Agilent Technologies PL-GPC 220, Руководство пользователя

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76 PL-GPC 220 User Manual
7
Maintenance
Testing Overtemperature Protection Systems
Oven Overtemperature Protection Test
1
Use a small screwdriver to reduce the setting on the oven over temperature
display (on the right hand side of the front panel) until the value is 5 °C less
than the actual oven temperature (displayed on the centre of the front
panel).
A loud audible alarm will sound and the decimal points on the over
temperature display will flash. The power to the oven heaters and waste
transfer line is now interrupted. Do not press the
reset
button until the test
is completed.
2
Wait until the displayed oven temperature falls in order to verify correct
operation of the protection system.
3
Once oven cooling has been verified, adjust the over temperature display to
5 °C above the oven set point and press the
reset
button to silence the
alarm.
This concludes the oven over temperature protection system test.
Preparations This test can be carried out at any operating temperature above 40 °C.
If the instrument is at room temperature then it will be necessary to heat the oven.
To heat the oven:
1
Set the oven temperature to 40 °C and the heat rate to 0.5 °C/min.
2
Disable the autosampler heaters.
3
Put the instrument into RUN mode or IDLE mode (using a suitable solvent e.g. acetone) and wait
for the oven temperature to stabilize.
N O T E
If the alarm does not sound: first check that the above procedure has been followed
correctly.
If the procedure has been carried out correctly but no alarm sounds, disconnect both power
cords from the instrument and contact your local Agilent Service Department.
N O T E
If the displayed oven temperature shows no decrease after 30 min while the alarm is
sounding then switch the instrument off, disconnect both power cords and call your local
Agilent Service Department.