YOKOGAWA PK200-A73/AM/FF1Current-to-pneumatic signal converter

YOKOGAWA (Hokura) PK200-A73/AM/FF1 Current-to-Pneumatic Signal Converter
I. Product Positioning
Current-to-Pneumatic Converter (Current-to-Pneumatic Signal Converter / I/P Converter)
Converts the 4-20mA standard current signal from the control system into a pneumatic pressure signal, which is used to drive pneumatic actuators such as pneumatic valves, cylinders, and diaphragm valves. Widely used in petroleum, chemical, power plants, and metallurgical process control systems.

 Model Segmentation Explanation (PK200-A73/AM/FF1) Table
Segmented coding Explanation
PK200 Product series: Yokogawa standard I/P electro-pneumatic converter complete unit series
A Input signal: 4~20mA DC standard direct current input
7 Output pressure: 3~15psi (20~100kPa) standard pneumatic signal, pressure gauge range 0~30psi
AM Auto/Manual automatic/manual switch knob (built-in manual operation switch on the front of the machine, can operate locally manually without electrical control)
FF1 Explosion-proof / Protective housing: NEMA 4 dust-proof and water-proof sealed housing, suitable for outdoor and humid working conditions

Core technical parameters
1. Signal specifications
Input: 4~20mA DC
Standard output: 20~100kPa (3~15 psi)
Supply air source pressure: standard 140kPa (20psi); double output model 240kPa
2. Accuracy performance
Basic accuracy: ±0.5% FS
Linearity: ±0.2% FS
Hysteresis: <0.2% FS
3. Air path energy consumption
Maximum air consumption: 4 Nl/min (140kPa supply air)
Maximum output air volume: 110 Nl/min, with strong load capacity
4. Interface thread
Air path interface (supply air, output pressure): 1/4″NPT internal thread
Electrical connection interface: 1/2″NPT internal thread
5. Environment and structure
Working temperature: -40℃ ~ +80℃ wide temperature application
Protection level: NEMA 4 (waterproof, dustproof, splash-proof)
Net weight: approximately 2.8kg
Control method: Electronic feedback closed-loop control, output pressure stable and anti-interference

Main functional features
Built-in automatic / manual (A/M) switch: Can switch to manual mode for maintenance and debugging, locally adjust output air pressure, no need to power on
Integrated dual pressure gauges on the machine body: Supply air pressure gauge + output pressure gauge, intuitive viewing of air pressure status
Zero point and range external adjustable: No need to disassemble to calibrate range and zero point
Low air consumption design, lower long-term operation air compressor energy consumption
Anti-vibration, resistant to high and low temperatures, suitable for harsh industrial site conditions

Typical application scenarios
DCS system (Yokogawa Centum VP/CS3000) matching drive pneumatic regulating valve
Petroleum, refining, power plant boiler feed water, air volume, pressure regulation loop
Hybrid instrument system (electrical control + pneumatic actuator mixed control system)