Anton Paar DMA 4100 Manual De Instrucciones página 32

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Appendix A: Operation at High Air Humidity and/or Low Measuring Temperatures
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For a measuring temperature of 20 °C, a drying cartridge must be used under the
following conditions:
Ambient temperature
20 °C
25 °C
30 °C
The drying cartridge contains beaded ruby gel, a non-toxic drying agent. When
active, the color of the drying agent is red. Ruby gel which has absorbed liquid
turns orange.
Moist ruby gel can be regenerated:
Pour the ruby gel into a glass bowl and blow hot, dry air (max. 130 °C) through it
for approx. 5 hours or place it in a laboratory oven for a few hours (or over night)
until it is red again.
Important:
Do not use higher drying temperatures than 130 °C, otherwise the indicator
function of the ruby gel will be destroyed.
Preventing condensation in the measuring cell block
To prevent condensation in the measuring cell block, connect a dry air supply to
the "DRY AIR INTERNAL" nozzle at the rear of the DMA (see Fig. A - 1).
Important:
Never connect hoses containing liquids or moist gases to the "DRY AIR
INTERNAL" nozzle as this may lead to damage of the electronics.
The dry air supply must be used additional to the drying cartridge if the measuring
temperature is more than 5 °C below the ambient temperature.
The following specifications of the applied air are required:
- 0.2 to 0.3 bar (2.9 to 4.4 psi)
- Class 5 from ISO 8573-1
Max. particle size: 40 µm
Max. pressure dew point: +7 °C (44.6 °F)
Max. oil content: 25 mg/m
Relative air humidity (RH)
> 70%
> 50%
> 38%
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