Instructions for Use
– SCHMIDT
®
Flow Sensor SS 20.400
Page 22
9 Technical Data
Measuring quantity
Normal velocity w
N
of air based on normal conditions of 20 °C
and 1013.25 hPa
Medium to be measured
Clean air or nitrogen; more gases on request
Measuring range
(±) 0 ... 1 / 2.5 / 5 / 10 / 20 m/s
Unidirectional or bidirectional
Lower detection limit
(±) 0.05 m/s
Measuring accuracy
17
- Standard
- High precision
±(3 % of meas. value +2 % of end value); min. ±0.05 m/s
±(1 % of meas. value +2 % of end value); min. ±0.04 m/s
Repeatability
±1.5 % of measured value
Response time (t
90
)
1 s (configurable: 0.01 ... 10 s)
Storage temperature
-20 ... +85 °C
Operating temperature
0 ... +60 °C
Humidity range
Not condensing (< 95 % rel. humidity)
Operating pressure
Atmospheric (700 ... 1,300 hPa)
Mounting tolerance
±5° relative to nominal flow direction
Operating voltage
12 ... 26.4 V DC (reverse polarity protected)
Current consumption
Typ. < 35 mA (max. 150 mA)
18
Analog output
- Current
- Voltage
Short circuit protected
4 ... 20 mA
(R
L
≤ 300 Ω; C
L
≤ 100 nF)
0 ... 10 V
(R
L
≥ 10 kΩ; C
L
≤ 10 nF)
Switching outputs
2 pc., open-collector, current-limited, short-circuit-protected
Switch 1 (OC1): Direction or threshold value
Switch 2 (OC2): Threshold value
Max. load:
26.4 V DC / 55 mA
Threshold:
0 ... 100 % of end value; min. ±0.05 m/s
Hysteresis:
5 % of switching threshold; min. 0.05 m/s
Configuration:
Polarity, threshold value (by ordering)
Electrical connection
Plug (male), M9, screwed, 7-pin (shielded)
Line length (max.)
Voltage output: 10 m / current output: 100 m
Protection type
Housing: IP 66 / plug-in connector
19
: IP 67
Protection class
III (SELV) or PELV (EN 50178)
Mounting position
arbitrary
Dimensions / material
- Sensor probe
- Sensor tube
- Plug-in connector
Ø 9 mm x 10 mm
Stainless steel 1.4404
Ø 9 mm x 130 / 200 / 300 mm Stainless steel 1.4404
Ø 14 mm x 40 mm
Stainless steel 1.4404
Weight
About 60 g (at 300 mm probe length)
17
Under reference condition
18
Including all signal output currents
19
Only with correctly attached connecting cable
