Campbell AM-ENC Analog Multiplexer Enclosure, AM-ENC Operator's Manual

AM-ENC ANALOG MULTIPLEXER ENCLOSURE

OPERATOR’S MANUAL

REVISION: 12/91

COPYRIGHT (c) 1989, 1991 CAMPBELL SCIENTIFIC, INC.

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WARRANTY AND ASSISTANCE

The

AM-ENC Analog Multiplexer Enclosure

is warranted by CAMPBELL SCIENTIFIC, INC. to be free
from defects in materials and workmanship under normal use and service for twelve (12) months from
date of shipment unless specified otherwise. Batteries have no warranty. CAMPBELL SCIENTIFIC,
INC.'s obligation under this warranty is limited to repairing or replacing (at CAMPBELL SCIENTIFIC,
INC.'s option) defective products. The customer shall assume all costs of removing, reinstalling, and
shipping defective products to CAMPBELL SCIENTIFIC, INC. CAMPBELL SCIENTIFIC, INC. will return
such products by surface carrier prepaid. This warranty shall not apply to any CAMPBELL SCIENTIFIC,
INC. products which have been subjected to modification, misuse, neglect, accidents of nature, or
shipping damage. This warranty is in lieu of all other warranties, expressed or implied, including
warranties of merchantability or fitness for a particular purpose. CAMPBELL SCIENTIFIC, INC. is not
liable for special, indirect, incidental, or consequential damages.

Products may not be returned without prior authorization. To obtain a Returned Materials Authorization
(RMA), contact CAMPBELL SCIENTIFIC, INC., phone [phone]. After an applications engineer
determines the nature of the problem, an RMA number will be issued. Please write this number clearly on
the outside of the shipping container. CAMPBELL SCIENTIFIC's shipping address is:

CAMPBELL SCIENTIFIC, INC.

RMA#_____
815 West 1800 North
Logan, Utah 84321-1784

CAMPBELL SCIENTIFIC, INC. does not accept collect calls.
Non-warranty products returned for repair should be accompanied by a purchase order to cover the repair.

815 W. 1800 N.
Logan, UT 84321-1784
USA
Phone [phone]
FAX [phone]
www.campbellsci.com

Campbell Scientific Canada Corp.
11564 -149th Street
Edmonton, Alberta T5M 1W7
CANADA
Phone [phone]
FAX [phone]

Campbell Scientific Ltd.
Campbell Park
80 Hathern Road
Shepshed, Loughborough
LE12 9GX, U.K.
Phone [phone]
FAX [phone]

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AM-ENC ANALOG MULTIPLEXER ENCLOSURE

1. DESCRIPTION

The AM-ENC (Analog Multiplexer ENClosure)
consists of a white fiberglass box, external
mounting brackets with U-bolts, conduit
attachments, and an internal plate for mounting
the multiplexer (Figure 1). These components
are shipped pre-assembled from Campbell
Scientific. If the AM-ENC is ordered with an
AM416 or AM32 Multiplexer, the multiplexer is
mounted in the AM-ENC at the factory. If the
AM-ENC and multiplexer are ordered
separately, some user assembly is required
(see Installation instructions).

The AM-ENC protects multiplexer from
windblown dust, rain, and sleet.

The AM-ENC is not recommended for use with
thermocouples. The recommended enclosure
for multiplexing thermocouples is the AM­ENCT. For further information on sensor
measurement or error analysis, please consult
your datalogger manual and the AM416
Multiplexer manual.

FIGURE 1. The AM-ENC Enclosure

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AM-ENC ANALOG MULTIPLEXER ENCLOSURE

2. SPECIFICATIONS

Dimensions:

External: 11.3" W x 13.5" L x 5.56" D
Internal: 10.0" W x 12.0" L x 5.25" D

Weight: approx. 10 lbs.
with AM416 installed: approx. 12 lbs.
with AM32 installed: approx. 12 lbs.
shipping: approx. 16 lbs.

NEMA Rating: Prior to modification-­3,3R,3S,4,4X,6,6P,12,13

Lid attachment: Hinged; sealed with poured­in-place internal gasket. Un-hinged side
secured with two captive screws.

Conduit diameter:

with reducing plug: 0.5"
without reducing plug: 1.25"

3. INSTALLATION

If the multiplexer was not installed at the factory,
the enclosure will contain a small plastic bag
with the following parts:

3. Remove and dispose of the four rubber feet
from the back panel of the AM416.

4. Align the two holes through the back panel
of the multiplexer with the holes on the
mounting plate. Attach the back plate of the
AM416 to the mounting plate with two 3/8"
screws from the enclosed plastic bag.

5. Reassemble the multiplexer.

3.2 AM32

The AM32 requires four 3/8" screws, four
spacers, and four washers to attach it to the
internal mounting plate.

Tools required: flat-bladed screwdriver

1. Install the four 3/8" spacers in enclosure
base mounting plate.

2. Attach the AM32 to the base mounting plate
with the four 3/8" screws and washers.

3.3 MOUNTING ENCLOSURE TO EXTERNAL WALL OR PIPE

(4) 3/8" screws
(4) #6 washers
(4) 3/8" spacers

3.1 AM416

The AM416 requires two 3/8" screws to attach it
to the mounting plate. The additional enclosed
hardware is not required for AM416 installation.

Tools required: #1 Phillips screwdriver, flat­bladed screwdriver

1. Remove the four Phillips screws at the
corners of the AM416 and remove the cover
plate. Care must be taken when removing
the upper plate of the multiplexer. It is
generally easiest to lift the edge opposite
the strain relief flange up first, then slide the
plate out. Make sure to clear the terminal
strips.

2. Remove the two screws at the center of the
printed circuit board and then remove the
printed circuit board. Place the board on a
clean, dry surface.

Two 1.25" x 5/16" U-bolts (provided) attach the
enclosure to a 1.25" schedule 40 pipe. The U­bolts and brackets can be removed to mount
the enclosure against a flat surface. Four user­supplied 5/16" diameter screws or bolts can be
used for this purpose. The type and length of
the screws or bolts depends on the composition
of the supporting surface. To prevent damage
to the fiberglass enclosure, use the washers
from the U-bolt bracket and do not over-tighten
the mounting screws (bolts).

4. CABLE ROUTING AND DESICCANT USE

All sensor and datalogger connection cables
should be routed through the conduits on the
lower surface of the enclosure (Figure 1). Each
conduit port includes a two-piece bushing set
and a slip-in reducing plug which seats inside
the external female bushing. The internal
diameter of the bushings is 1.25 inches and the
internal diameter of the reducing plugs is 0.5
inches. Sensor, datalogger, and battery cables
that enter the AM-ENC should be attached to a
strain-relief device. The AM416 has a flange to
tie wires to for strain relief.

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AM-ENC ANALOG MULTIPLEXER ENCLOSURE

The slip-in reducing plug has a smaller external
orifice that restricts air movement. The
reducing plugs may be removed to
accommodate large diameter cables.

Desiccant should be used inside the AM-ENC to
help reduce water vapor. Desiccant should be
regularly replaced when necessary. Desiccant
life is prolonged by plugging the cable entry port
with electrician's putty, or foam.

NOTE: Because lead-acid batteries may
emit explosive hydrogen gas, DO NOT seal
an enclosure containing lead-acid batteries.

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