Hach SC4500 User Manual page 18

Electrical shock and fire hazards. Make sure to identify the local disconnect clearly for the conduit
installation.
Potential Electrocution Hazard. If this equipment is used outdoors or in potentially wet locations, a
Ground Fault Interrupt device must be used for connecting the equipment to its mains power source.
Electrocution hazard. The local disconnection means must disconnect all the electrical current-
carrying conductors. Mains connection must keep supply polarity. The separable plug is the
disconnect means for cord connected equipment.
Electrical shock and fire hazards. Make sure that the user-supplied power cord and non‐locking plug
meet the applicable country code requirements.
Explosion hazard. This manual is only for installation of the unit in a non-hazardous location. For
installation of the unit in hazardous locations, use only the instructions and approved control drawing
provided in the hazardous location installation manual.
Install the device in a location and position that gives easy access to the disconnect device and its operation.
The controller can be purchased as either a 100-240 VAC powered model or a 18-28 VDC powered
model. Follow the appropriate wiring instructions for the purchased model.
Supply power to the instrument with conduit or a power cable. Make sure that a circuit breaker with
sufficient current capacity is installed in the power line. The circuit breaker size is based on the wire
gauge used for installation.
For installation with conduit:
• Install a local disconnect for the instrument within 3 m (10 ft) of the instrument. Put a label on the
disconnect that identifies it as the main disconnect device for the instrument.
• Rated for at least 90 °C (194 °F) and applicable to the installation environment
• For permanent connections use only solid wires. Use cable dimensions between 0.75 to 1.5 mm
(18 to 16 AWG). Flexible wires must have a crimped ferrule or pin type terminal on the end.
• Connect equipment in accordance with local, state or national electrical codes.
• Connect the conduit through a conduit hub that holds the conduit securely and seals the enclosure
when tightened.
• If metal conduit is used, make sure that the conduit hub is tightened so that the conduit hub
connects the metal conduit to safety ground.
• The DC power source that supplies power to the DC controller must maintain voltage regulation
within the specified 18-28 VDC voltage limits. The DC power source must also provide adequate
protection against surges and line transients.
For installation with a power cable, make sure that the power cable is:
• Less than 3 m (10 ft) in length
• Rated sufficient for the supply voltage and current.
• Rated for at least 90 °C (194 °F) and applicable to the installation environment
16 English
D A N G E R
W A R N I N G
W A R N I N G
W A R N I N G
W A R N I N G
N O T I C E
2