4.1 Calculation of the measurement value based on the sensor analog output
To calculate the value of the measurement, temperature or relative humidity or dew point, starting from
the current or voltage value, apply the formula:
FORMULA: EXAMPLE:
where:
M
low
= lower measurement limit
M
range
= measurement range
U
range
= output measurement range (V or mA)
U
out
= measured output (V oppure mA)
U
low
= lower output limit (V o mA)
With sensor with the following features:
- Temperature range: -50÷100 °C
- Output measurement range: 4÷20 mA
- Measured output: 12 mA
5 Maintenance
This sensor is a precision measurement apparatus. In order to maintain the specified measurement precision
over the time, LSI LASTEM recommends to check it periodically (at least twice a year); it is moreover
suggested the replacement of the measure element according to the place of installation (in persistent
conditions of high humidity, pollution, dust and chemical substances presence, the sensitive element
deteriorate faster than the one placed in a location with less adverse conditions). It is, anyway, a good rule
to replace the sensitive element at least once every two years.
5.1 Cleaning of the anti-radiant shield and the porous filter
Referring to the picture of §5.2, proceed as follow:
1. Remove power from the sensor. Depending on the model, disconnect the cable from the Connector
from DWA cable or from the data logger.
2. Unscrew Shield cable gland and pull down the Stem.
3. Clean the extern side of the Anti-radiant shield with the aid of a small brush or a wet rag.
4. Clean the stem using a wet rag.
5. Unscrew the Porous filter.
6. Clean the filter with a cold air jet.If the filter is particularly damaged, replace it.
After cleaning mount the sensor following the operations described above in reverse order.
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