Campbell EE181, Инструкция по эксплуатации, Страница: 21 / 32

Model EE181 Temperature and Relative Humidity Probe
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and rinse off with distilled water. Make sure the filter is connected firmly with
your fingers — do not over tighten.
Check the radiation shield monthly to make sure it is free from dust and debris.
To clean the shield, remove the sensor from the shield. Dismount the shield.
Brush all loose dirt off. If more effort is needed, use warm, soapy water and a
soft cloth or brush to thoroughly clean the shield. Allow the shield to dry
before remounting.
Replace filters that cannot be successfully cleaned. To replace the filter,
unscrew the filter from the probe and pull it straight away, being careful not to
bend or damage the sensors. Before putting on the replacement filter, check the
alignment of the sensors with the probe, and if necessary, carefully correct the
alignment before installing the filter.
A coating of salt (mostly NaCl) may build up on the radiation shield, sensor,
filter and even the sensor element. A buildup of salt on the filter or sensors will
delay or destroy the response to atmospheric humidity.
Long-term exposure of the relative humidity sensor to certain chemicals and
gases may affect the characteristics of the sensor and shorten its life. The
resistance of the sensor depends strongly on the temperature and humidity
conditions and the length of the pollutant influence.
The sensor should be calibrated annually. Please obtain an RMA number
before returning the EE181 to Campbell Scientific for calibration. Please refer
to the Limited Warranty and Assistance sections at the beginning of the
manual.
10. Attributions and References
E+E Elektronik ® is a registered trademark of E+E Elektronik Ges.m.b.H.
Santoprene ® is a registered trademark of Exxon Mobile Corporation.
AASC, 1985: The State Climatologist (1985) Publication of the American
Association of State Climatologists:
Heights and Exposure Standards for
Sensors on Automated Weather Stations , v. 9, No. 4 October, 1985.
(www.stateclimate.org/publications/state-climatologist/NOAA-NCY-
SCBOOKS-SC77097/00000029.pdf)
EPA, 2000:
Meteorological Monitoring Guidance for Regulatory Modeling
Applications , EPA-454/R-99-005. Office of Air Quality Planning and
Standards, Research Triangle Park, North Carolina 27711.
EPA, 2008:
Quality Assurance Handbook for Air Pollution Measurement
Systems , Vol. IV, Meteorological Measurements, Ver. 2.0, EPA-454/B-08-
002 (revised 2008). Office of Air Quality Planning and Standards,
Research Triangle Park, NC 27711.
Goff, J. A. and S. Gratch, 1946: Low-pressure properties of water from -160°
to 212°F, Trans. Amer. Soc. Heat. Vent. Eng. ,
51
, 125-164.
Lowe, P. R., 1977: An approximating polynomial for the computation of
saturation vapor pressure, J. Appl. Meteor. , 16 , 100-103.