GasClam 2 Instrument User Manual
Ion Science Ltd.
Unrivalled Gas Detect
ion.
ionscience.com
12
External Power Supply
WARNING
: The external power supply and communications can only be designed and installed by persons
suitably qualified and trained while adhering to national and local standards and regulations.
A GasClam 2 can be powered by an external power supply using either
the optional
“External Power and Com Cable” which is 10m long or for
longer distances using the optional “Junction Box” and a suitable cable.
Either cable is then connected to the external power supply via barriers
which must have the following parameters to maintain intrinsic safety.
External Power Supply Parameters
Nominal Voltage Un ................................ = 12V DC ±10%
Power Output Pn .....................................
≧
5W
Maximum Voltage Uo .............................
≦
15.6V
Capacitance Co ........................................
≧
600pF + C cable
Impedance Lo ..........................................
≧
0.2mH + L cable
Remote Data Acquisition
Stand-alone with external power
If the stand-alone solution requires monitoring with more frequent logging
intervals which would be outside the capability of the battery packs it is also
possible to power the GasClam 2
via the optional “Junction Box”.
The external power supply and barriers must have the parameters defined
above to maintain intrinsic safety.
Custom remote data with external power
The optional “External Power and Com Cable” (as above) can also be used t
o
access logging data or change GasClam 2 settings from outside the hazardous
area. Cable length is 10m which is the maximum guaranteed distance for the
GasClam 2 RS232 interface.
Battery Life and Sample Count
The battery life and the number of samples taken will depend on the battery type, the operating temperature,
humidity and the logging interval.
All batteries will have reduced maximum lifespans at low temperatures.
Power Supply
Voltage
[V]
Capacity
[Ah]
Operating
range
[°C]
Maximum Number of Samples for
Logging Interval
(1)
Nominal Battery Life
in days for Interval
(2)
5 min
15 min
1 hour
15 min
1 hour
Alkaline Duracell 2x
3.0
13.5
0
–
50
197
963
963
8
32
Ni-MH Rechargeable
2.6
9.5
0
–
40
680
666
666
5
23
GasClam 2s without batteries
