IN-E-HyFlex-V4_10
Rotronic AG
Bassersdorf, Switzerland
Document code
Unit
Instruction Manual
Document Type
HygroFlex transmitter version 4: instruction
manual
Document title
Page
43
of 61
© 2006; Rotronic AG IN-E-HyFlex-V2_10.doc
The operating limits at the probe depend on the probe model and are specified separately for each
probe.
11 Maintenance
11.1 On-site maintenance
a) Probe
maintenance
Each HygroFlex transmitter has a test connector that is located on the connection plate.
The HygroPalm 2 and HygroPalm 3 portable indicators can be connected to this
connector with cable AC1620. Using the probe of the HygroPalm as a reference, any
HygroClip digital probe connected to the transmitter can be read and adjusted at one
humidity and temperature value. When adjusting against a reference probe, please make
sure that both probes are exposed to the exact same environment and are at temperature
and humidity equilibrium. Ventilation of both probes (same air stream) is highly
recommended.
b) Validation of the analog outputs
With the exception of the analog probe input and analog output circuits, the HygroFlex
uses digital circuits that are by nature immune from drift. The HygroFlex uses analog
circuits that are very stable. These circuits should not exhibit any noticeable drift for many
years. If so desired, the analog input and output circuits can be validated by substituting a
test connector for the probe. The test connector
AC1618/50
simulates a HygroClip probe
and generates digital and analog signals corresponding to 50%RH and 25
°
C (77
°
F). The
output signals can be read with a DVM (open the transmitter housing and disconnect the
analog output plug-in terminal block).
11.2 Factory / metrology lab. maintenance
The HygroFlex should not require any routine maintenance other than validating the analog probe
inputs (if used) and the analog outputs. Please, contact the factory if the analog outputs require an
adjustment.
11.3 Maintenance of the ROTRONIC probes
Cleaning or replacing the dust filter
Most ROTRONIC probes come with one of the following types of dust filter: (a) protective
metal base with a removable filter cartridge or (b) plastic slotted cap with built-in (not
removable) filter element.
Depending on the conditions of measurement, the filter should be checked from time to time. If
the probe has a removable filter cartridge, this can be easily removed for cleaning.
