Thermo Scientific 61-12C, Operating And Service Manual

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Thermo Fisher Scientific REC 3449 Rev M 2-1
Chapter 2
Installation
Overview
The Model 61-12 C Speed Sensor must be attached to a pulley shaft
which turns at true conveyor belt speed. Normally, the tail pulley shaft or
a snubbing roll shaft satisfies this requirement. In installations where the
tail pulley or snubbing roll shaft is not accessible, an additional pulley
must be installed specifically for the speed sensor
.
Coupling Installation
Two methods of coupling the speed sensor to the pulley shaft are shown
in Figure 2-1 and Figure 2-2. Other methods may work as well. The most
important requirement is that the speed sensor remains free floating and
not rigidly coupled to the conveyor frame.
Use the following procedures for coupling installation:
Method “A” Locate the exact center of tail pulley or snubbing roll shaft. Figure 5-1
may be cut out and used as a centering guide. (Refer to Figure 2-1)
1. Locate circle guide over tail pulley shaft and punch center. Drill a
1-3/4" deep hole using a 17/32" drill. (Drilling a smaller pilot hole is
helpful in assuring correct centering).
2. Tap this hole using a 5/8"-11 tap.
3. Clean out oil and dirt with an appropriate solvent and apply a thread
lock retaining compound, such as "LOCKTITE thread locker 262".
4. Thread in supplied stub shaft coupling (part# 037711) so that
coupling collar bottoms out against tail pulley or snubbing shaft. See
Figure 2-1.
5. Insert 61-12 C speed sensor into coupling. Be sure to align shaft flat
spot with set screws on coupling. Tighten all set screws securely.
Note. Never mount speed sensor on a driven pulley.
S