Campbell Scientific CR10 CR10 Measurement and Control - Page 193

SECTION

14. INSTALLATION

AND MAINTENANCE

14.1

PROTECTION

FROM THE

ENVIRONMENT

The

normal environmental variables of concern

are

temperature

and

moisture. The

standard

CR10

is

designed

to operate

reliably

from

-25

to

+50'C

(-55'to

+85oC,

optional).

lnternal

moisture

is

eliminated

by sealing

the

module

at

the factory with

three

packets of silica gel (0.75

g

each)

inside.

The

desiccant

is replaced

whenever

the

CR10 is repaired at Campbell

Scientific. The

module

should

not be opened by

the

user except for

the

infrequent purpose of

PROM

replacement

(refer to Appendix G).

Repeated disassembly/assembly of

the

CR10

willdegrade the

seal, leading to potential

moisture

problems.

Extra desiccant should also

be placed

in

the enclosure

to

prevent corrosion

on the

Wiring Panelterminals

and

CRlOMiring

Panel connections.

Campbell Scientific

offers

two enclosures

for

housing

a

CR10 and

peripherals.

The fiberglass

enclosures are

classified as

NEMA 4X (water-

tight,

dust-tight,

corrosion-resistant,

indoor and

outdoor

use). A

1.25" diameter

entry/exit

port

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

enclosu re

temperatu

re.

The

Model ENC 12l14

fiberglass

enclosure

houses the

CR10,

power supply, and one

or

more

peripherals.

Inside

dimensions

of

the

ENC

12l14

are

14"

x

12"

x 5.5", outside

dimensions

are

18"

x

13.5'x

8.13"

(with

brackets);

weight

is

1

1.16

lbs.

The

Model ENC 16/18 fiberglass enclosure

houses the CR10 Power Supply, and several

peripherals.

lnside dimensions

of

the

ENC

16/18

are

16"

x

18" x 9",

outside

dimensions

are 21.75" x 20.0"

x

11.0" (with brackets);

weight

is 17.2

lbs.

14.2

POWER REQUIREMENTS

The

CR10 operates at

a nominal

12

VDC.

Below 9.6 or

above

16

volts

the

CR10

does

not

operate

properly.

The

CR10

is

diode protected against accidental

reversal

of

the

positive and ground leads from

the

battery.

Input

voltages

in excess

of

18

V

may damage

the

CR10 and/or power

supply.

A

transzorb

provides

transient

protection by

limiting voltage at approximately

20

V.

CAUTION:

The

metal sur{aces

of

the

Wiring

Panel

and

mounting bracket are at

the

same electrical ground as

the

power

supply.

Caution must be exercised when

connecting

power directly to the Wiring

Panel's

12

V

and ground terminals.

Connect the

plus

(+) side

of

the

supply first,

keeping

the minus

(-)

side away from

the

Wiring

Panel.

Once

the

plus side

is

secured, connect

the

power

return.

TABLE

14.2-1.

Typical Current

Drain

for

Common

CRl0

Peripherals

Typical Current

Drain (mA)

Quiescent

Active

Peripheral

RF100

VHF

5

Watt

Radio

RF200 UHF

4

Watt

Radio

RF95 RF Modem

SMI

92lSM71

6

Storage Module

CSMl

CR1

0KD

Keyboard/Display

DC1

12 Phone Modem

SDM-AO4

SDM-CD16

SDM-INT8

SDM.SWBA

1730

1

530

30

3

1B

0.3

C6

Mode)

45

11/LED

tit

6.5

6

30

30

1.4

0.25

0.5

<1

<1

10.5

6.0

o.4

3

14-1

Campbell Scientific CR10 CR10 Measurement and Control - Page 193

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