7.3 (SC) Scaling Factor / Green LED
Each Temposonics position sensor has its own specific scale factor (gradient) which
describes the velocity of the torsional strain pulse through the waveguide medium
(refer to 'Principle of Operation'). The gradient is indicated on the sensor's label. Upon
initial start-up or when replacing sensors, this value must be set to recalibrate system.
1) Momentarily tap the programming switch to Position #1, the 'SC' LED will light.
ADJUST 2) Hold the programming switch in Position #2 until the 'SC' LED begins to flash (≈ 3 sec.)
3) Enter the scale factor indicated on the sensor label using the BCD switches (S1 - S6).
Example: Gradient = 8.94371
BCD Switch # Settings
S1 1
S2 7
S3 3
S4 4
S5 9
S6 8
SC
IMPORTANT
Scale Factor or Gradient
For stroke lengths defined in inches (Pin c14 set for inches), the
scale factor or gradient is described in microseconds per inch.
This value is indicated on the sensor's label (see Fig. 7.3).
For stroke lengths defined in millimeters (Pin c14 set for millime-
ters), the scale factor or gradient is described in meters per sec-
ond.
The formula to convert µs/in, to m/s is as follows:
(Scale in m/s) = 25,400 ÷ (Scale in µs.in.)
Example:
Scale (Gradient) = 8.94371 µs/in.
25,400 ÷ 8.94371 µs/in = 2839.98 meters/second
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