The Spirax Sarco EP6SLS1-A is a reliable electro-pneumatic positioner that converts a 4-20 mA control signal into precise pneumatic output for accurate valve positioning. Designed for single-acting linear actuators conforming to NAMUR, it ensures exact proportionality between input signal and valve stroke, with a rugged die-cast aluminum housing suitable for outdoor installation.
| Input Signal | 4-20 mA (split range minimum amplitude 8 mA) |
| Impedance | Max 250 ±15 Ω |
| Air Supply | 1.4 to 7.0 bar (regulate 5 to 10 psi above actuator spring range) |
| Air Quality | ISO 8573-1:2010 Class 3:3:2 |
| Output Pressure | 0 to 100% of supply pressure |
| Actuator Stroke (Linear) | 20 mm to 150 mm |
| Action | Single acting / fail vent |
| Operating Temperature | Standard -20 °C to +70 °C |
| Air Flow | 80 LPM @ 1.4 bar |
| Steady-State Air Consumption | 2.4 LPM @ 1.4 bar |
| Air Connections | ¼" NPT female |
| Electrical Connections | M20 cable gland, terminals for 0.5 to 2.5 mm² conductors |
| Sensitivity | ±0.2% F.S. (single acting) |
| Hysteresis | ±1% F.S. |
| Linearity | ±1% F.S. (single acting) |
| Repeatability | ±0.5% F.S. |
| Degree of Protection | IP66 |
| Housing Material | Die-cast aluminium (anti-corrosive paint RAL9016) |
| Shipping Weight | Approx. 2.8 kg (positioner only; mounting kit extra) |
Well-suited for modulating control of pneumatic control valves in steam systems, heating circuits, process lines, and industrial plants—particularly with Spirax Sarco actuators like PN9000, TN2000, or PNS series where accurate positioning improves efficiency and response.
Q: What actuators does it work with?
A: Any NAMUR-compatible linear or rotary pneumatic actuators; linear stroke 20–150 mm.
Q: Is it loop-powered?
A: Yes—two-wire, powered directly by the 4-20 mA signal.
Q: Can it be used outdoors?
A: Yes, with IP66 protection and treated aluminum housing.
Q: What's the air supply requirement?
A: Clean, dry air 1.4–7 bar per ISO 8573-1:2010 Class 3:3:2.
Q: Does it include a gauge?
A: Standard models often feature a supply/output pressure gauge.
Our team can help with mounting kit selection, sizing, or availability—reach out for your control valve setup.
Consider the EP6 rotary version (EPR) for quarter-turn actuators, or pair with Spirax Sarco PN9000 series pneumatic actuators for complete assemblies.
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