This is the delay time setting for the low alarm. A difference
between the high alarm and low alarm delay that should be noted
at this point is that when you select a value for the high alarm
delay and then turn power off, that value will appear again when
power is turned on again. The low alarm delay however will always
be 20 minutes when power is turned on. The reason for this, if the
delay is set for too short of a time and the compressor goes off, it
will be approximately 10 minutes before the compressor turns back
on. This is due to an internal time delay within the compressor.
The user can change this 20 minutes to a value desired, but when
power is turned off and on again, it will reset to 20 minutes again.
Use the up or down arrow keys to select your time value and press
ENTER.
The displays will change to the following:
This is the value for the alarm band, the amount of temperature
deviation allowed before either the high or low delay timers are
started. Use the up or down arrow keys to select your value and
then press ENTER and the displays will return to their normal
operation.
8. CALENDAR - The clock key allows the hours, minutes, and day of
the internal clock to be set. To set the internal clock, select
Configuration mode 2. To set the date, month, and year, follow these
instructions:
A. Press and hold the up or down arrow keys and then press the
ENTER key and the displays will change to the following:
Use the key to select 02 and then press ENTER. The displays will
change to the following:
A number other than 01 might be shown.
This is the day of the month selection. Use the up or down arrow
keys to select the correct date and then press ENTER and the
displays will change to the following:
Plant Growth Chamber
3-9
Thermo Scientific
Section 3
Operation and Calibration
