RH300 V1.4 11/04
5
RESET
MX/MN
RESET
MX/MN
CALIBRATION
The following verification and calibration procedures require the 33% and 75% RH reference
bottles which are supplied with the Model RH305 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 10 minutes
3. Verify that the reading is within the accuracy specification
Relative Humidity Calibration (33% and 75%)
33% Calibration
1. Ensure that “DP” and “WB” appear in the bottom displays before turning 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 °C/°F button, press and hold the ON/OFF button for 2 seconds
to enter calibration mode.
5. “32.8%” will flash on the LCD screen and “DP” and “WB” will display “_ _ _ _”. 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 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 button for 2 seconds to enter the 75% calibration.
4. “75.3%” 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: If the salt at the bottom of the calibration bottles appears dry, the bottles should be
replaced.
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