Casella CEL Indoor air quality monitor - Manual (Page 9)

The alternate function associated with this key is the start function.
Pressing this key in combination with the function key will cause the
MICROTHERM to initialise itself and begin logging. This does not affect
any data currently held within the MICROTHERM as this can be erased
only by reprogramming via the Win
I aq application.
The down key scrolls down through the list of current readings.
Holding the key down for 3 seconds causes the display to scroll
automatically in this direction. The scrolling action will continue until
the key is pressed again.
The alternate function associated with this key is the stop function.
Pressing this key in combination with the function key will cause the
MICROTHERM to stop logging. To resume logging use the alternate up
key function. This does not affect any data currently held within the
MICROTHERM as this can be erased only by reprogramming via the
Win
I aq application.
3.4 Internal Battery
Although the MICROTHERM is primarily a mains powered instrument, it uses an
internal lead-acid battery to retain the program, clock and data while the
instrument is in storage. This internal battery has sufficient capacity to retain
the MICROTHERM’s internal state for a period of 2 months, in the absence of
mains power.
Therefore it is advisable to connect the MICROTHERM to a suitable mains power
supply at intervals shorter than 2 months, in order to recharge the internal
battery and maintain the internal configuration. The charge state of the internal
battery can be inspected from the LCD display of the MICROTHERM, use the up
or down key to bring the “battery” display into view where the battery capacity
is expressed as a percentage with 100% indicating fully charged.
When the MICROTHERM has been programmed and is actively collecting data on
site, it continually monitors the mains power supply and if it detects that the
mains power supply is absent, it will stop data collection until the mains power is
re-established.
During this period of power loss the MICROTHERM only checks for the mains
supply every 15 minutes, in order to conserve battery power. Therefore any
period of mains power loss will cause the MICROTHERM to shut down for at least
15 minutes. Once mains power is detected the MICROTHERM will automatically
resume collecting data as before.
Control Unit
Page 9 of 42
MICROTHERM indoor air quality &
WinIaq Application Software - User Manual