As Leak Alarm Sensor for CNG LPG Vehicle
This vehicle gas leak alarm sensor is for CNG and LPG conversions. It watches gas concentration in the engine bay or fuel system area. If gas reaches the alarm point you set, it sends an alarm signal. It fits new conversions, old alarm replacement, and safety upgrades on passenger cars, SUVs, and light commercial vehicles. It does not shut off the tank by itself. It warns you. For shutoff, you need the right control system and valve.
Product Introduction
This sensor is made for automotive CNG and LPG conversion systems. It keeps an eye on gas concentration around the engine bay or fuel system area. When it detects a leak risk, it sends an alarm. You can use it on a new gas conversion, to replace an old alarm that has gone slow or dead, or to upgrade the safety system on passenger cars, SUVs, and light commercial vehicles. It is a warning sensor, not a shutoff valve. If you want automatic shutoff, check that your control system and valve can work together.
Product Parameter
| Item | Specification |
|---|---|
| Product Name | Vehicle Gas Leak Alarm Sensor |
| Applicable Fuel | CNG, LPG, natural gas, liquefied petroleum gas, butane, gasoline vapor and other flammable gases |
| Operating Voltage | DC 8V - 15V |
| Working Current | 75mA |
| Output Signal | Analog signal 0-5V / PWM digital signal |
| Detection Accuracy | ±10% LEL |
| Alarm Concentration | 5% - 25% LEL, adjustable |
| Response Time | ≤10s |
| Protection Grade | IP54 |
| Plug Standard | DJ7041-1.5-21 |
| Dimension | 78 × 29 × 28mm |
| Weight | 26g |
Product feature and application
Core Product Features
Detects CNG, LPG, natural gas, butane, gasoline vapor, and other flammable gases in vehicle fuel systems
Fast response within 10 seconds for timely leakage warning
High detection accuracy up to ±10% LEL
Adjustable alarm threshold from 5% to 25% LEL
Supports analog 0-5V and PWM digital output signals
Wide operating voltage from DC 8V to 15V
IP54 protection for dusty and humid vehicle environments. It handles dust and splashes, but not direct high-pressure water
Compact size, easy to install in the engine bay or gas system area
Small and light: 78 × 29 × 28mm, 26g
Plug: DJ7041-1.5-21
Main Application Scenarios
Used in CNG and LPG converted vehicles to monitor gas concentration in the engine bay, gas pipeline area, or near the reducer and injector rail.
Suitable for:
New CNG / LPG conversion safety system installation
Replacement of faulty or insensitive leak alarms
Passenger cars, SUVs and light commercial vehicles
Retrofit workshops, auto repair shops and safety component suppliers
Product Details
The sensor monitors surrounding gas concentration in real time. When detected gas reaches the set alarm threshold, it outputs an alarm signal through analog or PWM signal.
It works with the vehicle autogas control system to help improve driving safety. Installation position should be close to possible leakage points, such as gas pipelines, reducer and injector rail connections.
Installation Tip: Install the sensor near possible leakage areas. Keep it away from direct water splash and strong vibration. Do not hide it behind a panel where gas cannot reach it. Professional installation and calibration are recommended. If you are not sure where to mount it, ask before you drill. A bad spot can make a good sensor useless.
Product Qualification & Strength Verification
Each gas leak alarm sensor is tested for detection accuracy, response time and output function before shipment. We focus on autogas safety components and provide reliable products for vehicle conversion systems.
We support wholesale supply and custom configuration according to customer requirements. If your market needs a different plug, output, or alarm setting, tell us. We will tell you what we can do.
Shipping, Delivery & After-sales Service
Stable Delivery Capacity
Equipped with standardized production and sufficient raw material reserves, we support sample testing, small-batch trials and large-batch bulk orders. We keep delivery stable and on time for CNG/LPG conversion projects.
Diversified Shipping Methods
We support international express, sea freight, air freight and other diversified logistics methods. We match the shipping method to your order quantity and destination country. The goal is simple: safe and fast delivery.
Professional After-sales Support
We provide one-stop pre-sales matching consultation and after-sales technical service. Our team can help with installation guidance, wiring, mounting position and fault troubleshooting. For production-related quality issues, we provide reliable after-sales solutions to keep your conversion equipment running. We can share product specs and test info, but we cannot give legal advice. Rules for CNG/LPG safety parts vary by country and region, so check your local rules.
FAQ
Q1: Which gases can this sensor detect?
A: It can detect CNG, LPG, natural gas, liquefied petroleum gas, butane, gasoline vapor and other flammable gases.
Q2: How fast is the alarm response?
A: The response time is ≤10 seconds.
Q3: What output signals does it support?
A: It supports analog signal 0-5V and PWM digital signal.
Q4: Is the alarm threshold adjustable?
A: Yes, the alarm concentration can be adjusted between 5% and 25% LEL.
Q5: What is the operating voltage?
A: DC 8V to 15V.
Q6: Can it be installed in the engine bay?
A: Yes, it is suitable for engine bay installation with IP54 protection.
Q7: Is professional installation required?
A: Yes, professional installation and calibration by qualified technicians are recommended.
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