INFICON HAPSITE Smart Plus Chemical Identification System - Manual (Page 477)

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HAPSITE Smart Plus Operating Manual
15.3 Components of the Service Module
The following section describes the components of both Service Module models.
15.3.1 Backup Batteries
NOTE: The Service Module contains two 12 V(dc) (24 V(dc) total) lead-acid gel
cells that will safely shut down the Service Module when power is lost. This
includes closing the Vacuum Interconnect Valve (if necessary), venting the
Service Module manifold, and a controlled shutdown of the electronics.
This procedure takes about 30 seconds, during which the POWER
indicator on the Service Module display will remain illuminated.
CAUTION
When power is regained after a loss, all operations that
were interrupted must be restarted by the user.
When the Service Module is turned off by the user, the
Service Module will undergo the same controlled
shutdown procedure.
NOTE: Backup batteries are kept charged whenever the Service Module is
powered.
15.3.2 MDP/Turbo Pump
The Molecular Dispersion Pump (MDP), also known as MDP/Turbo Pump,
provides high vacuum to the HAPSITE Manifold. The top speed is 1500 Hertz
(90,000 RPM). This is controlled by the MDP/Turbo Pump controller, which is
controlled by the Service Module Processor. The pump is lubricated with special
vacuum pump oil at its base. Over-temperature protection is built into the pump.
15.3.3 Manifold Vent Valve
The Manifold Vent Valve is located in the middle of the MDP/Turbo Pump. The
Manifold Vent Valve is the main vent for the Service Module vacuum system.
Normally, the Manifold Vent Valve will vent the Service Module to atmosphere. If it
is desired to vent the vacuum system to another gas (dry nitrogen for example), this
can be done by connecting the gas supply to the Service Module at the port marked
VENT. This port accepts an 1/8” OD tube. The maximum gas pressure at this vent
should be 10 psig (25 psia).