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Select a SAL-T standard which has an aw-value close to the products which are
normally measured with the instrument.
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If the calibration interval gets shorter (i.e. from 30 days to 20 days) at least two
times in a row, replace the filter. The more frequent calibration is an indication for
sensor contamination.
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Proceed with verification with tol/- 0.005aw
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If verification fails, perform calibration an note date.
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By replacing the filter, you get an idea about the exchange internval (install date to
exchange date) and you can define a standard filter exchange interval.
Important !
Def
ective or wrong mounted filters do not fullfil their function and provide the risk of
instrument or sensor damage. Such filters must be replaced immediately.
13.7 How to Change a Measurement Sensor
If a measurement sensor is treated correctly (by using appropriate chemical filter pro-
tection if necessary), lifetime should be around 3-5 years.
If a sensor is defective or cannot be calibrated anymore, a replacement must be done.
Please procced as follows:
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Make sure you ahave a replacement sensor available. If not, contact your local
Novasina agent to order one
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Switch off LabMaster-aw neo instrument and open measurement chamber
• Take the hexagonal wrench which is located in the salt standard case
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loosen and remove the 3 screw fixing the measurement head
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Pull at the black sealing to remove the measurement head and place it sensor-side
downwards on the table:
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Remove the two small screws, pull out the old sensor and mount the new one
• Fix new sensor with the two small screws
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Mount sensor head back to the instrument and fix it with the 3 long screws
• Switch on instrument