METER VARIOS, Manual, Page: 50 / 60

46
SERVICE
4. SERVICE
This section contains calibration and recalibration information, calibration frequencies, cleaning
and maintenance guidelines, troubleshooting guidelines, customer support contact information,
and terms and conditions.
4.1 SENSOR VERIFICATION
The advantages for using glycerin as a verification standard are listed below:
• Exact thermal conductivity measurement value is known.
• There is good thermal connection to the sensor, and no risk of an air gap between
material and needle sensor.
• Material has high viscosity and reliable measurement values even at temperature changes.
The thermal conductivity value of the standard material delivered with the VARIOS sets, is
defined by 0.285 W/m
×
K at 25 °C.
There are two verification adapters that must be used with the glycerin verification vial: the
lower adapter and the the upper adapter.
Glycerin vial Upper adapter Lower adapter
Figure 44 Glycerin verification vial
NOTE: The glycerin needs to be replaced annually, and is labeled with an expiration date. Use USP-grade glycerin, or
order a replacement vial. Vials of glycerin can be ordered by contacting
Customer Support .
NOTE: Store the glycerin standards in the lab at room temperature and in a dark place (e.g., in a cupboard). Be sure
that the standard is not exposed to direct sunlight and heat sources.
Below are instructions for setting up the glycerin, adapters, and the sensor for verification.
1. Place the glycerin vial next to the VARIOS.
2. Connect the sensor needle to be verified next to the VARIOS.