
2. Getting Started
8
<Atmospheric Pressure Correction>
When atmospheric pressure at a measuring site is abnormal (such as at high altitude), follow steps below to set
atmospheric pressure (default setting: 1013hPa).
Since the change of weather does not significantly affect the atmospheric pressure as long as the measuring site
is same (excluding the case of typhoon), once you set atmospheric pressure, you do not need to set it every time.
Display
Procedure
Press key to bring up the MENU screen.
Use key to select “7.CALIBRATION”, and press key.
Use key to select “4. ATMOS. PRESS SET”, and press key.
Use
key to set atmospheric pressure value, and press key.
Use
key to select “5. SAVE INFO”, and press
key to go
back to the MENU screen and the setting is completed.
2.5.2 Temperature Measurement Precautions
The response time for temperature measurement improves as the air flow increases. Wait for the reading to
become stable before taking the data.
When a measurement is performed in a no-airflow condition, the air temperature reading may become higher
than the actual due to the heat generated by the lamp. It is recommended that the measurement is performed in
an environment with at least 0.1m/s airflow to obtain accurate readings.
2.5.3 Humidity Measurement Precautions
If a measurement is performed in the place where the humidity is high for a long period of time or temperature
changes rapidly, humidity reading may become exceedingly high due to dew condensation. When dew
condensation is built up, leave the probe in the atmosphere of less than 40%RH for 24 hours to dry it out.
-- Comparison with Assman Aspiration Psychrometer --
The quality and accuracy of IAQ Monitor’s humidity measurement function is ensured by strict calibration with
traceability in Japanese National Standards of JEMIC (Japan Electric Meters Inspection Corporation). This
instrument provides stable measurement as an electronic hygrometer, so it can be used as Assman Aspiration
Psychrometer. Assman Psychrometer sometimes reads higher humidity comparing to the IAQ Monitor since
handling methods such as how to wrap the wet bulb by gauze or how to handle the dirt affect Assman
Psychrometer. Assman Psychrometer shall be handled with care. For more details on handling Assman
Psychrometer, refer to the Japanese Industrial Standard (JIS) Z 8806 Humidity - Measurement Method.
Summary of Contents for 2212
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