Checkline KXB - Manual (Page 3)

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1.0 OVERVIEW & OPERATING PRINCIPLE
DX2 and DXX Tension Meters are hand-held, mechani-
cal instruments which accurately measure the running
as well as static tensions of a wide variety of process
materials including yarns, fibers, wires, optical fibers,
tapes, etc. They employ the 3-roller principle for ten-
sion measurement where the outer two reference guide
rollers remain fixed during measurement to establish a
wrap angle over the middle sensing roller. The middle
roller, acting against an internal calibrating spring, is
displaced relative to the running line tension. This
displacement is converted to a rotary motion to turn a
pointer on a scale to give a reading in grams tension.
NOTES: 1) While illustrations show the Type DX2
Tension Meter, all references also
apply to the Type DXX and Special-
Purpose Tension Meters as well.
2) DX2 Special Purpose Types, including
FX2, TX2, DX2F, RX2/BX2 and KXB,
are shown in the Appendix at the end
of these instructions. They all use the
3-roller principle for tension measure-
ment except that head configurations
and roller assemblies are different,
having been designed for special
applications, as noted in the
Appendix.
6.3 Air Dashpot Damping
DX2 and DXX Tension Meters incorporate a moderate
amount of movement damping to smooth out some
high frequency tension fluctuation. However, where
process fluctuations result in rapid pointer swings
which make it difficult or near impossible to read the
scale, an optionally-available Air Dashpot Damping
mechanism can be provided to slow down the pointer
swings to permit a reading.
In setting up the mechanism,
it is best to set the damping
rate just to the point where
a readable pointer results
with minimal pointer swings.
The amount of damping is
set by turning the small
slotted screw or hex-head screw of the damping
assembly located near the guide-roller mounting
bracket. The Air Dashpot must be installed at time
of original manufacture. It cannot be added later.
CAUTION: Do not set damping rate too high as
this will damage the movement.
6.4 Memory Pointer
The optional Memory Pointer
assembly retains the highest reading
obtained during a measuring period.
Before using the instrument, rotate
the knurled pointer knob clockwise
until the “memory” pointer tab
contacts the measuring pointer at
zero. During operation and after
instrument removal, the trailing
“memory” pointer will hold the maximum reading until
reset with the pointer knob.