Blog Về How to choose the application scenario for R2868 flame sensor?

One:  What application scenarios is R2868 suitable for?

1. The key to selecting R2868 flame sensors is not simply to see if they can detect flames, but to choose application scenarios based on flame type, installation distance, ambient light interference, response speed, and whether it is necessary to determine the true combustion state.
2. If you are referring to Hamamatsu's R2868 ultraviolet flame sensor, it belongs to the ultraviolet discharge tube type sensor and mainly uses specific wavelength ultraviolet rays generated by flames for detection. It works differently from ordinary infrared flame sensors and flame detection modules, so there are several particularly important limitations when selecting the scene.

Two : Which scenarios are not suitable for using R2868 directly?

    1. Detecting cigarettes, mosquito coils, and other items that do not burn with an open flame: Not suitable because without an open flame, the required ultraviolet signal is usually lacking.

    2. Measuring flame temperature or accurately determining flame size: Not suitable for standalone use, requiring other optical or temperature measurement schemes.

    3. Monitoring a large area: The coverage distance cannot be determined solely by the sensor model, but should verify the flame type, installation angle, occlusion, and actual detection distance.

   4. In environments with ultraviolet lamps, welding arc lights, or other strong ultraviolet sources: the risk of accidental triggering should be assessed and on-site testing should be conducted.

   5. Combustion control or fire protection systems that require safety certification: The safety certification of the entire detection and control system must be verified, and individual sensors cannot be considered as complete safety devices.

Three:  What are the most noteworthy product features of R2868?

   1. Strong UV selectivity and day blindness characteristics:

It is only sensitive to ultraviolet light in the wavelength range of approximately 185-260 nm and is not directly affected by visible light. It is suitable for detecting flames or discharges in ordinary lighting environments.

   2. High sensitivity and fast response:

The typical sensitivity is 5000 times/minute, and the minimum quenching time is 2 ms. The actual response time of the system also depends on the driving circuit, signal processing, and judgment logic.

   3. Side photosensitive structure, suitable for specific installation layouts:

R2868 is a side on structure suitable for devices that require receiving ultraviolet signals from the side. When designing, the installation position should be arranged according to the direction of the photosensitive window.

  4. Wide working temperature range:

The rated working temperature range is -40 to+125 ° C, suitable for various industrial environments, but continuous operation at high temperatures may shorten the lifespan.

 5. Small size, easy to integrate:

Weighing approximately 1.5 grams, it is suitable for embedded devices, burner monitoring equipment, and industrial detection devices. Additional design or configuration of high-voltage drive and pulse signal processing circuits is required.

 6. Expected lifespan of approximately 25000 hours:

This is the expected lifespan when discharging continuously under specified working conditions, and not all environments can guarantee the desired usage duration.

Four  :To summarize in one sentence:

1. The core advantage of R2868 is the use of 185-260 nm ultraviolet light for flame or discharge detection, which has day blind characteristics, fast response, small size, and wide working temperature range.

2. If you are doing product development, there are two things to pay special attention to when selecting:

3. If the goal is gas ignition and extinguishing detection, focus on verifying the UV signal strength of the actual flame and the reliability of extinguishing recognition.

4. If the target is long-range flame detection, R2868 may not be the optimal model. Hamamatsu officially positions it as a slender side model, and for long-distance applications, it should be compared to models with higher sensitivity such as R14388.