--- title: Why does my gas detector show a percentage but does not activate the alarm immediately? description: Discover why your gas detector shows a percentage without activating the alarm immediately and how to correctly interpret its readings to avoid false alarms. image: https://blog.cuby.mx/hubfs/Stock%20de%20portada%20blogs/detector-gas-marca-porcentaje-no-activa-alarma.png --- [Skip to content](https://blog.cuby.mx/en/detector-gas-marca-porcentaje-no-activa-alarma#main-content) ![menu-toggle](https://21645388.fs1.hubspotusercontent-na1.net/hubfs/21645388/menu-toggle.svg) ![menu-close](https://21645388.fs1.hubspotusercontent-na1.net/hubfs/21645388/menu-close.svg) [![cuby-smart](https://blog.cuby.mx/hs-fs/hubfs/Logos/cuby-smart-logo-100x50px.png?width=100&height=50&name=cuby-smart-logo-100x50px.png)](https://cuby.mx/) - [Home](https://cuby.mx/en) - Products Show submenu for Products - [TERRA (Smart thermostat for mini-split)](https://cuby.mx/en/products/cuby-terra) - [Energy Saving Kit for A/C](https://cuby.mx/en/products/kit-airbnb1-g4-aria-sentry-bee) - 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Escrito por **Cuby Smart** 31 de December, 2025 4 minutos de lectura ☰TABLA DE CONTENIDO Resumen del artículo The percentage shown by [Cuby Protect](https://cuby.mx/en/products/cuby-protect) indicates how close the gas level is to the configured alert threshold, not the actual percentage of gas in the environment. This value is based on the **Lower Explosive Limit (LEL)**, the critical point at which gas could ignite with a spark. **The alarm only sounds at 100% of the configured threshold.** If Cuby Protect is set to 10% of the LEL and the app shows 50%, the gas level is halfway to the alert point. **When it reaches 100% in the app, it means the real gas level has reached 10% of the LEL and the alarm is activated.** If Cuby Protect shows a percentage without sounding the alarm, it is working correctly as an intelligent prevention system, continuously monitoring gas levels and alerting only when the configured safety level is reached. If your gas detector [Cuby Protect](https://cuby.mx/en/products/cuby-protect)shows 50% in the app, but the alarm does not sound, you are probably confused. And that is completely normal. **The good news:** your device is working correctly. **The most common confusion we see is this:** - “I set my alarm to 10%” - “The app shows 50%” - “Why doesn’t it sound if it already passed 10%?” To understand why this is not a problem, you first need to know what your detector is actually measuring.    **![estufa-gas-cocina-apagada](https://blog.cuby.mx/hs-fs/hubfs/Stock%20de%20blogs/estufa-gas-cocina-apagada.png?width=600&height=338&name=estufa-gas-cocina-apagada.png)**   ## **What is the LEL and why does it matter?** LEL stands for **Lower Explosive Limit.** It is a **safety concept** that answers this question: **How much gas needs to be present in the air for there to be a risk of ignition if a spark appears?** **In simple terms:** The LEL is the **critical point** from which a gas concentration could ignite if there is a spark, flame, or another heat source. **Before reaching that point, even if gas is present, there is no explosion risk.**   ### Why do detectors use the LEL as a reference? Because it is an international safety standard. Detectors do not measure “how much gas there is” in an arbitrary way. They measure **how close the gas level is to the critical point (LEL)**. **This allows:** - Having a consistent scientific reference - Comparing danger levels objectively - Configuring early alarms in an intelligent way   ### What does the percentage in the app mean? The percentage you see in the Cuby app **is NOT how much gas there is in the air**. It shows **how close you are to the alert threshold you configured**. It is a **“progress bar” toward your alert point.