Thermo Scientific 61-12C, Operating And Service Manual

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Thermo Fisher Scientific REC 3449 Rev M 1-1
Chapter 1
Introduction
Overview
The Model 61-12 C (FM) Speed Sensor is designed and constructed for
direct connection to a conveyor tail pulley, snubbing roll, or large
diameter return roller.
The speed sensor employs a brushless pulse generator producing a stream
of pulses, each pulse representing a unit of belt travel. Frequency of the
pulse stream is proportional to true belt speed.
The Model 61-12 C (FM) is Factory Mutual (FM) approved for Class I,
Division II, Groups D and Class II, Divisions I and II, Groups E, F, G.
Figure 1-1. Model 61-12C Speed Sensor