Temperature Alarm; Temperature Stability - Thermo Scientific Accela Open Autosampler Hardware Manual

Temperature Alarm

Temperature Stability

Thermo Scientific
If the sample has to be cooled as low as 4 °C, cool the sample tray first in a refrigerator before
the tray is placed into a stack/tray cooler module. This shortens cool-down time considerably.
An internal alarm point of 55 °C protects the upper limit of a stack cooler module; it is 72 °C
for a tray cooler. Reaching this point in a single fault situation causes the temperature control
unit to automatically force cooling to the fullest extent possible. (The alarm is not audible.) At
the same time a corresponding Error message is displayed. For explanations of these messages,
see "Cooled Stack Power Supply Error Messages"
A fuse to prevent overheating is built in for unattended automated runs.
The Peltier element turns off automatically at 72 ±5 °C.
Only an authorized representative of Thermo Fisher Scientific can replace a damaged
over-temperature fuse.
In case of error, do the following systematically:
1. Check the corresponding error message
page 90).
2. Verify whether the appropriate power supply is being used for the stack cooler and tray
cooler.
3. Turn off the power supply, wait a few minutes, and turn it on again.
Ensure that the alarm is off. If the alarm is still on, observe the corresponding error
message.
The stack/tray cooler is basically a thermostatted sample tray that keeps the analytical sample
below or above ambient temperature.
Thermo Fisher Scientific recommends the following guidelines:
• Switch on the stack/tray cooler at least 30 minutes before the analytical routine run is to
be started at 10 °C or 75 minutes, if operated at 4 °C.
• For high-throughput analysis–typical cycle time of 60 seconds or less per analysis–leave
the drawers open between injections.
• For longer cycle times, use the Accela Open Autosampler option to close the drawer after
each sampling.
You can change the Restore mode to keep the drawer open or closed during a run.
4
Operating the Temperature Controllable Stack Coolers
on page 90.
("Cooled Stack Power Supply Error Messages"
Accela Open Autosampler Hardware Manual
Temperature Stability
on
77