AM32 MULTIPLEXER
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Several enclosures may be purchased through
Campbell Scientific which offer a degree of
protection against dust, spraying water, oil,
falling dirt, or dripping noncorrosive liquids
(Models AM-ENC, AM-ENCT, ENC-24, ENC-
30). All the enclosures contain mounting plates
for the multiplexer and conduit bushings for
cable entry. These standard enclosures are
rain-tight, but not water-proof.
The AM32 is attached to the mounting plate
inside the enclosure with four screws.
The enclosure lids are gasketed. In high
humidity environments, putty (or a similar
substance) helps to reduce the passage of
moisture into the enclosure via the cable
conduits. The enclosure kit supplied with the
enclosure contains putty and desiccant.
CAUTION:
Air movement should not be
restricted into any enclosure containing
batteries that may produce explosive or
noxious gases (e.g. lead-acid cells).
U-bolts are provided to attach the enclosure to a
1.25" diameter pipe. The enclosure may also
be lag-bolted to a wall or similar flat surface.
9.1 ENVIRONMENTAL CONSTRAINTS
The AM32 operating temperature range is -
40
°
C. to +65
°
C. The multiplexer is susceptible
to corrosion at high relative humidity.
Desiccant packs are available and they should
be used inside the enclosure to remove water
vapor.
10.0 DIFFERENCES BETWEEN THE
AM32 AND THE AM416
The AM32 differs from the AM416 multiplexer in
the following ways:
1. The AM32 switches thirty-two channels of
two lines at a time (2 x 32). The AM416
switches sixteen sets of four lines at a time
(4 x 16).
2. The AM32 comes as a circuit board that
needs to be mounted in an enclosure. The
AM416 is packaged in an aluminum case
designed to decrease temperature
gradients across the multiplexer terminal
strips.
3. The AM32 requires one single-ended or
one differential input. The AM416 requires
two single-ended or two differential inputs.
4. The AM416 is more flexible in mix-and-
matching sensor applications. The AM416
can accept a larger variety of sensors.
Summary of Contents for AM32
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