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Home/Sensors/Laboratory, pharmaceutical and clean room technology/SCHMIDT® Flow Sensor SS 20.415 LED

SCHMIDT® Flow Sensor SS 20.415 LED

Thermal flow sensor for uni- or bidirectional measurement of air and gases with simultaneous detection of flow direction.

 

  • Thermopile head (very fast response time)
  • Flow velocity and switching signals
  • Probe length straight version:

- Default: 300 mm

- Special length (option): > 300 … 1,000 mm (step: 10 mm)

  • Probe length of angled version: 150 / 270 mm x 300 mm
  • Measuring ranges 0 … 1 / 2.5 / 10 m/s
  • Bidirectional measurement (optional)
  • Optimized adjustment for LF-applications (optional)
  • Extremely compact (electronics are integrated in probe tube)
  • Sensor element protected against mechanical stress
  • Linear analog output for measured flow velocity
  • Two switching outputs to signal flow direction and threshold
  • 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 ceilings or at walls

 

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
  • 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

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Specifications

Technical data
Measuring quantityStandard flow velocity wN, based on standard conditions 1)
Measured medium Clean a orr, nitrogen, additional gases on request
Measuring range wN(±)0 … 1 / 2.5 / 10 m/s (uni- or bidirectional)
Max. display range wN+10 % above measuring range
Lower detection limit wN(±)0.05 m/s
Measuring accuracy
Standard wN±(3 % of measured value + 0.05 m/s) 2)
High precision (optional) wN±(1 % of measured value + 0.04 m/s) 2)
Response time (t90) wN1 s (configurable: 0.01 ... 10 s)
Operating temperature
Sensor0 … +60 °C
Storage temperature-20 … +85 °C
Material
Sensor headStainless steel 1.4404
Sensor tubeStainless steel 1.4404
Plug connector, nut screwStainless steel 1.4404
Light ringPC
General data
HumidityMeasuring mode: Non-condensing (< 95 % RH)
Operating pressure (max.)Atmospheric (700 … 1,300 hPa)
Supply voltage24 V DC ± 10 %
Current consumptionTyp. 35 mA / max. 150 mA (including all signal output currents)
Analog output wN0 … 10 V (RL > 10 kΩ; CL ≤ 10 nF; short-circuit protected)
4 … 20 mA (RL < 300 Ω; CL ≤ 100 nF)
Switching outputs2 x open collector (at GND), current-limited and short-circuit protected, configurable
-Channel 1 (OC1): Flow direction or threshold value
- Channel 2 (OC2): Threshold value
- External switching voltage / current: Max. 26.4 V DC / 55 mA (typ. 50 mA)
- Hysteresis: 5 % of threshold value (min. ±0.05 m/s)
(<26.4 V DC / 65 mA)
Channel 1 (OC1): direction or threshold value
Channel 2 (OC2): threshold value
Switching hysteresis 5 % of the threshold value, min ± 0.05 m/s
Error signalOnly current interface: 2 mA (according to NAMUR NE43)
Electrical connectionPlug-in-connector M9, male, 7-pin (shielded), screwed
Maximum cable lengthVoltage interface: 10 m; current interface: 100 m
Mounting positionStraight: ±3° relative to flow direction (uni- or bidirectional)
Angled: Vertical downdraft flow (per design
Protection typeIP65; electrical connector: IP67 (with correctly attached cable)
Protection classIII (SELV) or PELV (EN 50178)
Sensor lengthAngled: 150/270 mm (vertical) x 300 mm (horizontal)
Straight: Standard 300 mm; special length >300 … 1,000 mm
WeightApprox. 200 g (angled design with 270 mm x 300 mm)

1) Standard conditions: TN = 20 °C and pN = 1,013.25 hPa

2) Related to adjustment reference; "fmr" = final measuring range

Subject to technical changes.

Order information

 DescriptionArticle-Number
Basic sensorSCHMIDT® Flow Sensor SS 20.415 LED551 490 -A1CDEFGHI
 Options
Mechanical typeSensor length angled: 150 mm x 300 mm 3        
Sensor length angled: 270 mm x 300 mm 1        
Sensor length straight: 300 mm 2        
Straight, special length: _____ mmLength: 310 … 1,000 mm (10 mm steps) 9        
ProtectionWithout protective coating  1       
Mechanical fixingThreaded bush M25 with counternut   1      
Threaded bush M25 with thread adapter M25 x 1.5 to PG21   2      
Threaded bush M25 with shank nut   3      
Welding bush   4      
Flange bush   5      
Without fixation material   6      
Measuring rangeMeasuring rang 0 … 1 m/s    1     
Measuring range 0 … 1 m/s, unidirectional, with option LF indication of threshold monitoring (0.45 m/s ± 20 %)    4     
Measuring range 0 … 2.5 m/s    2     
Measuring range 0 … 10 m/s    3     
Measurement directionUnidirectional     1    
Bidirectional     2    
Representation of directionUnidirectional      1   
Switching output OC 1 = direction signal (only bidirectional)      2   
Zero flow corresponds with halved analog signal (only bidirectional)0 m/s = 8 mA / 5 V output signal      3   
Output signals0 … 10 V       1  
4 … 20 mA       2  
Adjustment accuracy and calibrationStandard adjustment without certificate        1 
Standard adjustment unidirectional with factory calibration certificate        4 
Standard adjustment bidirectional with factory calibration certificate        5 
High precision adjustment with. factory calibration certificate        2 
High precision adjustment with factory calibration certificate, bidirectional        3 
Sensor programmingFactory setting         1
Customer-specific programming of switching polarity, threshold value, splitting signal, response time         2

Accessories

Connection technology

DescriptionArticle-Number
Coupler socket, 7-pin with soldering sleeves for cable Ø 0.14 mm²535 278
Connection cable with coupler socket, 7-pin, 5 m length, open cable ends, material PUR535 279
Connection cable with coupler socket, 7-pin, length selectable (2 … 100 m; 1 m steps), open cable ends505 911 - 4
Connection cable with angled socket, 7-pin, 10 m length, open cable ends, material PUR535 281
Power supply unit: output 24 V / 1A DC, supply voltage 115/230 V AC (strip terminal)535 282

Mounting and fixing technology

DescriptionArticle-Number
Assembly kit for pipe assembly suitable for MD 10.010/10.015 including pipe clamps and collar for adjustment to pipe diameter531 394

Measured value display

DescriptionArticle-Number
LED display MD 10.010 in wall housing to show volume flow and flow velocity, 85 … 250 V AC and sensor power supply527 320
LED display MD 10.010, similar to 527 320 but with 24 V DC voltage supply528 240
LED display MD 10.015, similar to 527 320 but with additional sum function and second measuring input527 330
LED display MD 10.015, similar to 527 330 but with 24 V DC voltage supply528 250

Miscellaneous

DescriptionArticle-Number
Calibrator MK 40.415 - Set (8 / 12 / 16 mA)546 741 - 4

Downloads

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