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forces on the window of the IR-sensor. A contaminated IR-sensor leads to longer
measurement times but not to wrong measurements.
13.4 Periodic Verification and calibration with Humidity Standards
Like all precision measurement instruments, the LabMaster-aw neo must be
checked periodically and if necessary recalibrated. Please head back to chapter
6 to learn more about verification and calibration . The Novasina SAL-T humidity
standards are suitable for this procedure. If required, the standards can be provi-
ded with an certificate issued by international accredited lab.
13.5 Replacing Protective Filters
Always use at least the provided mechanical protection filter to protect the
measuring sensor from contamination by overfilled sample cups. In addition, it
might be necessary to use a chemical protection filter to protect sensor from
volatile components. Various filters are available for different type of volatiles.
Please consult the filter selection data sheet or contact your local Novasina agent
if you need help.
As the filters are fixed by magnet, use the service tool which is located in the salt
standard case to take exhausted filters away and mount fresh ones back.
Such chemical protection filters have to be replaced periodically due to the fact
that they get saturated. As filters do not cover the IR-sensor, measurement time
will not be elongated nor disturb the temperature measurement of the sample.
Novasina provides the following chemical protection filters for the LabMaster-aw
neo:
eVC-18 filter:
Protects against short-chained organic acids as acetic and formic acid and other
carboxylic acids (butyric acid etc) and oxidizing agents as hydrogen peroxide and
chlorine and as well againts diluted sulfur dioxide.
eVC-18 / eVALC combination:
Protects against essential oil or other strong aroma. Works best with awSens-
ELS.
Redox filter:
Protects against volatiles containing primary and secondary alcohols (attention,
ethanol is an exception, gylcerin, glycols, PEG, perfumes, flavours etc.
In addition, the following sensors are available:
awSens-ENS
Standard sensor for most application except for measurement samples contai-
ning ethanol and/or essential oils
awSens-ELS
Special sensor, resilient against alcohol and certain polyalcohols. Must be used
for samples containing alcohol and/or essential oils / strong aroma
13.6 How to Check Chemical Protection Filters for Saturation
All filters are apsorption-type, thus they will become saturated after some time
and loose their functionality. It is of crucial importance to check the filter for
saturation. Please proceed as follows:
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