MO290 Datasheet, PDF (6/8 Pages) Extech Instruments Corporation. – Pinless Moisture/Humidity Meter + IR

Condensation Mode
The Condensation feature alerts the used when the surface temperature as measured by the
IR thermometer is close to or has reached the Dew Point temperature.
1. Press the power button to turn the meter on.
2. Simultaneously press the MOIST/REL and RH buttons. The “COND” icon will appear.
3. Point the meter at a surface, press the IRT button to measure the surface
temperature. The small display will indicate the IR surface temperature and the large
display will indicate the difference between the IR temperature and the Dew Point
temperature.
4. The meter will then report the potential for condensation on that surface in the
following manner
• If the temperature of the IRT is more than 14°C (25°F) above the Dew Point, the
temperature difference shall be displayed, with no other warning.
• If the temperature of the IRT is 3-14°C (5-25°F) above the Dew Point, the
temperature difference shall be displayed, along with a standard Condensation
Indicator icon. The meter shall beep once to confirm that the reading is in the risk
area.
• If the temperature of the IRT is less than 3°C (5°F) above the Dew Point, the
temperature difference shall be displayed, along with a flashing Condensation
Indicator icon. The meter shall beep twice to confirm that the reading is in the high-
risk area.
5. Press the RH button to exit the mode.
Vapor Pressure Mode
1. With the Condensation mode active, press the MODE button to display the Vapor
Pressure in mBAR (°F) or kPa (°C).
2. Press the MODE button to exit the Vapor Pressure mode.
Alarm High and Low Limit Setting
High and Low alarm points can be set for Humidity and Moisture measurements.
Humidity Alarm Set Procedure:
1. With RH% displayed, simultaneously press the RH and MODE buttons.
2. The “HIGH” icon will appear on the display.
3. Press the ▲or ▼button to set the high limit desired.
4. Press the ALARM SET button to save the value and proceed to the LOW set value.
5. With the “LOW” icon in the display, Press the ▲or ▼button to set the low limit
desired.
6. Press the ALARM SET button to save the value and to return to the normal mode.
7. If the humidity measurement is lower than the low alarm setting or higher than the
high alarm setting, the meter will beep once every second.
Moisture Alarm Set Procedure:
1. With MOIST displayed, simultaneously press the MOIST/REL and MODE buttons.
2. The “HIGH” icon will appear on the display.
3. Press the ▲or ▼button to set the high limit desired.
4. Press the ALARM SET button to save the value and proceed to the LOW set value.
5. With the “LOW” icon in the display, Press the ▲or ▼button to set the low limit
desired.
6. Press the ALARM SET button to save the value and to return to the normal mode..
7. If the moisture measurement is higher than the LOW alarm setting, the meter will
beep once every second
8. If the moisture measurement is higher than the HIGH alarm setting, the meter will
beep continuously.
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MO290 V3.0 03/09