GasClam 2 Instrument User Manual
Ion Science Ltd.
Unrivalled Gas Detect
ion.
ionscience.com
23
Fault Finding
Software
The primary fault finding
tool is the “Error Log” which can be checked after downloading a set of logging data and
the “Error Box” in the software’s home window (see Software Manual).
The Effects of Flooding on Data and the GasClam 2
When the GasClam 2 unit is not taking any samples it has a protection rating of IP68, however immersion will effect
data and may require subsequent corrective action.
These effects and requirements will differ whether immersed from above (flooded Headworks) or from below (rise
in borehole water level) see table below:
Flooded Headworks
Remedial Action
Preventive Maintenance
Effects on
data
Should Vent breather be submerged:
• Atmospheric pressure readings will be
incorrect.
• Scheduled venting will be ineffective.
To replace lost atmospheric data
use borehole pressure as an
approximate replacement or use
data from another source.
If the chamber is known to flood, or is
already full of water:
• Choose another chamber.
• Or replace the Snorkel with a Vent
Plug.
Effects on
GasClam 2
If submerged for an extended period the
vent pipe may become flooded.
The vent breather may become clogged
by dirty water.
When the GasClam 2 is visited
check data and call the service
centre if atmospheric pressure
looks strange, they will advise.
If chamber is liable to flooding:
• Replace Snorkel Filter each visit.
• Position the Snorkel at a higher
location.
Flooded Borehole
Remedial Action
Preventive Maintenance
Effects on
data
Should water reach the base of the Unit
the inflow and outflow valves will close,
no samples will be taken:
• Borehole pressure readings will be
incorrect.
• Gas concentration readings will be
incorrect.
Data points for the set logging
interval will be marked when
samples have not been taken.
If borehole water level is known to be
high or is already full of water:
• Choose another chamber.
• Or extend the borehole above ground
level.
Effects on
GasClam 2
Should water reach the base of the
GasClam 2 the water proximity
(flooding) sensor will react and the
inflow and outflow valves will close and
no samples will be taken.
A flooding error will be flagged up in the
software.
None
Every time a GasClam 2 is removed from
a borehole the inlet barb should be
checked to see if a water droplet is on it.
If so dry with a cloth.
If there is any chance that water may
have entered the inlet contact your local
service centre and DO NOT start or
purge the GasClam 2.
Potential Problems when GasClam 2 used Below 0°C
If the temperature of the body of the GasClam 2 drops below 0°C and there is high humidity the valves inside may
freeze and prevent correct sampling. This will not damage the GasClam 2 and when temperatures rise above 0°C
it will function correctly.
Another indication that the valves have frozen is that the
O
2
sensor will go off scale either positively or negatively
and the atmospheric pressure reading will also
dramatically increase.
The graph illustrates a cycle between -10 and 10 °C at 98%
RH. When the temperature reaches -5°C O
2
goes off scale
positively and atmospheric pressure increases by 20 mBar.
