Checkline RH1 - Manual (Page 8)

 Electromatic Equipment Co., Inc.
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5.3 Other instrument functions – Overview
• Manual saving of single measurement values in a measurement series
• Automatic saving of measurement values in a measuring series
• Selection of the automatic saving interval (3 seconds to 4 hours)
• Display of the measuring series and measurement values directly on the
instrument
• Printout of the saved measuring series
• Transfer and saving of the measuring series on a PC
• Display of the memory and battery status
• Selection of the menu language (DE, EN, FR, IT)
• Temperature shown in degrees Celsius or degrees Fahrenheit
• Acti vation of a simple user operation
 Electromatic Equipment Co., Inc.
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6.0 COMMON REASONS FOR INCORRECT MEASUREMENTS
Sunlight or other sources of heat or cold which do not correspond to the
ambient temperature
Measuring errors due to differences in temperature
To show how important it is that the temperature of the instrument is the same
as the temperature of the substance to be measured, 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 m oisture value of 50%r.H.
a deviation of 1°C / 1.8°F between the measuring se nsor 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 are given in the „Mollier i-x“ diagram.
Dripping or sprayed water
Irreversible damage to the sensor element due to aggressive gases
Danger of condensation following temperature changes
Dirty moisture sensor
Foreign objects on the sensor