Chapter 4 Instrument Description
Mini-Switch LB 471
Co-60 has a relatively high energy of 1.17 or 1.33 MeV and is
used on very thick pipeline or container walls. Its half-life time
is 5.27 years.
In most cases, Cs-137 with an energy of 0.660 MeV is ade-
quate to irradiate common pipeline or container walls. Its half-
life time of Cs-137 is around 30 years.
Due to the lower energy, operating expenses for shielding a
Cs-137 source are lower than for Co-60.
4.2 Mini Switch LB 471 Versions
The Mini Switch LB 471 can either be delivered in a 19" rack, in a
wall housing or in a cassette.
Observe explosion protection!
Intrinsically safe and not intrinsically safe systems must not be
mixed, neither in a 19" rack nor in a wall housing.
The 19" rack can be mixed with limit switches for GM detectors
and fitted for NaI detectors. The 19" rack includes a back plane.
A filter module is used (for max. 19 limit switch modules) for
24V AC/DC supply. It includes:
one mains switch
on mains On LED
two fuses (see Technical Data on page 105)
additional filter section
A 85W transformer module is used (for max. 18 limit switch
modules) for 115/230V supply. In addition to the filter module, the
transformer module has:
a transformer with voltage selector switch 115V/230V
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