Hach 5740sc, User Manual, Page: 9 / 50

9
Section 3 Installation
DANGER
Only qualified personnel should conduct the installation tasks described in this
section of the manual.
3.1 Connecting/Wiring the Sensor to the sc100
The sensor cable is supplied with a keyed quick-connect fitting for easy attachment to the
controller, see
Figure 1 . Retain the connector cap to seal the connector opening in case
the sensor must be removed. Optional extension cables may be purchased to extend the
sensor cable length. If the total cable length exceeds 100 m (300 ft), a termination box
must be installed. See
Replacement Parts on page 39 .
Figure 1 Attaching the Sensor using the Quick-connect Fittings
3.1.1 Hard-wiring the Sensor to the sc100 Controller
1. Open the controller cover.
2. Disconnect and remove the existing wires between the quick connect and terminal
strip J5, see
Figure 2 .
3. Remove the quick-connect fitting and wires and install the threaded plug on the
opening to maintain the environmental rating.
4. Cut the connector from the sensor cable.
5. Strip the insulation on the cable back 1-inch. Strip ¼-inch of each individual wire end.
6. Pass the cable through conduit and a conduit hub or a strain relief fitting and an
available access hole in the controller enclosure. Tighten the fitting.
7. Reinstall the plug on the sensor access opening to maintain the environmental rating.
8. Wire as shown in Table 1 .
9. Close and secure the controller cover.
NC NC NC
COM COM COM
NO
F1 F2
NO NO
RELAY C RELAY B RELAY A
J1
J2
J4
S1
NETWORK
INTERFACE
CARD
J3
J5
J6
U5
U9
1
1
+ DATA + DATA
+ OUT 2 + OUT 2
– DATA
– OUT 2
SERVICE REQUEST
SHIELD/CHASSIS GND
+ V + V
+ OUT 1 + OUT 1
GND
– OUT 1
2
2
3
3
4
4
5
5
6
PROBES
ANAL
OG OUTP
UTS
ANAL
OG OUTP
UTS
PCB
CONNECTOR
PCB
CONNECTOR
FIELD WIRING
INSULATION MUST
BE RATED TO
80° C MINIMUM
FIELD WIRING
INSULATION MUST
BE RATED TO
80° C MINIMUM
DANGER - EXPLOSION HAZARD
DANGER - RISQUE D'EXPLOSION
DO NOT DISCONNECT WHILE CIRCUIT IS LIVE
UNLESS AREA IS KNOWN TO BE NON-HAZARDOUS.
NE PAS DEBRANCHER TANT QUE LE EST SOUS
TENSION, A MONIS QU'IL NE S'AGISSE D'UN
EMPLACEMENT NON-DANGEROUX
NC NC NC
COM COM COM
NO
F1 F2
NO NO
RELAY C RELAY B RELAY A
J1
J2
J4
S1
NETWORK
INTERFACE
CARD
J3
J5
J6
U5
U9
1
1
+ DATA + DATA
+ OUT 2 + OUT 2
– DATA
– OUT 2
SERVICE REQUEST
SHIELD/CHASSIS GND
+ V + V
+ OUT 1 + OUT 1
GND
– OUT 1
2
2
3
3
4
4
5
5
6
PROBES
ANAL
OG OUTP
UTS
ANAL
OG OUTP
UTS
PCB
CONNECTOR
PCB
CONNECTOR
FIELD WIRING
INSULATION MUST
BE RATED TO
80° C MINIMUM
FIELD WIRING
INSULATION MUST
BE RATED TO
80° C MINIMUM
DANGER - EXPLOSION HAZARD
DANGER - RISQUE D'EXPLOSION
DO NOT DISCONNECT WHILE CIRCUIT IS LIVE
UNLESS AREA IS KNOWN TO BE NON-HAZARDOUS.
NE PAS DEBRANCHER TANT QUE LE EST SOUS
TENSION, A MONIS QU'IL NE S'AGISSE D'UN
EMPLACEMENT NON-DANGEROUX
J5 J5
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