HP 1920 Series Getting Started Manual page 7

Gas
NH
3
Cl
2
EMI
All electromagnetic interference (EMI) sources, from outside or inside of the switch and application
system, adversely affect the switch in the following ways:
A conduction pattern of capacitance coupling.
•
Inductance coupling.
•
• Electromagnetic wave radiation.
Common impedance (including the grounding system) coupling.
•
To prevent EMI, use the following guidelines:
If AC power is used, use a single-phase three-wire power receptacle with protection earth (PE) to
•
filter interference from the power grid.
Keep the switch far away from radio transmitting stations, radar stations, and high-frequency
•
devices.
Use electromagnetic shielding when necessary. For example, use shielded interface cables.
•
Maximum concentration (mg/m
0.05
0.01
3
)
3