Spectrum-controls 1794sc-IRT8I Instrukcja Użytkownika Pobierz pdf (Strona 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

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