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2. CONFIGURATION
OF
HELIOT
2-1 Overall
Configuration
(1) Basic
unit
The basic unit consists of a chassis section that includes the frame panel and pumping
system like pumps, valves, piping, etc. and an electrical system that includes boards,
switches, etc.
• Chassis
section
The main chassis is made of aluminum die cast and the external panel is made of
aluminum or is injection-moulded. Casters are made of polyurethane and can be
used in a clean room.
• Pumping
system
The pumping system uses components exclusively designed for HELIOT, such as
the analyzer tube, compound molecular pump, valve block, etc. This has made it
possible to provide a pumping mode like the unique select free flow and has
realized the maximum connecting pressure of 1000 Pa and a sensitivity range of
E-12 to E-4 Pa
⋅
m
3
/sec.
The compound molecular pump is provided with a wider measurement range by
changing over the revolution to 90000 rpm or 67000 rpm with the sensitivity
selector switch to change compression ratio.
• Electrical
system
Line voltage can be applied within the range of 90 volts to 110 volts. The
electrical system is compatible with 50 and 60 Hz and requires no changeover of
the switch.
Maximum voltages of 100 VAC and ± 300 VDC are present in the circuit.
(2) Controller
The controller can be divided into the indicating circuit and display circuit.
• Indicating
circuit
Houses CPU, communicates with the CPU of the basic unit and gives commands to
the basic unit.
• Display
circuit
Receives a signal processed by the basic unit and displays the current state and
measurement value on LCD, LED and by audio alarm.
(3) Dimensional drawing
Dimensional drawing for HELIOT 301
Summary of Contents for HELIOT 301
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