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
Temperature Measurement
• 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.
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