Endress+Hauser Proline Prowirl 73 - Page 142

Description of device functions Proline Prowirl 73
142 Endress+Hauser
OFF-VALUE LOW
FLOW CUT OFF
Description
Use this function to enter the off-value for low flow cut off. Enter the off-value as a
positive hysteresis from the on-value.
A0001245
Fig. 34: Example for the behavior of low flow cutoff
Q Flow rate [volume/time]
tTime
aON-VALUE LOW FLOW CUTOFF = 20 m³/h
b OFF-VALUE LOW FLOW CUTOFF = 10%
c Low flow cutoff active
1 Low flow cutoff is switched on at 20 m³/h
2 Low flow cutoff is switched off at 22 m³/h
HHysteresis
User input
Integer 0 to 100%
Factory setting
50%
VELOCITY WARNING Description
Use this function to activate flow velocity supervision (ON).
If the fluid velocity exceeds the value entered in the LIMIT VELOCITY function
(ä 142) the device issues the notice message "#421 FLOW RANGE" (ä 68).
Options
OFF (function switched off)
ON
Factory setting
OFF
LIMIT VELOCITY Description
Enter the maximum allowable flow velocity (limit velocity).
By switching on the VELOCITY WARNING function (ä 142), a warning message is
output once the limit velocity is overshot.
Unit on the display depends on UNIT LENGTH (ä 106).
User input
5-digit floating-point number
Factory setting
75 m/s
Function description, PROCESS PARAMETER group
1
c
c
Q
t
1
2
b
a
2
H