Campbell 21X Manual do Operador descarregar pdf (Página 156)

SECTION

14. INSTALLATION

AND MAINTENANCE

14.1

FROM

THE

ENVI

The normal

tal

variables of concern

are

and moisture.

The

standard

21X is designed

to

operate reliably

from

-25

to

+SOoC

(-55

to

+80oC, optional)

in

noncondenging

humidity.

When humidity

tolerances

4re

exceeded,

damage to

lC

chips,

microprocegsor

failure, and/or

measu rement

inaccuracie$ due

to condensation

on the

various PC

board

runners may result.

Etfective

humidity coftrol

is the

responsibility of the user.

The 21X

is rfot

hermetically sealed.

Two half

unit

packet!

of

DESI

PAK

desiccant

are

located

by the battefies.

This

desiccant

should,

in most

cases,

keel the

interior components

dry

between battery

changes.

A dry

package

weighs appfoximately

19

grams

and willabsorb

a maximum of

six

grams

of

water al40o/o

humidity anfl

11

grams

at 80%.

Desiccant

packets

caribe

dried out

by

placing

the

packets

in an oven

4t

120oC

for 16

hours

(desiccant

only,

not thE 21X).

Campbell Scientific offers

two enclosures

for

housing a21X and

peripherals.

The fiberglass

enclosures are classified

as NEMA

4X

(water-

tight, dusttight, corrosion-resistant,

indoor and

outdoor

use). A 1.25" diameter

entry/exit

pot't

is

located at the bottom of

the enclosure

for

routing

cables

and wires.

The

enclosure

door

can be fastened

with

the

hasp for easy access,

or

with the two supplied

screws

for more

permanent

applications,

The white

plastic

inserts at the corners of

the

enclosure must be

removed

to

insert the screws.

Both

enclosures

are white for reflecting solar

radiation, thus

reducing the internal enclosure

temperature.

The Model ENC 10/12

fiberglass

enclosure

houses the 21X and one

peripheral

such as a

Storage

Module. Inside

dimensions

of the ENC

1O112

are

12"x10"x4.5",

outside

dimensions are

16"x1

1.5"x7"

(with

brackets);

weight is

8.5

lbs.

The Model ENC 12l14 fiberglass

enclosure

houses

the

21X and one

or

more

peripherals.

lnside dimensions of the

ENC 12/14 are

14"x1 2"x5.5",

outside

dimensions

are

18"x13.5"x8.13"

(with

brackets);

weight is 11.16

lbs.

TABLE

14.2-1. Typical Current

Drain for Common

21X Peripherals

Typical Current

Drain

(mA)

Quiescent

Active

Peripheral

RC35 Cassette

PSO-VHF 5

Watt Radio

PSO-UHF

4 Watt Radio

RF95

RF Modem

SM1

9ZSM716

Storage Module

MD9

RAD

Modem and SC932

Interface

DC112

Phone

Modem

SDM-AO4

SDM.CD16

SDM-INT8

SDM-SW8A

0

't8

15

1.4

0.25

1.2

2.2

0.002

10.5

6.0

0.4

3

300

1350

1

100

30

3

80

10-15

45

11/LED lit

6.5

6

T

14-1

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