Proline Prowirl 73 Commissioning
Endress+Hauser 57
6.5 External pressure/temperature sensors
Please note the following when reading in external pressure or temperature values via the HART
input:
!
Note!
In the case of applications with external sensors, Prowirl 73 itself may not be set to the burst mode.
If an external sensor (e.g. Cerabar HART) is to be set later locally, the following is mandatory: In
order to be able to connect the FieldCare or FieldXpert in combination with the HART Commubox
FXA195 to the external HART sensor, the BURST MODE of the external HART sensor must be
switched off (OFF). Only after conclusion of the setting the BURST MODE may be configured to
ON (the reason is that the HART communication between FieldCare or FieldXpert and external
HART sensor can be disturbed by the HART burst pulses).
In order to connect Prowirl 73 HART with an external HART sensor, the following steps must be
considered:
1. Wire Prowirl 73, active barrier RN221N and external pressure and temperature sensors
å 19, å 20 and å 21.
2. Guarantee that with Prowirl 73 under GROUP SELECT\HART INPUT the function HART
INPUT is set correctly according to the external sensor – thus setted to PRESSURE or
TEMPERATURE.
3. The HART icon must be displayed in a steady condition. A flashing condition indicates a bad
communication. In case of a bad communication please proceed as follow:
– If the error #523 HART-IN:T.-OUT appears on the display of the Prowirl 73, it indicates that
the BURST MODE of the external sensor is not activated (= OFF). In this case proceed as
follows to eliminate the error:
a. Establish a connection to the external HART sensor via FieldCare or FieldXpert in
combination with the HART Commubox FXA195.
b. Guarantee that it is set BURST OPTION = 1 in the function OPERATING
MENU\TRANSMITTER INFO\HART DATA.
c. Activate BURST MODE (= ON).
d. Guarantee that with Prowirl 73 under GROUP SELECT\HART INPUT the function
HART INPUT is set correctly to PRESSURE or TEMPERATURE (according to the
external sensor). In the following function ERROR VAL. PRESS or ERROR VAL. TEMP
the pressure or temperature is specified. This function is used for the density calculation,
if the burst mode communication in the Prowirl 73 is incorrect. An incorrect
communication between Prowirl 73 and the external sensor is displayed with the error
messages #520 to #523.
– If the error #521 HART-IN:DOUBLE appears on the display of the Prowirl 73, it indicates
that the BURST MODE of the external sensor is activated (= ON), but sending more than
one process data (BURST OPTION > 1). Therefore Prowirl 73 cannot decide to which value
it has to be revert. In this case proceed as follows to eliminate the error:
a. Reset the external HART sensor to the factory setting. This guarantees that the BURST
MODE is deactivated to establish a interference-free connection to the sensor.
E.g. Cerabar: reset via input of the reset code "7864" under OPERATING MENU\
OPERATION\ENTER RESET CODE.
b. Establish a connection to the external HART sensor via FieldCare or FieldXpert in
combination with the HART Commubox FXA195.
c. Guarantee that it is set BURST OPTION = 1 in the function OPERATING
MENU\TRANSMITTER INFO\HART DATA.
d. Important: Reactivate (= ON) the BURST MODE at the end only.
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