Campbell 21X Instrukcja Operatora Pobierz pdf (Strona 100)

SECTION 9.

INPUT/OUTPUT

INSTRUCTIONS

TABLE

9-3. Thermocouple

Type Codes

Code

X1

x2

X3

x4

Thermocouple

Tvpe

T

(copper

-

constantan)

E

(chromel

-

constantan)

K

(chromel-

alumel)

J

(iron -

constantan)

Normal

Measurement

TC

input from A5B40

isolation

(use

5

V range)

X

=

9 Output

-99999

if out of

common mode

(lnst.

14 only)

X=0

X=8

TABLE

9-4i

Voltage and

Temperature

Ranges

for

Thermocouples if

Reference Junction is 20oC

Voltdge

Range

Temperature Range

oC

Type

T

Type E

Type K

Type

J

t5

t15

t50

t500

ilnV

inV

dnV

-122

-270

-270

-270

141

386

1254

1372

-131

to

-270

to

-270

to

113

294

760

to

to

to

to

-70

to 98

-270

to

237

-270

to 676

-270

to

1000

131

316

400

-84

to

-210

to

-210

to

combined

differential

V

***

14

THERMOCOUPLE

TEMPERATURE,

***

DIFFERENTIAL

MEASUREMENT

FUNCTION

This instructbn

calculates the

thermocouple

temperature

[or

the thermocouple

type

selected.

ibn specifies

a DIFFERENTIAL

VOLTAGE

REMENT

(Section

13.2)

on

the

adds the

measured

voltage to

the voltage

lated for the

reference

temperaturelrelative

to

OoC,

and converts the

Input locations altered:

1 for each

thermocouple

channel

***

16 TEMPERATURE

FROM

***

PLATINUM

R.T.D.

FUNCTION

This

instruction

uses the

result of a

previous

RTD

bridge

measurement to

calculate the

temperature according to

the

DIN 43760

specification adjusted

(1980)

to

conform

to

the

pending

International

Electrotechnical

Commission standard.

The

polynomial

range

is

-200oC

to

850oC.

The

error

is less than

0.001oC

between

-100

and

+300oC, and is

less than 0.003oC

between

-180oC

and +830oC.

The error

(T

calculated

-

T

standard)

is +0.006oC at

-200oC

and

-0.006oC

at

+850oC. The input must be the

ratio

Rr/Rs,

where R. is the

RTD resistance and

Rs the

resistance of the

RTD at OoC

(Sections

7.9

and

7.10).

PARAM. DATA

NUMBER

TYPE DESCRIPTION

Repetitions

Input

location of Rs/Ro

Input

location of result

Multiplier

Otfset

to

temperature

in

oC.

The

are

briefly

shorted

to

ground

prior

to

the

voltage measurement to

insure

that

tltev

are

within

the common

mode

range. Tablf

9-3

gives

the

thermocouple

type

codes for

4. Select

the smallest

voltage

rangle that

will

accommodate

the

temperaturet

being

measured

(Table

9-4).

PARAM.

DATA

NUMBER

TYPE DESCRIPTION

Repetitions

Range

code

First

TC channel

Thermocouple

type code

Reference

temperature

location

Destination

input location

Multiplier

Otfset

01:

02:

03;

o4:

05:

06:

07:

08:

2

2

2

2

4

2

4

4

FP

FP

01:

02:

03:

04:

05:

4

FP

FP

Input locations

altered:

1 for each RTD

9-7

1 2 ... 95 96 97 98 99 100 101 102 103 104 105 ... 190 191

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