New Displacement Transducer is range programmable.
A new addition to the Schreiber Messtechnik range
of inductive displacement sensors now available in
the UK , is the SM41/43 series for measurement from
20mm to 360mm full scale.
These sensors have built in electronics, which allows the unit to
be set up for any displacement range within its total measurement
range. So for example, a 100mm version can be programmed
with a 4-20mA output, which correlates exactly with any range
required to be measured - say from 20mm to 80mm. It does not
have to be the full 100mm range, as a non-programmable version
would be. Other standard outputs are available, and the sensors
can be supplied already set up to order, or can be configured by
Programming is accomplished by simply applying the supply
voltage to extra pins on the output connection. The internal
electronics take the analogue signal of the inductive sensor
and digitise this in a 16 bit A/D converter, followed by processing
in a micro-controller. The signal is linearised using the sensor's
eeprom stored variance of accuracy, and through a 16 bit D/A
converter is then transformed into a scaled analogue output signal.
The accuracy normally supplied is 0.25% but there is an option
of 0.1% accuracy, and the output can be configured to give an
increasing signal when the shaft is either pushed in or pulled out.