Hach-Lange SC 100 - Manual (Page 22)

Alarms and Relays
18
Installation
Figure 15 Alarm and Relay Connections
3.4.2 Connecting the Analog Outputs
DANGER
Explosion hazard. Do not connect or disconnect electrical components or circuits to the
equipment unless power has been switched off or the area is known to be non-hazardous.
Two isolated analog outputs (1 and 2) are provided, see Figure 16 . Each output can be set to 0–20
or 4–20 mA, and can be assigned to represent the measured parameter or secondary
measurement such as temperature. Make connections with twisted-pair shielded wire and connect
the shield at the controlled component end or at the control loop end.
Do not connect the shield
at both ends of the cable. Use of non-shielded cable may result in radio frequency emission or
susceptibility levels higher than allowed. Maximum loop resistance is 500 Ohm. Refer to the
sensor manual for output software setup.
Make wiring connections at the analyzer end as shown in Figure 16 .
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
J5 J5
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
J5 J5
J5 J6 J7
3 2 1
RELAY A RELAY B RELAY C
Disconnect
Power
NC COM NO
Table 4 Output Connections at Terminal Block J6
Recorder Wires Circuit Board Position
Output 2 + 1
Output 2 – 2
Shield 3
Output 1 + 4
Output 1 – 5