Pepper-computer Modular Computers RS485 Bedienungsanleitung PDF herunterladen (Seite 188)

SMART I/O User’s Manual

March 12, 1996

Page 5 - 32

Chapter 5 Analog Modules

The two- and three-wire measurement methods shown in figure 5.2.5.2 are

not compensated and will experience errors due to line-resistances. The best

and recommended method is the 4-wire system shown in figure 5.2.5.1.

which eliminates all line resistances automatically. The sense lines, being

connected to a high impedance differential amplifier (10MΩ), introduce

almost zero error resulting from line-resistances.

Table 5.2.5.2 shows the deviation from the required temperature for both

class A and class B PT100 sensors.

Table 5.2.5.2 Tolerances between Class A and Class B Sensors

Temperature

°C

Tolerance

Class A Class B

°C

Ω

°C

Ω

-200 ± 0.55 ± 0.24 ± 1.3 ± 0.56

-100 ± 0.35 ± 0.14 ± 0.8 ± 0.32

0 ± 0.15 ± 0.06 ± 0.3 ± 0.12

100 ± 0.35 ± 0.13 ± 0.8 ± 0.30

200 ± 0.55 ± 0.20 ± 1.3 ± 0.48

300 ± 0.75 ± 0.27 ± 1.8 ± 0.64

400 ± 0.95 ± 0.33 ± 2.3 ± 0.79

500 ± 1.15 ± 0.38 ± 2.8 ± 0.93

600 ± 1.35 ± 0.43 ± 3.3 ± 1.06

650 ± 1.45 ± 0.46 ± 3.6 ± 1.13

700 – – ± 3.8 ± 1.17

800 – – ± 4.3 ± 1.28

850 – – ± 4.6 ± 1.34

Driver software running under OS-9 supplies linearization data for use with

DIN standa

d PT

00 senso

s. T

e on

boa

d EEPROM conta

ns boa

spec

ifi

c ca

on data

on pu

poses.

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