Device Functions Proline Promass 83 FOUNDATION Fieldbus 7 Block BASIC FUNCTION
Endress+Hauser 53
PRESSURE SHOCK
SUPPRESSION
(6404)
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 filling 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 ON-VALUE LOW FLOW CUT OFF function (6402)).
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 ON-VALUE for the
low flow cut off (see point a in graphic).
While pressure shock suppression is active, the following conditions apply:
• 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).
! Note!
The actual flow value is displayed and output when the time interval for pressure shock
suppression has passed and the flow exceeds the OFF-VALUE for the low flow cut off
(see point c in graphic).
A0001285-EN
m = on value (low flow cut off), n = off value (low flow cut off)
a Activated when the on-value for low flow cut off is undershot
b Deactivated once the time specified expires
c Flow values are taken into account again for calculating the pulses
■ Suppressed values
QFlow
User input:
Max. 4-digit number, incl. unit: 0.00 to 100.0 s
Factory setting:
0.00 s
Function description
BASIC FUNCTION → PROCESS PARAMETER → CONFIGURATION
n
m
a
b
c
inactive
active
inactive
t
Pressure shock suppression
Command:
Valve closes
Q
Given time
After filling
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