Chapter 5 — Maintenance and Troubleshooting Page 35
Chapter 5 — Maintenance and
Troubleshooting
Introduction
There are two levels of maintenance on the Humilab: basic system
maintenance and reference measurement maintenance.
Basic
maintenance
The following should be checked (every few hours, until the
requirements for your particular application determine a different
schedule):
• check the water level surrounding the calibration chamber
• check the desiccant condition and replace if it has turned
pink
Verifying water level. Water should be added to maintain the level
in the green area of the water level indicator. Be sure to use only
distilled water, and be careful not to accidentally spill water in the
test chamber. If you do spill any water, wipe it up completely.
The water level may pulse up and down while the Humilab system
is operating.
Verifying desiccant condition. Prior to each use of the HumiLab,
verify that the desiccant cartridge contains active desiccant mate-
rial. The desiccant contains an indicating material which turns
from blue to pink as the desiccant is exhausted. Replace or regen-
erate the desiccant granules before the cartridge is completely
exhausted.
To regenerate the desiccant, the granules may be spread in layers
one granule deep and heated for 1 hour at 210° C or 425° F. The
regenerated material should be placed in the original glass or metal
container and sealed while hot. Do not overheat the desiccant.
Replacement desiccant can be obtained from GE General Eastern.
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