wtw OxiTop C, Operating Manual

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OxiTop
®
Control OC 100 What to do if...
ba31114e06 06/2012
73
10.3 General information
Cause Remedy
No or missing sample
entries in the sample
management  The BOD Routine operating mode
is switched on. Samples were
started in the other operating
modes.
 Switch on the BOD Standard oper-
ating mode
(see section 7.4.1 O
PERATING
MODE
, page 40).
At the beginning of the
measurement, no
measurement curves
are displayed
Measurement curves
do not emerge from
the origin  The sample filled and started was
too cold.
 The AutoTemp function is switched
off.
 Temper the sample more precisely.
 Switch on the AutoTemp function
(only effective with run durations of
more than 1 day).
No measurement
curves are displayed
although the measure-
ment has already been
running for an extended
period of time  No data were retrieved from the
measuring heads.
 The AutoTemp phase is still run-
ning (see section 7.4.7 A
UTO
T
EMP
,
page 44).
 Call up the data of the measuring
heads.
See section 5.3 C
ALLING UP ALL
DATA
, page 22.
 Wait for the end of the AutoTemp
phase then start the
evaluation.
Search for free
measuring heads for a
new measurement Perform the - Show free

function (see section 7 GLP/TOOLS, page
38).
The controller causes the free measuring positions to flash
for 5 seconds.
Measuring head
unintentionally started
for measurement
Measuring head
started with incorrect
settings
Measuring head is
required for another
sample
The measuring head can be released again through the
command Reset/release:
see section 7.6.2 R
ESET
/
RELEASE
, page 56.
The controller guides you further through the operation.
If only one measuring head is stored under the corresponding sample number
(in the
BOD Routine operating modes, this is always the case), the controller
automatically erases the sample in the sample management.
Search for a defective
measuring head Perform a measuring head reaction test (see above). A measuring head that
repetitively shows no reaction to the test is defective.
If the defective measuring head cannot be established in this way, perform the
measuring head check (see “Single check”). In doing this, each individual
measuring head must be checked until the defective measuring head has
been found.
A measuring head is
missing or is defective.
Requirement:
To determine the
corresponding sample
Call up the function “Call up data” from the sample
management for each individual unfinished sample. The corresponding sam-
ple can be determined by this.
For subsequent error handling, see section 5.4.4 C
ALLING UP DATA
, page 27.