Emerson 1C31224G01 Product Description (Ovation 8-channel 4-20mA Analog Input Module)

1C31224G01 is an 8-channel high-precision analog input (AI) module of Emerson (formerly Westinghouse)'s Ovation DCS system. It is specifically designed to collect 4-20mA current signals from on-site transmitters, convert them into digital quantities, and send them to the controller for monitoring of continuous process variables such as pressure, flow, level, and temperature. It is widely used in key process industries such as thermal power, oil and gas, chemical, and metallurgy. 

I. Basic Information

Model: 1C31224G01

Brand: Emerson (formerly Westinghouse)

Series: Ovation DCS 1C Series I/O

Type: 8-channel Analog Input Module (AI)

Input Signal: 4–20mA DC (compatible with two-wire/four-wire transmitters)

Resolution: 14-bit A/D

Channels: 8 independent differential inputs

Installation: Ovation standard I/O rack (compatible with 1C series base)

Power Supply: Backplane 5V/24V DC (system power supply)

Weight: Approximately 0.45–0.56kg

Origin: USA

Warranty: 12 months (original factory)

II. Core Functions and Features

1) 8-channel high-precision 4-20mA acquisition

8 channels fully isolated differential inputs, strong anti-common-mode interference.

Resolution 14 bits, full-scale range accuracy ±0.1%, suitable for precise process monitoring.

Input impedance 250Ω, standard 4-20mA loop matching.

Support for open-circuit detection: below 3.8mA is judged as open circuit, the module automatically alarms.

2) Electrical isolation and protection

Channel ↔ System: Photoelectric isolation 1500V AC, protects the DCS side safety.

Each channel has surge/ESD/reverse connection protection, can withstand industrial site transient high voltage.

Channel isolation to avoid mutual interference.

3) Self-diagnosis and status indication

Module level: Running, fault, communication status LED.

Channel level: Over-range, open-circuit, short-circuit diagnosis, can be sent to Ovation system.

Support hot swapping: Online replacement does not affect the operation of other modules in the rack.

4) Industrial environmental adaptability

Operating temperature: -40℃ ~ +70℃

Relative humidity: 5%–95% RH (no condensation)

Anti-vibration / shock: Complies with IEC 60068

Pollution grade: ISA-S71.04 Class G3 (power plant / chemical industry harsh environment)

III. Key Technical Specifications

Channel Number: 8 (isolated)

Input Signal: 4–20mA DC

Resolution: 14 bit

Accuracy: ±0.1% FS

Isolation Voltage: 1500V AC (channel - system)

Input Impedance: 250Ω

Update Cycle: 250ms

Diagnosis: Open-circuit, over-range, module fault

Size (approx.): 121 × 52 × 166 mm

Weight: 0.45–0.56kg

IV. Typical Applications

Power generation (thermal power / gas power / nuclear power)

Boiler: Steam drum level, steam pressure / temperature, flue gas pressure / oxygen content, feedwater flow

Steam turbine: Shaft seal pressure, lubricating oil temperature / pressure, condenser vacuum, exhaust steam temperature

Auxiliary equipment: Coal mill outlet temperature, primary / secondary air flow, dust collector differential pressure

Petroleum and natural gas

Wellhead: Oil pressure / casing pressure, temperature, flow

Purification device: Separator liquid level, pressure, temperature; compressor inlet / outlet parameters

Long-distance pipeline: Pressure, flow, temperature, leakage detection signal

Chemical / metallurgy / water treatment

Reactor: Temperature, pressure, level, pH (via transducer)

Distillation tower: Tower pressure, top / bottom temperature, reflux flow

Water treatment: pH, conductivity, dissolved oxygen, level, flow

V. Accessories and Selection Tips

Matching rack / base: 1C31205G01 (2 slots), 1C31206G01 (4 slots)

Similar comparison:

1C31224G01: 8 channels, 4-20mA, 14 bits, isolated, most commonly used 1C31225G01: Voltage / Thermocouple / RTD Multi-type AI

1C31219G01/G04: Relay Output Driver Module (配套 DO Base)