Pepper-computer Modular Computers RS485 Bedienungsanleitung PDF herunterladen (Seite 185)

SMART I/O User’s Manual

Chapter 5 Analog Modules

5.2 SM-PT100

5.2.1 Introduction

The SM-PT100 is used for 2, 3 or 4-wire temperature measurement using

PT100 sensors driven by an on-board constant current source. Temperature

measurements between -200°C and + 850°C are possible with corrective

calibration for the two possible PT100 4-wire classes being provided in

driver software for OS-9 operation. A fast 16-bit delta-sigma A/D converter

ensures an absolute accuracy of 0.2°C.

5.2.2 Specifications

Isolation 1.0 kV Optoisolated from the system

Input

4 PT100 groups

4-wire connection supported

Open Sensor Detection

Self Calibration

Overvoltage Protection

Temperature Range

Temperature Drift

Conversion Time

Input Impedance

Resolution

Absolute Accuracy

Linearization

: ± 25V (power connected)

: ± 35V (power disconnected)

: -200°C to 850°C

: 1 LSB/°C (not compensated)

: typ. 125 ms, max. 500 ms

(depends on filter settings)

: 10 MΩ (min)

: 16-bit

: ± 0.2°C (sensor errors excluded)

: by software

EEPROM 256-bit serial EEPROM for Calibration Data

Front Panel 2 Red LEDs

Power Cons. 350mW (min.), 450mW (max.)

Temperature Range Standard (0°C to +70°C), Extended (-40°C to +85°C)

Module Weight 40g

ID Byte $60, read by the SPI Interface

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Pepper-computer Modular Computers RS485 Bedienungsanleitung Seite 185