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SR-902-2 433MHz Wireless Gas Detector with Valve Linkage
SR-902-2 wireless gas detector with 433MHz valve linkage, 10% LEL alarm threshold, digital display, and IP65 housing for compatible gas detection and shut-off applications.
A wireless gas detector helps detect combustible gas leaks and alerts people before gas reaches dangerous levels. The SUMRING SR-902-2 combines gas detection, audible and visual alarms, and 433MHz wireless communication for compatible gas shut-off devices.
The SR-902-2 detects specified combustible gases, including natural gas, methane, propane, butane, and LPG. It features a digital display, a 10% LEL alarm threshold, and an IP65-rated enclosure. Its fixed wall-mounted design supports gas detection projects that require local alarms and external valve linkage.
For B2B buyers, the SR-902-2 offers a practical option for projects requiring 433MHz gas alarm communication. SUMRING supports product selection discussions for distributors, contractors, system integrators, and OEM or ODM customers.
What Are the Main Features of This Wireless Gas Detector?
1. 433MHz Wireless Valve Linkage
The 433MHz wireless gas detector supports communication with compatible gas shut-off manipulators. When an alarm occurs, a paired receiving device can trigger the external gas shut-off mechanism.
This function helps combine local gas warnings with gas supply control. Buyers should confirm the wireless protocol, receiver model, and pairing compatibility before ordering.
2. Combustible Gas Detection
The SR-902-2 wireless gas detector uses a planar semiconductor sensor and diffusion-based detection technology. It is specified for detecting natural gas, methane, propane, butane, and LPG. Its alarm threshold is 10% LEL, while the published measurement range is 0–100% LEL.
3. Audible and Visual Gas Alarm
The wireless gas detector features an audible alarm, flashing warning lights, and a digital gas concentration display. These functions help users recognize alarm conditions and monitor the detector’s reported operating status.
Status indicators help users identify normal operation, alarm conditions, and reported faults. These features make alarm information easier to recognize during routine monitoring.
4. IP65 Flame-Retardant Housing
The SR-902-2 wireless gas detector features a flame-retardant ABS enclosure with an IP65 protection rating. The housing is designed for fixed wall-mounted installation. IP65 protection does not establish explosion-proof certification or approval for hazardous locations.
Its enclosure provides protection against dust and water ingress under the relevant rating conditions. However, IP65 does not mean the detector is explosion-proof. Installation suitability must be checked for each project.
5. Manual Reset Function
The detector includes a manual reset button. This feature supports the product’s specified reset operation after an alarm or other relevant condition.
Before any system reset, qualified personnel should confirm that the alarm cause has been resolved and the area is safe.
6. Fixed Wall-Mounted Installation
The detector is designed for fixed wall mounting and uses a specified AC 220V power supply.
Installation requirements depend on the target gas, local safety rules, power supply, and connected devices. A qualified installer should verify the final system design.
SR-902-2 Technical Specifications
The following table summarizes the published specifications of the SR-902-2 wireless gas detector. Buyers can use these values for an initial product comparison. Final project approval should use the latest technical manual and applicable test documents.
| Parameter | Specification | Parameter | Specification |
|---|---|---|---|
| Model Number | SR-902-2 | Wireless Frequency | 433 MHz |
| Detection Principle | Planar Semiconductor Type | Detection Method | Diffusion Type |
| Target Gases | Natural Gas (Methane), Propane, Butane, LPG | Alarm Threshold | 10% LEL |
| Measurement Range | 0–100% LEL | Measurement Accuracy | ±3% F.S. |
| Operating Voltage | AC 220V | Operating Current | Less than 0.3 A |
| Housing Material | Flame-retardant ABS | IP Rating | IP65 |
| Mounting Type | Fixed Wall-Mounted Installation | Reset Function | Manual Reset Button |
| Operating Environment | -10°C to +55°C; Below 95% RH (Non-condensing) | Storage Temperature | -20°C to +50°C |
| Specified Sensor Lifespan | At Least 3 Years | Referenced Standard | GB/T 34004-2017 |
| Product Dimensions | 153.5 × 153.7 × 57 mm | ||
Technical Note: The values above reflect the published product information. Confirm the power supply range, measurement accuracy, sensor service conditions, and any claimed standard conformity against the latest approved documentation.
