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iGAS Operating Instructions, Issue 6, Apr 2018
POWER MANAGEMENT AND SLEEPING
The instrument is fitted with a 6 Volt, 5 cell NiMH battery.
If the battery voltage drops below 5.5 Volts, measurements will stop and the current sample
will be terminated and the
Dead battery
Fault Flag will be set. If the battery drops below 5.2
Volts the instrument will go into a low power sleep to conserve energy (regardless of the state
of the
AllowToSleep
flag). The
Dead Battery
flag will only be cleared when the battery voltage
has recovered to > 5.8 Volt
The
Low Battery
Fault Flag is set when the battery voltage drops below 5.8 Volt. An existing
sample will continue but a new sample cannot start while that flag is set.
When the instrument is on-charge the red light is always on.
The iGAS internal battery capacity is 2000 mAH. The battery is intended to keep the instrument
operating if the ex12 Volt power disappears. Assuming a full charge, iGAS will continue
to operate without external power for about 10 hours.
If the battery is discharged, a full recharge will take about 12 to 14 hours with the instrument
automatically switching on before then when the battery reaches 6.5 Volt.
The battery is not required for data storage and the instrument uses flash memory to store the
results. Data retention is more than 100 years.
When you have finished using the instrument, it is good practice to clear the
Automatic Start
flag, stop the instrument sampling, and set the
Allow To Sleep
flag. This will allow the
instrument to sleep until next required while only slowly discharging its battery. You can do
this by clicking
Hibernate
in AirQWeb. Remember, if you wish to turn off for several days, you
must isolate the battery by clicking the isolator switch to 0
