Manual 2003 Rev D p/n 2003
9
04
Description
Specially ordered boosters with nonstandard
construction, or with rotor end clearances
greater than shown within the
“Assembly
Clearances” on page 31, will not have the
operating limits specified here. Contact your
Tuthill Vacuum & Blower Systems sales
representative for specific information.
Pay special attention when a vacuum booster
has a higher than standard ambient suction
temperature. Special recommendations
for operating parameters and/or additional
cooling may be recommended. Consult the
factory or local representative for appropriate
information.
Deep vacuum requires instrumentation much
more sensitive than standard thermometers and
mercury-type pressure or vacuum gauges. At
operation pressures less than 100 Torr (mmHg),
use low-deadband cut-in switches and low-mass
thermocouples, positioned so the sensor is
connected to the inlet and discharge connections of
the vacuum booster. NPT connections are provided
at each of the inlet and discharge ports for this
purpose. Standard temperature switches, because
of their higher mass, do not have reaction times
fast enough to adequately protect the vacuum
booster. Likewise, standard vacuum switches are
not recommended for cut-in switches, as vacuum
boosting typically requires a very accurate cut-in
point. A tachometer will enable periodic checks of
operating speed.
