SCHMIDT® Flow Sensor SS 20.415 LED

Thermal flow sensor for uni- or bi-directional measurement of the flow rate of air and gases with simultaneous detection of the flow direction.

 

  • Thermopile head (very fast response time)
  • Flow and switching signal
  • Probe length straight version: 300 … 1,000 mm (optional special length)
  • Probe length angled version: 150 / 270 x 300 mm
  • Measuring ranges 0 … 1 m/s to 0 … 10 m/s
  • Bi-directional measurement (detection of flow direction, optional)
  • Vertical adjustment (for laminar flow applications, optional)
  • Sensor programing (optional)
  • Cleanroom sensor
  • Extremely compact, because electronics are integrated into the sensor tube.
  • Sensor element in the chamber head and protected against mechanical stress.
  • Linear analog output for measured value output, two switching outputs to output the flow direction and threshold.
  • Operating status indication and serial number of the sensor visible on the sensor, even when it is installed.
  • Special version for the laminar-flow monitoring in cleanrooms with quick-mounting system for simple installation in cleanroom ceiling systems and walls.

 

Option: Monitoring of the speed interval of 0.45 m/s ±20 % (prescribed by official standards) 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

Specifications

Technical data
Measuring quantityStandard flow velocity wN, based on standard conditions 1)
Measured medium Clean air, nitrogen, additional gases on request
Measuring range flow wN0 … 1 / 2.5 / 10 m/s
Max. display range flow wN+ 10 % above measuring range
Lower detection limit flow wN0.05 m/s
Measuring accuracy
Standard wN± (3 % of measured value + 0.05 m/s) 1)
High precision (optional) wN± (1 % of measured value + 0.04 m/s) 1)
Response time (t90) wN1 s (configurable: 0.01 ... 10 s)
Temperature gradient wN< 2 K/min at 5 m/s
Operating temperature
Sensor0 … +60 °C
Storage temperature-20 … +85 °C
Material
Sensor headStainless steel 1.4404
Sensor tubeStainless steel 1.4404
Plug connectorStainless steel 1.4404
General data
HumidityMeasuring mode: Non-condensing (< 95 % RH)
Operating pressure (max.)Atmospheric (700 … 1,300 hPa)
Supply voltage24 V DC ± 10 %
Current consumptionTyp. 30 mA / max. 160 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 low-side driver (open collector at GND), current-limited and short-circuit protected, configurable
Channel 1 (OC): Direction or threshold value; Channel 2 (OC2): Threshold value
External switching voltage / current: Max. 26.4 V DC / 55 mA (typ. 50 mA)
Switching 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 with current interface: 2 mA (according to NAMUR NE43)
Electrical connectionPlug-in-connector M9, male, 7-pin (shielded), screwed
Maximum cable lengthVoltage interface: 15 m
Current interface: 100 m
Mounting positionIn vertical flow direction
Protection type / classIP65 / III or PELV (EN 50178)
Sensor lengthAngled: 150 or 270 mm (vertical) x 300 mm (horizontal)
Straight: Standard 300 mm; special length 300 … 1,000 mm
WeightApprox. 200 g (angled design with 270 x 300 mm)

1) Standard velocity wN based on standard conditions of 20 °C and 1,013.25 hPa, related to adjustment reference; fmr = final measuring range

Subject to technical changes.

Order information

 DescriptionArticle-Number
Basic sensorSCHMIDT® Flow Sensor SS 20.415 version as thermopile head551 490 -A1CDEFGHI
 Options
Mechanical typeSensor length 150 x 300 mm 3        
Sensor length 270 x 300 mm 1        
Sensor length 300 mm (straight) 2        
special length (only straight:) _____ mm (>300 … 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 rangeMeasurement 0 … 1 m/s    1     
Measuring range 0 … 1 m/s, unidirectional, with option LED 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 the directionUnidirectional      1   
Switching output OC 1 = direction signal (only bidirectional)      2   
Representation of the direction with halved analog signal: 0 m/s = 8 mA or 5 V output signal (only bidirectional)      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 incl. factory calibration certificate        2 
High precision adjustment incl. 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, 5 m length, open cable ends, material PUR535 279
Connection cable with coupler socket, length ________ m, open cable ends (length 2 … 100 m; 1 m steps)505 911 - 4
Connection cable, 7-pin with angled socket, 10 m length, open cable ends, material PUR535 281
Power supply 24 V/1 A DC (output), 115/230 V AC voltage supply535 282

Mounting and fixing technology

DescriptionArticle-Number
Assemply kit for tube connection for MD 10.010 / 10.015 with hose clamps and band to adapt it so the tube’s 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 an additional sum function and a second measuring input527 330
LED display MD 10.015, similar to 527 330 but with 24 V DC voltage supply528 250

Miscellaneous

DescriptionArticle-Number
Measuring Section Calibrator set (8 / 12 / 16 mA)546 741 - 4

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