The traditional way to find methane leaks is to send a technician around a site a few times a year with a camera or sniffer, but a leak that starts the day after a survey can run undetected until the next one. Continuous methane monitoring closes that gap by leaving fixed sensors on site that watch for methane all the time. This guide explains how continuous site-level methane monitoring with sensor networks works as an emerging alternative to periodic leak surveys, how combining concentration readings with wind data helps localize a leak, and how the resulting alarms and quantified events integrate with a SCADA platform.
Continuous Methane Monitoring in one line: Continuous methane monitoring uses fixed sensors installed permanently at a site to detect methane around the clock, rather than relying on a technician visiting periodically. A network of point sensors, or sensors placed around the site perimeter, measures methane concentration continuously, and by combining those readings with wind speed and direction the system can estimate where a leak originates and how large it is. It is emerging as an alternative or complement to periodic leak detection and repair surveys, catching leaks between the scheduled visits those programs rely on.
Periodic leak detection and repair, usually abbreviated LDAR, works by scheduling surveys at some interval, during which a technician checks each component for leaks with an optical gas imaging camera or a portable analyzer. The method is thorough at the component level but has an inherent blind spot: it only sees the site on the days a survey happens. A leak that develops right after a survey can emit for the entire interval until the next one, and because leaks often start suddenly from a failed seal or a stuck valve, that exposure can be significant.
Continuous monitoring attacks that blind spot directly by never leaving. Fixed sensors installed at the site measure methane all the time, so a leak that starts is detected within hours rather than waiting for the next scheduled visit. The tradeoff is that a fixed site-level system typically detects and localizes a leak to an area rather than pinpointing the exact leaking component the way a handheld survey does, so the two approaches are often complementary: continuous monitoring raises the alarm and narrows the search, and a targeted survey then finds the specific component to repair.
Because it shortens the time a leak goes unnoticed, continuous monitoring is increasingly recognized as an alternative or supplement to a fixed survey schedule within evolving methane rules. The regulatory framing varies, but the underlying logic is consistent: a system that watches continuously and triggers a prompt investigation can achieve comparable or better emission reductions than surveys spaced months apart, because the emitting time per leak is so much shorter.
A single methane concentration reading tells you that gas is present but not where it came from, because the wind carries a plume away from its source before it reaches a sensor. This is why continuous monitoring pairs concentration measurements with meteorological data, especially wind speed and direction. Knowing that a sensor saw elevated methane while the wind was blowing from a particular bearing points back toward the part of the site upwind of the sensor, narrowing down the likely origin.
With a network of sensors rather than a single one, the localization improves considerably. Different sensors around a site see the plume with different intensity and at different times depending on where the wind is carrying it, and combining those readings with the wind field lets the system triangulate the source area and, with an atmospheric model, estimate the emission rate. The result is not just an alarm that methane is present but an estimate of where the leak is and how big it is, which is far more actionable for a crew heading out to find and fix it.
Quantification, turning a set of concentration readings and wind data into an estimated leak rate in mass per time, is what lets an operator prioritize. A large release deserves an immediate response, while a small, steady reading might be scheduled for the next planned visit. By producing a quantified, located event rather than a bare detection, continuous monitoring gives operators the information to respond proportionately rather than treating every whiff of methane the same.
Continuous methane sensors produce a stream of data, and that data is far more useful when it lives alongside everything else known about the site rather than in an isolated app. A cloud SCADA platform such as Merobix can ingest the methane concentration readings and the associated wind data as additional inputs, treat a localized, quantified detection as an alarm like any other, and route it to the same operators who already watch the site's pressures, levels, and equipment status.
The real advantage of bringing methane events into SCADA is context. When a methane alarm arrives with a location estimate, an operator looking at the same platform can immediately see what equipment sits in that area and what it was doing at that moment: whether a tank was being filled, a compressor tripped, a controller vented, or a valve changed state. That side-by-side view accelerates root-cause analysis, because the operator can often match a detected release to a specific event in the site telemetry instead of driving out to guess.
Integration also serves the documentation that methane programs increasingly require. When a detected event, its estimated rate, the wind conditions, the localization, and the subsequent investigation and repair all sit in one platform with time stamps, the operator has a coherent record of what was detected, when, where, and what was done about it. For a company monitoring methane across many sites, having those events flow into the same system that runs operations is what makes continuous monitoring a practical part of daily work rather than a separate stream of alerts to reconcile.
LDAR surveys send a technician to check components a few times a year, which is thorough at the component level but only sees the site on survey days. Continuous monitoring leaves fixed sensors on site that watch for methane all the time, catching leaks within hours instead of waiting for the next scheduled visit. The two are often complementary, with continuous monitoring raising the alarm and a targeted survey finding the exact component.
It combines methane concentration readings with wind speed and direction. Because wind carries a plume away from its source, knowing the wind direction when a sensor sees elevated methane points back toward the upwind part of the site. With a network of sensors and an atmospheric model, the system can triangulate the source area and estimate the emission rate, producing a located, quantified event rather than a bare detection.
In some evolving regulatory frameworks it can serve as an alternative or complement to a fixed survey schedule, because watching continuously shortens the time a leak goes undetected. However, a fixed site-level system usually localizes a leak to an area rather than pinpointing the exact component, so a targeted survey is often still used to find the specific point to repair after continuous monitoring raises the alarm.
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