OPERATION / SENSOR CALIBRATION
Output Specification
The device outputs a pulse train which repeats every 4 seconds. This pulse train is generated by
varying the devices load resistance. Each pulse is 2.4ms in period and the output will range between
1 and 1650 of these pulses over the 4 second total period. A 200ms off period where no pulses are
generated is always maintained between the start of a new sequence and the end of the previous.
LED Behaviour
The LED’s give feedback as to the current output. The green LED is on when the output is pulsing and
is off when the output is low.
The blue LED indicates the device is functioning, flashing in a sequence 3 times every 4 seconds.
Device Configuration
The devices zero offset calibration can be set. This operation tells the device what the default level
of capacitance in a given application is. Ideally this should be carried out after the device has been
fitted however it can be carried out beforehand assuming that no additional sources of capacitance
are likely to be in front of the sensor within its intended area of use.
The calibration can be triggered by using the CalMag twin magnetic programmer supplied with the
device and holding it up against both the calibration points on the back. The blue and green LED’s
should come on and after holding the magnets for three seconds the lights will go off indicating a
calibration is complete.
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CalMag1
(Green LED)
CalMag2
(Blue LED)
Fig. B -
Calibration points positions
