Spectrum Controls 1794sc-IRT8I - Manual (Page 8)

1-2 Flex™ IO Isolated RTD/Thermocouple Module
User's Manual Pub. 0300242‐01 Rev. A
Input Type Range
120 Ω Ni α 0.672 -80 to 260 ˚C (-112 to 500 ˚F)
604 Ω NiFe α 0.518 -100 to 200 ˚C (-148 to 392 ˚F)
Resistance
0 to 150 Ω
0 to 1000 Ω
0 to 3000 Ω
Voltage
+/- 50 mV
+/- 100 mV
Section 1.3
Data Formats
For each module the data can be configured for:
• Engineering units x 1
• Engineering units x 10
• Scaled-for-PID
• Percent of full-scale
• Raw/proportional data
• CJC Engineering Units
• CJC scaled-for-PID
• CJC percent of full range
Section 1.4
Filter
Frequencies
The module uses a digital filter that provides high frequency noise rejection for each
input signal. The filter for each channel is programmable allowing you to select from six
different filter frequencies:
• 4.17 Hz
• 10 Hz
• 16.7 Hz
• 19.6 Hz
• 62 Hz
• 470 Hz
Section 1.5
Hardware
Features
Each module requires a terminal base unit. Terminal base units are connected together to
form the backplane for the system. Each base unit contains terminals for field
terminations. Field terminations are wired as differential inputs with the exception of
RTD and resistance type inputs. Two cold junction compensation (CJC) sensors can be
added to the terminal base unit to enable accurate readings when using thermocouple
input types. Each CJC sensor compensates for offset voltages introduced into the input
signal as a result of the cold-junction where the thermocouple wires come into contact
with the base unit. Module configuration is accomplished using the controller’s
programming software. In addition, some controllers support configuration via the user