Appendix C: Measuring under Special Conditions
C76IB003EN-E
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Appendix C: Measuring under Special
Conditions
C.1
Measuring at High Humidity/Low Temperature
Conditions
If the ambient air contains humidity and the measuring temperature is lower than
the ambient temperature, condensation may occur in the measuring cell and
measuring cell block.
Condensation in the measuring cell causes adjustment and measurement errors
in DMA M series instruments and also in any RXA series instruments connected
to them. Condensation in the measuring cell block damages the electronics and
may lead to a failure of the U-view
TM
function (DMA 4500/5000 M). The higher the
difference between the set measuring temperature and ambient temperature and
the higher the air humidity, the easier condensation occurs.
To prevent condensation in the measuring cell
To prevent condensation in the measuring cell, use a drying cartridge (Mat. No.
65085) and connect it to the "DRY AIR IN AIR PUMP" connector at the rear of
DMA M.
Fig. C - 1
Drying cartridge connected
NOTICE
•
Never connect hoses containing liquids or moist gases to the "DRY AIR IN
AIR PUMP" connector as this may lead to condensations in the
measuring cell and subsequently to measurement and adjustment errors.
•
Operate the "DRY AIR IN AIR PUMP" connector only at ambient
pressure.
DRY AIR IN
AIR PUMP
DRY AIR IN
BLOCK
Drying cartridge
