Hach ORBISPHERE 366 Series Basic User Manual page 13

Even if the instrument electronics are properly shielded, it is advisable to install the instrument as far
as possible from a possible source of electromagnetic perturbation.
The instrument panel is hinged on the left side, to gain access to keypad, mechanical switches, and
connections. A minimum of 200 mm front clearance is required to open it completely. The front panel
is held close with two screws. It will be necessary to open this panel during operation and installation.
Connections are at the bottom of the instrument. Provide at least a 150 mm bottom clearance for
cable installation.
Make sure the power supply is switched off before opening the front panel, changing any jumper settings or
making any connections in the instrument. Before connecting cables inside the instrument, make sure that they
are disconnected from any power supply.
To access the instrument's terminal block connections, open the instrument front panel, and remove
the protection cover by removing the four screws. Carefully set aside the keypad/display panel,
paying attention not to pull on the cable that connects to the power supply and output card.
4.4 Connection diagrams
Figure 6 3660EX instrument (Example is wired RS 485)
1 Connection to "hazardous area": Inside the
instrument, cables to "hazardous area" must never
overlap the "safe area".
2 Connections to "safe area": "Hazardous area"
cables must be shielded up to the connector, then
the shield must be connected to ground.
3 Shield wire ground
4 Lemo 10
5 PG gland
6 O2, O3 or H2 sensor (hazardous area)
W A R N I N G
7 Current output to hazardous area
8 Alarm outputs
9 Current output to safe area
10 RS-232 or RS-485
11 115 or 230 VAC (L= Line, N=Neutral)
12 PE-Earth
English 13