MAINTENANCE WITH Q & A
79
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 fluid cap.
4. Use the 1" (3 cm) section of the wire to clean the other end of the fluid
cap.
5. Blow out the fluid 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 is 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 filter
will damage the instrument.
On humidity units, a water
atomizing nozzle is used to
create humidity. With clean
water, the nozzle and filter
should be cleaned every
three months or 500 hours
of use, whichever comes
first. If clean water is not
available, please install a
pre-filter (40 micron) at the
inlet. Please refer to the
cleaning procedure
described above.
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.
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