INFICON HAPSITE ER Chemical Identification System - Manual (Page 453)

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HAPSITE ER Operating Manual
Chapter 15
Service Module
15.1 Introduction
The Service Module (also called the SM) provides several support functions for the
HAPSITE. The Service Module contains pumps that create vacuum for the
HAPSITE manifold, both during GC/MS operation in the lab and NEG Pump
activation. This vacuum system comprises a Service Module Manifold, two vacuum
pumps in series connected by a foreline, a Manifold Vent Valve, Foreline Vent
Valve, and controllers to operate and monitor the pumping operations. The Vacuum
Interconnect Valve is physically opened and closed from the Service Module.
A 24 V(dc) power supply in the Service Module provides the HAPSITE with power.
The Service Module also contains backup batteries to provide a controlled
shutdown of the Service Module if power is lost.
The Service Module operates using two separate, but connected, pumps These
pumps are called the Roughing Pump and Turbo Pump.
The Roughing Pump has a two or four stage design, depending on the version. The
newer version of the Roughing Pump has four stages. Each stage of the Roughing
Pump has a rubber diaphragm which is pushed against a smooth plate several
times a second in order to remove air through small holes in the plate. The
Roughing Pump is sometimes referred to as a Diaphragm Pump.
The Roughing Pump works in series with the Turbo Pump to create a vacuum
(typically about 1 e
-03
to 3 e
-03
Pa pressure) which is suitable for operating the
HAPSITE Mass Spectrometer.
The Turbo Pump has a set of precision balanced blades which rotate at
approximately 1,500 Hz (1,500 revolutions/second) or 90,000 RPM.
CAUTION
Due to the rotational speed the blades, the Service
Module should not be moved while it is operating.