SCHMIDT® Laminar-Flow Sensor SS 20.715 LED

Robust validation of laminar flow

Introduction Technical Data

Robust validation of laminar flow

Thermal flow sensor for validation of laminar flow applications.

Robust validation of laminar flow applications
Sensor elements completely encapsulated in stainless steel
Easy to clean nd resistant against H₂O₂
GMP-compliant, robust design
‚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 / 2.5 / 10 m/s
Cleanroom sensor
Extremely compact (electronics integrated in sensor tube)
Linear analog outputs for measured values output
Digital interface: Modbus (RTU)
Operating status indication and serial number are visible, even when sensor is 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

To activate and program the Modbus function, an Interface Splitter and a PC Programming Kit are necessary (accessory).

SCHMIDT Technology – Simply a question of better measurement

Technical data
Measuring quantity	Standard flow velocity w_N based on standard conditions Temperature of medium T_M
Measured medium	Clean air or nitrogen, additional gases on request
Measuring range w_N	0 … 1 / 2.5 / 10 m/s
Lower detection limit w_N	0.1 m/s
Max. display range w_N	+10 % above measuring range
Measuring range T_M	-20 … +70 °C

Measuring accuracy
Standard w_N	±(3 % of measured value + 0.05 m/s)
High precision (optional) w_N	±(1 % of measured value + 0.04 m/s)
Response time (t₉₀) w_N	15 s
Temperatur T_M (w_N > 0.3 m/s)	±1 K (10 ... 30 °C); ±2 K (remaining measuring range)

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. 35 mA / max. 150 mA (including all signal output currents)
Analog outputs (w_N and T_M)	0 … 10 V (R_L > 10 kΩ; C_L ≤ 10 nF; short-circuit protected) 4 … 20 mA (R_L < 300 Ω; C_L ≤ 100 nF)
Error signal	Only current interface: 2 mA (according to NAMUR NE43)
Electrical connection	Plug-in-connector M9, male, 7-pin (shielded), screwed
Maximum cable length	Voltage interface / current interface: 100 m Voltage mode: Use AGND and R_L ≥ 10 k (mass offset)
Mounting position	Straight: ±3° relative to flow direction (unidirectional) Angled: Vertical downdraft flow (per design)
Protection type	IP65; electrical connector: IP67 (with correctly attached cable)
Protection class	III (SELV or PELV)
Sensor length	Angled: 150/270 mm (vertical) x 300 mm (horizontal) Straight: 300 mm
Weight	Approx. 280 g (angled design with 270 mm x 300 mm)
Digital interface	Modbus (RTU); RS485 (EIA-485), 2-wire, 3.3 V