Product Overview
The SPIRAX SARCO ISP5 is a high-performance electropneumatic smart positioner engineered for precise control of pneumatic control valves in demanding industrial process environments. Unlike conventional force-balance or mechanical positioners, the ISP5 utilizes advanced microprocessor-based technology to deliver exceptional positioning accuracy, rapid response times, and superior vibration immunity. As a core component within the Spirax Sarco automation ecosystem, this smart positioner serves as the critical interface between the control system signal (4-20 mA) and the pneumatic actuator, ensuring optimal valve stem positioning for accurate flow, pressure, or temperature regulation. Its robust design and intelligent diagnostics make it an ideal solution for modern process automation requiring high reliability and minimal maintenance.
Technical Specifications
| Parameter | Specification / Feature |
|---|---|
| Component Type | Electropneumatic Smart Positioner (Valve Positioner / Automation Sensor) |
| Model Designation | ISP5 |
| Input Signal | 4–20 mA DC (Standard Industrial Control Signal) |
| Operating Pressure | Standard Industrial Grade (Up to rated bar, typically 1.4–7 bar / 20–100 psi) |
| Mounting & Connection | Standard ISO / Manufacturer Interface (NAMUR / Spirax Sarco specific mounting) |
| Communication Protocol | HART Communication (for configuration and diagnostics) |
| Enclosure Rating | IP66 / NEMA 4X (Weatherproof and corrosion-resistant) |
Engineering Features & Advantages
- Precision Performance: Advanced microprocessor control ensures highly accurate valve positioning with minimal deadband and hysteresis, optimizing process control loops and reducing product variability.
- Industrial Reliability: Built for continuous operation under severe industrial conditions, featuring a rugged enclosure and resistance to shock and vibration, ensuring long-term stability in harsh plant environments.
- Direct Fit Replacement: Exact dimensional and functional compatibility with original OEM standards, allowing for seamless integration and simplified retrofitting onto existing Spirax Sarco or compatible pneumatic actuators.
- Intelligent Diagnostics: On-board self-diagnostics and HART communication enable predictive maintenance, valve signature analysis, and remote configuration, minimizing downtime and maintenance costs.
- Auto-Calibration: Automatic zero and span adjustment simplifies commissioning and ensures consistent performance over time without manual re-calibration.
Typical Industrial Applications
The SPIRAX SARCO ISP5 Electropneumatic Smart Positioner is widely deployed in critical process control applications across multiple heavy industries. It is commonly used in chemical and petrochemical plants for precise flow and pressure control on control valves, in power generation facilities for steam and water regulation, in pharmaceutical and food processing where accurate and repeatable valve positioning is essential for batch consistency, and in HVAC and district heating systems for reliable temperature and flow management. Its robust design also makes it suitable for water treatment and marine applications where environmental conditions demand high IP-rated protection and dependable automation performance.
PRODUCT IMAGES

SPIRAX SARCO ISP5 Electropneumatic Smart Positioner
⚡ Emergency Plant Maintenance & Ready-to-Ship Notice:
- Authentic & Fully Tested: 100% bench tested for hydraulic response, pressure rating, and null-bias stability before dispatch.
- Fast Dispatch: In-stock units ready for same-day dispatch via DHL / FedEx Express directly to your plant.
- Pre-Shipment Verification: High-definition photos, video testing runs, and serial number verification provided prior to shipment.
- Peace of Mind: Covered by our 12-Month Replacement Warranty.
Shop the genuine SPIRAX SARCO ISP5 Solenoid Valve. This UK-made 24V DC hydraulic component features a direct-acting design, delivering leak-free, reliable fluid control for heavy-duty industrial systems.