The Yokogawa 701261 is a two-channel universal input module for simultaneous voltage and temperature measurement. It acquires DC voltage, AC voltage, and thermocouple signals across 12 thermocouple types (K, E, J, T, L, U, N, R, S, B, W, iron-doped gold/chromel) plus RTD inputs. The module delivers 16-bit resolution on voltage channels with ±0.25% accuracy and 0.1°C temperature resolution, making it suitable for precision industrial process monitoring, environmental characterization, and laboratory research.
Technical Specifications
Measurement Channels & Resolution
• 2 channels, isolated unbalanced inputs with binding post connectors
• Voltage: 16-bit A/D conversion (24,000 LSB/range), ±(0.25% of range) accuracy
• Temperature: 0.1°C resolution with high-accuracy thermocouple and RTD support
• Input impedance: approximately 1 MΩ
Sampling & Response
• Voltage: 100 kS/s maximum sample rate; DC response to 40 kHz
• Temperature: 500 Hz data update rate; DC response to 100 Hz
• Temperature coefficient: zero point ±(0.01% of range)/°C, gain ±(0.02% of range)/°C (typical)
Input Ranges & Coupling
• Voltage input range: 50 mV to 200 V in decade steps (1, 2, or 5)
• Effective measurement range: 2× the setting range with 1/2 setting range DC offset
• Input coupling: TC (thermocouple), DC, AC, or GND selectable
Filtering
• Voltage: OFF, AUTO (anti-aliasing filter), 4 kHz, 400 Hz, or 40 Hz (-12 dB/octave)
• Temperature: OFF, 30 Hz, 8 Hz, or 2 Hz
– Key Features
• Dual-function input module eliminates need for separate voltage and temperature acquisition cards
• Thermocouple support includes rare-earth alloy types (W, iron-doped gold/chromel) for extreme-temperature applications
• Selectable input filtering addresses both high-frequency noise rejection and signal fidelity
• Isolated inputs prevent ground loop corruption in multi-channel industrial systems
– Typical Applications
• Process thermal monitoring and control validation
• Environmental chamber characterization
• Materials testing with simultaneous voltage and temperature logging
• Multi-point temperature mapping in research facilities
– Compatibility & Integration
Installs in Yokogawa DL750, DL750P, SL1400, SL1000, DL350, DL850 series, DL850EV, and DL950 mainframes.
