Yes, they connect to any LoRaWAN or MQTT infrastructure (Kerlink, Cisco, Milesight, MultiTech, etc.) for flexible integration with existing SCADA systems.
Relief Valve Acoustic Monitoring
Early chatter detection and abnormal discharge visibility
Acoustic
Quick Overview
| Problem | Relief valves may pass or leak without visible indication, making it difficult to detect abnormal discharge conditions. |
| Solution | SENSAiO acoustic sensors continuously monitor sound signatures associated with flow through relief valves. |
| Value | Improved visibility on valve behavior, supporting earlier identification of abnormal or unintended flow events. |
| ATEX | Suitable for hazardous environments (Zone 1–2), compliant with ATEX / IECEx requirements. |
The Operational Challenge
Relief valves are designed to protect equipment from overpressure by releasing fluid when pressure exceeds a set threshold.
Under normal conditions, relief valves remain closed. However, several abnormal situations may occur:
- Valve passing (minor leakage while nominally closed)
- Intermittent or partial opening below set pressure
- Continuous discharge due to process instability or valve malfunction
When fluid flows through a relief valve, even at low rates, it generates:
- High-velocity flow through a restricted orifice
- Turbulence downstream of the valve seat
- Acoustic emissions, often in high-frequency ranges
Detecting these conditions is challenging because:
- Small discharges may not be visible
- Vent lines may discharge to flare systems or elevated نقاط
- Traditional monitoring focuses on pressure, not flow through the valve
- Manual inspection is intermittent
As a result, unintended valve activity may remain undetected.
Why Acoustic Monitoring Matters
Acoustic monitoring captures the sound generated by turbulent flow through the relief valve.
When a valve is passing or discharging:
- Fluid acceleration through the valve seat produces broadband acoustic energy
- The intensity and pattern of this acoustic signal can change with flow conditions
Continuous acoustic monitoring enables:
- Detection of abnormal sound signatures indicating flow through the valve
- Identification of changes in acoustic intensity over time
- Differentiation between silent (fully closed) and active (flowing) states
Typical interpretations include:
- A persistent acoustic signal may indicate continuous valve passing
- Intermittent acoustic activity may correlate with unstable operating conditions
- An increase in acoustic intensity may reflect increased flow through the valve
Acoustic data provides an indirect indication of valve behavior.
SENSAiO Solution
SENSAiO deploys wireless acoustic sensors installed on or near relief valves and associated discharge piping.
Sensors continuously measure acoustic activity and transmit data via LoRaWAN to a centralized monitoring platform.
The system provides:
- Continuous monitoring of acoustic levels
- Detection of deviations from baseline (silent valve condition)
- Alerts when abnormal acoustic activity is detected
It is important to clarify that:
- SENSAiO is a monitoring-only system
- It does not confirm valve set pressure or calibration
- It does not quantify discharge flow rate
- It does not replace safety or pressure protection systems
The system supports operational awareness and maintenance investigation.
Results and ROI
ATEX Compliance and Safety
Relief valves are typically installed in hazardous areas where flammable fluids are present. SENSAiO sensors:
- Are available with ATEX / IECEx certification for Zone 1–2
- Are designed for industrial environments with temperature and vibration constraints
- Can be deployed near process equipment and piping
All equipment is provided with appropriate certification documentation.
SENSAiO systems are not safety systems and do not replace relief valve functionality or regulatory requirements.
Integration and compatibility
| Protocols | LoRaWAN, MQTT, REST API |
| Gateways | Compatible with standard LoRaWAN gateways (Kerlink, Multitech, Cisco, etc.) |
| Systems | Integration with plant monitoring and maintenance systems |
| Deployment | Suitable for retrofit on existing relief valves |
FAQ - Common Questions
Are Sensa.io sensors compatible with any gateway or network?
What ATEX certifications apply to Sensa.io devices?
All hazardous-area models are certified Ex II 2 G Ex ia IIC T4 Gb and IECEx approved for Zones 0–2.
What is the typical battery life?
Up to 10 years at 15-minute intervals, depending on signal strength and environment.
How are the sensors integrated into existing systems?
Through standard protocols — LoRaWAN, Modbus, MQTT, REST API — no proprietary middleware needed.
How does predictive maintenance reduce OPEX?
Early anomaly detection reduces emergency interventions by 30–40 %, extends equipment life and lowers energy costs.
What does the Sensa.io Valve Position Sensor actually measure?
The device detects real-time valve position states—open, closed, or intermediate—with high accuracy. It continuously sends this information wirelessly to your monitoring dashboard.
Can this sensor detect partial valve movement or stuck valves?
Yes. The sensor identifies irregular patterns such as partial movement, delayed response, or stuck valves, enabling early maintenance before failure occurs.
Is this sensor suitable for manual, motorized, and actuated valves?
Yes. It supports a wide range of valve types including ball, gate, butterfly, actuator-driven, and manual valves.
How fast does it update the valve position?
You can configure the reporting interval—from seconds to minutes—depending on your operational and battery needs.
How long does installation take?
Most installations take under 10 minutes. The sensor mounts using brackets or clamps without modifying existing valves.
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