PL-GPC 220 User Manual 77
Maintenance
7
Testing Overtemperature Protection Systems
Autosampler Overtemperature Protection Test
Warm Zone
1 Adjust the autosampler over temperature display setting (located on the left
hand side of the front panel) to 4 – 6 °C higher than the current warm zone
set point (shown on the Control software screen)
2 Increase the warm zone set point by 20 °C.
3 Wait a few seconds for the warm zone to heat up.
A loud audible alarm will sound. The power to the autosampler heaters is
now interrupted.
4 Wait at least three minutes for the warm zone to cool before pressing and
holding the reset button.
5 Note the initial value on the over temperature display while the reset button
is held.
This indicates the actual warm zone temperature, which should initially be
at or below the over temperature set point before rising quickly.
6 If the initial value shown is close to the warm zone set point then the
protection system is not functioning correctly.
OR
Once warm zone cooling has been verified then adjust the over temperature
display to 4 – 6 °C above the present warm zone set point and press the
reset button to silence the alarm.
7 Wait a few minutes for the warm zone temperature to stabilize before
proceeding with the hot zone over temperature test below.
Preparations If the instrument is at room temperature, it will be necessary to heat both zones of the autosampler
to 50 °C. This test can be carried out at higher temperatures but the warm and hot zones must both
be at the same temperature, between 50 °C and 130 °C, before commencing the test.
The PL-GPC 220 must be in RUN mode for this test.
Remove all sample vials except Vial 0 if necessary.
Disconnect both power cords from the instrument and call your local Agilent Service
Department for assistance.
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