Yokogawa NFAI841-S00/A4S00 Analog Input Module

Overview

The Yokogawa NFAI841-S00/A4S00 is an 8-channel analog input module designed for the CENTUM CS 3000 Distributed Control System (DCS). It accurately converts analog signals—such as temperature, pressure, and flow—into digital values for processing by the DCS. You can rely on this module in industries such as oil and gas, chemical processing, and manufacturing, where signal precision and system reliability are critical. Moreover, its robust isolation and fast response ensure stable operation in harsh industrial environments.

Technical Specifications

Input Specifications

• Channels: 8 analog input channels

• Input Signal Types:

• 4–20 mA DC

• 1–5 V DC

• Thermocouples and RTDs (depending on configuration)

• Resolution: 16-bit A/D conversion

• Input Impedance:

• 250 Ω (current input)

• 1 MΩ (voltage input)

• Input Accuracy: ±0.1% of full scale

• Input Resistance:

• Power ON: 250 Ω (4–20 mA), ≥1 MΩ (voltage)

• Power OFF: ≥500 kΩ (4–20 mA), ≥340 kΩ (voltage)

• Input Step Response Time: 100 ms

Output Specifications (for output models)

• Output Signal Type: 4–20 mA DC

• Resolution: 16-bit

• Accuracy: ±48 µA

• Allowable Load Resistance: 0 to 750 Ω

• Output Step Response Time: 40 ms

Environmental Specifications

• Operating Temperature: 0°C to +50°C (standard), –40°C to +85°C (extended models)

• Storage Temperature: –20°C to +70°C

Physical Characteristics

• Dimensions: Approx. 130 mm × 27 mm × 130 mm

• Weight:  0.3 kg

• Power Supply: Supplied via system backplane