Which of the following distances is not a valid placement distance for an ultraviolet scanner relative to the flame?

Prepare for the HVAC D-2 License Exam. Study with flashcards and multiple-choice questions. Each question comes with hints and explanations. Get ready for your HVAC certification!

Multiple Choice

Which of the following distances is not a valid placement distance for an ultraviolet scanner relative to the flame?

Explanation:
Ultraviolet flame scanners must be placed within a specific distance from the flame so the sensor receives a strong, recognizable UV signal quickly. As distance increases, the UV energy reaching the detector drops, and the sensor’s ability to detect the flame reliably diminishes. Beyond the maximum recommended distance, the flame may not be detected promptly, increasing the risk of unsafe conditions. That’s why distances like 6, 12, and 18 inches are typically within the acceptable range, while 24 inches is beyond the practical limit for reliable detection, making it an invalid placement distance.

Ultraviolet flame scanners must be placed within a specific distance from the flame so the sensor receives a strong, recognizable UV signal quickly. As distance increases, the UV energy reaching the detector drops, and the sensor’s ability to detect the flame reliably diminishes. Beyond the maximum recommended distance, the flame may not be detected promptly, increasing the risk of unsafe conditions.

That’s why distances like 6, 12, and 18 inches are typically within the acceptable range, while 24 inches is beyond the practical limit for reliable detection, making it an invalid placement distance.

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