Endress+Hauser Proline Promag 55 Operating Manual page 84

3 Transducer Block
84
Write access with
Parameter operating mode
(MODE_BLK)
Process - Pressure AUTO - OOS
Shock Suppression
Device functions Proline Promag 55 FOUNDATION Fieldbus
"Flow" Transducer Block/base index 1400
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 the "Low Flow Cut Off - On Value" parameter
→ Page 83).
Use this function to define the time span for active pressure shock
suppression.
Activation of pressure shock suppression
Pressure shock suppression is activated once 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:
• Flow reading on display → 0
• Totalizer reading → The totalizers are pegged at the last correct value.
Deactivation of 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 cut off (see point c in graphic).
Q
n
m
m = on value (low flow cut off), n = off value (low flow cut off)
User input:
Max. 4-digit number, incl. unit: 0.00 to 100.0 s
Factory setting:
0.00 s
Description
Command:
Valve closes
After filling
Pressure shock suppression
a b c
inactive active
inactive
Given time
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