Instructions for Use
– SCHMIDT
®
Flow sensor SS 20.260
Page 18
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 ranges
10
w
N
0 ... 10 / 20 / 40 / 50 / 60 m/s
Lower detection limit w
N
0.2 m/s
Measuring accuracy
11
w
N
- Standard
- Precision
±(5 % of measured value + [0.4 % of final value; min. 0.02 m/s])
±(3 % of measured value + [0.4 % of final value; min. 0.02 m/s])
Reproducibility w
N
±1.5 % of measured value
Response time (t
90
) w
N
3 s (jump from 5 to 0 m/s)
Temperature gradient w
N
< 8 K/min (@ 5 m/s)
Measuring range T
M
-20 ... +120 °C
Measuring accuracy T
M
(w
N
≥ 2 m/s)
±1 K (0 ... 40 °C)
±2 K (remaining measuring range)
Operating temperature
- Medium
- Electronics
-20 ... +120 °C
0 ... +70 °C
Humidity range
0 ... 95 % rel. humidity (RH), non-condensing
Operating pressure
Atmospheric (700 ... 1,300 mbar)
Operating voltage U
B
24 V
DC
± 10 % (reverse voltage protected)
Current consumption
Typ. < 40 mA, 60 mA max.
Analog outputs
- Voltage output
- Current output
- Maximum load capacity
1 or 2 pcs. (short-circuit protected)
0 ... 10 V
(R
L
≥ 10 k
)
4 ... 20 mA
(R
L
≤ 300
)
10 nF
Electrical connection
Non-detachable connecting cable, pigtail
12
, 4-pin, length 2 m
Special lengths: 3 … 100 m (in steps of 1 m)
Maximum cable length
Voltage signal: 15 m, current signal: 100 m
Type of protection
IP54 (enclosure), IP 65 (probe)
Protection class
III (SELV) or PELV (according EN 50178)
Mounting tolerance
±3° relative to flow direction
Min. tube diameter
DN 25
Mounting
Thread M18 x 1 at sensor enclosure, accessories (option)
Installation length
50 / 100 / 200 / 350 / 500 mm
Weight
200 g max.
Table 7
10
Measuring ranges of 50 m/s and 60
m/s only for variant “2”.
11
Under conditions of the reference.
12
With cable end sleeves