: Once warm-up completes, the device sounds a brief tone, the yellow light shuts off, and the digital display shows a solid "0" . Only the green power light remains illuminated.
Do not paint over the alarm, as this can clog the sensor vents. What to Do During an Alarm: If the alarm sounds: Immediately extinguish all open flames. Shut off the main gas valve. Open windows and doors to ventilate.
| Parameter | Specification | | :--- | :--- | | | BRJ‑502 / BRJ‑502AD / BRJ‑502D | | Detection Gases | Natural gas (methane), LPG (propane/butane), coal gas, and other combustible gases | | Power Supply | AC 100 V – 240 V, 50/60 Hz | | Rated Power | < 2 W (BRJ‑502AD) / < 4 W (BRJ‑502D) | | Alarm Concentration | 3 %LEL – 20 %LEL (Lower Explosive Limit) | | Alarm Loudness | ≥ 85 dB | | Working Temperature | -10 °C to +50 °C (14 °F to 122 °F) | | Working Humidity | < 97 % RH (non‑condensing) | | Dimensions | Approximately 120 mm × 70 mm × 30 mm (4.7 in × 2.8 in × 1.2 in) | | Weight | Approximately 100 g (3.5 oz) | | Material | ABS + electronic components | | Certifications | Not certified for official gas‑service use; intended for personal household safety only |
Yes, the unit is rated for and will work worldwide with a simple plug adapter. However, if you need a model with a US plug, look for the optional US‑plug version when purchasing. Brj-502 Manual
Proper placement is critical for the effectiveness of the BRJ-502, as different gases have different densities relative to air. A. Placement Location
Regular maintenance ensures the reliability of your gas detector.
A: On models with an LED display (BRJ-502D, BRJ-502AD), you'll see a digital number ranging from 1 to 9 . The higher the number, the greater the gas concentration. When the concentration is very low or zero, it will show a low number or 0. : Once warm-up completes, the device sounds a
Solution: Check probe connections for breaks. Verify that the menu parameter matches your exact sensor type (e.g., K-type vs. Pt100). Temperature Moves in the Opposite Direction Cause: Thermocouple polarity reversed.
Cause: Sensor input open-circuit, broken wire, or incorrect sensor type selected.
A: Allow approximately 2 to 3 minutes after first plugging it in for the sensor to stabilize and begin accurate detection. What to Do During an Alarm: If the
The display usually shows "0" or "—", indicating no gas is detected.
A: With regular testing and cleaning, a typical home gas detector has a sensor lifespan of 5 to 7 years. After this period, the sensor's sensitivity may degrade. It is recommended to replace the entire unit after this time, even if it seems to be working.
Once installed and warmed up, the BRJ-502 operates automatically.
The alarm will continue sounding until the surrounding gas concentration falls below the alarm point. Maintenance and Testing