Galltec+mela FK80J Panduan Memulai Cepat - Halaman 4
Jelajahi secara online atau unduh pdf Panduan Memulai Cepat untuk Aksesori Galltec+mela FK80J. Galltec+mela FK80J 4 halaman. Humidity-temperature sensor
Checking calibration
It is possible to use sensor checks in order to test the humidity sensors from time to time for accuracy. The physical
process is described in detail in DIN 50 008, IEC Publikation 260, ISO/R 483-1966. In the air space above an aqueous
saturated saline solutaion an ambient climate is formed whose air humidity is dependant on the water vapour pressure
of the saline solution.
The Galltec+Mela sensor checks are designed so that a foil permeable to vapour is positioned between the saline solution
and the air space (space in which the measuring element is located). This makes carrying out the sensor checks a very
straightforward procedure as follows:
Remove the protective cap of the sensor check
while opening the PG screw and introduce
the sensor duct up to the mark. Tie the sensor
in the PG screw. Please make sure that the
sensor check is well tight and air-sealed while
caring out your measurement. If you are using
a sensor with a "Polyga" measuring element,
ensure particularly that the lid of the sensor is
well tight and that the cable duct is well sealed.
After a certain period of time, a constant humi-
dity builds up between the saline solution and
the air space in which the humidity measuring
element is located. Depending on the type of
saline solution and the sensor check, humidity
values range from 33%RH to 98%RH. The stan-
dard values of the Galltec+Mela sensor checks
are 33%RH, 55%RH, 76%RH and98%RH. We
recommend a compensation period of about 2 hours. Please ensure that there are no major fluctuations in temperature
during this period. Temperature fluctuations severely disturb the equilibrium.
The equilibrium moisture content is dependent on the temperature - according to the type of salt. The corresponding values
are given in a correction table located on the sesnsor check.
It is important that you replace the sealing cap of the sensor check after use, otherwise the water of the saline solution will
evaporate and the check will become unusable.
Guide to installation
Interference is often to be encountered during installation. The correct installation procedure can prevent interference to
a very large extent. However, some ground rules should be observed.
To avoid interference, suppression should be carried out in accordance with VDE 0875 and VDE 0874
(VDE - this is assumed to be the Vorschriftenwerk Deutscher Elektrotechniker - regulations governing German
electrical engineers).
Fundamentally, interference must be removed at its source, where suppressor material is most effective. Interference can,
however, also result from electromagnetic fields via signalling lines. The EMV law determines the corresponding protective
measures. All Galltec+Mela equipment is designed in accordance with European standards EN 50081-2 and EN 50082-2
(for industrial locations). In addition, further protective measures must be observed.
Unavoidable sources of interference should be kept at a good distance from the control systems.
Data and signalling lines should not be used in parallel with control, networking and power lines.
For data and signalling lines, shielded cable should be used, and the shielding must be applied to the earth
terminal. Ensure that earth circuits and fault currents do not arise as a result of a second earth connection.
For equipment with a network connection, it is recommended that a separate network circuit is used.
During the switch process, electrical power consumers such as switch contactors, magnetic valves etc. pro-
duce induction voltages that can cause interference. In the trade there is an abundance of protective and
suppressor component parts that are most effective when applied directly to the source of the trouble. A
suitable suppressor has the added advantage that components such as relays, microswitches etc. have a
longer service life.
Further difficulties during installation can arise if signalling lines are joined together with common lines. It is essential to
check whether this is permissible. Interference is particularly likely when installing using equipment of different makes.
Here, too, the trade offers isolating amplifiers that overcome the problem.
Sensor check
°C
33%rh
%rh
Screw the check firmly onto the humidity sensor. Wait for 2 hours. Ensure that the temperature is
kept constant. Take humidity reading according to temperature.
Sensor check
°C
55%rh
%rh
Screw the check firmly onto the humidity sensor. Wait for 2 hours. Ensure that the temperature
is kept constant. Take humidity reading according to temperature.
Sensor check
°C
76%rh
%rh
Screw the check firmly onto the humidity sensor. Wait for 2 hours. Ensure that the temperature is
kept constant. Take humidity reading according to temperature.
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