MAINTENANCE WITH Q&A
Page 5-16
On humidity units, a water
atomizing nozzle is used to
create humidity. With clean
water, the nozzle and fi lter
should be cleaned every
three months or 500 hours
of us, whichever comes
fi rst. If clean water is not
available, please install a pre-
fi lter (40 micron) at the inlet.
Please refer to the cleaning
procedure described above.
NOTE
On units with a recirculating
water option, drain and clean
reservoir every two months
or sooner as required by
usage and water conditions.
NOTE
When using a separate
handheld humidity sensor
for checking humidity readings
in the chamber, the probe
must be given at least 1
hour to stabilize within the
chamber after insertion. Also
be aware that the error
of the chamber probe and
error of the handheld must
be taken into consideration
when comparing readings.
If the chamber probe has an
accuracy of + or - 3% and the
handheld has an accuracy of
+ or - 2%, the reading can be
off by as much as 5% and still
be accurate.
NOTE
CLEANING THE ATOMIZING NOZZLE (FLUID CAP)
1. To clean you will need a 12" (31 cm) piece of stranded electrical wire.
2. Strip back 4" (11 cm) of the wire at one end and 1" (3 cm) of the wire at the
opposite end.
3. Use the 4" (11 cm) section of the wire and separate one strand to clean the
end of the fl uid cap.
4. Use the 1" (3 cm) section of the wire to clean the other end of the fl uid cap.
5. Blow out the fl uid cap with compressed air and reassemble.
MAINTAINING THE HUMIDITY SENSOR
Please refer to the Vaisala manufacturer's manual for maintenance and
calibration information regarding the humidity sensor and its components.
Be aware that there is an allowable tolerance for humidity readings:
1. < 90% + or - 2% and > 90% + or - 3% for the sensors within the chambers.
2. Handheld accuracy is typically + or - 2% for quality instruments.
The recommended interval for calibration at least once a year. It is also
recommended to calibrate the sensor if it is not operating within its stated
accuracy limits.
The filter on the end of the
humidity sensor must be in place
for the sensor to operate properly.
Operating the sensor without the
fi lter will damage the instrument.
CAUTION
!
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