AI830 RTD Input Module

Description

The AI830 RTD Input Module has 8 channels for temperature measurement with resistive elements (RTDs) using 3-wire connections. All RTDs must be isolated from ground. The module supports Pt100, Cu10, Ni100, Ni120, or resistive sensors. It performs linearization and conversion of temperature to Centigrade or Fahrenheit on the module. Each channel can be individually configured. The MainsFreq parameter sets the mains frequency filter cycle time, providing a notch filter at the specified frequency (50 Hz or 60 Hz).

Features

• 8 channels for RTD (Pt100, Cu10, Ni100, Ni120, and resistor) inputs.
• 3-wire connection to RTDs.
• 14-bit resolution.
• Inputs are monitored for open-circuit, short-circuit, and input grounded sensor.

Four different types of MTUs can be used:

• TU830 Extended MTU
• TU810 Compact MTU
• TU814 Compact MTU: Enables three-wire connection to devices without additional terminals.
• TU812 Compact MTU: Has a D-Sub 25 pin (male) connector for process connection.

Shielded field cables are required for process connections.

Technical Data

General Specifications at 25°C

• Number of channels: 8
• Type of input: 3-wire RTD: Pt100, Cu10, Ni100, Ni120, and resistive potentiometer
• Maximum field cable resistance:
  • 55 Ω for AI830 up to PR

• CMRR, 50 Hz, 60 Hz: >120 dB
• NMRR, 50 Hz, 60 Hz: >60 dB
• Error (IEC 51-1): See Table 21
• Resolution: See Table 21
• Temperature drift: See Table 21
• Update cycle time: 150 ms + $n \times 95$ ms (where $n$ is the number of active channels)
• Current consumption 24 V (Modulebus): 50 mA
• Current consumption 5 V (Modulebus): 70 mA
• Power dissipation: 1.6 W
• Supervision: Open-circuit, short-circuit, reference channel, internal power supply

Isolation

• Groupwise isolated from ground

Mounting Termination Units

• TU810
• TU812
• TU814
• TU830

MTU Keying Code

• AF

Rated Insulation Voltage

• 50 V

Dielectric Test Voltage

• 500 V a.c.