Connect to the relays, Connect to the 4–20 ma outputs, Connect to the digital inputs – Hach-Lange HACH 5500 sc Installation User Manual
Page 16
Connect to the relays
D A N G E R
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.
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.
C A U T I O N
Chemical exposure hazard. Obey laboratory safety procedures and
wear all of the personal protective equipment appropriate to the
chemicals that are handled. Refer to the current safety data sheets
(MSDS/SDS) for safety protocols.
N O T I C E
Wire gauge less than 18 AWG is not recommended.
The analyzer contains relays for sample concentration alarms (2x),
analyzer system warning and analyzer system shutdown. Refer to
on page 12 to connect a device (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
on page 12 to connect the device.
Refer to
on page 3 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.
Connect to the digital inputs
The analyzer can receive a digital signal from an external device, such
as a flow meter to stop measurements when flow stops. Each discrete
input is used to enable/disable the corresponding sample channel.
Each digital input can be configured as an isolated TTL type digital input
or as a relay/open-collector type input. Refer to
. By default, the
jumpers are set for isolated TTL type digital input. Refer to
on page 12 to connect the device.
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