• 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 Cubs page, 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).
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