to
chapter 6 W
HAT
TO
DO
IF
...
