Maintenance - Novasina LabTouch-aw Operating Instructions Manual

10.

Maintenance

Cleaning of the instrument
10.1.
Cleaning the aw-measurement cell „CM-2 or CM-3"
10.2.
Cleaning the Infrared „IR" sensor
10.3.
Periodic Recalibration with Humidity Standards
10.4.
Replacing Protective Filters
10.5.
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The following chapter describes the main maintenance task which can be
performed by the user himself.
For cleaning the instrument just use a soft tissue and pure water. If necessary
use mild detergents in addition. NEVER use cleaners containing aggressive
and/or oxidizing chemicals . Make sure you dry the chamber thoroughly dried
after cleaning to avoid wet residuals and hence an influence on the coming
water activity measurements. If the outer parts need to be cleaned, be aware
that some areas of the instrument are not sealed and water can enter the
instrument. Best way is to use a wet tissue as well to remove dirt and dust.
Caution !
Before cleaning, switch off the LabTouch-aw and disconnect it from the mains.
Please do NEVER clean the sensor itself, neither the green/brown
protection filter in front of it. The sensor is a very sensitive element with a che-
mical filter protection on the top. Every cleaning with chemical or mechanical
means (touching, pressurized air cleaning, etc.) will destroy the measuring
sensor inevitably. Possible warranty claims expire instantly.
Clean the IR sensor with a humid cotton bud. Watch out not using strong forces
on the window of the IR-sensor. A contaminated IR-sensor leads to longer
measurement times but not to wrong measurements.
Like all precision measurement instruments, the LabTouch-aw must be chek-
ked periodically and if necessary recalibrated. This procedure was already
described in the chapter 8. Only in this way you can ensure the accuracy of
your measurements. The Novasina SAL-T humidity standards are applicable
for this procedure. If required the standards can be provided with an certificate
issued by international accredited lab.
Always use protection filters to protect the measuring sensor from contamina-
tion by unwanted particles or 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.
Such chemical protection filters have to be replaced periodically due to the fact
that they get saturated. Filters can increase the measurement time and they
incativate the IR-temperature measurement.