A gas leak detector is an early warning detection device for LPG or CNG gas leakage from cylinders or through pipelines. Gas detection is done by diffusion.
A sensitive nose can sense the smell at a much lower ppm level of gas, which could be as low as 500 ppm. The LPG detector is calibrated to give the alarm at about 2,000 ppm to avoid unnecessary false alarms. This level is sufficient for early warning because LPG becomes explosive only after 20,000 ppm, which is 10 times the concentration at which the detector sounds an alarm.
This wall-mount unit is compact and designed for low-cost domestic as well as commercial applications such as hotel kitchens.
Salient Features: Gas Leak Detector for LPG and CNG
- Detects gases ( LPG, CNG, Natural gas.)
- Gas is detected when LPG concentration exceeds 10%-15% of LEL (2,000-3,000 ppm) in the given volume. LEL for LPG is 20,000 ppm.
- Potential free relay contacts for alarm output.
- Semiconductor type sensor.
Technical Specifications Gas Leak Detector
| Power Supply | 230V, AC 50Hz |
| Power Consumption | 4W |
| LED Indication | Gas Leak & Heat Detection Gas: Red LED Heat: Yellow LED |
| Alarm Type | Audible buzzer alarm |
| Output | PFC Relay O/P up to 2A contact rating |
| Dimensions | (111 x 90 x 40) mm (LxHxW) |
| Operating Temperature | -10°C to 70°C |
Installation Procedure: Gas Leak Detector for LPG and CNG
Pre-installation Checklist
Ensure that you have the following items with Gas Leak Detector:
- Unit with power cord
- Test gas bottle (lighter)
- User manual
Identifying the Place for the Gas Leak Detector on the premises
Fig. 1: For LPG Detection
Note: LPG is heavier than air. It tends to settle down. Hence, when you are using an LPG cylinder, the Gas Leak Detector must be installed at 30 cm height above floor level.
Fig. 2: For CNG/PNG Detection
Note: Natural gas (LNG/PNG/CNG) is lighter than air. Hence when you are using it, the Gas Leak Detector must be installed 30cm below the ceiling.
Locations to be avoided for installing Gas Leak Detector
- Very near to exhaust fan
- By the side of a door or window
- Directly above the gas stove
- Places where water can splash onto the unit
- In an enclosed space: Many times, the LPG detector is mounted on the wall, behind the LPG cylinder, or under the kitchen platform with the door without a grill. This creates a confined space around the detector, and cylinder, regulator, and tube connecting it. In such cases, the detector effectively detects LPG leaks occurring only in this confined space.
Fixing the LPG Detector
LPG Detector has a unique enclosure design. After selecting the right location, fix the unit on the wall with the wall mounting plugs and screws provided with the unit. The unit can be installed as shown in Fig. 3. or Fig. 4.
1. It can be mounted on the front door of the kitchen cabinet of the LPG Cylinder. This will enable the detection of gas leaks from the cylinder as well as the gas stove. Refer to the following diagram (Fig. 3).
Fig. 3: Mounting Gas Leak Detector on the Front Door of the Kitchen Cabinet
Note: If the LPG Detector is mounted on the door as shown above, the power supply wire should be properly routed so that it does not get pinched in the hinges while closing the door.
2. If it is mounted behind the gas cylinder, the cabinet for the gas must have grills to detect gas leaks from the gas stove. Refer to the following diagram (Fig. 4).
Fig. 4: Mounting Gas Leak Detector behind the gas cylinder
Note: When there is a leak from the gas stove because of a faulty connection to the tube or by leaving the gas burner ON accidentally without a flame, the LPG may not reach the confined area near the cylinder where an LPG Detector and LPG sensor are installed. To avoid this, install the unit as shown in Fig. 3 or Fig. 4.
Color Code for Wire Connection
Supply Voltage Connections
| Supply Voltage | Wire Colour | Connection to |
| 230VAC | 2-pin plug with power cord | 5A socket |
| +12VDC | DC power -ve | DC power +ve |
| Ground | Black wire | DC power -ve |
Relay Connections
| Relay Output | Wire Colour |
| NO | Yellow |
| NC | Blue |
| Common | Brown |
Operation Gas Leak Detector for LPG and CNG
Warm-up period:
When the LPG Detector is powered ON, it enters the warm-up period for approximately one minute. Gas Leak and Heat LED flash rapidly and simultaneously during the warm-up period.
Sense Mode:
Once the warm-up period is over, the detector enters into ‘Sense’ mode. During this mode, Gas Leak and Heat LED flash alternately.
During Sense mode, the LPG Detector measures the gas level in the environment and gives a visual indication. When a gas leak is detected at 10% LEL, the system gives a visual indication and an audible alarm. The Gas Leak LED turns ON and an audible buzzer remains ON. Once the gas is dispersed, the alarms get reset.
During Sense mode, the LPG Detector measures the ambient temperature and gives a visual indication. When the temperature above 60oC is detected, the Heat LED turns ON and an audible buzzer remains ON.
The relay output is used to trigger any external device such as a siren or a dialer. Relay operates in an alarm state and resets when the alarm stops.
Routine Check for LPG Detector
To ensure that the LPG Detector is in working condition, it is necessary to perform a regular check as to whether the Sensor ON LED is glowing.
To check that the unit has not lost its sensing capability, it is necessary to check the unit once a month, by applying gas from the test bottle.
Do’s and Don’t- When Gas Leakage Occurs
Do’s:
1. If the gas leakage is severe, it is very dangerous for anybody to enter the premises. Call the Fire brigade / Gas dealer.
2. If there is a minor/moderate gas leakage- Turn off the knob, and regulator, to stop the gas supply.
3. In case of complaints or concerns, get in touch with the customer support team & register a complaint. An MRA would be issued that could be used to return the product in case of a manufacturing defect.
Don’t:
- Do not panic.
- Do not OFF / ON any electrical switch.
- Do not light any kind of fire or lamp.
Disclaimer for Gas Leak Detector
All statements, technical information, and recommendations contained herein are based on available scientific and technical know-how, which we believe are true and reliable.
However, neither the manufacturer nor the seller shall be liable for any loss, injury, earth, or damage direct or consequential arising out of the use of or the inability to use the product.
The purchaser and/or user shall determine the suitability of the product for his intended use and the user assumes all risk and liability, whatsoever, in connection therewith. No statement or recommendation contained herein shall have force or effect unless in an agreement signed by officers of the manufacturer or seller.
The seller’s and manufacturer’s only obligation shall be limited to replacing the product that is proven to have having manufacturing defect and returned within the warranty period.
I’m Abdus Sobur, a highly skilled and professional Fire Safety Officer with a passion for safeguarding lives and property. Over the course of my career, I’ve conducted numerous successful fire safety audits, earning a reputation for excellence in ensuring public safety.
In addition to my role as a Fire Safety Officer, I’m also dedicated to raising awareness about the importance of fire safety. Through my blog, I share insights into the functions of different fire safety equipment, aiming to empower individuals with the knowledge they need to protect themselves and their communities.
I’m driven by a deep commitment to promoting fire safety awareness and preventing fire-related incidents.