Operation
OxiTop
®
(-i/-IDS)
20
ba77059e01
03/2019
4.5
Calibration
Why calibrate?
The condition of the heads can be evaluated by checking the tightness and
measuring accuracy (see BOD application report).
When to calibrate?
Routinely within the framework of the company quality assurance
Calibration
procedure
Creation of a defined negative pressure and balancing with the display (see
BOD application report).
In contrast to physical or chemical measuring methods, BOD systems do not
provide standardized values, as the use of microorganisms has a great spec-
trum depending on their composition and food supply. With the aid of testing
tools and suitable tests, errors due to defective pressure sensors or untight
measuring head threads can be identified.
You can check the OxiTop
®
(-i/-IDS) measuring heads with the following proce-
dures.
OxiTop
®
-PM (Cal-Test)
OxiTop
®
-PT (pneumatic test)
figure 4-2 Graphic display of a BOD measurement
1 Y-axis: Measured value
2 X-axis: Days
3 Cursor
4.
Using
<
>
, indicate the measured value of the individual days with
the cursor.
5.
Using
<
_
>
, quit the graphic display.
The stored data are displayed again.
6.
Terminate the display of the stored measured values with
<M>
.
BSB[mg/l]
7 [d]
+
10.9
0
3
1
2
