Hach Polymentron 9500 Basic User Manual page 12

Figure 6 Top and bottom views
4.3 High-voltage barrier
High-voltage wiring for the controller is located behind the high-voltage barrier in the controller
enclosure. The barrier must remain in place except when installing modules or when a qualified
installation technician is wiring for power, alarms, outputs or relays. Do not remove the barrier while
power is applied to the controller.
4.4 Electrostatic discharge (ESD) considerations
Potential Instrument Damage. Delicate internal electronic components can be damaged by static electricity,
resulting in degraded performance or eventual failure.
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