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• The analog outputs are self-powered. Do not connect to a load with
voltage that is independently applied.
• The analog outputs cannot be used to supply power to a 2-wire (loop-
powered) transmitter.
Connect the relays (optional)
W A R N I N G
Potential Electrocution Hazard. Always disconnect power to the
instrument when making electrical connections.
W A R N I N G
Potential Electrocution Hazard. Power and relay terminals are
designed for only single wire termination. Do not use more than one
wire in each terminal.
W A R N I N G
Potential fire hazard. Do not daisy-chain the common relay
connections or jumper wire from the mains power connection inside
the instrument.
C A U T I O N
Fire hazard. Relay loads must be resistive. Always limit current to the
relays with an external fuse or breaker. Obey the relay ratings in the
Specifications section.
The controller contains four electromechanical relays (Relay A, B, C and
D) that are opened or closed by the measured turbidity or diagnostics.
Refer to
Configure the relays
on page 19. The relay outputs are not
powered.
Refer to
General wiring procedure
connect the relays to a control or alarm device.
The relay terminals accept 18–12 AWG wire (as determined by load
application). Wire gauge less than 18 AWG is not recommended.
When switching large inductive loads (e.g., motors and pumps) or
currents higher than 5 A, use an auxiliary relay to extend the controller
relay life.
14 English
on page 10,
Figure 8
and
Table 3
Use the relays at either all high voltage (greater than 30 V-RMS and
42.2 V-PEAK or 60 VDC) or all low voltage (less than 30 V-RMS and
42.2 V-PEAK, or less than 60 VDC). Do not configure a combination of
both high and low voltage.
Figure 8 Typical wiring configuration
1 Relay A
2 Relay C
3 Capacitor (0.1 µF, 600 V)
4 Resistor (100 ohms, 1 watt)
Table 3 Relay wiring information
to
NC
Normally closed
5 Control or alarm device, non-
inductive load switching
6 Control or alarm device, inductive
load switching
7 100–230 VAC
8 Phase 2 or N
COM
NO
Common
Normally open
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