PROline Prosonic Flow 93 FOUNDATION Fieldbus 3 Transducer Blocks (transmission blocks)
Endress+Hauser 115
Pressure Shock
Suppression
AUTO - OOS The closure of a valve can cause brief but severe movements of
the liquid in the piping system, movements which the measuring
system registers. The pulses totalled 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!
Pressure shock suppression cannot be used unless the low flow
cut off is active, (see "Low Flow Cut Off - On Value" parameter,
Page 114).
Use this parameter 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 1 in graphic).
While pressure shock suppression is active, the following
conditions apply:
• Output value OUT of the AI Blocks
→ Flow value “0”
• Flow reading on display
→ 0.
• Totalizer reading
→ The totalizers are pegged at the last valid
value.
Deactivation of the pressure shock suppression
The pressure shock suppression is deactivated once the time
interval set in this parameter has elapsed, (see point 2 in graphic).
Note!
The current flow value is only processed and displayed again
once the time interval for the pressure shock suppression has
elapsed and the flow exceeds the switch-off point for low flow cut
off, (see point 3 in graphic).
User input:
Max. 4-digit number, incl. unit: 0.00...100.0 s
Factory setting:
0.00 s
“TRANSDUCER_CH1” and “TRANSDUCER_CH2” (E+H parameters) /
Base index 1200 and 1300
Parameter Write access
with operating
mode
(MODE_BLK)
Description
2
3
➝ active➝ inactive ➝ inactive
time
Low flow cutoff
Pressure shock suppression
OFF-Value
ON-Value
Valve closes
Flowrate
1
Given time
F06-xxxxxxxx-05-xx-xx-en-000
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