ACS-CONTROL-SYSTEM GmbH
l Lauterbachstr. 57 l D-84307 Eggenfelden l www.acs-controlsystem.de l [email protected]
15
Creeping flow
The creeping suppression serves the purpose of excluding flows from the measurement that can
evolve through convection in a narrow frame around zero, even with a closed valve. At the factory,
the creeping suppression is set at a reasonable standard value in relation to the cross-section of the
flow meter. There are higher tolerances below the standard default settings. The creeping suppression
works with a hysteresis of ±25 %.
Function of the creeping flow illustrated with 0.6 l/min
Example: Creeping flow = 0,6 l/min
If the flow rate is lower than 0.45 l/min the pulse output/analog putput becomes inactive. If the flow
rate exceeds 0.75 l/min a pulse is output again and added to the quantity counter. Similarly, a value is
transmitted to the analog output again.
Setting range:
0,0 ... 20 l/min, in 0,006 l/min steps
Default settings:
0,3 l/min for DN10
0,9 l/min for DN15
3,5 l/min for DN20
5,0 l/min for DN25
Diagnostic
The sub menu „Diagnostic“ shows the actual software/hardware version and many helpful values for
analysis. Knowing about the actual values or the state bits makes it easy to review the measurement
by the manufacturer.
Analog output QA
The analog output is available as current output 4 ... 20 mA or 0 ... 20 mA. Type depending on
purchase order. As a standard it comes with current output 4 ... 20 mA. It can be switched off with
by using the display menu. The current outputs flows from 0 to 22 mA as measure for the flow or the
state of the measuring pipe.
The values here signify for 4 ... 20mA configuration:
- 20 mA the upper limit of the relevant measuring area
- 4 mA the lower limit of the relevant measuring area
- 3.8 mA undershoot the lower limit
- 22 mA overshoot the upper limit
- 3.5 mA empty pipe
Upper and lower limit parameters can be set freely within the type-specific measuring areas of the
device. By default zero flow is set at 4 mA and the respective maximum flow is set at 20 mA.
Setting range: 0 ... 20 mA, 4 ... 20 mA, off
Output value: Flow, temperature
When current output is used make sure the load is not higher than 500 Ohm . A higher load
may cause the device can not provide the maximum current of 22 mA .
Summary of Contents for Flowcont UN
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