Endress+Hauser Proline Prowirl 73 - Page 141

Proline Prowirl 73 Description of device functions
Endress+Hauser 141
ASSIGN LOW FLOW
CUT OFF
Description
For selecting the process variable on which low flow cut off should act.
Low flow cut off is not taken into account if an option is selected which cannot be
calculated for the fluid selected (e.g. corrected volume selected for saturated steam).
Options
OFF
VOLUME FLOW
MASS FLOW
CORRECTED VOLUME FLOW
HEAT FLOW
REYNOLDS NUMBER*
*This option is not available if
– GAS VOLUME or LIQUID VOLUME was selected in the SELECT FLUID function
(ä 143) or
– REAL GAS was selected in the SELECT FLUID function (ä 143) or
– OTHER was assigned to one of the components in the GAS MIXTURE option in the
SELECT FLUID function (ä 143)
– One of the natural gas equations AGA8-DC92, ISO 12213-2, AGA8 Gross Method 1
or SGERG-88 was selected in the NATURAL GAS option in the SELECT FLUID
function (ä 143)
Factory setting
VOLUME FLOW
ON-VALUE LOW FLOW
CUT OFF
Prerequisite
The function is not available if OFF was selected in the ASSIGN LOW FLOW CUT OFF
function (ä 141).
Description
Use this function to enter the on-value for low flow cut off.
The appropriate unit is taken from the SYSTEM UNITS group (ä 102).
If VOLUME FLOW, MASS FLOW, CORRECTED VOLUME FLOW or HEAT
FLOW is selected in the ASSIGN LOW FLOW CUT OFF function (ä 141):
Low flow cut off is switched on if the value entered is not equal to 0. As soon as the low
flow cut off is active, an inverted plus sign is shown on the local display.
User input
5-digit floating-point number
Factory setting
Below the standard measuring range
If REYNOLDS NUMBER is selected in the ASSIGN LOW FLOW CUT OFF
function (ä 141):
Low flow cut off is activated if the Reynolds number entered here is undershot. When
low flow cut off is active, an inverted plus sign is shown on the local display.
User input
4000 to 99 999
Factory setting
20 000
Function description, PROCESS PARAMETER group