YOKOGAWA PK200-A73/AM/FF1 Current-to-Pneumatic Converter

The YOKOGAWA PK200-A73/AM/FF1 is a precision current-to-pneumatic (I/P) converter equipped with Auto/Manual transfer function. It converts 4-20mA DC electronic control signals into proportional pneumatic pressure output, acting as a signal bridge between DCS control systems and pneumatic valve actuators in hybrid instrument environments.

This unit adopts electronic feedback control design, featuring high linearity and low air consumption. It integrates built-in pressure gauges and supports local manual operation mode. Widely used for process control cabinet renovation, field instrument maintenance and spare parts stocking in petrochemical, power and oil & gas industries.

Main Specifications

• Brand: YOKOGAWA (Yokogawa Electric)
• Model: PK200-A73/AM/FF1 Current-to-Pneumatic Converter
• Input Signal: 4~20mA DC analog current
• Output Pneumatic Range: 20~100 kPa
• Accuracy: ±0.5% of span, Linearity: ±0.2% of span
• Air Consumption: 4 NL/min; Output air capacity:110 NL/min
• Configuration: With Auto/Manual (AM) transfer switch
• Housing: Die-cast aluminum, epoxy coating protection
• Operating Temperature: -40°C ~ +80°C
• Mounting: Field bracket mounting for industrial site installation

Core Functions

• Realize proportional conversion between 4-20mA electric signal and pneumatic pressure signal
• Auto/Manual switch enables local on-site manual operation without control system signal
• Electronic feedback control ensures stable output pressure and high conversion precision
• Built-in pressure gauges for real-time visual monitoring of input and output pressure
• Support zero and span adjustment on site for convenient calibration work
• Low air consumption design reduces long-term operation cost of instrument air system
• Strong anti-interference performance suitable for complex industrial field environments
• Drive diaphragm control valves, pneumatic actuators and other terminal execution equipment
• Compatible with Yokogawa DCS and other mainstream distributed control systems
• Continuous stable operation for long-cycle industrial process production occasions

Application Scenarios

• Petrochemical plant pipeline flow and pressure regulation valve control occasions
• Thermal power plant boiler auxiliary system pneumatic actuator control cabinets
• Oil & gas processing plant safety shutdown valve and regulating valve drive systems
• Pulp and paper factory distributed process control instrument network
• Waste heat power generation unit medium and low pressure control loop systems
• Water treatment plant chemical dosing and flow pneumatic control loops
• Refinery reactor temperature, pressure continuous regulation control platforms
• Offshore platform process instrument hybrid electric-pneumatic control system
• YOKOGAWA DCS system field instrument upgrading and spare parts replacement
• All industrial sites requiring signal conversion between electronic controllers and pneumatic valves