Description of device functions Proline Prowirl 73
126 Endress+Hauser
TIME CONSTANT Prerequisite
The function is only available if FREQUENCY was selected in the OPERATION MODE
function (ä 122).
Description
In selecting the time constant, you define how the frequency output signal reacts to
severely fluctuating measured variables, either very quickly (low time constant) or with
damping (high time constant).
User input
Floating point number: 0 to 100 s
Factory setting
5 seconds
FAILSAFE MODE Prerequisite
The function is only available if FREQUENCY was selected in the OPERATION MODE
function (ä 122).
Description
Use this function to specify the response of the frequency output in the event of an error.
The dictates of safety render it advisable to ensure that the frequency output assumes a
predefined state in the event of a fault. The setting you select here affects only the
frequency output. It has no effect on other outputs or the display (e.g. totalizers).
Options
FALLBACK VALUE
0 Hz output.
FAIL LEVEL
The frequency specified in the FAILSAFE VALUE function (ä 126) is output.
HOLD VALUE
Measured value output is based on the last measured value saved before the error
occurred.
ACTUAL VALUE
Measured value output is based on the current flow measurement. The fault is ignored.
Factory setting
FALLBACK VALUE
FAILSAFE VALUE Prerequisite
The function is only available if FREQUENCY was selected in the OPERATION MODE
function (ä 122) and FAIL LEVEL was selected in the FAILSAFE MODE function
(ä 126).
Description
Use this function to define the frequency the measuring device should output in the
event of a fault.
User input
Max. 4-digit number: 0 to 1250 Hz
Factory setting
1250 Hz
ACTUAL FREQUENCY Prerequisite
The function is only available if FREQUENCY was selected in the OPERATION MODE
function (ä 122).
Description
The computed actual value of the output frequency appears on the display.
Display
0 to 1250 Hz
Function description, PULSE, FREQUENCY, STATUS group
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