Which of the following is appropriate when using an electronic vacuum gauge?
A. Ensuring a sustained vacuum of at least 500 microns while using the vacuum gauge
B. Installing the sensor horizontally to ensure contact with the system oil
C. Allowing the vacuum pump to draw a vacuum of 475 microns HG before opening the valve
D. Connecting the system directly to the sensor

When using an electronic vacuum gauge, allow the vacuum pump to reach 475 microns HG before opening the valve for accurate measurements. Avoid practices like connecting the system directly to the sensor without precaution, as this can damage the gauge and compromise accuracy. Proper installation and operational procedures are critical for reliable vacuum measurements. ;

Answered by GinnyAnswer | 2025-07-04

The most appropriate practice when using an electronic vacuum gauge is to allow the vacuum pump to draw a vacuum of 475 microns HG before opening the valve, ensuring proper system integrity. Connecting the system directly is also generally acceptable, but care must be taken to avoid any damage to the sensor. It's essential to avoid direct contact with oil and excessively high vacuum levels not suited for the system.
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Answered by Anonymous | 2025-07-20