Description of device functions Proline Prowirl 73
134 Endress+Hauser
OFF-VALUE Prerequisite
The function is only available if a limit value was selected in the ASSIGN STATUS
function (ä 132).
Description
Use this function to assign a value to the switch-off point (status output deenergized).
The value can be greater or less than the switch-on point. Only positive values are
permitted (exception: LIMIT TEMPERATURE).
The appropriate unit is taken from the SYSTEM UNITS (ä 102) or MEASURING
VALUES (VELOCITY) group.
User input
5-digit floating-point number [unit]
Factory setting
Depends on the option selected in the ASSIGN STATUS function.
– If LIMIT VOLUME FLOW was selected: see table ä 180
– If LIMIT TEMPERATURE was selected: 170 °C
(converted to the selected UNIT TEMPERATURE)
– If LIMIT MASS FLOW was selected: 9 kg/h
(converted to the selected UNIT MASS FLOW)
– If LIMIT CORRECTED VOLUME FLOW was selected: 9 Nm³/h
(converted to the selected UNIT CORRECTED VOLUME FLOW)
– If LIMIT HEAT FLOW was selected: 9 kW
(converted to the selected UNIT HEAT FLOW)
– If LIMIT TOTALIZER 1 was selected: 0
(converted to the selected UNIT TOTALIZER 1)
– If LIMIT TOTALIZER 2 was selected: 0
(converted to the selected UNIT TOTALIZER 2)
– If LIMIT CALCULATED SATURATED STEAM PRESSURE was selected: 9 bar a
(converted to the selected UNIT PRESSURE)
– If LIMIT VELOCITY was selected: 9 m/s
(converted to the selected unit of VELOCITY)
– If LIMIT TEMPERATURE (EXTERNAL) was selected: 170 °C
(converted to the selected UNIT TEMPERATURE)
– If LIMIT PRESSURE (EXTERNAL) was selected: 9 bar a
(converted to the selected UNIT PRESSURE)
– If LIMIT DENSITY (EXTERNAL) was selected: 7 kg/m
3
(converted to the selected UNIT DENSITY)
TIME CONSTANT Prerequisite
The function is only available if a limit value (apart from LIMIT TOTALIZER 1 or 2) was
selected in the ASSIGN STATUS function (ä 132).
Description
In selecting the time constant, you define how the measuring signal reacts to severely
fluctuating measured variables, either very quickly (low time constant) or with damping
(high time constant).
The purpose of damping, therefore, is to prevent the status output changing state
continuously in response to fluctuations in flow.
The reaction time of the function depends on the time specified in the FLOW DAMPING
function (ä 170).
User input
0 to 100 s
Factory setting
0 s
ACTUAL STATUS
OUTPUT
Prerequisite
The function is only available if STATUS was selected in the OPERATION MODE
function (ä 122).
Description
The current status of the status output appears on the display.
Display
NOT CONDUCTIVE
CONDUCTIVE
Function description, PULSE, FREQUENCY, STATUS group
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