Kaman KD-5100 - Manual (Page 14)

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Figure 8 20N Sensor Dimensions
7-5b. The target must not strike the sensor face. This system has a null gap of 15 mils
(0.015”/0.381mm) for the 15N sensor and 20 mils (0.020”/0.508mm) for the 20N sensor.
The specified full measuring range for both sensors is ±0.009” (±0.228mm). The
difference between the null gap and measuring range (6 mils for the 15N and 11 mils for
the 20N) is the offset distance for the sensors. This offset is necessary both to optimize
performance and to keep the target from contacting and possibly damaging the coils in
the sensor face.
7-5c. The sensor coil is mounted at the face of both sensors. For purposes of mechanical
nulling, measure distance from the sensor face. (For electrical nulling, the most accurate
method, the null gap is referenced to the electrical centerline, which is one half of the coil
depth – ½D, Figure 9.)