SCHMIDT® Flow Sensor SS 20.420

Thermal flow sensor for unidirectional or bidirectional measurement of flow velocity of air with simultaneous detection of flow direction.

Introduction Technical Data

Thermal flow sensor for unidirectional or bidirectional measurement of flow velocity of air with simultaneous detection of flow direction.

SCHMIDT Technology – Simply a question of better measurement

Technical data
Measuring quantity	Standard flow velocity w_N based on standard conditions
Measured medium	Clean air or nitrogen, additional gases on request
Measuring range w_N	(±)0 … 1 / 2.5 / 5 / 10 m/s
Lower detection limit w_N	(±)0.05 m/s

Measuring accuracy
Standard w_N	±(5 % of measured value + [1 % of fmr; min. 0.05 m/s])
High precision (optional) w_N	±(3 % of measured value + [1 % of fmr; min. 0.05 m/s])
Response time (t₉₀) w_N	0.2 s

General data
Humidity	Measuring mode: Non-condensing (< 95 % RH)
Operating pressure (max.)	Atmospheric (700 … 1,300 hPa)
Supply voltage	12 … 26.4 V DC
Current consumption	Typ. < 6 mA (max. 10 mA)
Analog outputs (w_N and T_M)	0 … 10 V (R_L ≥ 10 kΩ; C_L ≤ 1 nF; short-circuit protected)
Electrical connection	Non-detachable cable, 3 wires, length 5 m, with ferrules
Maximum cable length	15 m
Mounting position	±3° relative to flow direction
Protection type	IP65
Protection class	III (SELV) or PELV (EN 50178)
Sensor length	60/110 mm (order option)
Weight	Approx. 40 g (sensor length of 110 mm)