Proline Promass 83E/F/O Description of Device Functions - FMC ...
Proline Promass 83E/F/O Description of Device Functions - FMC ...
Proline Promass 83E/F/O Description of Device Functions - FMC ...
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<strong>Device</strong> <strong>Functions</strong> <strong>Proline</strong> <strong>Promass</strong> 83<br />
9 Block BASIC FUNCTION<br />
Function description<br />
BASIC FUNCTION PROCESS PARAMETER CONFIGURATION<br />
PRESSURE SHOCK<br />
SUPPRESSION<br />
(6404)<br />
The closure <strong>of</strong> a valve can cause brief but severe movements <strong>of</strong> the fluid in the piping<br />
system, movements which the measuring system registers. The pulses totaled in this way<br />
result in a totalizer reading error, particularly in the case <strong>of</strong> batching processes. For this<br />
reason, the measuring device is equipped with pressure shock suppression (= short-term<br />
signal suppression) which can eliminate system-related “disruptions”.<br />
! Note!<br />
Note that pressure shock suppression cannot be used unless the low flow cut <strong>of</strong>f is active,<br />
(see function ON-VALUE LOW FLOW CUT OFF on page 122).<br />
Use this function to define the time span for active pressure shock suppression.<br />
Activation <strong>of</strong> the pressure shock suppression<br />
Pressure shock suppression is activated after the flow falls below the switch-on point <strong>of</strong><br />
the low flow cut <strong>of</strong>f (see point a in graphic).<br />
While pressure shock suppression is active, the following conditions apply:<br />
• Current outputs outputs the current corresponding to zero flow.<br />
• Pulse-/Freq.-output outputs the frequency corresponding to zero flow.<br />
• Flow reading on display 0<br />
• Totalizer reading the totalizers are pegged at the last correct value.<br />
Deactivation <strong>of</strong> the pressure shock suppression<br />
The pressure shock suppression is deactivated after the time interval, set in this function,<br />
has passed (see point b in graphic).<br />
! Note!<br />
The actual flow value is displayed and output, when the time interval for the pressure<br />
shock suppression has passed and the flow exceeds the switch-<strong>of</strong>f point <strong>of</strong> the low flow<br />
cut <strong>of</strong>f (see point c in graphic).<br />
Q<br />
Command:<br />
Valve closes<br />
After filling<br />
Pressure shock suppression<br />
a b c<br />
n<br />
m<br />
t<br />
inactive active inactive<br />
Given time<br />
m = Off-value (low flow cut <strong>of</strong>f)<br />
n = On-VALUE (low flow cut <strong>of</strong>f)<br />
a Active when value falls below the on-value <strong>of</strong> the low flow cut <strong>of</strong>f<br />
b Deactivated after specified time expires<br />
c Flow values are again used to calculate the pulses<br />
■ Suppressed values<br />
Q Flow<br />
A0001285-en<br />
Issue/Rev. 0.2 (12/12) MN0M023 • Page 123
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