Pepper Computer Modular Computers RS232 User Manual

SMART I/O User’s Manual

©1996 PEP Modular Computers GmbH

March 12, 1996

Page 5 - 29

Chapter 5  Analog Modules

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.

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 M

Ω

 (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