Controls, Indicators, and Displays
SORVALL
®
Centrifuges
3-16
SAMPLE OVERTEMP – PRE-COOLING
The RUN display temperature was more than 2°C above the
SET temperature either when START was pressed, or during
a STEP RUN at a moment when the programmed SET
temperature changed. Press CLEAR to continue the run as a
Precool run, or press STOP to terminate the run to remove
sample before precooling the chamber to SET temperature.
During a Precool run, P-COOL replaces the DEG C field
header in the SET display until RUN temperature is within
2°C of SET value.
SAMPLE TEMPERATURE OVER LIMIT
During a run, when the pre-cool feature was not active (see
SAMPLE OVERTEMP – PRE-COOLING, above), the RUN
display temperature went above the maximum allowable
(overtemperature limit) setting. Check all possible causes:
a. SET temperature too low for rotor/speed combination,
b. overtemperature limit too close to the SET temperature (see
page 3-10, CH
c. ambient air temperature at the centrifuge inlet > 35°C,
d. centrifuge air inlet blocked or proper clearance not observed
(see page 2-2, Location).
Check all possible causes before contacting Thermo Service. (WatchLog
Network™ record: OVERTEMP.)
SAMPLE TEMPERATURE UNDER LIMIT
During a run, when the preheat feature was not active (see
SAMPLE UNDERTEMP – PRE-HEATING below), the RUN
display temperature went below the minimum allowable
(undertemperature limit) setting. The limit setting may be
too close to the SET temperature (see page 3-11, CHANGE
UNDERTEMPERATURE LIMIT) – try setting a lower
undertemperature limit. If the problem persists, there may be
a refrigeration system problem. Contact Thermo Service.
(WatchLog Network™ record: TEMP. UNDER LIMIT.)
SAMPLE UNDERTEMP – PRE-HEATING
The RUN display temperature was more than 2°C below the
SET temperature either when START was pressed, or during
a STEP RUN at a moment when the programmed SET
temperature changed. Press CLEAR to continue the run as a
Preheat run, or press STOP to terminate the run to remove
sample before preheating the chamber to SET temperature.
During a Preheat run, P-HEAT replaces the DEG C field
header in the SET display until RUN temperature is within
2°C of SET value.
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