Length (Lineal) Counter; Standard Edge Detectors - Hunter SpectraProbe XE Hardware User Manual

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Length (Lineal) Counter

The length counter consists of a precision wheel with a rubber tire which rests on the product (or on a
roll which revolves with a circumferential velocity equal to the speed of the product), which is
connected to an impulse generator that transmits an impulse to the support unit for every one-sixth of an
inch (4 mm) traveled. This information may be used to provide length information, which may appear
in either yards or meters on the screen of the system computer when length-based trend plots are
selected.
The length counter interfaces directly to the SPPC card on the PC104 bus of the support unit. The
presence of a length counter is automatically detected at power-up or instrument reset.

Standard Edge Detectors

Standard edge detectors detect the presence of the measured surface relative to the measurement port.
Infrared sensors mounted on the front of the sensor in two configurations detect when the leading edge
of the sample moves under the sensor and then when the sample moves away from the sensor. The
sensitivity of the detectors is adjustable using a small pot on the side of the housing. Adjust this pot so
that the indicator light on the sensor goes on only in the presence of product.
1-16
Introduction
11/02
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