RH350/355 V1.7 11/04
5
CALIBRATION
The following verification and calibration procedures require the 33% and 75% RH reference
bottles which are supplied with the Model RH355 kit.
Accuracy Verification
Checking the 33% or 75% RH Calibration
1.
Insert meter’s sensor into the 33% or 75% salt reference bottle
2.
Check the reading after a minimum of 10 minutes
3.
Verify that the reading is within the accuracy specification
Relative Humidity Calibration (33% and 75%)
33% Calibration
1.
Turn the meter Off.
2.
Insert the meter sensor into the 33% salt reference bottle.
3.
Allow the meter one hour to stabilize.
4.
While holding down the
[M
in
/AV
RST
]
button, press and hold the
[ON/OFF
SET
]
button
for 2 seconds to enter calibration mode.
5. “
32.8%
” (reading may vary depending on operating temperature) will flash on the
LCD screen. After 30 minutes, the flashing will stop to indicate that the 33%
calibration is complete. Note: To exit from the calibration procedure before
completion, pressing the
[ON/OFF
SET
]
button will turn the meter off.
6.
Proceed to the 75% Calibration below.
75% Calibration
1. Insert the meter sensor into the 75% salt reference bottle.
2. Allow the meter one hour to stabilize
3. Press and hold the
[M
in
/AV
RST
]
button for 2 seconds to enter the 75% calibration.
4. “
75.3%
” (reading may vary depending on operating temperature) will flash on the
LCD. After 30 minutes, the flashing will stop to indicate that the 75% calibration is
complete.
5. Turn power off. Calibration is now complete.
Note: Frequently check the water level in the salt bottles. Both the 33% and 75%
bottles should be completely saturated with some water present. The bottles are
sealed and not refillable.
