SPIRAX SARCO · CONTROL VALVES
Spirax Sarco EP6 Electro-pneumatic Positioner for Pneumatic Valve Actuators
Spirax Sarco EP6 electro-pneumatic positioner for precise control of pneumatic valve actuators. 4-20mA input, IP66 rated. Available at PC Engineering
Overview
The Spirax Sarco EP6 is an electro-pneumatic positioner designed for precise control of pneumatic valve actuators in industrial process applications. It converts a 4-20 mA electrical input signal into a proportional pneumatic output, ensuring accurate valve positioning for both linear and rotary actuators conforming to NAMUR standards.
Built with a die-cast aluminium housing and anti-corrosive finish, the EP6 is engineered for demanding industrial environments including outdoor installations. The positioner supports linear actuator strokes from 20 mm to 150 mm and rotary movements from 55° to 90°, making it compatible with a wide range of Spirax Sarco pneumatic actuators including the PN series, TN series, and PNS3000/4000 series.
The EP6 offers single-acting, single-acting with reduced orifice, and double-acting configurations. It can also reverse the action of the control signal when required, providing flexibility in valve control strategies across various process control applications.
Key Features
- Input signal range of 4-20 mA with split range capability (minimum 8 mA amplitude)
- Compatible with NAMUR-conforming linear (20-150 mm) and rotary (55-90°) actuators
- IP66 ingress protection for harsh industrial environments
- Die-cast aluminium housing with anti-corrosive RAL9016 finish
- Standard and high-temperature versions available (-20°C to +120°C)
- Built-in pressure gauge for actuator air pressure indication
- Reversible control signal action
- Low steady-state air consumption of 2.4 LPM at 1.4 bar
Specifications
| Parameter | Value |
|---|---|
| Input Signal | 4-20 mA (split range min. 8 mA) |
| Impedance | Max 250 ±15 Ω |
| Air Supply Pressure | 1.4 to 7.0 bar |
| Air Quality Requirement | ISO 8573-1:2010 Class 3:3:2 |
| Output Pressure | 0 to 100% of supply pressure |
| Actuator Stroke (Linear) | 20 mm to 150 mm |
| Actuator Stroke (Rotary) | 55° to 90° |
| Operating Temperature (Standard) | -20°C to +70°C |
| Operating Temperature (High Temp) | -20°C to +120°C |
| Air Flow | 80 LPM @ 1.4 bar |
| Steady State Air Consumption | 2.4 LPM @ 1.4 bar |
| Air Connections | ¼" NPT female |
| Sensitivity (Single Acting) | ±0.2% F.S. |
| Sensitivity (Double Acting) | ±0.5% F.S. |
| Hysteresis | ±1% F.S. |
| Linearity (Single Acting) | ±1% F.S. |
| Linearity (Double Acting) | ±2% F.S. |
| Repeatability | ±0.5% F.S. |
| Ingress Protection | IP66 |
| Electrical Connection | M20 cable gland, 0.5-2.5 mm² wire |
| Housing Material | Die-cast aluminium |
| Weight (Positioner Only) | 2.8 kg |
| Weight (Rotary with Kit) | 4.1 kg |
Applications
The EP6 electro-pneumatic positioner is used across manufacturing and process industries requiring precise pneumatic valve control:
- Steam systems — Temperature and pressure control in boiler plants and steam distribution networks - Process industries — Flow and level control in chemical, pharmaceutical, and food processing plants - HVAC systems — Heating and cooling medium regulation in large commercial and industrial facilities - Power generation — Feedwater and condensate system valve control - Pulp and paper — Process steam and chemical dosing control - Oil and gas — Process control valves in refineries and petrochemical plants
Compatible with Spirax Sarco actuators: PN9100-9400, TN2150-2400, PN3000-6000, PNS3000/4000, and PN1600 series.
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Frequently Asked Questions
Get a Quote
Contact PC Engineering for pricing, availability, and technical support for the Spirax Sarco EP6 Electro-pneumatic Positioner. Call us or fill in our inquiry form — our engineers will respond within 24 hours.
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