Micromod MOD: MODCELL Multiloop Processor 2002N Model C and Bedienungsanleitung PDF herunterladen (Seite 44)

MODCELL Multiloop Processor

ELECTRICAL CONNECTIONS

S-3031-29

Figure 3- 7. Typical Input Circuit for 2009A RTD Input Module

S20

142

Ref

3-Wire

RTD

S19

A/D

BASE INSTRUMENTLOWER

TERMINAL

HOUSING

2009AZ__2__ RTD INPUT MODULE

(Module Location 19)

DATA

Processor

SEL

CLK

GND

+5V dc

Input

Isolation

+10V Iso

2009AZ__1__ RTD INPUT MODULE

(Module Locations 20 and 21)

DATA

Processor

SEL

CLK

GND

+5V dc

Input

Isolation

+10V Iso

A/D

S21

Comp

2-Wire

RTD

L/W

Compensation

NOTE: The lead wire resistance effect is about +0.001 Ohm/Ohm (ohms per lead).

Assuming 20 ohms per lead, the total error could be calculated as follows:

Error = ((0.001 Ohm/Ohm × 20 Ohm/lead) ÷ 400Ohm Module Span) × 100%

= 0.005%

The RTD sensor used for cold junction compensation is a platinum 1000 ohm RTD with an

alpha of 0.00385. The sensor is Class B (0.12%) and has an operating temperature range

of –50°C to +650°C (–58°F to +1202°F). It is connected to a 2 wire RTD input module

and installed in the housing.

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