Hach SC4200c, User Instructions

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W A R N I N G
Electrical shock hazard. Externally connected equipment must have an applicable country safety
standard assessment.
N O T I C E
Make sure that the equipment is connected to the instrument in accordance with local, regional and national
requirements.
3.1 Electrostatic discharge (ESD) considerations
N O T I C E
Potential Instrument Damage. Delicate internal electronic components can be damaged by static
electricity, resulting in degraded performance or eventual failure.
Refer to the steps in this procedure to prevent ESD damage to the instrument:
• Touch an earth-grounded metal surface such as the chassis of an instrument, a metal conduit or
pipe to discharge static electricity from the body.
• Avoid excessive movement. Transport static-sensitive components in anti-static containers or
packages.
• Wear a wrist strap connected by a wire to earth ground.
• Work in a static-safe area with anti-static floor pads and work bench pads.
3.2 Install the module
Install the module in the controller. Refer to the illustrated steps that follow.
Notes:
• To keep the enclosure rating, make sure that all unused electrical access holes are sealed with an
access hole cover.
• To maintain the enclosure rating of the instrument, unused cable glands must be plugged.
• The current to the relay contacts must be 2 A or less. Make sure to have a second switch available
to remove power from the relays locally in case of an emergency or for maintenance.
• Use all the relays at low voltage (less than 30 V-RMS and 42.2 V-PEAK, or less than 60 VDC). For
high voltage applications use the controller relays. Refer to the controller documentation for
additional information.
• The relays are isolated from each other and the low-voltage input/output circuitry.
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