Metrohm 785 DMP Titrino - Manual (Page 171)

6.3. Titrino validation
785 DMP Titrino
168
6.3 Titrino validation
Checking and maintenance of the Titrino is carried out in 3 steps:
1. Testing the electronic components when the Titrino is switched on.
2. Wet-chemistry validation of the whole coulometric analysis setup
3. Maintenance and adjustment of the Titrino by Metrohm service.
6.3.1 Electronic tests
When the Titrino is switched on electronic tests are carried out. During this period
system
tests
appears in the display.
The tests are documented in the system test report, which can be printed out when the
Titrino is switched on (see page 8):
6.3.2 Wet tests
GLP (Good Laboratory Practice) requires the periodic validation of the analytical instru-
ments. The reproducibility and accuracy of the instruments are checked.
An annual repetition of the procedure appears to be sensible. Depending on the require-
ments a more frequent check may be indicated, e.g. every 3 or 6 months.
Guidelines for the testing regulations (SOP, Standard Operating Procedure) are given in
the following Metrohm Application Bulletin:
No. 252: Validation of Metrohm Titrators (potentiometric) according to GLP/ISO 9001.
The validation interval can be checked by the Titrino (set under , monitoring).
If the interval has elapsed the Titrino displays the message
validate instrument
.
6.3.3 Maintenance and adjustment of the Titrino
The Titrino should be serviced and adjusted by Metrohm service at regular intervals.
The Titrino can check the date of the next service with the help of the monitoring function
"Service" under , monitoring. If this date has been passed then the Titrino will
display the message
service is due
.
Contact Metrohm service if one of these
tests is "not OK".
If the "real time clock" test is not ok, you can
try to set date and time again. If the test is
OK afterwards you should check whether
your stored methods have remained un-
changed.
'di
785 DMP Titrino 009/322 785.0010
date 1999-06-10 time 07:24
RAM test OK
real time clock OK
timer OK
A/D converter OK
LCD display OK
COMPorts OK
EPROM test OK
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