CNI-AL-Series

Supported Applications

The Omega CNI-AL Series is a temperature and process limit controller designed for measurement and alarm applications. The series accepts inputs from thermocouples, RTDs, analog voltage, or analog current signals to monitor process variables.

• Sensor Inputs: Supports 10 different thermocouple types (J, K, T, E, R, S, B, C, N, L) and 18 RTD combinations including 100/500/1000 Ω Pt sensors with 2-, 3- or 4-wire configurations.
• Process Inputs: Accepts analog voltage (0 to 100 mV, 0 to 1 V, 0 to 10 Vdc) and current inputs (0 to 20 mA).

The unit provides two relay alarm outputs for high/low or band control logic. Process inputs are fully scalable, supporting virtually all engineering units with a selectable decimal point.

Operating Conditions & Performance

The CNI-AL Series operates within an ambient temperature range of 0 to 55°C (32 to 131°F) at up to 90% RH non-condensing. Accuracy specifications are defined by input type:

• Temperature Accuracy: ±0.5°C
• Process Accuracy: 0.03% rdg (reading)
• Stability: Thermocouple @ 25°C (77°F) is 0.05°C/°C with cold junction compensation; RTD stability is 0.04°C/°C; Process stability is 50 ppm/°C.

The reading rate is specified at 3 samples/s. For current inputs, the series utilizes a 5 Ω shunt and provides an excitation voltage of 24 Vdc @ 25 mA (not available with low power option). Input impedance is 10 MΩ for 100 mV ranges and 1 MΩ for 1 or 10 Vdc ranges.

Enclosure Ratings

• ¼ DIN: NEMA 1/Type 1 front bezel
• ½, ⅛ DIN: NEMA 4X/Type 4 (IP65) front bezel

Configuration Options

The series is available in three standard DIN sizes with configurable power options and display configurations.

• DIN Sizes:
  • ¼ DIN: 48 H x 96 W x 127 mm D (1.89 x 3.78 x 5")
  • ⅛ DIN: 48 H x 48 W x 127 mm D (1.89 x 1.89 x 5")
  • ½ DIN: 25.4 H x 48 W x 127 mm D (1.0 x 1.89 x 5")
• Power Supply: Standard models accept 90 to 240 Vac ±10%, 50 to 400 Hz, or 110 to 300 Vdc. A low voltage power option supports 24 Vac or 12 to 36 Vdc (external source must meet safety agency approvals).
• Outputs: Two SPDT relay outputs rated at 250 Vac or 30 Vdc @ 3 A (resistive load).
• Display:
  • ¼ DIN: Single 4-digit 9-segment LED, 21 mm (0.83")
  • ⅛ and ½ DIN: Multi-color programmable display, 10.2 mm (0.40")
• Configuration: Front panel buttons allow selection of input type, alarm conditions, and display color.

The controller supports an external reset input and a buzzer audio annunciator. Electrical connections are made via front removable plug connectors.

Key Product Differences

Variants within the CNI-AL Series differ primarily by DIN size, power supply rating, and display dimensions:

• CNI8-AL / CNI16-AL / CNI32-AL: Standard models with 90 to 240 Vac or 110 to 300 Vdc power.
• CNI8-AL-DC / CNI16-AL-DC / CNI32-AL-DC: Low voltage options supporting 24 Vac or 12 to 36 Vdc inputs.

The series holds CE, UKCA, and UL US approvals. All models include a 1 YEAR WARRANTY.