Checkline RH6 - Manual (Page 5)

 Electromatic Equipment Co., Inc.
-16-
19.0 COMMON REASONS FOR INCORRECT MEASUREMENTS
• Sunlight or other sources of heat or cold that doesn´t correspond to the
surrounding temperature
• Dripping or sprayed water
• Irreversible damage of the sensor due to aggressive gases
• Danger of condensation because of changing temperature
• Polluted moisture sensor
• Foreign objects on the sensor
• Measuring errors due to too short conditioning
To demonstrate the importance of temperature adjustment, the table below shows
measuring errors due to a temperature difference of only 1°C / 1.8°F between the
measuring instrument and the substance to be measured at different ambient
temperatures.
10°C (50°F) 20°C (68°F) 30°C (86°F)
10%r.h. ±0,7% ±0,6% ±0,6%
50%r.h. ±3,5% ±3,2% ±3,0%
90%r.h. ±6,3% ±5,7% ±5,4%
At room temperature (20°C / 68°F) and assumed paper moisture value of 50% r.h. a
deviation of 1°C / 1.8°F between the measuring sens or and the substance to be
measured results in a measuring error of 3.2% r.h. A deviation of 3°C / 5.4°F would
result in a measuring error of over 10%.
Further examples can be found in the Mollier h-x diagram.
 Electromatic Equipment Co., Inc.
-5-
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