Hach IO9000, User Instructions

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Electrical installation
D A N G E R
Electrocution hazard. Always remove power to the instrument before making electrical connections.
D A N G E R
Electrocution hazard. Use only fittings that have the specified environmental enclosure rating. Obey the
requirements in the Specifications section.
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.
• Use cables with a diameter of 4.3 to 11.4 mm (0.17 to 0.45 in.) so that the cable strain reliefs hold
the cables when tightened.
• Do not put more than one cable in a cable strain relief.
• To connect conduit to a terminal, replace an installed cable strain relief with a conduit fitting. To
connect conduit to the I/O module, replace the applicable cable strain relief with a sealing conduit
to bond the conduit to the bonding plate of the I/O module. For a reliable, low impedance ground
connection, an independent ground wire with equivalent gauge can be pulled and attached at the
ground lug terminal on the bonding plate.
• Close all unused cable strain reliefs with rods, cables or the supplied sealing cords to keep out
moisture.
• For relay connections, it is necessary to use a 20 A circuit breaker (at maximum). Relay
connections must have a local disconnection device. The disconnection device must clearly
identify that this device is the disconnection device. Make sure that the device is in a location
where there is sufficient clearance around it to make connections and to do maintenance tasks.
English 9