Endress+Hauser Proline Prosonic Flow 93T Portable Operating Instructions Manual page 103

Proline Prosonic Flow 93T Portable
Endress+Hauser
BASIC FUNCTION PROCESS PARAMETER CONFIGURATION
PRESSURE SHOCK
SUPPRESSION
(6404)
Functional description
The closure of a valve can cause brief but severe movements of the fluid in the piping
system, movements which the measuring system registers. The pulses totaled 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".
!
Note!
Note that pressure shock suppression cannot be used unless the low flow cut off is
active, (see function OFF VALUE LOW FLOW CUT OFF  ä 102).
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 a in graphic).
While pressure shock suppression is active, the following conditions apply:
• Current output  outputs the current corresponding to zero flow.
• Pulse/Freq.-output  outputs the frequency corresponding to zero flow.
• Flow reading on display =  0.
• Totalizer reading  the totalizers are pegged at the last correct value.
Deactivation of the pressure shock suppression
The pressure shock suppression is deactivated after the time interval, set in this
function, has passed (see point b in graphic).
Factory setting
l/s
!
Note!
The actual flow value is displayed and output when the time interval for the pressure
shock suppression has passed and the flow exceeds the switch-off point of the low flow
cut off (see point c in graphic).
Q
Command:
Valve closes
n
m
inactive
User input
max. 4-digit number, incl. unit: 0.00 to 100.0 s
Factory setting
l/s
Description of Device Functions
After filling
Pressure shock suppression
a c
b
active inactive
Given time
t
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