Hach 3700 Series Basic User Manual page 11

Terminal
1
2
3
3
Connect the digital gateway to the controller
Item to collect: Digital extension cable
Use only a digital extension cable that is supplied by the instrument manufacturer. The digital
extension cable is sold separately.
Note: If the length of the digital extension cable is more than 100 m (300 ft), install a termination box. As an
alternative, add an analog extension cable from the sensor to the digital gateway.
1. Remove power from the sc controller.
2. Connect one end of the digital extension cable to the digital gateway.
3. Connect the other end of the digital extension cable to a quick-connect fitting on the sc controller.
Refer to Figure 6.
Note: Keep the cap for the quick-connect fitting for use later.
4. For Class 1, Division 2 Hazardous Location installations, install a connector safety lock on each
end of the digital extension cable. The connector safety locks prevent the cable from being
7
For the best immunity to electrical noise, connect the inner shield wire and the outer shield wire
together with solder before they are put in the terminal block.
8
For Class 1, Division 2 Hazardous Location installations, use a digital extension cable with two
connector safety locks. Refer to .
Table 1 Sensor wiring information
Signal Wire
Temp + Red
Temp – Yellow
7
Shield Clear
7
Shield Black
8
Terminal Signal
4 Sense
5 Drive +
6 Drive –
Wire
Green
White
Blue
English 11