PEP Modular Computers Modular Computers RS485 - Sm-Therm; Introduction; Specifications

SMART I/O User’s Manual
©1996 PEP Modular Computers GmbHMarch 12, 1996 Page 5 - 59
5
Chapter 5 Analog Modules
5.3 SM-THERM
5.3.1 Introduction
The SM-THERM supports up to four groups of thermoelement sensors
together with a cold junction (ext. PT100) for accurate temperature measure-
ment. The sensor types shown in the table below may be connected with
corrective calibration for all sensor classes being provided by driver software
running under OS-9. A fast 16-bit delta-sigma A/D converter ensures an
absolute accuracy of 0.2°C.
5.3.2 Specifications
Isolation 1.0 kV Optoisolated from the system
Input
4 Thermocouple groups
1 PT100 for Cold Junction (2-wire)
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)
: Refer to table below
: 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 $61, read by the SPI Interface
Sensor Category
Temperatur
e
(Low Range)
Temperatur
e
(High Range
)
Sensor Category
Temperatur
e
(Low Range)
Temperatur
e
(High Range
)
R -50°C 1760°C T -270°C 400°C
S -50°C 1760°C E -270°C 1000°C
B0°C 1820°C K -270°C 1370°C
J -210°C 1200°C