Hach 5500sc Installation Manual page 13

Figure 9 Connections on the main circuit board
1 External controller connection
2 Smart probe connection
3 4–20 mA outputs
Connect to power
Electrocution hazard. Use a crimp‐on ring terminal on the main protective earth connection.
Electrical shock and fire hazards. Make sure that the user-supplied power cord and non‐locking plug
meet the applicable country code requirements.
Electrocution hazard. Make sure that the protective earth conductor has a low impedance connection of
less than 0.1 ohm. The connected wire conductor must have the same current rating as the AC mains
line conductor.
The instrument is used for a single phase connection only.
Cord installation: The manufacturer recommends to use the optional cord and sealing gland. Refer
to the maintenance manual for the replacement parts list. For a customer-supplied cord, three
2
1.0 mm (18 AWG) conductors are required with a waterproof outer jacket, and the cord must be
shorter than 3 meters (10 feet). Use a sealing type strain relief to keep the environmental rating of
the instrument. Refer to
Table 3 or Table 4 and
4 Digital inputs
5 Power in
6 Power switch and LED (on =
analyzer is on)
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
Specifications on page 3. To connect power to the instrument, refer to
Figure 10.
7 Power out
8 Power out LED (on = power is
connected to the analyzer)
9 Relays
English 13