Festo SFAB, Operating Instructions Manual

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3. For panel mounting: loosen retaining screws.
For H-rail or wall mounting: loosen the fixing slide è Fig. 9
Fig. 9: Disassembly
12 Technical data
SFAB -10U -50U -200U -600U -1000U
General
Certification
RCM Mark, c UL us - Recognized (OL)
CE marking Declaration of Conformity
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www.festo.com/sp
Measured variable Flow rate, consumption
Flow direction unidirectional P1
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P2
Measurement principle thermal
Flow measuring range [l/min] 0.1 … 10 0.5 … 50 2 … 200 6 … 600 10 …
1000
Operating pressure [bar] 0 … 10
Operating pressure [kPa] 0 … 1000
Nominal pressure [kPa] 600
Pressure drop [kPa] < 10
Ambient temperature [°C] 0 … 50
Temperature of medium [°C] 0 … 50
Nominal temperature [°C] 23
Operating medium Compressed air in
accordance with ISO
8573-1:2010 [6:4:4] Compressed air in accordance
with ISO 8573-1:2010 [7:4:4]
Nitrogen
Output, general
1)2)
Accuracy of zero point
3)
[% FS] ±0.3
Accuracy of margin 3) [% FS] ±3
Repetition accuracy of zero
point [% FS] ±0.2
Repetition accuracy of
spread [% FS] ±0.8
Temperature coefficient of
spread [% FS/K] ≤ 0.1
Pressure-dependent
spread [% FS/
100 kPa] ±0.5
Switching output
Switching output
2x PNP or 2x NPN, adjustable
Switching function Window comparator or threshold value comparator,
adjustable
Switching element function N/C or N/O contact, adjustable
Max. output current [mA] 100
Voltage drop [V] max. 1.5
Switch-on time adjustable (factory setting: approx. 80 ms)
Switch-off time adjustable (factory setting: approx. 80 ms)
Inductive protective circuit adapted to MZ, MY, ME coils
Analogue output
Characteristic flow rate
curve
[l/min] 0 … 10 0 … 50 0 … 200 0 … 600 0 … 1000
Output characteristic curve
for current [mA] 4 … 20
Max. load resistance of cur-
rent output [Ω] 500
Min. load resistance at
voltage output [kΩ] 10
Rise time [ms] adjustable:
15, 30, 60 (factory setting), 125, 250, 500, 999
Output, additional data
Short circuit current rating
yes
Overload protection present
Electronics
Operating voltage range
[V DC] 15 … 30
Reverse polarity protection for all electrical connections
SFAB -10U -50U -200U -600U -1000U
Electromechanics
Electrical connection
Straight plug, M12x1, 5-pin
Max. connecting cable
length [m] < 10
Mechanics
Mounting position
any
Product weight [g] 160
Note on materials, housing Reinforced polyamide, polycarbonate
Display/operation
Display type
Illuminated LCD, blue
Displayable units l/min, scf, scfm, l, m # , scf, l/h l/min, scf, scfm, l, m #
Setting range for flow rate
threshold value 1% FS … 100% FS
Setting range for consump-
tion impulse threshold
value [l] 0.1 …
1999.9 0.2 …
1999.9 1 …
1999.9 2 …
1999.9 3 …
1999.9
[m
#
] 0.01 … 199.99 0.1 …
1999.9 1 …
19999
[scf ] 0.01 … 199.99 0.03 …
199.99 0.1 … 999.9
Hysteresis setting range 0% FS … 90% FS
Immissions/emissions
Storage temperature
[°C] –20 … +80
Degree of protection IP65
Protection class III
1) Accuracy under nominal conditions (6 bar, 23 °C and horizontal mounting position)
2) % FS =% of the flow rate range end value (full scale)
3) The accuracy of the zero point and accuracy of the spread together correspond to the accuracy of the flow
rate: accuracy of the flow rate = ± (0.3% FS + 3% o.m.v.). % o.m.v. = % of measured value
Tab. 12: Technical data
12.1 Examples for calculating the maximum error of the display
–
Flow rate measuring range: 10 … 1000 l/min (FS = 1000)
–
Measured value: 600 l/min
Spread error (e.g. ±3% FS) Zero point error
Tab. 13
Spread error and zero point error
The spread error is proportional to the measured value. At 600 l/min, the spread
error is 3% of the measured value = 18 l/min.
The zero point error is independent of the measured value. It is 0.3% FS = 3 l/min.
Display error under nominal conditions (6 bar, 23 °C):
The display error under nominal conditions is the result of adding the spread and
zero point errors. The actual flow rate is in the range of 600 ± (18+3) l/min = 600 ±
21 l/min.
Display error under different nominal conditions (e.g. 8 bar, 40 °C):
Temperature and pressure errors are spread errors. The temperature error at 40 °C
is ±0.1% FS/K x 17 K = ±1.7% of the measured value = ±10.2 l/min.
The pressure error at 8 bar is
±0.5% FS/bar x 2 bar = ±1% of the measured value = ±6 l/min.
The error of the display at deviating nominal conditions results from the addition
of all error values (span, zero point, temperature, pressure). The actual flow rate is
therefore in the range of 600 ± (18+3+10.2+6) l/min = 600 ± 37.2 l/min.