Function Description - Endress+Hauser PROline Prosonic Flow 93 Function Manual

7 Block BASIC FUNCTION
54
BASIC FUNCTION
PRESSURE SHOCK The closure of a valve can cause brief but severe movements of the liquid in
SUPPRESSION the piping system, movements which the measuring system registers. The
(6404) pulses totalled in this way result in a totalizer reading error, particularly in the
case of batching processes. For this reason, the measuring device is
equipped with pressure shock suppression (= short-term signal suppression)
which can eliminate system-related "disruptions".


Pressure shock suppression cannot be used unless the low flow cut off is
active, (see ON-VALUE LOW FLOW CUT OFF function on Page 53).
Use this function to define the time span for active pressure shock
suppression.
Activation of the pressure shock suppression
Pressure shock suppression is activated after the flow falls below the switch-on
point of the low flow cut off, (see point 1 in graphic).
While pressure shock suppression is active, the following conditions apply:
• Output value OUT of the AI Blocks → Flow value "0"
• Flow reading on display → 0.
• Totalizer reading
Deactivation of the pressure shock suppression
The pressure shock suppression is deactivated after the time interval, set in
this function, has passed (see point 2 in graphic).


The current flow value is only processed and displayed again once the time
interval
for the pressure shock suppression has elapsed and the flow exceeds the
switch-off point for low flow cut off, (see point 3 in graphic).
Low flow cutoff
OFF-Value
ON-Value
Pressure shock suppression
User input:
Max. 4-digit number, incl. unit: 0.00...100.0 s
Factory setting:
0.00 s
PROline Prosonic Flow 93 FOUNDATION Fieldbus

Function description

→
PROCESS PARAMETER (CH1...CH2)
Note!
→
The totalizers are pegged at the last valid value.
Note!
Flowrate
➝ inactive
→
CONFIGURATION
Valve closes
3
2
1
➝ active ➝ inactive
Given time
Endress+Hauser
time