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6
Maintenance
6.1
Cleaning
If needed, the sensing head of the humidity probe can be cleaned by the user (see cleaning instruction
- www.epluse.com/cleaning-instructions). The EE07-MT probe does not require any special cleaning
because the temperature sensor is encapsulated in the stainless steel body of the probe.
6.2
Filter Replacement
In a dusty, polluted environment it might be necessary to replace the filter cap once in a while. In most
of the cases, a clogged filter shows visible contamination or dirt. Longer response time of the RH
measurement also indicates a clogged filter cap. In such cases, replace the filter by a new, original one,
see data sheet "Accessories".
Procedure:
• Turn the filter cap counter-clockwise for removing it.
• Install the new filter cap fingertight by turning it clockwise
6.3
Adjustment and Calibration
6.3.1
Definitions
Calibration
The 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
The 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. The 2-point adjustment is recommended for best accuracy over
a wide RH and / or T range.
6.4
RH and T Calibration / Adjustment
• One point (offset) calibration/adjustment at ambient T can be easily performed by comparison with
an adequate RH and a T reference. The E+E Omniport 30 handheld device can serve for instance as
such reference. Omniport 30 can be optionally supplied with an accredited calibration certificate. See
E+E calibration brochure at www.eplusecal.com.
• For multiple point calibration or 2-point adjustment for RH and T, the EE211 as a whole (both probes)
shall be placed in a climate chamber.
6.4.1
Adjustment Procedure
• Connect the EE211 to the a Windows PC, using the EE-PCS Product Configuration Software and the
optional USB configuration adapter HA011066.
• EE-PCS (free download from www.epluse.com/configurator) shall be installed on the PC.
• Start EE-PCS and proceed with 1 or 2-point adjustment of the RH and of the T reading.
Please note:
The adjustment data is stored in the main electronics board of the EE211. The factory adjustment of
the heated humidity probe and of the T probe is not altered. In case of replacing of theT probe it is
necessary to return to the factory setup of EE211.
12
Operating manual EE211 Heated humidity and temperature sensor
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