ION GASCLAM 2 Software Manual page 9

GasClam 2 Software Manual
4) 12 V External dc power supply
(Ext) Nominal voltage 11.7 V
Minimum auto-select voltage > 10.5 V Stop logging sleep
voltage ≤ 2.5
Maximum voltage < 13.1 V
3.3.2. Battery Life and Sample Count
The battery life and the number of samples taken will depend on the operating temperature, humidity and the
logging interval of the chosen battery type. All batteries will have a reduced life at low temperatures.
Power Supply Voltage
(V)
Alkaline Duracell 2x 3.0
NiMH Rechargeable 2.6
Li Long Life Primary 7.2
(1) The "Maximum Number of Samples" depends on actual operating temperature, the number of gas
sensors and the state of the filters. Values in the table are for 20 °C with the maximum number of sensors and
clean filters.
(2) The "Nominal Battery Life" is a conservative calculation of the number of days a battery should last under
"nominal" conditions (fully charged battery at start, operating temperature 20 °C, clean filters and all sensors).
Values in the table are 80% of the average calculated value. Other factors such as relative humidity can also affect
the battery life.
3.3.3. Alkaline Batteries
Alkaline batteries are useful for initial checks and can be used for immediate deployment in the field when the
rechargeable battery is not charged. However, for normal field work it is recommended to use either the NiMH
rechargeable or Li long-life battery packs.
The Duracell batteries can be stored in the instrument case as a reserve because they have a long "shelf life" but
do not use them after the date shown on the battery. Also they are not suitable for short logging intervals (less
than 15 minutes).
Important: when a GasClam 2 is to be stored for more than 2 months it MUST be fitted with the Duracell
batteries to maintain the electronics.
3.3.4. NiMH Rechargeable
The NiMH rechargeable battery packs should be fully charged using the charger provided (see instructions) and
used for logging as soon as possible. Rechargeable batteries do not have a long "shelf life" as they will self-
discharge over time.
This also means that battery life is not proportional with an increase in logging interval, e.g. if the logging interval
is increased from 1 hour to 12 hours the nominal battery life will not increase 12 times to 276 days (9 months).
The NiMH batteries self-discharge at a rate of 15% - 20% per month.
Unrivalled
Capacity Operating
(Ah)
range (C)
13.5 0 – 50
9.5 0 – 40
19.0 0 – 50
Detection.
Maximum Number of Samples for
Logging Interval
(1)
5 min 15 min
197 963
680 666
x 2937
ionscience.com
Ion Science Ltd.
Nominal Battery Life in
days for interval
1 hour 15 min
963 8
666 5
2937 24
(2)
1 hour
32
23
98