Chapter 1 module overview – Spectrum Controls 1794sc-IRT8I User Manual
Page 7
User's Manual Pub. 0300242‐01 Rev. A
Chapter 1
Module Overview
This chapter describes the 1794sc-IRT8I Isolated Universal input module and explains
how the module reads current, voltage, RTD, resistance and thermocouple/millivolt
analog input data. Included is information about:
• General description
• Input types and ranges
• Data Formats and filter frequencies
• Hardware Features
• System overview and module operation
• Auto-calibration
Section 1.1
General
Description
The isolated RTD/Thermocouple module supports current, voltage, RTD, resistance,
thermocouple and millivolt type inputs. The module digitally converts and stores analog
data from any combination mentioned above. Each input channel is individually
configured via software for a specific input device, data format, filter frequency, and
provides open-circuit, over-range, under-range detection and indication.
Section 1.2
Input Types
and Ranges
The tables below list the input types and their associated ranges.
Input Type
Range
B Type Thermocouple 300 to 1820 ˚C
(572 to 3308 ˚F)
C Type Thermocouple 0 to 2315 ˚C
(32 to 4199 ˚F)
E Type Thermocouple -270 to 1000 ˚C
(-454 to 1832 ˚F)
J Type Thermocouple -210 to 1200 ˚C
(-346 to 2192 ˚F)
K Type Thermocouple -270 to 1370 ˚C
(-454 to 2498 ˚F)
N Type Thermocouple -210 to 1300 ˚C
(-346 to 2372 ˚F)
R Type Thermocouple 0 to 1768 ˚C
(32 to 3214 ˚F)
S Type Thermocouple 0 to 1768 ˚C
(32 to 3214 ˚F)
T Type Thermocouple -270 to 400 ˚C
(-270 to 752 ˚F)
100 Ω Pt α 0.385
-200 to 850 ˚C
(-328 to 1562 ˚F)
200 Ω Pt α 0.385
-200 to 850 ˚C
(-328 to 1562 ˚F)
500 Ω Pt α 0.385
-200 to 850 ˚C
(-328 to 1562 ˚F)
1000 Ω Pt α 0.385
-200 to 850 ˚C
(-328 to 1562 ˚F)
100 Ω Pt α 0.3916
-200 to 630 ˚C
(-328 to 1166 ˚F)
200 Ω Pt α 0.3916
-200 to 630 ˚C
(-328 to 1166 ˚F)
500 Ω Pt α 0.3916
-200 to 630 ˚C
(-328 to 1166 ˚F)
1000 Ω Pt α 0.3916
-200 to 630 ˚C
(-328 to 1166 ˚F)
10 Ω Cu α 0.426
-100 to 260 ˚C
(-148 to 500 ˚F)
100 Ω Ni α 0.618
-100 to 260 ˚C
(-148 to 500 ˚F)