| Brand: | Koso |
|---|---|
| Power: | Electric |
| Adjusted Form: | Switching Type |
|
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KOSO EPB800 Electro-Pneumatic Valve Positioner (Comprehensive Product Introduction)
1. Overview
The KOSO EPB800 is a specialized electro-pneumatic valve positioner designed for precise control of pneumatic actuators, particularly tailored for the 5200LA actuator series
As part of the EP800 series, it converts a 4-20 mA DC input signal into proportional pneumatic output pressure, enabling accurate valve positioning through real-time feedback from the actuator stem
This device is widely used in industrial automation systems, including oil and gas, chemical processing, power generation, and water treatment, where reliable and precise flow control is critical
2. Key Specifications
Below are the technical parameters that define the EPB800's performance:
2.1 Input Signal & Characteristics
Input Signal: 4-20 mA DC (standard), with options for split-range control (4-12 mA or 12-20 mA)
Linearity: ±1.0% (single-acting type)
Hysteresis: ≤0.5%
Repeatability: 0.2%
2.2 Pneumatic Performance
Air Supply Pressure: 140-700 kPa (1.4-7 bar)
Air Consumption:
5 Nl/min at 140 kPa (50% output pressure)
15 Nl/min at 400 kPa (double-acting mode)
Max. Airflow Capacity:
175 Nl/min at 140 kPa (single-acting, atmospheric discharge)
400 Nl/min at 400 kPa (double-acting)
2.3 Environmental Tolerance
Temperature Range:
Standard: -20°C to +80°C
Low-temperature variant: -50°C to +60°C
High-temperature variant: 0°C to +100°C
Enclosure Protection: Weatherproof, explosion-proof (Ex d, Ex ia), and intrinsically safe designs
2.4 Mechanical & Electrical Interfaces
Air Connections: Rc 1/4
Electrical Connections: G1/2 or 1/2" NPT (explosion-proof models)
Housing Material: Aluminum alloy with epoxy coating
3. Design Features
3.1 Precision Feedback Mechanism
The EPB800 employs a cam-based feedback system to ensure linear or customizable output characteristics (e.g., equal percentage)
Its linkage mechanism is optimized for the 5200LA actuator, providing direct stroke feedback for high accuracy even under variable load conditions
3.2 Adaptive Actuator Compatibility
Single-Acting Actuators: Default configuration for spring-return actuators
Double-Acting Capability: Can be adapted for dual-chamber piston actuators with minimal adjustments
3.3 Low Air Consumption & High Efficiency
The nozzle-flapper amplifier design minimizes air usage while maintaining rapid response times (sensitivity: 0.1%)
This efficiency reduces operational costs in high-cycle applications
3.4 Explosion-Proof Safety
Certified for hazardous environments:
Ex d (Flameproof): Compliant with ATEX/IECEx standards for Zone 1/21
Ex ia (Intrinsic Safety): Suitable for Zone 0/20 with external safety barriers
4. Functional Advantages
4.1 Versatile Configuration Options
Split-Range Control: Adjustable input spans (e.g., 4-12 mA or 12-20 mA) for multi-valve coordination
Reverse Action Capability: Converts from direct to reverse action by reconfiguring the amplifier
4.2 Ease of Maintenance
Auto-Manual Switch: Allows manual override without disconnecting the control signal
Modular Components: Field-replaceable parts, including nozzles, diaphragms, and feedback springs
4.3 Robust Construction
Corrosion Resistance: Epoxy-coated aluminum housing withstands harsh chemicals and humidity
IP65 Rating: Dust-tight and protected against water jets (weatherproof models)
| Parameter | Details |
| Model | EPB800 Series (Includes EPB801, EPB811, EPB821, etc.) |
| Input Signal | 4-20 mA DC (adjustable split ranges: 4-12 mA, 12-20 mA) |
| Air Supply Pressure | 0.14-0.7 MPa (140-700 kPa) |
| Air Consumption | - Single-acting: 5 NL/min (at 140 kPa) - Double-acting: 15 NL/min (at 400 kPa) |
| Linearity | ±1.0% FS (single-acting); ±1.5% FS (double-acting) |
| Hysteresis | ≤0.5% FS (single-acting); ≤0.8% FS (double-acting) |
| Repeatability | ≤0.2% FS |
| Output Characteristics | Linear (default); customizable to equal percentage or quick-opening via cam mechanism |
| Housing Material | Aluminum alloy |
| Weight | 2.3-3 kg |
| Environmental Temperature | Standard: -20°C to +60°C; Extended range: -40°C to +80°C |
| Explosion-proof Ratings | Flameproof (ExdCT6)-Intrinsically Safe (ExiaCT6) with safety barriers |
| Applications | Oil & gas, chemical processing, power plants, metallurgy, light industry; compatible with pneumatic actuators, control valves, ball valves, and butterfly valves |
5. Applications
The EPB800 is ideal for:
Control Valves: Globe, ball, and butterfly valves in process industries
Power Plants: Feedwater control, steam regulation .
Oil & Gas: Pipeline pressure management, refinery flow control
Water Treatment: Flow modulation in pumps and dosing systems .
6. Installation & Calibration
6.1 Mounting Guidelines
Align the positioner with the actuator stem to avoid mechanical stress
Use Rc 1/4 fittings for air supply and ensure leak-free connections
6.2 Calibration Steps
Zero Adjustment: Set the input signal to 4 mA and adjust the zero screw until the actuator reaches the closed position
Span Calibration: Apply 20 mA input and fine-tune the span screw for full actuator travel
Feedback Calibration: Verify linearity using a 25%, 50%, and 75% input signal .
7. Safety & Certifications
ATEX/IECEx: Ex d IIB+H2 T6 / Ex ia IIC T6
NEPSI/KOSHA: Certified for use in South Korea and Japan
Compatible Safety Barriers: MTL728, LB928, or equivalent Zener barriers for intrinsic safety
8. Ordering Information
Standard Model: EPB800(specify temperature variant and explosion-proof rating)
Optional Accessories:
Feedback kits for rotary actuators
Pressure gauges in kPa, bar, or psi .
9. Conclusion
The KOSO EPB800 combines precision, durability, and adaptability, making it a top choice for critical valve control applications. Its compliance with international safety standards, low maintenance requirements, and energy-efficient design ensure long-term reliability in demanding environments. For detailed technical drawings or customized configurations, refer to KOSO's official documentation or authorized distributors
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