Cub Instrument User Manual V2.4
Unrivalled Gas Detect
ion.
Page 33 of 46
ionscience.com
•
The table below assumes the use of 5mm ID Tygon pipe.
Pipe length
Zero Time (sec)
Span Time (sec)
100mm
10
22
200mm
12
24
300mm
14
26
400mm
16
28
500mm
18
30
600mm
20
32
•
Minimum gas concentration is 2 ppm. Demand flow regulators must be used to supply
gas to the Calibration Dock. They must be able to supply 0.3 litres per minute (300
ml/min). The Dock draws as much gas as it needs from the regulator (around 200
ml/min).
2.
On the
, click this button for the Cub being calibrated:
•
The calibration procedure is then initiated. The Calibration Dock then pumps Zero gas
and then Span gas to the sensor. If the calibration is successful, a date/time stamp will
appear in the
Calibration
column. Readings will appear in green.
•
If calibration fails, readings will appear in red and a message will be displayed giving the
reason for the failure:
o
Invalid
: when the Cub is initially connected to the Docking Station this message will
appear to advise the user that the Cub does not have a valid calibration.
This error also appears if a communication error occurs during calibration.
o
Span too low:
the span gas concentration is not sufficient.
o
Zero too high
the zero reading is too high, such as when drawing in dirty air.
o
Lamp fail
: the lamp failed to strike.
•
If a calibration is invalid, the Cub will revert to the previous calibration.
Remote Calibration
The following equipment is required.
•
A clean ambient air supply or a bottle of compressed synthetic air fitted with a 0.3 liter per
minute flow regulator (
1
).
•
A bottle of compressed Span gas fitted with a 0.3 litre per minute flow regulator (
1
).
•
Remote calibration adaptor (
3
).
•
Suitable pipe (Tygon) to connect gases to the remote calibration adaptor (
2
).
