Technical Specifications:

Range Code 121 Reference (YS1310):

Functional Features:

• Silicon resonant sensor: Provides ±0.04% accuracy with excellent long-term stability (±0.04% per 10 years)
• Multi-protocol communication: HART 7, FF H1, Profibus PA, Modbus RTU — one transmitter fits any system
• Built-in temperature sensor: Measures process temperature for density compensation (in DP flow applications)
• Self-diagnostics: Continuous sensor health monitoring with alarm output on failure
• Zero and span trimming: Adjustable via HART communicator or front panel buttons
• Damping adjustable: 0.1 to 32 seconds to filter process noise
• Quick-mount design: 1/2 NPT connection with integrated 3-valve manifold mounting option
• SIL 2 capable: Suitable for safety-critical applications (SIS)

Working Principle:
The YS1310 uses a silicon resonant sensor consisting of a vibrating silicon diaphragm. The resonant frequency of the diaphragm changes with applied pressure. The sensor electronics measure this frequency shift using a phase-locked loop (PLL) circuit and convert it to a digital pressure value. The 4-20 mA output is generated by a high-precision DAC. HART 7 communication uses FSK modulation (1200/2200 Hz) superimposed on the 4-20 mA signal. For Foundation Fieldbus, the transmitter acts as an FF H1 device with standard AI (Analog Input) and PID function blocks.

Advantages and Highlights:

• ±0.04% accuracy — highest accuracy class in Yokogawa’s transmitter lineup
• Silicon resonant sensor — 10× more stable than capacitive sensors over time
• Multi-protocol (HART/FF/Profibus/Modbus) — universal compatibility with any DCS/PLC
• SIL 2 certified — suitable for safety instrumented functions
• IP67 / NEMA 4X — fully weatherproof for outdoor installation
• Wide turndown (100:1) — one transmitter covers a wide range of applications
• 316L stainless steel wetted parts — corrosion-resistant for harsh process fluids

Applicable Industries:

• Oil and Gas (DP flow measurement, tank level, pressure monitoring)
• Chemical and Petrochemical (reactor pressure, column DP)
• Power Generation (boiler drum level, condenser vacuum)
• Water and Wastewater (filter DP, flow measurement)
• Pharmaceutical (clean-in-place, sanitary applications)
• Food and Beverage (hygienic process monitoring)
• Pulp and Paper (stock flow, white water DP)

Installation Requirements:

• Install the transmitter at or below the pipe tap point for liquid service (to avoid gas pockets)
• Install the transmitter at or above the pipe tap point for gas service (to avoid liquid accumulation)
• Use impulse tubing filled with appropriate fill fluid (silicone oil standard)
• Install a 3-valve manifold between the process taps and the transmitter for isolation
• Connect power supply (12-45V DC) in series with the 4-20 mA loop
• For HART communication: Minimum loop resistance of 230Ω required
• For FF communication: Connect to FF H1 segment via FF interface module (e.g., Yokogawa AFV10D)
• Torque process connection to 35-40 N·m (1/2 NPT) using a torque wrench

Usage Precautions:

• Do not exceed maximum process pressure of 16 MPa (2320 psi) static or 40 MPa burst
• Do not apply pressure exceeding 1.5 × URL — risk of permanent sensor damage
• Verify diaphragm material compatibility with process fluid before installation (consult Yokogawa chemical compatibility chart)
• Perform zero calibration after installation and after any impulse line change
• For HART communication: Ensure loop resistance is 230Ω to 1100Ω
• Do not expose the transmitter to temperatures exceeding +120°C (or +200°C for high-temp version)
• Perform periodic verification every 1-5 years depending on SIL requirement and process criticality
• Do not use impulse tubing longer than 30 meters without a repeater — signal degradation will occur