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a) Setting standard conditions
The air mass flow measured and output by the SFAM refers to standard conditions.
The SFAM is calibrated at the factory to the physical standard conditions in
accordance with DIN 1343 and the unit to l/min.
Note
If different standard conditions and/or other units units in contrast to the
calibrated measurement range using the unit l/min, then there are appropriate
characteristic limits è Fig. 22 in the chapter 11 Technical specifications.
The following standard conditions can be selected under the point [Option].
Option
Standard litres as per
Air pressure (absolute)
[bar]
Temperature
[°C]
Fig. 14
3.
Select the desired setting (OFF, 1 or 2) with the A/B buttons.
4.
Press the Edit button to confirm the selection.
[FLW] is displayed and the currently chosen value flashes.
The unit for the flow (l/min or scfm) can be set.
b) Setting the physical unit for the flow
5.
Select the desired setting (l/min or scfm) with the A/B buttons.
6.
Press the Edit button to confirm the selection.
[AnA.F] with the currently set value is displayed.
The analogue filter can be set.
Note
The configured physical unit is shown in the RUN mode in the display at the
bottom right.
c) Setting filter time constants for the analogue filter
With the analogue filter, the rise time (filter time constants) of the analogue output
can be changed (default value = 60 ms).
7.
Choose the value for the filter time constants (15 ms, 30 ms, 60 ms, 125 ms,
250 ms, 500 ms or 999 ms) with the A/B buttons.
8.
Press the Edit button to confirm the set value.
[dIG.F] with the currently chosen value flashes. The digital filter can be set.
d) Setting smoothing for the digital filter
The display values can be smoothed with the digital filter. The degree of smoothing
can be set in 6 steps from d1 = low smoothing to d6 = maximum smoothing. With
increasing smoothing, the switch−on / switch−off time of the switch outputs rises.
With d.OFF, the response time of the analogue output equals the set response
time.
Signal flow from the analogue filter and digital filter
Sensor
Analogue filter
Raw signals
Fig. 15
Note
A high filter time constant and high smoothing can result in a response time of
several seconds.
9.
Select the value for dampening (d1 to d6 or d.OFF) with the A/B buttons.
10. Press the Edit button to confirm the set value.
[ConS] is displayed and the currently chosen value flashes.
The unit for the air consumption (m
Off
1
2
DIN 1343
ISO 2533
ISO 6358
1.01325
1.01325
1
0
15
20
Digital filter
Switching
Out A/Out B
Analogue output
3
, scf or l) can be set.
e) Setting the physical unit for the flow
11. Select the desired setting (m
12. Press the Edit button to confirm the selection.
The currently set value [PnP] or [nPn] for the switching element output
flashes. The switching element output can be set.
f ) Setting switching element output
The two switching outputs can be set through the integrated push/pull stage as a
plus switch (PNP) or zero switch (NPN).
13. Select the desired setting (PNP or NPN) with the A/B buttons.
14. Press the Edit button to confirm the selection.
[Lock] flashes. The security code can be set.
g) Setting security code
To protect the setting from unauthorized access, a numerical code of up to 4 digits
can be set. The security code must be entered each time the settings are changed
(EDIT mode and TEACH mode).
Note
keep the security code in a safe place. If the security code has been forgotten
see the è chapter 6.1 Resetting SFAM to factory setting.
15. Set the desired security code with the A/B buttons.
16. Press the Edit button to confirm the selection.
The SFAM is in RUN mode.
5.5 TEACH mode
In TEACH mode, the switching points can be taught.
Note
The process is the same for teaching the switching outputs Out A (A button) and
Out B (B button). In the following, the process is described using the switching
output Out A.
Display
outputs
Fig. 16
3
, scfm or l) with the A/B buttons.
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