Hach-Lange WPC-22 - Manual (Page 8)

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. If this equipment is used outdoors or in
potentially wet locations, a Ground Fault Circuit Interrupt (GFCI/GFI)
device must be used for connecting the equipment to its main power
source.
D A N G E R
Electrocution hazard. Protective Earth Ground (PE) connection is
required.
Use shielded twisted-pair cable for all electrical connections except input
power. Use of non-shielded cable may result in radio frequency emission
or susceptibility levels higher than the allowed levels.
To prevent shock hazards from ground currents in inadequate ground
systems, connect the shield at only the instrument end. Do not connect
the shield wire at both ends.
Electrical connections
D A N G E R
Electrocution hazard. Do not use conduit to supply power. The
enclosure does not have a protective Earth Ground (PE) connection.
D A N G E R
Electrocution hazard. Always remove power to the instrument before
making electrical connections.
Figure 4 shows the wiring connections and general wiring procedure.
Make all electrical cable connections through the strain-relief fittings. To
keep the enclosure rating:
• Do not put more than one cable (or two wires) through a strain-relief
fitting.
• Make sure that the strain-relief fittings that are unused have rubber
cable plugs in them. Use strain-relief fittings of the appropriate
environmental rating.
Obey all codes and regulations for wiring. Tighten the strain relief fittings
to hold the cables securely.
Figure 4 Wiring overview
1 Analog input/output connections 3 Alarm connections (digital outputs)
2 Communication connections
(RS232 and RS485)
4 Strain-relief fitting for external
connections (4x)
8 English