ACR Electronics SmartReader Plus Manuel d'utilisateur télécharger pdf (Page 72)

SmartReader Data Loggers

notes packed with each RH probe set -- see Figure 2-2.

Figure 10-2: Connecting the EH-020A Temperature and RH Probe

The EH-020A is applicable for measurements between -20 and 40°C (-4 and 104°F) and 10 to

90% RH.

NOTE: The EH-020A probe is compatible with loggers that have serial numbers

above 20,000 only.

The accurate measurement of temperature and humidity depends primarily on the information

supplied by a particular sensor. IAQ Loggers use temperature and humidity sensors with

rugged qualities designed for minimal or no maintenance (under normal operating conditions).

The IAQ Logger's on-board thermistor is chemically stable and not significantly affected by

aging. It will typically drift less than 0.1°C over a period of several years. The relative humidity

sensor, although subject to accuracy degradation when exposed to contaminants and/or

extreme environmental conditions, will drift typically less than 1% per year (under clean

conditions). You should check your RH sensor periodically and, if necessary, recalibrate or

replace it.

1.12.4 Troubleshooting

If you are getting what appear to be wrong readings, consider the following before recalibrating

the sensors. Sensors sample the atmosphere (or medium) only in the immediate vicinity of

the sensors themselves. The physical state of the atmosphere and its degree of uniformity

and turbulence will limit the validity of a measurement at some distance from the sensor. This

becomes especially apparent for the measurement of ambient temperature and relative

humidity.

In a room, temperature and RH levels may vary dramatically from location to location. Such

factors as air stratification, drafts, and proximity to heat or humidity sources (people,

equipment, moisture, solar gain, etc.) can contribute to a wide variance in conditions even

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ACR Electronics SmartReader Plus Manuel d'utilisateur Page 72