Option Description
Interferences enabled during
calibration
Make sure this is disabled by unchecking the box.
Zero calibration bottle Make sure this is disabled by unchecking the box as it is not relevant
for this sensor.
2. Exit from the configuration screen by pressing OK.
3. Select Calibration and perform a manual zero calibration as described in Zero calibration
on page 23. For high range sensors perform an additional 100% humid air calibration as
described in 100% humid air calibration (high range sensors only) on page 23.
9.2.2 Manual calibration
Manual calibrations can be made at any time by following these steps:
1. Remove the sensor from the sample line.
2. Rinse the sensor head with clean water.
3. Wipe the sensor head with a clean soft tissue to remove any excess moisture.
4. If using the supplied calibration device insert the sensor into the sensor holder on top of the
calibration device. If not using the calibration device insert the sensor into the flow chamber.
5. Flow the calibration sample through the calibration device or flow chamber as applicable. If using
the calibration device fully open the valve on the pressure reducer to give a gas flow rate of
0.1 L/min. If you are not using the supplied calibration device with pressure reducer the maximum
allowable inlet pressure must be no more than 2 bar absolute.
6. Configure the calibration as described in Calibration configuration on page 22.
7. Start the calibration as described in Zero calibration on page 23, 100% humid air calibration
(high range sensors only) on page 23 or High level adjustment on page 24 depending on the
preferred calibration method.
9.3 Calibration configuration
Note: This option can also be invoked by pressing the Modify button in either the Zero calibration or High level
adjustment calibration screens.
1. From the Main menu, select Calibration followed by Gas sensor and then Configuration.
Option Description
Auto-calibration Not available for this sensor.
Manual-calibration When Auto-End is enabled a manual calibration will complete automatically when
the parameters defined in Stop parameters are reached. Press on Configure to set
the manual calibration parameters. If the calibration fails, the previous calibration
parameters remain unchanged and a warning message displayed.
Hold during
calibration
If checked this keeps the last measured value and stops updating the outputs during
the calibration or verification process. This avoids sending invalid information to any
connected device. At the end of a calibration, this hold remains on for a further
10 minutes to allow the system to stabilize.
Interferences
enabled during
calibration
This option enables the Chlorine or Salt interference during calibration. This option
must be used if there is chlorine in the calibration solution and if the chlorine
interference correction is enabled during measurement.
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