Yokogawa NFAI135-S50 Analog Input Module

Overview

The Yokogawa NFAI135-S50 is an 8-channel isolated analog input module. It works with STARDOM FCN/FCJ autonomous controllers. Each channel receives 4–20 mA signals from field transmitters. This makes it ideal for temperature, pressure, and flow measurements. Engineers benefit from its high noise immunity and reliable electrical isolation. Its fast response time and precise readings suit demanding industrial environments.

Technical Specifications

• Model: NFAI135-S50

• Input Type: Analog current input (4–20 mA)

• Number of Channels: 8 (individually isolated)

• Allowable Input Current: Up to 25 mA

• Input Resistance:

• Power ON: 250 Ω

• Power OFF: ≥500 kΩ

• Accuracy: ±0.1% of full scale

• Data Refresh Cycle: 10 ms

• Step Response Time: 100 ms

• Temperature Drift: Max. ±0.01%/°C

• Transmitter Power Supply:

• Voltage: 22.8 to 26.4 V DC

• Current Limit: 27 mA

• Withstand Voltage:

• Input to system: 500 V AC for 1 minute

• Channel to channel: 500 V AC for 1 minute

• Transmitter Wiring: 2-wire or 4-wire (set by channel pin)

• HART Communication: Supported

• Power Consumption:

• 5 V DC: Max. 360 mA

• 24 V DC: Max. 450 mA

• External Connections: Pressure clamp terminal or MIL connector

• Mounting: DIN rail or panel mount

• Operating Temperature: –20°C to +70°C

• Weight: 0.3 kg