SCHMIDT® Duplex-Laminar-Flow Sensor SS 20.415 Twin

Doubled validation of laminar flow

Introduction Technical Data

Doubled validation of laminar flow

Thermal duplex flow sensor for redundant validation of laminar flow applications at one measuring point.

Redundant validation of laminar flow applications
Two independent, full-fledged flow sensors in one unit
Easy installation at one measuring point
No mutual influence of measurements
Confined space becomes a minor matter
‚Plug and Play’ combined with quick assembly
Precise measurement of low flow velocity [w_N]
Straight and angled design for wall and ceiling mounting
Probe length straight version: 300 mm
Probe length angled version: 150 / 270 mm x 300 mm
Measuring ranges 0 … 1 m/s to 0 … 2.5 m/s
Cleanroom sensor
Extremely compact (electronics are integrated in tubes)
Sensor element protected against mechanical stress
Linear analog output for measured value output
Serial number of sensor is visible when installed
Special version for laminar-flow monitoring in cleanrooms with quick-mounting system for simple installation beneath a ceiling systems or at walls
Laminar flow monitoring in cleanrooms
Flow monitoring in pharmaceutical production, semiconductor manufacturing, food production, LCD manufacturing and optical industry
Integration into insulators, FFUs and flow boxes

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 m/s
Max. display range w_N	+10 % above measuring range
Lower detection limit w_N	0.05 m/s

General data
Humidity	Measuring mode: Non-condensing (< 95 % RH)
Operating pressure (max.)	Atmospheric (700 … 1,300 hPa)
Supply voltage	24 V DC ± 10 %
Current consumption	Typ. 32 mA / max. 45 mA
Analog outputs w_N,A & w_N,B	0 … 10 V (R_L ≥ 10 kΩ; short-circuit protected) 4 … 20 mA (R_L ≤ 300 Ω>br> C_L ≤ 10 nF
Error signal	Only with current interface: 2 mA (according to NAMUR NE43)
Electrical connection	Plug-in-connector M9, male, 7-pin (shielded), screwed
Maximum cable length	Voltage interface: 10 m Current interface: 100 m
Mounting position	Straight: ±3° relative to flow direction Angled: Vertical downdraft flow (per design)
Protection type	Sensor: IP65; electrical connector: IP67 (with correctly attached cable)
Protection class	III (SELV) or PELV (EN 50178)
Sensor length	Angled: 150/270 mm (vertical) x 300 mm (horizontal) Straight: 300 mm
Weight	Approx. 250 g (angled design with 270 mm x 300 mm)