Hach 366 Serie Manual Básico Del Usuario página 18

4.6.1.2 Alarm contacts
Pass the cable through the cable gland. Attach the "hot" alarm wire to the applicable "NO" or "NC",
data or system alarm terminal, and the return wire(s) to the "Common" terminal on the terminal block
J19.
4.6.2 Analog output cables in "Hazardous" area
Use shielded wire for these connections. Pass the cable through the cable gland. Solder an insulated
wire to the shield of about 12 cm long, with a 3 mm eyelet at the end. Attach the eyelet to the
appropriate earth (ground) screw inside the box, near the terminal block. The wire inside the box
must be as short as possible and never overlap the safe area (3660EX)
For current output, attach the applicable output wires to the + and - terminals of the "IS Current"
terminal block J20 (3660EX) or J13 (3662EX).
For voltage output, attach the applicable output wires to the + and - terminals of the "IS Voltage"
terminal block J14 (3662EX).
4.7 PC connections
Note: On the PC side, a 9-pin connector is needed. Some PC have a 25-pin connector, thus requiring a 25-to-9-pin
adapter. Make sure the adapter is designed for this purpose and that all nine pins are accessible. Some 25-to-9-pin
adapters are supplied for specific use, such as a mouse, and they may not have all the pins connected.
4.7.1 For 3660EX
PC serial connections uses a custom cable passing through the appropriate gland. For instrument to
PC connections up to 12 meters, a RS-232 cable is adequate. If the distance is greater, use an
RS-485 connection, which can run as long as 1 kilometer without a signal loss.
When using the RS-485 output, the PC requires a separate communications port. Hach Lange can
supply a card (ref. 32907) that can be mounted in a standard 16-bit PCI expansion slot.
4.7.2 For 3662EX
A connection from a 3662EX instrument to a PC must only be made when the instrument is located in the safe
area. Never connect the instrument to a PC when the instrument is located in the hazardous area.
A connection from a 3662EX instrument to a PC is required for configuration purposes and should be
done before the physical installation of the instrument in the hazardous area.
If a connection from the instrument to a PC is required after the instrument has been installed in the
hazardous area, disconnect all sensors and any other peripherals from the instrument and then
physically remove the instrument from the hazardous area and place it in the safe area.
When the instrument is in the safe area, connect a PC according to the following diagram:
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