Operating Instructions OXY5500 Gas Analyzer
16 Endress+Hauser
4.8 Analyzer connections
The fiber optic oxygen cable to the SMA connector, located at the bottom of the OXY5500, will be installed at the
factory. Additional connectors are available as shown in Figure 9.
RS-232/RS-485 Interface: The unit has standard RS-232 communication via Modbus protocol. Use care in
making connections as described in Modbus Communication → to avoid communication problems and
potential damage to the unit.
Optical Module with SMA Connector: The optical module with SMA connector is used to connect to the oxygen
probe, which is installed at the factory.
USB Connection: The USB connection is for service and troubleshooting purposes only. Do not connect during
normal operation. To avoid damage to the port, use only the USB Mini B cable to connect to the unit. Refer to the
Service Software Operations Manual (P/N 4900002254) for system requirements.
Ethernet: The unit uses standard Modbus - TCP/IP communication. Use a CAT5 (or better) cable and make
connections per IEEE 802.3 standard.
Figure 9. Analyzer connections
4.9 Analog outputs/analog input connections
The OXY5500 is equipped with two independent analog outputs and one analog input. The 4-20 mA current loop and
serial output are connected terminal blocks located inside the analyzer electronics enclosure. By default, the 4-20mA
current loop analog outputs (IOUT1/IOUT2) are set to inactive.
The analog outputs are programmable to oxygen and temperature. To allow external data collection, one input port
is available (i.e., external pressure sensor).
Connections can be made with customer-supplied cables for the current loop and alarms. Refer to Figure 10.
Hazardous voltage and risk of electric shock. The analog outputs are not protected against any input voltage. Any
voltage applied to the analog outputs can cause irreversible damage to the circuit.
Hazardous voltage and risk of electric shock. Turn off and lock out system power before opening the electronics
enclosure and making any connections.
Endress+Hauser Class I Division 2 analyzers use a non-incendive protection method and Zone 2 uses an
increased safety ec non-arcing protection method; as such, all portions of the local electrical installation codes
apply. The maximum allowed inductance to resistance ratio (L/R ratio) for the field wiring interface must be less
than 25 µH/Ω.
The 4-20 mA outputs are configured as sourcing to provide power to the loop. If a PLC/HMI is used to provide
power to the loop, an isolator is necessary and must comply with the specifications provided in Table 8.
Installation of the isolator must comply with the non-incendive or non-arcing protection method detailed in the
note above.
Certified Ex e glands and cables, or conduit seal and conduit, should be used where appropriate in compliance
with local regulations.
Fuse Box
Optical
Module
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