SCHMIDT® Flow Sensor SS 20.515 LED

Thermal flow sensor with integrated electronics for measuring flow velocity of air, especially designed for monitoring laminar flow of air in cleanroom facilities.

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Introduction Technical Data

SCHMIDT® Flow Sensor SS 20.515 LED

Thermal flow sensor with integrated electronics for measuring flow velocity of air, especially designed for monitoring laminar flow of air in cleanroom facilities.

Aerodynamically shaped dumbbell head with optimal flow properties, largely independent of direction
Cleanroom compatible design in accordance with GMP standard to prevent surface contamination
Operating status indication and serial number visible, even when sensor is installed
Flow and temperature signal
Probe length 300 … 1,000 mm (optional special length)
Probe length angled version: 150 / 270 mm x 300 mm
Measuring ranges 0 … 1 / 2.5 / 10 m/s
Vertical adjustment (for laminar flow applications, optional)
Coating (optional; sensor head only)
Cleanroom sensor

New: Now also in short design: 150 mm x 300 mm (angled)

Option: Monitoring of admissible speed interval (prescribed by official standards) of 0.45 m/s ± 20 % with optical signaling at the sensor (LF status indicator)

Laminar flow monitoring in cleanrooms
Process control in pharmaceutical, semiconductor technology and food industry
Use in isolators, flow boxes and sterile filling machines

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	Air or nitrogen, additional gases on request
Measuring range w_N	0 … 1 / 2.5 / 10 m/s
Lower detection limit w_N	0.06 m/s
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	3 s (jump from 0 to 5 m/s)
Temperature gradient w_N	< 2 K/min (at w_N = 5 m/s in air)
T_M (w_N > 1 m/s)	±1 K (10 … 30 °C); ±2 K (remaining measuring range)

Operating temperature
Sensor probe	-20 … +70 °C
Electronics	-20 … +85 °C

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. < 60 mA / max. 100 mA (signal currents included)
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: 10 m; current interface: 100 m
Mounting position	Arbitrary (preferred in vertical down flow direction)
Protection type	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: Standard 300 mm; special length >300 … 1,000 mm (step: 10 mm)
Weight	300 g max. (straight, 1000 mm, type 3)

Material
Sensor head	PBT (glass-fibre reinforced), stainless steel 1.4571, protective coating (optional)
Sensor tube	Stainless steel 1.4404
Plug connector, nut screw	Stainless steel 1.4404
Light ring	PC

Dowloads
Product brochure (02/2024)	Dowload PDF
Instructions for use (551743.02D)	Dowload PDF
3D-STP data	Dowload

SCHMIDT® Flow Sensor SS 20.515 LED

SCHMIDT® Flow Sensor SS 20.515 LED

Technical data

Measuring accuracy

Operating temperature

General data

Material

Dowloads