INFICON Composer Elite Gas Concentration Monitor - Manual (Page 31)

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Composer Elite Operating Manual
2.1.2 Grounding and Shielding
2.1.2.1 Power Supply Grounding Requirement
WARNING - Risk Of Electric Shock
The Composer Elite 24 V Power Supply must be
connected to a grounded socket outlet using a
three-conductor power cable with ground terminal.
The Composer Elite 24 V power supply (optional) is connected to ground through
a sealed three-conductor power cable, which must be plugged into a socket outlet
with a protective ground terminal. Extension cables must always have three
conductors including a protective ground terminal.
2.1.2.2 Earth Ground Requirement
CAUTION
A low impedance and reliable earth ground is required for
proper performance of Composer Elite.
If local facilities engineering cannot provide a low impedance earth ground close to
Composer Elite, the following procedure is recommended.
1 Where soil conditions allow, drive two 3 m (10 ft.) copper clad steel rods into
the ground 2 m (6 ft.) apart.
2 Pour a copper sulfate or other salt solution around the rods to improve
the soil’s conductivity.
A near zero resistance measurement between the two rods indicates that a
desirable earth ground is established. In severe cases, it may take several
soakings of solution over several days to reach this condition.
NOTE: Keep connections to this grounding network as short as possible. Most
noise transients contain significant power at high frequencies. A long path
adds to the ground circuit's inductance and thereby increases its
impedance at these frequencies.