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User Manual EE260 Heated Humidity and Temperature Probe for Meteorological Applications
Decoding of floating point values:
Floating point values are stored according IEEE754 standard. The byte pairs 1, 2 and 3, 4 are inverted
as follows:
MMMMMMMM
MMMMMMMM
SEEEEEEE
EMMMMMMM
Byte 3
Byte 4
Byte 1
Byte 2
Example:
Response [Hex]
Value in decimal
Byte 1 (Register 2 - Hi)
Byte 2 (Register 2 – Lo)
Byte 3 (Register 1 - Hi)
Byte 4 (Register 1 - Lo)
44
C5
00
08
24.625015
6 Maintenance and Service
EE260 does not require any special maintenance, nevertheless for high accurate measurements
especially over wide RH and T ranges it is recommended to calibrate the probe every 12 months. If
needed, the enclosure may be cleaned and the device may be re-adjusted as described below.
6.1 Cleaning
Use a damp soft cloth to remove deposits of dust or dirt from the exterior of the probe. Do not use any
solvents or abrasive cleaning agents and no isopropanol (isopropyl alcohol).
In case of dusty, oily and polluted environment:
Use a damp soft cloth to remove deposits of dust or dirt from the exterior of the probe. Do not use
any solvents or abrasive cleaning agents.
The filter cap shall be replaced once in a while with an E+E original one (see below).
If needed, the sensing element of the humidity probe can be cleaned by the user (see the E+E
6.2 Filter Replacement
In a dusty or polluted environment it might be necessary to replace the filter cap or the filter membrane,
respectively, once in a while. In most of the cases, a clogged filter shows visible contamination or dirt.
Longer response time of the humidity measurement also indicates a clogged filter cap. In such cases,
replace the filter cap or the filter membrane by a new, original one, see chapter „6.6 Spare Parts“.
Procedure
Turn the filter cap counter-clockwise for removing it.
Install the new filter cap finger tight by turning it clockwise.
While replacing the filter cap take very good care to not touch or rub the sensing element.
6.3 Repairs
Repairs may be carried out by the manufacturer only. The attempt of unauthorized repair excludes any
warranty claims.
6.4 RH / T Adjustment and Calibration
In meteorological applications there might arise the need for periodical humidity and temperature
calibration or adjustment.
Definitions
Calibration
documents the accuracy of a measurement device. The device under test (specimen) is
compared with the reference and the deviations are documented in a calibration certificate. During
the calibration, the specimen is not changed or improved in any way.
Adjustment
improves the measurement accuracy of a device. The specimen is compared with the
reference and brought in line with it. An adjustment can be followed by a calibration which documents
the accuracy of the adjusted specimen.
