2.7.3 HART installation configurations
The analyzer has an active 4-20mA HART output.
This makes the physical device a Current Output Device. (Formerly Type C Field Device)
Point to Point configuration in control loop:
In the point to point hardware configuration, data is communicated both analog and digital.
The secondary master is the communicator
Analyzer in a Point to Point configuration
2.7.3.1 Connection out of the control loop:
For service and maintenance it might be necessary to connect with HART while the analyzer is
disconnected from the DCS. The secondary master is connected across a 250Ω resistor. Both analog and
digital communication is possible.
Analyzer connected out of the control loop
2.7.3.2 Multidrop configuration:
The analyzer can be connected in multidrop-mode. This has some restrictions since it is a current output
device.
No more than 5 devices can be connected in multidrop-mode to the DCS to keep the current in the loop
below 20mA. The loop current mode of the 9D-series analyzer has to be set to disabled and each device
must have a unique polling address.
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