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9 Block BASIC FUNCTION
Device Functions Proline Promag 55
116
Hauser
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 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 cutoff is active
(see ON-VALUE LOW FLOW CUT OFF function on Page 115).
Use this function to define the time span for active pressure shock suppression.
Activation of the pressure shock suppression
Pressure shock suppression is activated once the flow falls below the switch-on point of
the low flow cutoff (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/frequency 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).
!
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
cutoff (see point
c
in graphic).
a0001285-en
m
= switch-on point (for low flow cutoff),
n
= switch-off point (for low flow cutoff)
a
Activated if on-value of low flow cutoff is not reached
b
Deactivated once the predefined time period has elapsed
c
Flow values are taken into account when calculating the pulses
■
Suppressed values
Q
Flow
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
Содержание Proline Promag 55
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