Chemglass AF-0304 - Manual (Page 5)

1.2. Vacuum Gauge Indicator
1.3. Portable Vacuum Gauge Indicator
The indicator instruments are rugged, digital vacuum
gauges. They are small, compact instruments that power
a Pirani-type gauge tube which senses changes in
pressure by measuring the thermal conductivity of the
residual gases in the vacuum system. The sensors are
made of an inert, noble metal that does not oxidize or
corrode. The long-term life expectancy for the gauge
tube is excellent if kept clean and free of oil or other
evaporated contaminates from the vacuum system.
Your instrument is ready to operate as received. Simply
install the gauge tube, connect the gauge tube cable,
and plug the line cord into an AC power outlet to place
the indicator in operation.
The instrument is powered from a 115 VAC or 230 VAC
line as specified when ordering. Power consumption is
about 1 Watt. Either 50 or 60 Hz power may be used.
A 10 foot long gauge tube cable is attached and exten-
sions up to 500 feet (if using #18 wire) may be added
without affecting calibration. See section on Cable
Extensions for more information.
The battery powered gauge is ready to operate as
received. The gauge displays a vacuum pressure reading
for approximately one minute each time the “ON” switch
is pressed. An automatic shut-off circuit turns the display
off in order to conserve battery life. The Tube Type
Selector Switch can be set for Pirani tubes, such as the
KJL or VRC D-2000; or alternatives for T/C tubes, such
as the KJL-6000 or Hastings DV6R. The battery gauge
reads vacuum in the range of 1 to 2000 mTorr with the
Pirani tubes, or 1 to 200 mTorr with the T/C tubes. Press
and hold in the “ON” button to check the charge level of
the battery. Recharge the battery anytime the reading on
the display drops below 960. The gauge can be charged
continuously when not in use.
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