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5- Sensors and actuators
When you have nished changing the database settings, upload them to the WMPro by clicking Ap-
ply Database Settings.
If you want to change the name of a sensor, you will need to delete the old database settings and
then create new ones. When you add or remove values to/from a database, the WMPro will be un-
able to correctly interpret the remaining data. To prevent errors, the databases are erased when
you change the denition, and the entire history is lost. Turn to section 10 to nd out more about
databases, including how to create backups.
5�3 Temperature sensors
When you connect a temperature sensor you can choose
from a number of standard types in the drop-down list
box. There is a table on the next page, explaining the vari-
ous types.
You can scale the temperature sensor readings to degrees
Celsius, kelvin or Fahrenheit. The unit (ºC, ºF or K) changes
automatically when you select the scaling.
If the sensor cables are so long that the resistance produc-
es a measurement error, you can specify an oset in ohms.
Select Cable resistance (Ohm) from the drop-down list
box. Enter the cable resistance you have measured. If you have not measured the cable resistance or
if you need to compensate for intrinsic heating or some other systematic error, you can specify an
oset in degrees. Select Temperature oset from the drop-down list box and specify the number of
degrees to deduct in order to arrive at the correct value.
The temperature inputs can also be used as digital inputs. In order to obtain the same function as
a standard digital input, the signal must be inverted�
Resistance measurement
The temperature inputs are actu-
ally measuring resistance. It may
be possible to connect other types
of resistive sensor. Go to section
2 to conrm that the resistance
range is compatible. The reference
manual explains how to congure
a channel to carry out the meas-
urement.
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