REFCO VG-64 User Manual

VG-64

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7640126 683775

DIGITAL VACUUM GAUGE

FEATURES

• Ultra fine resolution (as low as 1 Micron)

• ½ second response time

• Auto shut off

• Convenient built in hanger

• Easy access cleaning port

SPECIFICATIONS

Sensor Type Thermistor
Connector Type Standard ¼ inch male flare fitting.
Vacuum Range 0 – 12,000 Microns (0 – 1,600

Pascals) with vacuum increasing/
decreasing indicator when above
12,000 Microns

Scale Microns, PSI, InHg, milliBars, Pascals,

Torr, milliTorr

Resolution 0-200: 1 Micron

201-500: 5 Microns
501-1,000: 10 Microns
1,001-2,000: 50 Microns
2,001-5,000: 250 Microns
5,001-8,000: 500 Microns

8,001-12,000: 1,000 Microns
Operating 35°F to 125°F ( 2°C to 52°C)
Temp.Range
Overpressure 500 PSI maximum
Accuracy +/-10% (100 to 1000 microns)
Power Source 9 Volt Alkaline Battery
Battery Life Over 35 Hours
Auto Shutoff After 10 minutes when vacuum reading

is above 12,000 Microns (12 Torr)
Weight 6.7 ounces
Dimensions 5½²H X 3²W X 1¼²D

Refrigeration
Service Products
and Components

HVAC/R

Service Products

Digital Vacuum Gauge

Vakuummessgerät
Vacuomètre

VG-64

4503171

HVAC/R

Service Products

VG-64

4503171

REFCO Manufacturing Ltd.

CH-6285 Hitzkirch (Switzerland)
Telefon [phone]

OPERATING CONTROLS

• Turning the vacuum gauge ON: Press and hold the ON
button for approximately 3 seconds, until the display
appears.

• Turning the vacuum gauge OFF: Press the OFF button. To
prolong battery life, when vacuum reading is above
12,000 Microns for approximately 10 minutes, the VG­64 will automatically turn OFF.

CONNECTING THE

VG-64

VG-64 TO THE
VACUUM SYSTEM

The VG-64 should be
connected to the
vacuum system at
the vacuum port.
The "Auxiliary Port"
is primarily for cleaning
And should normally be
closed with the supplied cap. It is possible to connect the VG-64 in-line, however
it may restrict flow and increase the evacuation time.

• Changing the scale: Press the Scale button to change
the display to the next scale. The scale order is:
Microns, PSI, Inches of mercury (InHg), milliBars,
Pascals, Torr and milliTorr. The VG-64 will keep the scale
settings even if the power is turned OFF.

UNDERSTANDING THE DISPLAY

• When the vacuum reading is above 12,000 Microns

(1,600 Pascals), the first line of the display shows "Atm."
The second line displays a bar graph to indicate the
direction in which the vacuum is moving. When the bar
graph is moving from left to right, the pressure is
increasing. When the bar graph is moving from right to
left, the pressure is decreasing. The speed of the bar
graph indicates how fast the pressure is increasing or
decreasing. The bar graph indicator may be inaccurate
for a few seconds after the evacuation of the system has
begun.

• The bar graph disappears if the vacuum does not change
for approximately 10 seconds.

• When the vacuum reading is below 12,000 Microns
(1,600 Pascals), the vacuum in the selected units is
displayed.

CLEANING THE VG-64 VACUUM SENSOR

It is recommended that the VG-64 sensor be cleaned periodically to
maintain unit accuracy. Oil and other contaminants reduce the
accuracy of the VG-64 unit. Follow the instructions below for
cleaning.

• Close the vacuum port with the supplied cap. Open the auxiliary
port.

• Use an eyedropper to pour approximately 2 teaspoons of
ordinary rubbing alcohol into the auxiliary port.

• Close the auxiliary por t with the supplied cap. Both the vacuum
and auxiliary por ts should now be closed.

• Shake the VG-64 unit for approximately 10 seconds. A slight
movement of the vacuum sensor in the case is normal and does
not affect the internal connection in any way.

• Open both the vacuum and the auxiliary ports. Empty the alcohol
and air dry the sensor.

• Close both the vacuum and the auxiliary ports with the supplied
caps when the VG-64 is not used. This prevents contamination of
the sensor.

CHECKING HVAC SYSTEMS FOR LEAKS

When checking a system for leaks use only copper tubing and a
vacuum proof valve. Generally standard hoses will not hold a
vacuum. If using the blank-off valve on the vacuum pump check it
for leaks periodically. At the beginning of the test the VG-64 reading
may increase due to a system equalization. The vacuum reading
should hold after a minimum of 5 minutes. If the reading continues
to increase it may indicate a leak in the system.