Yokogawa 701221 16-Channel Temperature/Voltage Input Module

The Yokogawa 701221 is a 16-channel input module for simultaneous acquisition of temperature and voltage signals in industrial automation, process control, and scientific research. Each of its 16 isolated channels operates independently, configurable as either a temperature sensor input or voltage measurement channel. The module delivers 16-bit resolution with automatic cold junction compensation for thermocouples and lead wire resistance compensation for RTDs, ensuring measurement integrity across diverse sensor types and environmental conditions.

Technical Specifications

• Input types: Thermocouple (J, K, T, E, R, S, B, N, W), RTD (Pt100, Pt1000, JPt100)


• Output units: °C, °F


• Thermocouple accuracy: ±(0.1% of reading + 1°C) for J, K, T, E; ±(0.2% of reading + 2°C) for R, S, B, N, W


• RTD accuracy: ±(0.1% of reading + 0.5°C)


• Resolution: 16-bit ADC


• Sampling rate: Configurable, up to 100 ms per channel


• Cold junction compensation: Automatic, built-in


• Lead wire resistance compensation: Automatic for RTDs Voltage Measurement


• Input ranges: ±10 mV, ±50 mV, ±100 mV, ±500 mV, ±1 V, ±5 V, ±10 V (configurable per channel)


• Input impedance: >1 MΩ (ranges up to ±1 V); >100 kΩ (±10 V range)


• Accuracy: ±(0.05% of reading + 50 µV) for ranges up to ±1 V; ±(0.1% of reading + 1 mV) for ±10 V range


• CMRR: >120 dB at 50/60 Hz


• NMRR: >60 dB at 50/60 Hz Physical & Operating


• Channels: 16 isolated


• Power consumption: 120 dB CMRR) minimizes AC interference


• Channel-to-channel and channel-to-ground isolation


• Low power draw supports battery-backed or embedded system deployment

Typical Applications Process monitoring, environmental data logging, equipment thermal profiling, multi-point sensor networks, industrial test stands, laboratory instrumentation racks.

Compatibility & Integration Communication protocol and power delivery depend on host system. Screw terminal field connections support standard instrumentation wiring practices.