FMC Technologies Proline Promass 83 E - Function Description

Issue/Rev. 0.2 (12/12) MN0M023 • Page 69
Device Functions Proline Promass 83 7 Block OUTPUTS
MEASURING MODE
(continued)
• PULSATING FLOW
If flow is characterized by severe fluctuations as is the case, for example, with
reciprocating pumps, flow components outside the measuring range are buffered,
balanced and output after a maximum delay of 60 seconds. If the buffered data cannot
be processed within approx. 60 seconds, a fault/notice message appears.
Under certain plant conditions, flow values can aggregate in the buffer, for example in
the case of prolonged and unwanted fluid backflow. However, this buffer is reset in all
relevant programming adjustments which affect the current output.
" Caution!
If the option BATCH UPWARDS or BATCH DOWNWARDS is selected in the function
ASSIGN CURRENT OUTPUT (4000), the option is automatically specified and cannot be
edited.
Detailed explanations and
information
How the current output responds under the following postulated
conditions:
1. Defined measuring range (m–n): m and n have the same sign
A0001248
and the following flow behavior:
A0001265
•STANDARD
The current output signal is proportional to the measured variable. The flow
components outside the scaled measuring range are not taken into account for signal
output.
A0001267
• SYMMETRY
The current output signal is independent of the direction of flow.
A0001268
• PULSATING FLOW
Flow components outside the measuring range are buffered, balanced and output after
a maximum delay of 60 seconds.
A0001269
(continued on next page)
Function description
OUTPUTS o CURRENT OUTPUT (1...3) o CONFIGURATION
Q
20
4
0
mA
➀➁
t
Q
t
mA
t
mA
t
S=A
A
S
mA