OxiTop
®
(-i/-IDS)
Operation
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03/2019
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4.5.1 OxiTop
®
-
PM (Cal-Test)
The test checks the tightness and calibration of the pressure measuring system
with the aid of a chemically simulated BOD.
The OxiTop
®
-PM calibration tablet contains, among other, a defined amount of
sodium sulfite. The oxygen in the sample bottle oxidizes the sodium sulfite to
sodium sulfate. This process consumes the oxygen present in the sample bot-
tle. The reduction of oxygen causes a defined negative pressure. The BOD
value corresponding to this negative pressure is given in the packet.
The procedure is similar to a BOD5 measurement with
specified filling volume (164 ml) and
addition of the calibration tablet
Details on sample preparation and steps of the test: see operating manual of
the OxiTop
®
-PM test resource.
Start of the test
The test is started in one of the following ways:
OxiTop-i
®
, OxiTop
®
-IDS without wirelessly connected meter:
BOD5 measurement (with fixed filling volume)
OxiTop
®
-IDS with wirelessly connected meter:
Menu-guided test OxiTop
®
-PM
(see operating manual of the meter)
Evaluation at the
measuring head
Evaluation in the
meter
see operating manual "MultiLine OxiTop
®
-IDS".
4.5.2 OxiTop
®
-PT (pneumatic test)
The test checks the measurement accuracy of the integrated pressure sensor
with the aid of a testing device creating a defined negative pressure. Correctly
functioning OxiTop
®
measuring head indicate the negative pressure created.
The altitude above sea level is taken into account for evaluation.
To perform the pneumatic test, you require the test resource OxiTop
®
-PT.
The test says nothing about the long-term impermeability of the system.
1.
Display the measurement result of the BOD measurement at the mea-
suring head.
2.
Compare the measured value to the lot test value (see operating man-
ual OxiTop
®
-PM).
With the OxiTop
®
-IDS measuring heads, the calibration date for
the measuring heads is stored in the wirelessly connected meter.
