BY Controls EPCON Electro-Pneumatic Controller (0~30 kgf/cm²)

BY Controls EPCON Electro-Pneumatic Controller (Sensor Range: 0~30 kgf/cm²)

The BY Controls EPCON Electro-Pneumatic Controller (0~30 kgf/cm² sensor range) is a PID process controller engineered specifically for harsh marine engine room and industrial process environments. Designed by Bumyang Controls Co., Ltd., this unit bridges electronic sensing and pneumatic actuation by receiving a continuous process variable (PV) signal from a 0~30 kgf/cm² pressure transmitter (or PT100/thermocouple input depending on sub-variant) and outputting a modulated 0.2~1.0 kgf/cm² (3~15 psi) pneumatic control signal via an integrated Current-to-Pneumatic (I/P) converter module.

The EPCON controller maintains tight deadband tolerances on critical shipboard auxiliary systems—including main engine jacket cooling water, lube oil pressure regulation, fuel oil viscosity/pressure loops, and auxiliary boiler steam pressure control.

Model Details

• Manufacturer: BY Controls (Bumyang Controls Co., Ltd., South Korea)
• Series: EPCON Series (Electro-Pneumatic Process Controller)
• Manufacturer Part Number (MPN): EPCON-P30-0210 (Standard 0~30 kgf/cm² Pressure Input / 0.2~1.0 kgf/cm² Pneumatic Output configuration)
• Control Action: Direct / Reverse Action selectable via internal DIP switches or front-panel keypad configuration
• Display Type: Dual 4-digit LED display (Red PV / Green SV) with bar-graph output indicator

Features

1. Integrated Electro-Pneumatic Conversion: Combines a microprocessor-based PID controller and a high-capacity I/P transducer in a single IP65-rated die-cast aluminum housing, eliminating external I/P converters and reducing pneumatic tubing leak points.
2. 0~30 kgf/cm² High-Pressure Sensing Capability: Calibrated specifically for medium-to-high-pressure marine circuits (up to 2.94 MPa / 426 psi), ensuring accurate linear scaling across the entire operating span.
3. Auto-Tuning PID Algorithm: Features built-in step-response auto-tuning that calculates optimal Proportional Band (P), Integral Time (I), and Derivative Time (D) constants to prevent actuator hunting during sudden load changes.
4. Bumpless Auto/Manual Transfer: Allows watchkeeping engineers to switch seamlessly between automatic PID regulation and manual pneumatic output override from the front panel without causing pressure spikes in the process line.
5. Vibration-Resistant Pilot Relay: Equipped with a balanced flapper-nozzle and high-flow pneumatic booster relay capable of maintaining stable 0.2~1.0 kgf/cm² output pressure even under 4G engine room vibration conditions.

Compatibility

• Pneumatic Control Valves: Nakakita, Yamatake (Azbil), Samson, Fisher, and Koso diaphragm-actuated globe and 3-way valves accepting 0.2~1.0 kgf/cm² signals.
• Pressure Transmitters: BY Controls PT-series, Trafag, Danfoss MBS 3000/3050, and Yokogawa EJA transmitters scaled to 0~30 kgf/cm² (4~20 mA output).
• Valve Positioners: Compatible with standard pneumatic-pneumatic (P/P) positioners (0.2~1.0 kgf/cm² input) for split-range or high-thrust actuator control.

Part Number Cross-References

• Nakakita Seisakusho: NS-700 / NS-800 Series Electro-Pneumatic Controllers (0~30 kgf/cm² range)
• Yamatake / Azbil: SDC35 / SDC36 + HEP15 / HEP16 I/P Converter Assembly
• Tokyo Keiki / Tokimec: EPC Series Pneumatic Process Controllers
• Samson: Type 3730 / Type 4763 (when used as standalone I/P loop controllers)

Frequently Asked Questions

Can the BY Controls EPCON 0~30 kgf/cm² controller accept a direct mechanical pressure tap, or does it require an external transmitter?

The standard EPCON electro-pneumatic controller processes an electronic input signal (4~20 mA DC or 1~5 V DC) from a remote 0~30 kgf/cm² pressure transmitter and converts it into a modulated 0.2~1.0 kgf/cm² pneumatic output. It provides a built-in 24 V DC loop power supply at Terminal 4 to power a 2-wire transmitter directly without an external power supply.

What happens to the pneumatic output of the EPCON controller if shipboard electrical power fails?

Upon loss of electrical power (100~240 V AC or 24 V DC), the internal electromagnetic coil de-energizes, venting the nozzle back-pressure and dropping the pneumatic output (OUT) to 0 kgf/cm² (or minimum 0.2 kgf/cm² depending on zero-spring calibration). This ensures your connected pneumatic control valve moves immediately to its mechanical spring-return fail-safe position (Fail-Open or Fail-Close).

Can this unit replace a Nakakita or Yamatake pneumatic controller on an existing vessel?

Yes. Because the BY Controls EPCON utilizes standard marine instrumentation signals—a 4~20 mA input scaled to 0~30 kgf/cm², a 1.4 kgf/cm² air supply, and a 0.2~1.0 kgf/cm² pneumatic output—it serves as a direct functional replacement for legacy Nakakita and Yamatake electro-pneumatic controllers, requiring only minor panel cutout or pipe-bracket mounting adjustments.

How do I recalibrate the zero and span of the pneumatic output on the BY Controls EPCON?

Enter the controller’s manual calibration mode via the front keypad (or adjust the internal Zero/Span potentiometers on older analog-trimmed revisions) while monitoring the OUT port with a calibrated digital test gauge. Set the output to 0.20 kgf/cm² at 0% drive signal and 1.00 kgf/cm² at 100% drive signal, ensuring the supply pressure remains steady at exactly 1.40 kgf/cm² throughout the procedure.

Do reconditioned units come with a calibration report for Port State Control or Class inspections?

Yes. Every reconditioned and surplus BY Controls EPCON controller undergoes a full bench test across five pressure/signal points (0%, 25%, 50%, 75%, and 100%) and ships with a serialized calibration and leak-test certificate suitable for vessel maintenance logs and classification society audits.