SMART I/O User’s Manual
©1996 PEP Modular Computers GmbHMarch 12, 1996 Page 5 - 29
5
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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