Quick Tips &
Care Guide
Vacuum Gauge Placement
Vacuum Gauge Orientation
Connect the Vacuum Gauge to the system as far from the pump
as possible - For a system to be adequately dehydrated a deep
vacuum must be achieved throughout the entire system, not just
the point where the vacuum pump is connected. Unlike pressure,
vacuum will not quickly equalize across all points of the system.
For the most accurate reading of vacuum depth throughout the
system, connect the vacuum gauge at an access port on the
system that is farthest from the Vacuum Pump. It is possible for
one end of the system to be evacuated to 1,000 microns while
another end - far from the vacuum pump - can still be at 10,000
microns.
S
ys
te
m
Vacuum
Gauge
Access Port
Access Port
or
Side Port
Valve Core
Removal Tool
Service Tip:
Connect the gauge at the
valve core removal tool’s side port or
on a spare system port.
Service Tip:
On larger systems, multiple gauges may be used
simutaneously to measure vacuum depth in di�erent spots
for a more complete analysis.
A vacuum gauges’s ability to deliver accurate readings relies on a clean sensor. Accuracy of any vacuum gauge
can be a�ected by oil contamination, so it is important to minimize the chances of contamination during use.
Keep the Gauge Upright - During the evacuation process, oil from the system will migrate towards the vacuum
pump. As it passes the vacuum gauge connection port, gravity may cause the sensor to become flooded with
oil and produce inaccurate readings.
Vacuum
Gauge
S
ys
te
m
Vacuum
Gauge
S
ys
te
m
Always connect the AV760 so it remains upright throughout the evacuation.
©2020 Appion Inc. All Rights Reserved.