How Does the SR-902-2 Wireless Gas Detector Work?
The SR-902-2 wireless gas detector monitors the surrounding air for specified combustible gases. When the detected concentration reaches the preset alarm threshold, the device activates its audible and visual warnings. In a compatible 433MHz system, it can also transmit an alarm signal to an external gas shut-off device.
When a compatible shut-off device is paired with the detector, 433MHz wireless communication can also support automatic gas supply isolation.
Step 1: Gas Detection
The semiconductor sensor monitors the air through diffusion-based gas detection. The detector measures the gas response according to its specified sensing design.
Step 2: Alarm Activation
When the detected concentration reaches the preset 10% LEL alarm threshold, the detector activates its audible and visual warning functions.
Step 3: Wireless Signal Transmission
In a compatible 433MHz system, the detector sends a wireless alarm signal to the paired valve controller or gas shut-off manipulator.
Step 4: Gas Supply Shut-Off
The external shut-off device responds to the valid alarm signal and initiates its designed closing action. The actual response depends on the selected valve, receiver, and system configuration.
Step 5: Safety Check and Reset
After an alarm, the gas installation must be checked by qualified personnel. The system should only be reset after the leak source has been addressed and safe conditions have been confirmed.
Important: The detector provides gas detection and alarm functions. The external valve or manipulator performs the shut-off action. Both devices must be compatible.
Learn more about system design in our guide: How Does a Gas Detector Work With a Solenoid Valve?
Where Can the SR-902-2 Be Used?
The SR-902-2 may be considered for suitable natural gas and LPG detection applications, including small catering kitchens and other permitted gas-use areas.
For every project, buyers must verify the target gas, detector location, power supply, and installation requirements. Commercial installations may require additional approvals under local regulations.
For B2B purchasing, the most important point is system compatibility. A detector and a shut-off valve must work together as a complete safety system.
Before requesting a quotation, confirm the required gas type, operating voltage, valve controller, 433MHz communication protocol, and destination market.
FAQs
1. What gases can the SR-902-2 detect?
The published specifications list natural gas, methane, propane, butane, and LPG. Buyers should confirm the required gas calibration and application before selecting the detector.
2. Can the SR-902-2 control a gas shut-off valve?
Yes. The product supports linkage with compatible gas shut-off manipulators. Its published information describes wired and 433MHz wireless linkage options. Buyers should confirm the available output configuration and receiving device.
3. Can any 433MHz valve controller work with this detector?
No. Matching the frequency alone does not guarantee compatibility. Both devices must use compatible communication protocols and control methods. Confirm the receiver model before ordering.
4. What is the alarm threshold of the SR-902-2?
The SR-902-2 wireless gas detector has a specified alarm threshold of 10% LEL. LEL stands for Lower Explosive Limit, which refers to the minimum concentration of a combustible gas or vapor in air that can ignite in the presence of an ignition source.
For a technical explanation of LEL terminology, refer to the U.S. Occupational Safety and Health Administration (OSHA).
The alarm threshold and suitability for the target gas should be confirmed against the product’s technical specifications.
5. Does the SR-902-2 work during a power outage?
The current product information specifies AC 220V operation without a built-in backup battery. The detector should not be assumed to continue monitoring when mains power is unavailable.
6. Is the SR-902-2 explosion-proof because it has an IP65 rating?
No. IP65 describes protection against dust and water ingress. It does not establish explosion-proof certification or approval for hazardous locations.
7. Does the detector require regular maintenance?
Yes. Gas detectors require inspection, functional checks, and maintenance according to the manufacturer’s instructions. Sensor condition and calibration requirements should be reviewed during the product’s service life.
8. Is the gas shut-off valve included with the detector?
Valve compatibility does not mean the valve is included in every package. Buyers should confirm the packing list, compatible valve model, accessories, and complete system quotation with SUMRING.
Looking for a Gas Detector with Valve Linkage?
SUMRING supplies gas detection products for distributors, importers, contractors, and OEM or ODM customers.
For other gas detection requirements, you can also explore the SR-918 LPG Gas Alarm or the SR-915 WiFi Gas Detector.These models offer different features and communication options.
To discuss the SR-902-2, please provide your target gas, destination country, required quantity, operating voltage, and valve linkage requirements.
Contact SUMRING for product specifications, compatible accessory information, and an OEM or ODM quotation.