# How do I know what gauge my vacuum is?

How do I know what gauge my vacuum is?

## How do I know what gauge my vacuum is?

Doing The Vacuum Test:

1. Connect the vacuum gauge hose, as close to the intake manifold as possible and start the engine.
2. Run the engine long enough, to reach normal operating temperature.
3. Note: the location and action, of the vacuum gauge needle.

What gauge measures high vacuum?

For high vacuum, from 10-3 Torr to 10-6 Torr, either cold cathode or Bayard-Alpert hot cathode gauges are used. Both require frequent calibration. For ultra-high vacuum, below 10-6 Torr, cold cathode or Bayard-Alpert hot cathode gauges are also used.

### What is VAC in Hg gauge?

In the U.S., the common standard to measure rough vacuum is inches of mercury (“Hg), which can be measured in two different ways. One method is as “Hg gauge (“HgV), where the scale starts at 0″ Hg (atmospheric pressure) and goes up to 29.92” Hg, which is perfect vacuum.

What range on a vacuum gauge is ideal?

between 17 and 22 inches
This a normal reading—between 17 and 22 inches of mercury. Keep in mind, this reading is ideal for stock-cammed engines running at sea level. Higher elevations may cause slightly lower readings. For every 1,000 feet above sea level, you can expect the reading to be about one inch lower.

#### What is vacuum scale?

Torr as units of measure are typically used for vacuums in the 1 to 760 Torr range. For measurements of vacuum on an even smaller scale, the “micron” is the term of use. One micron is equal to 0 . 001 Torr (10-3 Torr).

What does 5 Pa vacuum mean?

Vacuum level of 5 Pa All pressures below atmospheric pressure are considered vacuum. 101,325 Pa is 1 standard atmosphere. Therefore 5 Pa would be ~ 0.005% of atmosphere, so small in comparison to the total vacuum range. However vacuum can be referenced to atmospheric pressure or a perfect vacuum.

## How should the vacuum gauge be connected to the system?

Micron gauges (electronic vacuum gauges) should be connected directly to the system – not at the pump – to check the vacuum at the system. Use a Vacuum/Charge valve (18975, 18990 or similar) to put the sensor directly on system port.