SMART I/O User’s Manual
©1996 PEP Modular Computers GmbH
March 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 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
$61, read by the SPI Interface
Sensor Category Temperature
(Low Range)
Temperature
(High Range)
Sensor Category Temperature
(Low Range)
Temperature
(High Range)
R
-50
°
C
1760
°
C
T
-270
°
C
400
°
C
S
-50
°
C
1760
°
C
E
-270
°
C
1000
°
C
B
0
°
C
1820
°
C
K
-270
°
C
1370
°
C
J
-210
°
C
1200
°
C
