Connect Optional Devices - Hach Polymetron 9611sc PO4 3- Installation Manual

Connect optional devices

Install the cables for output or input devices as shown in
that is specified for the connection. Refer to
to the operations manual.
Figure 13 Device connection
Connect to the relays
Electrocution hazard. Do not mix high and low voltage. Make sure that the relay connections are all
high voltage AC or all low voltage DC.
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.
Wire gauge less than 1.0 mm
The analyzer contains relays for sample concentration alarms (2x), analyzer system warning and
analyzer system shutdown. Refer to
(NO = normally open, COM = common, NC = normally closed).
Connect to the 4–20 mA outputs
Use twisted pair shielded wire for the 4–20 mA output connections. Connect the shield at the
recorder end or the analyzer end. Do not connect the shield at both ends of the cable. Use of non-
shielded cable can result in radio frequency emission or susceptibility levels higher than the allowed
levels.
Refer to Wiring connections overview
on page 20 for wiring and load impedance specifications.
Note: The 4-20 mA outputs cannot be used to provide power to a 2-wire (loop-powered) transmitter.
16 English
Specifications
D A N G E R
C A U T I O N
N O T I C E
2
(18 AWG) is not recommended.
Wiring connections overview
on page 13 to connect the device. Refer to
Figure 13. Make sure to use the wire gauge
on page 20. To configure a device, refer
on page 13 to connect a device
Specifications