| Conventional
manifold gauge sets used to service and test auto A/C systems include a low
pressure 'compound' gauge. It's called a compound gauge because it provides
a pressure reading as well as a vacuum reading. When you take a close look
at the gauge, it's easy to see that the 'level' of vacuum is really not that
accurate... no matter how much you spend on the gauge set. |
| Can
you rely on your low side manifold gauge? |
 |
This
is a close up look at the vacuum scale of a conventional low side manifold
gauge. We've added the 'red lines' to show just how difficult it really is
to tell what level of vacuum you're reaching.
The
scale on the gauge has a green line for every 2" of vacuum. When you compare
that to the thickness of the needle, it's easy to see that the needle itself
is at least the same thickness as 1" of vacuum. In short, you can't rely
on the compound gauge for accurate vacuum tests. It's better detailed
in the micron vacuum chart below. |
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| A
close up look at 'micron' vacuum readings |
| Reviewing
the chart below, we can quickly see that using the manifold gauge for
an accurate vacuum reading is simply not reliable. Consider that 29.14" of
vacuum (as shown on your manifold gauge) would only be 20,000 microns. 29.89"
of vacuum would be 750 microns. With a conventional manifold gauge only,
you simply can not see the difference. After all, the gauge needle itself
is as thick as 1" of vacuum!
Using
the micron vacuum gauge for our tests allowed us to clearly see how each
vacuum pump performed before and after the vacuum pump service. |
%
Vacuum (Percent) |
Microns
|
Inches
Mercury Gauge |
0 |
760,000 |
0 |
97.4 |
20,000 |
29.14" |
98.7 |
10,000 |
29.53" |
99 |
7,600 |
29.62" |
99.9 |
1,000 |
29.88" |
99.9 |
750 |
29.89" |
99.99 |
100 |
29.916" |
99.999 |
10 |
29.9196" |
100 |
0 |
29.92" |
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| Vacuum
Pump Service Kit : |
 |
Polymax
Vacuum Pump Service Kit; 32oz Cleaner/Conditioner; 32oz. Vacuum Pump Oil;
4oz Anti Friction Additive - AR 4477
NEW!!
Now it's easy to get the maximum performance from your vacuum pump! The Polymax
Vacuum Pump service kit provides a cleaner and anti friction additive that
provides the 'lowest micron' formula!
$24.95
each Kit -
DETAILS
Add
to Cart |
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| Manifold
Gauges: |
| Conventional
manifold gauges are the minimum requirement that you need to check, service
or recharge and auto A/C system. We're proud to offer quality professional
A/C gauge sets at the COOL ZONE On-line A/C Warehouse. Feel free to review
the details of these gauge sets, couplers and hoses. |
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Gauge
Set
AR 6245
All
brass manifold includes sight glass; metal hand wheels; hook to hang up gauges.
Hoses not included.
See details. |
Gauge
Set
AR 6239
Aluminum
manifold with site glass; front mounted on/off valves; hoses not included.
See details. |
Gauge
Set
AR 6246
Excellent
value for the Professional on the go or the DIY'er! Complete set includes
GAUGES, HOSE SET and R-134a COUPLERS plus rigid storage case!
See details. |
Gauge
Sets for R-134A
Professional
quality hose sets for R-134a gauge sets. Available in 3 lengths; see details.
Fits all R-134a hose sets.
See details. |
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All
gauge sets at the COOL ZONE include
calibration screw and low pressure gauge with 'retard'! |
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R-134a
Couplers
AR 6247
90°
chrome coupler set; manual 'open' and 'close'. Fits all R-134a hose sets.
See details. |
R-134a
Couplers
AR 6235
90°
all brass coupler set; Quick connect couplers snap onto charge ports. Fits
all R-134a hose sets.
See details. |
Couplers
- Converts R-12 hose set to R-134a
AR 6248
Chrome
coupler set; manual 'open' and 'close'. Fits all R-134a hose sets.
See details. |
Gauge
Set
AR6245
All
brass manifold includes sight glass; metal hand wheels; hook to hang up gauges.
Hoses not included.
See details. |
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How
can you prevent this from happening?
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Jump
to other Fast Track
Auto Air Conditioning information |
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