Yes, they connect to any LoRaWAN or MQTT infrastructure (Kerlink, Cisco, Milesight, MultiTech, etc.) for flexible integration with existing SCADA systems.
Boil-Off Gas (BOG) Pressure Monitoring
Improved stability visibility and anomaly triage
Pressure
Quick Overview
| Problem | Boil-off gas pressure variations can develop due to thermal or operational effects and are not always continuously monitored at critical points. |
| Solution | SENSAiO pressure sensors monitor BOG pressure trends across LNG systems in real time. |
| Value | Improved visibility on vapor pressure behavior, supporting earlier detection of abnormal pressure conditions. |
| ATEX | Suitable for LNG hazardous environments (Zone 1–2), compliant with ATEX / IECEx requirements. |
The Operational Challenge
In LNG systems, boil-off gas (BOG) is generated when a portion of the liquid LNG vaporizes due to heat ingress.
BOG management is critical for:
- Maintaining tank pressure within operational limits
- Avoiding excessive venting or flaring
- Ensuring stable process conditions
Pressure in BOG systems is influenced by:
- Heat transfer into storage tanks or lines
- LNG temperature variations
- Efficiency of BOG compressors or reliquefaction systems
- Flow restrictions or control valve behavior
From a physical standpoint:
- Vapor generation increases gas volume and pressure
- Restricted flow or insufficient compression leads to pressure buildup
- Pressure fluctuations may reflect dynamic system balance between generation and removal
Detection challenges include:
- Pressure variations can be gradual or transient
- Systems are distributed across large LNG facilities
- Instrumentation may be limited to key points
- Localized pressure effects may not be visible at system level
As a result, abnormal pressure behavior may not be immediately identified.
Why Pressure Monitoring Matters
Pressure is a direct indicator of vapor system behavior.
By continuously monitoring BOG pressure:
- Baseline operating conditions can be established
- Deviations from normal pressure ranges can be detected
- Pressure trends can be analyzed over time
Typical interpretations include:
- A gradual pressure increase may indicate increased boil-off or reduced gas handling capacity
- A rapid pressure rise may correlate with operational upset or restriction
- Pressure oscillations may reflect unstable control or compressor behavior
Pressure monitoring provides a direct and physically meaningful insight into BOG system dynamics.
SENSAiO Solution
SENSAiO deploys wireless pressure sensors installed on BOG lines, storage tanks, or vapor handling systems.
Sensors continuously measure pressure and transmit data via LoRaWAN to a centralized monitoring platform.
The system provides:
- Continuous pressure trend monitoring
- Detection of abnormal pressure deviations
- Alerts based on threshold exceedance or unusual patterns
It is important to clarify that:
- SENSAiO is a monitoring-only system
- It does not control BOG compressors or valves
- It does not calculate boil-off rates directly
- It does not replace pressure control or safety systems
The system supports operational awareness and investigation.
Results and ROI
ATEX Compliance and Safety
BOG systems handle flammable gas and are located in hazardous areas. SENSAiO sensors:
- Are available with ATEX / IECEx certification for Zone 1–2
- Are designed for gas handling and cryogenic environments
- Can be installed on vapor lines and associated equipment
All equipment is delivered with appropriate certification documentation.
SENSAiO systems are not safety systems and do not replace pressure control systems, compressors, or regulatory safety requirements.
Integration and compatibility
| Protocols | LoRaWAN, MQTT, REST API |
| Gateways | Compatible with standard LoRaWAN gateways (Kerlink, Multitech, Cisco, etc.) |
| Systems | Integration with LNG monitoring and maintenance platforms |
| Deployment | Suitable for retrofit on existing BOG systems |
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.
Explore Our Sensors
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The SENSAiO Valve Position Sensor provides real-time open/close feedback for manual and automated valves in oil & gas, chemical, and hydrogen operations.
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A rugged, industrial-grade pressure sensor designed for high-demand oil & gas applications. Provides continuous gas and liquid pressure monitoring, with ATEX intrinsic safety, IP67 housing, and LoRaWAN® connectivity.
Temperature
SENSAiO’s temperature sensor delivers precise temperature data for process lines, steam systems, heat exchangers, and storage assets.
Differential Pressure (ΔP)
A compact DP solution using dual synchronized pressure inputs to deliver accurate differential pressure data for filters, heat exchangers, separators, and manifolds.
Vibration
A high-resolution vibration sensor built for predictive maintenance of pumps, motors, compressors, and rotating equipment.
Acoustic
The SENSAiO acoustic sensor identifies ultrasonic leak signatures, gas escape, steam trap failures, and flare noise anomalies.
Trusted by a Worldwide Network
With partners in over 20 countries, SENSAiO delivers rugged sensor solutions to the toughest environments — everywhere.
