Brief Product Description

Emerson 1C31194G01 and 1C31194G02 are Ovation (former Westinghouse) valve positioner electronic modules for Ovation DCS distributed control system. Both are electro-pneumatic / electro-hydraulic valve closed-loop control cards, receiving 4-20mA setpoint command from Ovation controller, collecting valve LVDT position feedback signal to realize precise stroke positioning for regulating valves. The main difference lies in LVDT excitation parameters: 1C31194G01 outputs 17V AC peak-to-peak @1kHz; 1C31194G02 outputs 23.75V AC peak-to-peak @3kHz. They need to match corresponding LVDT position sensors and personality modules. Built-in self-diagnosis detects feedback loss and circuit fault. Suitable for long-term continuous operation in power plant and process industry. Fully tested surplus and refurbished Emerson 1C31194G01 / 1C31194G02 modules are available for legacy Ovation DCS maintenance, valve positioner card replacement and plant control system retrofit projects.

Core Product Functions

• Closed-loop positioning control for pneumatic or electro-hydraulic regulating valves in Ovation DCS
• Receive 4-20mA setpoint command from DCS controller, collect LVDT valve position feedback
• Convert DCS electronic signal to servo/pneumatic driving output for valve actuator
• 1C31194G01: LVDT excitation 17Vpp,1kHz;1C31194G02:23.75Vpp,3kHz
• High positioning accuracy, continuously adjust flow, pressure and liquid level control loops
• Built-in fault diagnosis for LVDT open/short circuit, feedback loss and module abnormality
• Cooperate with personality module to adapt different servo valve coil impedance
• Single-slot plug-in design for Ovation I/O chassis backplane

• LED indicators for power, run status and fault alarm for field inspection

Application Scenarios

• Legacy Emerson Ovation DCS valve regulating control loop
• Thermal power plant boiler feedwater, steam temperature, flue gas damper and turbine valve control
• Petrochemical, refinery continuous process pressure, flow and liquid level automatic regulation
• Oil & gas, pulp & paper large process regulating valve closed-loop control
• Metallurgy, chemical batch process precise valve stroke control
• Legacy Ovation valve positioner module replacement, maintenance and plant retrofits

FAQ (Frequently Asked Questions)

• Q: Valve position drifting or jitter after replacing 1C31194G01/G02?
  A: Confirm module model matches LVDT sensor, check LVDT wiring and shielding, calibrate valve stroke, inspect servo/pneumatic circuit leakage, verify backplane contact and grounding anti-interference.
• Q: Does Emerson 1C31194G01 / 1C31194G02 support hot-swap replacement?
  A: Hot swap is not recommended. Bypass control loop, back up parameters and perform lockout-tagout before replacement to avoid process fluctuation.
• Q: What is the core difference between G01 and G02?
  A: Different LVDT excitation voltage and frequency. G01:17Vpp 1kHz; G02:23.75Vpp 3kHz. Must match the original LVDT transducer, cannot be mixed use directly.
• Q: What accessory needs to be used together?
  A: It needs to be equipped with personality module for different servo valve coil matching.
• Q: Are 1C31194G01 and 1C31194G02 available for new control projects?
  A: These legacy Ovation valve positioner modules are end-of-life for new installations. Only fully tested surplus and refurbished units are supplied for existing DCS system maintenance and retrofits.