Owner's manual

9
9.0 BATTERY INSTALLATION & REPLACEMENT
The BTM gauge is shipped with a 9-volt DC alkaline battery. To install it, or replace it
when the display shows LOW BAT, proceed, as follows:
1. Turn the gauge over. Using your forefinger press down on the battery
compartment latch, located just above the belt clip. Pull the battery
compartment cover towards you and off.
2. Install the new battery being sure that the terminals are completely attached.
3. Replace the cover by inserting the two plastic tabs into the slots at the base
of the compartment and press forward until the latch clicks shut.
4
4.0 PRELIMINARY COMPUTATIONS
Before beginning the measurement process, the following parameters must be
determined. As previously noted, the Belt Density (d) and Length of Free Belt Span
(L) are fixed for any particular installation. The belt and pulley manufacturer or sup-
plier can usually supply those parameters. Refer to chart in 10.0, for typical densities.
If this information is not readily available, proceed to determine them, as follows:
4.1 Belt Density (d = kg/m or lb/ft)
1. Weigh the entire belt to determine kg or lb.
2. Measure the developed length of the entire belt, in meters or feet.
3. Calculate d = kg/m or lb/ft.
4.2 Length of Free Belt Span (L)
1. Referring to the fig. 2, measure L, the belt segment that will
be vibrated. It is equal to the belt length between tangential points
where the belt contacts opposite pulley wheels or sheaves.
OR
2. Calculate L, using the following formula:
L =
√C
2
– [(D1 – D2)/2]
2
where
L = Free Span length (m or feet)
C = Center-to-center (c:c) distance between pulley centers.
D1 = Pitch diameter of larger pulley, P1
D2 = Pitch diameter of smaller pulley, P2.
All dimensions are in meters (m) or feet (ft).
P1
P2
C
L
Figure 3. Measuring Free Belt Span (L)
Latch
Cover
Belt Clip
9-volt Battery
Plastic tabs