**   #### **Practical example:** You configured **Cuby Protect** to trigger an alert at **10% of the LEL**: | **What the app shows** | **Real meaning** | **Does the alarm sound?** | | --- | --- | --- | | 25% | You are at **2.5% of the LEL** (25% of the way toward your 10% LEL threshold) | ❌ No | | 50% | You are at **5% of the LEL** (50% of the way toward your 10% LEL threshold) | ❌ No | | 75% | You are at **7.5% of the LEL** (75% of the way toward your 10% LEL threshold) | ❌ No | | **100%** | **You reached your threshold: 10% of the LEL** | ✅ **SÍ** | **The alarm is activated when it reaches 100% and remains at that level for at least 20 seconds.** This helps prevent false alarms caused by momentary spikes.   #### Another way to look at it: If you configured it at **10% of the LEL**: - **0% in the app** = No detectable gas - **50% in the app** = Gas is present, you are at **5% of the LEL** (half of 10%) - **100% in the app** = You reached **10% of the LEL** → **Cuby Protect sends an alert via WhatsApp and a phone call**   ## Why is it recommended setting it at 10% of the LEL? Setting [Cuby Protect](https://cuby.mx/en/products/cuby-protect) to **10% of the LEL** is a standard safety practice because: ✔ **It is a real early warning** - It alerts you **well before any risk exists** - You are **still far from the critical point** ✔ **It gives you time to act calmly** - You can **ventilate the space** - **Locate the source** - **Make decisions without pressure** ✔ **It prevents false alarms** - Small, momentary concentrations **do not trigger the alarm** - It only alerts when there is a **sustained upward trend** ✔ **It is the international standard** - **Complies with safety regulations** - **Recommended by manufacturers and experts**   ![cuby-protect-app-gas-ambiente](https://blog.cuby.mx/hs-fs/hubfs/Stock%20de%20blogs/protect-app-gas-ambiente.png?width=600&height=338&name=protect-app-gas-ambiente.png)   ### Usage recommendations To properly use your [Cuby Protect alarm:](https://cuby.mx/en/products/cuby-protect) **Configuration:** - Keep the threshold between **5% and 10% of the LEL** - Do not set it higher (you would lose the early warning advantage) **If you see percentages in the app:** - **Below 50%:** Minimal gas presence, just monitor - **Between 50–80%:** Consider ventilating the space - **Above 80%:** Ventilate immediately and locate the source - **100%:** The alarm sounds, act according to the safety protocol   ## **Conclusion** The percentage shown by [Cuby Protect](https://cuby.mx/en/products/cuby-protect) is a **“progress bar” toward your alert threshold**, not the actual percentage of gas in the environment. **To remember:** - The **LEL** is the **critical safety point** - The app shows **how close you are to the configured 10%** - The alarm sounds at **100% in the app = 10% of the LEL** If your detector shows **50% but does not sound**, it is doing exactly what it should: **continuously monitoring and alerting you only when you reach the configured level**. **Important:** If that percentage **remains constant and does not go down**, even if it has not reached 100%, you should **ventilate and inspect immediately**. A persistent percentage may indicate an active leak and, **even below the explosive threshold**, prolonged exposure to gas **can represent a risk of intoxication**. The [Cuby Protect gas and carbon monoxide alarm](https://cuby.mx/en/products/cuby-protect) is designed to warn you **well before the situation becomes dangerous**. However, **if you smell gas, do not wait for the alarm to sound**: ventilate, inspect, and act immediately. The human sense of smell can detect LP gas at very low concentrations. It is not just a gas detector. It is an **intelligent prevention system** that keeps you informed **without generating unnecessary alarms**, while also giving you the tools to **act in time when you truly need to**.   [![CTA_Protect_Version B_English](https://no-cache.hubspot.com/cta/default/44673738/interactive-188981124502.png)](https://blog.cuby.mx/hs/cta/wi/redirect?encryptedPayload=AVxigLK79qqoIOyDH8m6mj71%2BcPz0Aq6NXm1oxzkQ87pXjlPd6n2LA4C7t8YXmDCdo7mS793m3%2B4mentiKDl4X4yw3o6ufaepY1BHsH%2BDILwB4fv%2B06KWKRbHeuXh9m5BIhTbw1ayQBJRY8p%2FuJhEg5rHbXw9bcn%2FTGEJu4FJGem7q%2Bez15LmTKyQ0dtFpc%3D&webInteractiveContentId=188981124502&portalId=44673738&hsLang=en)   ## Otros artículos que te pueden interesar... SECURITY ### [Why does my gas detector show a percentage but does not activate the alarm immediately?](https://blog.cuby.mx/en/detector-gas-marca-porcentaje-no-activa-alarma) Por Cuby Smart en 31 de December, 2025 AIR CONDITIONING ### [What is a split type air conditioner and how does it work?](https://blog.cuby.mx/en/aire-acondicionado-tipo-split-como-funciona?hsLang=en) Por Cuby Smart en 02 de September, 2025 ENERGY SAVINGS ### [Cuby Smart vs Universal Remote](https://blog.cuby.mx/en/cuby-vs-control-universal?hsLang=en) Por Cuby Smart en 22 de August, 2025 ### [8 Proven Tips to Stay Cool in 2025](https://blog.cuby.mx/en/como-combatir-el-calor-en-2024-8-consejos-eficaces?hsLang=en) Por Cuby Smart en 20 de August, 2025 [![cuby-smart](https://blog.cuby.mx/hs-fs/hubfs/Logos/cuby-smart-logo-100x50px.png?width=100&height=50&name=cuby-smart-logo-100x50px.png)](https://cuby.mx/) Himalaya 910-11, San Luis Potosí, San Luis Potosí 78216, México [contacto@cuby.mx](mailto:contacto@cuby.mx) +52 444-825-0232   - - - - PRODUCTS - [Energy Saving](https://cuby.mx/en/products/kit-airbnb1-g4-aria-sentry-bee) - [Cuby G4](https://cuby.mx/en/products/cuby-g4) - [Cuby Aria](https://cuby.mx/en/pages/cuby-aria-termostato-inteligente) - [Sentry](https://cuby.mx/en/products/sentry-sensor-de-presencia) - [Bee](https://cuby.mx/en/products/bee-sensor-de-apertura) - [Aria](https://cuby.mx/en/products/aria-2-0-control-de-pared-para-minisplit) - [Modbus](https://cuby.mx/en/products/cuby-modbus) - [Cuby Helios](https://cuby.mx/en/products/cuby-helios-pro-medidor-gas-lp) - [Cuby Protect](https://cuby.mx/en/products/cuby-helios-pro-medidor-gas-lp) - [Xmatch](https://cuby.mx/en/products/xmatch-2-0) - [Zen](https://cuby.mx/en/products/zen-sensor-de-temperatura-y-humedad-relativa) BUSINESS - [Hotels](https://pages.cuby.mx/en/lp-centraliza-uso-aire-acondicionado-hoteles) - [Schools](https://pages.cuby.mx/en/lp-centraliza-automatiza-a/c-instituciones-educativas) - [Businesses](https://pages.cuby.mx/en/lp-automatiza-controla-negocio) - [Data Center](https://pages.cuby.mx/en/lp-proteccion-monitoreo-a/c-data-center) INFORMATION - [About Cuby](https://pages.cuby.mx/en/sobre-nosotros-cuby-smart) - [Help Center](https://help.cuby.mx/en) - [Automation](https://cuby.mx/en/pages/automatizacion-ahorro-energia-deshumidificacion) - [Blog](https://blog.cuby.mx/en) - [API](https://pages.cuby.mx/en/integradores) - [Billing](https://cuby.mx/en/pages/factura-tu-compra) POLICIES - [Privacy Policies](https://cuby.mx/en/pages/politica-de-privacidad) - [Terms and Conditions](https://cuby.mx/en/pages/terminos-y-condiciones) - [Shipping and Return Policies](https://cuby.mx/en/pages/envios-y-devoluciones) - [Notice of Privacy](https://cuby.mx/en/pages/aviso-de-privacidad) - [Warranty](https://cuby.mx/en/pages/garantia-defectos-fabrica) © 2025 Arteko Electronics SA de CV. 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