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Reading and changing the parameter values
The sensor has 2 switches. The left switch is the backlight switch and
the right switch is the display mode switch.
The two parameter values which are achieved after the calibration can
be read by selecting the appropriate LCD mode.
The following modes are present:
show temperature.
The temperature is shown in degrees Celsius.
show sensor id.
The sensor id is shown in 4 digits. This id is used for
identifying the sensor.
show blank LCD screen
. In this mode the PT100 reading (and power
consumption) is reduced to a minimum. The radio data transmission
remains active.
show parameter 1
. The leftmost digit shows ‘1’, the rightmost 3 digits
show the actual parameter value from -99 to +99.
show parameter 2
The leftmost digit shows ‘2’, the rightmost 3 digits
show the actual parameter value from -49 to +49.
The LCD mode can be selected by pushing the left button shortly. A
next LCD mode will be selected each time the button is pushed shortly.
In order to set the parameter value the following steps should be
performed:
Select the appropriate LCD mode: parameter 1 or 2.
Push the left button a long time until the ‘1’ or ‘2’ digit starts to blink.
Push shortly to increment the parameter value, push long for auto
increment.
When you have selected the correct value, leave the device
untouched. It will jump to the show temperature mode after a few
seconds. At that point the parameter data is stored into the on board
non-volatile memory.
Background information
The PRO-PT100 sensor determines the temperature by measuring the
electrical resistance of the PT100 element. The resistance
measurement is corrected linearly by the given gain and offset
parameters. Finally the resistance value is converted to temperature
using the DIN 60751 standard.
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