Instructions for Use
– SCHMIDT
®
Flow Sensor SS 20.500
Page 34
9 Technical data
Measuring parameters
Standard velocity w
N
of air, based on standard conditions
20 °C and 1013.25 hPa
Medium temperature T
M
Medium to be measured
Air or nitrogen, other gases on request
Measuring range w
N
0 ... 1 / 2.5 / 5 / 10 / 20 / 35 / 50 m/s
Lower detection limit w
N
0.06 m/s
Measuring accuracy w
N
23
- Standard
- Precision
±(3 % of measured value + [0.4 % of final value; min. 0.02 m/s])
±(1 % of measured value + [0.4 % of final value; min. 0.02 m/s])
Reproducibility w
N
±1 % of measured value
Response time (t
90
) w
N
3 s (jump from 0 to 5 m/s)
Measuring range T
M
-40 ... +85 °C
Measuring accuracy T
M
(w
N
> 1 m/s)
±1
K (0 … 30 °C); ±2 K in remaining interval
Operating temperature
Medium:
-40 ... +85 °C
Electronics: -20 ... +70 °C
Humidity range
0 ... 95 % rel. humidity (RH), non-condensing
Max. operating pressure
Compact version: 10 bar
Remote version: atmospheric (< 1,300 hPa)
Operating voltage U
B
24 V
DC/AC
± 20 %
Current consumption
typ. 60 mA, max. 170 mA
Analog outputs
- Type: Auto-U/I
Voltage output
Current output
Switching hysteresis
- Maximum load capacity
Flow velocity w
N
, medium temperature T
M
Automatic switching of signal mode based on load R
L
0 ... 10 V
for R
L
≥ 550 Ω
4 ... 20 mA for R
L
≤ 500 Ω
50 Ω
10 nF
Electrical connection
Plug-in connector M12, A-coded, 5-pin, male, screwed
Max. line length
Voltage: 15 m; current: 100 m
Type of protection
IP 65 (housing) / IP 67 (probe)
Protection class
III (SELV) or PELV (EN 50178)
Min. immersion depth
58 mm (lower values on request)
Length compact version
Probe: 100 / 150 / 350 mm; special:
100 … 1000 mm
Length remote version
Probe: 161.5 mm
Cable: 3
m; special: 1 … 30 m (in steps of 10 cm)
Materials
PBT, stainless steel 1.4404, aluminum anodized
Coatings (optional): Polyurethane, Parylene
Weight
400 g max. (without cable)
23
Under reference conditions