When it comes to gas leak detection, many people might take it for granted that installing a detector is all it takes to be safe. But in reality, different types of detectors can perform drastically differently when it matters most. Today, we’ll compare two types of flammable gas detectors—telemetry and point detectors—to see which offers higher detection efficiency and truly deserves the title of "eagle eye" for safety.

Simply put, the biggest difference between these two detectors lies in their completely different "working methods":

Telemetry detectors: Act like a "scanner," measuring the concentration of the entire gas cloud formed by a leak. As long as a gas cloud from a leak is within their "line of sight" (e.g., within 100 meters), they can detect it quickly.

Point detectors: Function more like a "stationary sentinel," only measuring the gas concentration at the single point where they are installed. They will only trigger an alarm if the leaking gas happens to drift to their location and reaches a certain concentration.

This difference in working methods directly leads to a huge gap in their detection efficiency.

Three Key Indicators to Determine the Winner

1. Detection Range: Telemetry is a "Telescope," Point Detector is a "Myopia Glass"

Telemetry detectors have a much longer detection range than point detectors. As long as the leaking gas cloud is within their effective range, it can be detected regardless of distance. In contrast, point detectors have an extremely limited detection range and may "turn a blind eye" to leaks even slightly farther away.

2. Response Speed: Telemetry is a "Flash," Point Detector is a "Slowpoke"

Telemetry detectors respond immediately once they "see" a gas cloud, unaffected by gas diffusion speed. Point detectors, however, need to wait for the leaking gas to slowly drift to their location—a process influenced by wind direction, air flow, and other factors, with an entirely uncontrollable timeline.

3. Numerical Stability: Telemetry is a "Steadfast Anchor," Point Detector is a "Drifter"

Telemetry detectors read the total concentration of the entire gas cloud, resulting in relatively stable values. Point detector readings, on the other hand, are highly prone to fluctuations—even minor air flow changes can cause them to return to zero, making it difficult to trigger a stable alarm.

Experimental Data Speaks Volumes

Experimental results vividly demonstrate the gap between the two:

At a leak rate of 1 liter per minute and the same detection height, the telemetry detector detected the gas in just 14 seconds from over 4 meters away from the leak source. The point detector, however, took 55 seconds even at the leak location, and failed to detect it for more than 10 minutes at greater distances.

Regarding concentration stability, point detector readings fluctuated repeatedly between 0 and 0.56 due to external interference, sometimes even returning to zero. Telemetry detector readings, by contrast, remained highly stable.

Conclusion: Choose Based on Scenarios

Overall, both detectors have their own strengths and are suited for different scenarios:

Telemetry detectors: Ideal as a large-scale "early warning system," especially for outdoor, open, or complex environments. They can quickly detect distant leaks with high sensitivity, truly living up to the name of "eagle eye."

Point detectors: Better suited for close-range, fixed-point monitoring of known risk points in confined spaces. Multiple units need to be installed near key equipment to form an effective protection network.

There is no absolute "better" or "worse"—only what’s appropriate. Choosing the right detector based on specific usage scenarios is the key to truly preventing accidents before they happen.