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in_hypalm_aw1_v3.doc
Appendix 2: Maintenance of the ROTRONIC probes
Cleaning or Replacing the Dust Filter of the Probe
The dust filter used to protect the probe sensors should be kept clean. When the filter is
dirty, it should be removed from the probe. Do not clean the filter while it is on the probe,
especially if using a cleaning agent. Corroded, discolored or clogged filters should be
replaced.
a) Insertion probe HP28:
Unscrew the pointed end of the probe and slide out the dust filter
b) AW-DIO and AwVC-DIO
The dust filter is held in place by a snap ring. Use snap-ring pliers to free the filter for
removal. Be careful not to touch the sensors while they are not protected by the dust filter.
Periodic Calibration Check of the Probes
Long term stability of the ROTRONIC Hygromer humidity sensor is typically better than 1
%RH per year. For maximum accuracy, calibration of the probe should be verified every 6 to
12 months. Applications where the probe is exposed to significant pollution may require
more frequent verifications.
Both the Pt 100 RTD temperature sensor and associated electronics are very stable and
should not require any calibration after the initial factory adjustment. For routine calibration
checks, the probe should be verified at one or two values of humidity. For more details, see
appendix 3 - Calibration Basics
and
Functions – ADJUST M.PT
.
For users who do not want to get involved with field calibrations, our unique probe exchange
program offers an attractive alternative. This program takes advantage of the
interchangeability of the ROTRONIC HygroClip digital probes. Replacement probes are fully
calibrated and are rehabilitated probes with a brand new humidity sensor and filter.
