–
Display is blue; the colour change function is switched off.
r.ON
r.OFF
bLUE
blue
red
red
blue
blue
Tab. 8: Colour change
Requirement
–
SFAB is in EDIT mode and [OutA] flashes
1. Press B button.
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[OutB] flashes.
2. Press the Edit button to confirm the selection.
3. Press the Edit button repeatedly until [rON], [rOFF] or [bLUE] flashes in the
display.
4. Select the desired setting (rON, rOFF or bLUE) using the A/B pushbuttons.
5. Press the Edit button to confirm the selection.
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SFAB is in RUN mode.
7.7.4
Setting the special menu
The following settings can be undertaken in the special menu:
–
Standard conditions
–
Physical units for flow rate (l/h, scfm or l/min)
–
Analogue filter [AnA.F] with filter time constant in ms
–
Digital filter [dIG.F] with smoothing in 7 levels for display and switching output
–
Physical units for air consumption (m3, scf or l)
–
Select the switching output [PnP] or [nPn]
–
Remove security blocking [Lock] with security code
Requirement
–
SFAB is in EDIT mode and [OutA] flashes
1. Press the A or B pushbutton repeatedly until the menu (SPEC) is selected.
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[SPEC] flashes.
2. Press the Edit button to confirm the selection.
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[Option] flashes. The standard conditions (OFF, 1 or 2) can be set.
7.7.4.1 Setting standard conditions
The air mass flow measured and output by the SFAB refers to standard conditions.
The SFAB is factory calibrated to the physical standard conditions according to
DIN 1343.
Changing the reference standard only adjusts the display on the sensor. The
analogue value at the analogue output still refers to DIN 1343 and must be
converted.
• Multiply the end value of the flow measurement range by the specified correc-
tion factor.
• End value of the analogue output refers to the end value of the measuring
range. This changes the transfer function.
REF/Cond
Off
1
2
Standard
DIN 1343
ISO 2533
ISO 6358
Air pressure (absolute)
[kPa]
101.325
101.325
100
Temperature
[°C]
0
15
20
Humidity
[%]
0
0
65
Correction factor, measurement range limit value
1
1.055
1.087
Tab. 9: Standard conditions for flow rate and volume units
1. Select the desired setting (OFF, 1 or 2) using the A-/B pushbuttons.
2. Press the Edit button to confirm the selection.
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[FLW] is displayed and the set value flashes. The unit for the flow rate
(l/h, scfm or l/min) can be set.
7.7.4.2 Setting the physical unit for the flow rate
For the types SFAB-600U and SFAB-1000U, the unit l/h cannot be set due to
display reasons.
1. Select the desired setting (l/h, scfm or l/min) using the A-/B pushbuttons.
2. Press the Edit button to confirm the selection.
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[AnA.F] and the set value are displayed. The analogue filter can be set.
The selected physical unit is shown in RUN mode in the display at the bottom
right.
7.7.4.3 Setting filter time constant for the analogue filter
The rise time (filter time constant) of the analogue output can be changed (default
value = 60 ms) with the analogue filter.
1. Select the value for the filter time constant (15 ms, 30 ms, 60 ms, 125 ms, 250
ms, 500 ms or 999 ms) with the A/B pushbuttons.
2. Press the Edit button to confirm the set value.
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[dIG.F] and the set value flash. The digital filter can be set.
7.7.4.4 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. The switch-on/switch-off time of the switching outputs rises as the
smoothness is increased. With d.Off the smoothing is deactivated.
Fig. 6: Signal flow from the analogue filter to the digital filter
A high filter time constant and high smoothing can result in a switching time of
several seconds.
1. Select the value for cushioning (d1 to d6 or d.OFF) with the A/B pushbuttons.
2. Press the Edit button to confirm the set value.
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[ConS] is displayed and the currently selected value flashes. The unit for
the air consumption (m3, scf or l) can be set.
7.7.4.5 Setting the physical unit for the air consumption
1. Select the desired setting (m3, scf or l) with the A/B pushbuttons.
2. Press the Edit button to confirm the set value.
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The currently set value [PnP] or [nPn] for the switching element output
flashes. The switching element output can be set.
7.7.4.6 Setting switching element output
The two switching outputs can be set as positive switches (PNP) or as zero
switches (NPN) with the integrated push-pull step.
1. Select the desired setting (PNP or NPN) with the A/B pushbuttons.
2. Press the Edit button to confirm the selection.
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[Lock] flashes. The security code can be set.
7.7.4.7 Setting the security code
A numerical code of up to 4 digits can be set to protect the setting from unau-
thorised access. The security code must be entered every time the settings are
changed (EDIT mode and TEACH mode).
1. Set the desired security code with the A/B buttons.
2. Press the Edit button to confirm the selection.
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The SFAB is in RUN mode.
