Campbell 21X Manuel de l'opérateur télécharger pdf (Page 66)

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Hi 6

EX1

7.5

107

TEMPERATURE

PROBE

lnstruction

11

is designed

to excite and measure

the CampbQll Scientific

107 Thermistor Probe

(or

the ther(ristor

portion

of lhe

207

temperature

and

relative

thumidity

probe)

and convert the

measurement into temperature

(oC).

In

this

example,

thf

temperatures

are

obtained from

three

107

p4obes.

The measurements are

made

on single-erlded channels

1-3, and the

temperaturqs are stored

in input

locations

1-3.

CONNECTIONS

The black

lqads

from the

probes go

to excitation

channel

1, tfre

white

leads

go

to

ground,

and

the

red leads

gq

to single-

ended

channels 1, 2, and

MEASUREMENT

PROGRAMMING EXAMPLES

3

(high

and

low sides of

differentialchannel

1

and

high

side

of 2).

P11

3

PROGRAM

Temp

107

Probe

Reps

lN Chan

Excite all reps w/EXchan

1

Loc

[:TEMP

#1

]

Mult

Offset

7.6 207 TEMPERATURE

AND RH

PROBE

Instruction 12 excites and

measures the

RH

portion

of the

Campbell Scientific 207

Temperature

and

Relative

Humidity Probe.

This

instruction relies on a

previously

measured

temperatu re

for

temperature

compensation

when

computing

RH. ln this

example,

three

probes

are

measured.

Instruction 11 is used

to

obtain the temperatures

of the three

probes

which

are

stored

in input

locations 1-3;

the

RH

values

are stored

in input

locations 4-6. The

temperature measurements are

made on single-

ended input channels

1-3,

just

as

in Example

7.5.

The

program

listed

below is a continuation

of the

program

given

in Example 7.5.

CONNECTIONS

The

black

leads

from the

probes

are connected

to excitation channel

1; the clear leads are

connected to

ground.

The

red

leads are

from

the

thermistor

circuit

and are

connected

to

single-

ended

channels

1-3.

The

white leads are

from

the

RH circuit and

are

connected

to single-

ended channels

4-6. The correct order

must be

maintained when connecting

the

red and

white

leads; i.e., the red lead

from

the first

probe

is

connected to single-ended

channel 1 and the

white

lead

from

that

probe

is

connected

to

single-ended channel 4, etc.

PROGRAM

RH 207

Probe

Reps

lN

Chan

Excite

all

reps

w/EXchan

1

Temperature Loc TEMP

#1

Loc

[:RH

#1

]

Mult

Offset

sEcTloN

7.

COPPER

CONSTANTAN

FIGURE

7.4f1. Thermocouples

with

External

Reference

Junction

The temper{ture of

the

107 Probe

is

stored

in

input locatiof 1 and the thermocouple

temperatureF in

Locations 2-6.

PROGRAM

01:

01:

02:

03:

04:

05:

06:

01:

01:

02:

03:

o4:-

05:

06:

02:

01:

02:

03:

04:

05:

06:

07:

08:

P1

1

P1

1l

1l

11

1

1l

;l

4

5

2

1

1

1l

4

1l

0

Temp 107

Probe

Rep

lN Chan

Excite

all

reps

w/EXchan 1

Loc

[:REF

TEMP

]

Mult

Offset

Thermocouple

Temp

(DIFF)

Reps

15 mV slow

Range

lN Chan

Type

T

(Copper-Constantan)

Ref

Temp Loc REF TEMP

Loc

[:TC

TEMP#1]

Mult

Offset

02: P12

01: 3

02: 4

03:

1

04: 1

05:

4

06: 1

07: 0

7-3

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