Why is frequent calibration important for a magnehelic gauge?

Frequent calibration of a magnehelic gauge is vital primarily because it is sensitive to physical abuse and contaminants. Over time and with use, factors such as dust, moisture, and mechanical stress can lead to inaccuracies in the gauge's measurements. By frequently calibrating the gauge, you ensure that it maintains its sensitivity and accuracy, thereby providing reliable readings. This is essential in applications where precise pressure measurements are critical for proper operation and safety.

Other factors, such as preventing overheating, ensuring equipment longevity, or affecting display brightness, do not directly relate to the specific function and monitoring effectiveness of a magnehelic gauge. Calibration focuses primarily on maintaining the gauge's performance and accuracy, making it an important practice in any operational context where the gauge is employed.