SCHMIDT® Flow Sensor SS 20.515 LED

Thermal flow sensor with integrated electronics for measuring the flow rate of air, designed for monitoring the 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 the GMP standard to prevent surface contamination. Operating status indication and serial number of the sensor visible on the sensor, even when it is installed.

 

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

 

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

Specifications

Technical Data
Measuring quantityStandard flow velocity wN, based on standard conditions of TN = 20 °C and pN = 1,013.25 hPa
Temperature of medium TM
Measured mediumAir, nitrogen, other gases on request
Measuring range wN0 … 1 / 2.5 / 10 m/s
Lower detection limit wN0.06 m/s
Measuring range TM-20 … +70 °C
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)
Repeatability wN± 1.5 % of measured value
Response time (t90) wN3 s (jump from 0 to 5 m/s)
Temperature gradient wN< 2 K/min at 5 m/s
Temperatur TM (wN > 2 m/s)± 1 K (10 … 30 °C); ± 2 K in remaining measuring range
Operating temperature
Operating temperature-20 … +70 °C
Storage temperature-20 … +85 °C
Material
Sensor headPBT fibre-glass reinforced, stainless steel 1.4571, protective coating (optional)
Sensor tubeStainless steel 1.4571
ConnectorStainless steel 1.4571
General Data
Relative HumidityNon-condensing (≤ 95 % rH)
Operating pressureAtmospheric (700 … 1,300 hPa)
Supply voltage24 V DC ± 10 %
Current consumptionTypical 80 mA / max. 120 mA
Analog outputs (wN, TM)0 … 10 V (RL ≥ 10 kΩ) and 4 … 20 mA (RL ≤ 300 Ω)
Error signalOnly with current interface: 2 mA
Electical connectionConnector 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: 270 mm or 150 mm (vertical) x 300 mm (horizontal)
Straight: Standard 300 mm; special length 300 … 1000 mm
WeightApprox 200 g (angled design with 270 x 300 mm)

1) under reference conditions

Subject to technical changes.

Order information

 DescriptionArticle-Number
Basic sensorSCHMIDT® Flow Sensor SS 20.515551 550 -ABCD11GH1
 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): >300 … 1,000 mm; 10 mm-steps 9        
Protection designWithout protective coating  1       
With protective coating  2       
Mechanical fixationThreaded bushing M25 with lock nut   1      
Threaded bushing M25 with thread adapter M25 x 1,5 on PG21   2      
Threaded bushing M25 with shaft nut   3      
Welding bush   4      
Flange bush   5      
Without fixing material   6      
Measuring rangesMeasuring range 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     
Measuring directionUnidirectional     1    
Direction representationUnidirectional      1   
Output signals0 … 10 V       1  
4 … 20 mA       2  
Adjustment accuracy and calibrationStandard adjustment        1 
Standard adjustment unidirectional with factory calibration certificate        4 
High precision adjustment incl. factory calibration certificate        2 
Sensor programmingFactory setting         1

Accessories

Connection Technology

DescriptionArticle-Number
Coupler socket, 7-pins, with soldering terminals, for cable Ø of 0.14 mm2535 278
Connecting 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
Connecting cable with angled socket, 7-pin, 10 m length, open cable ends (material PUR)535 281
Power supply 24 V/1 A DC (output), 115/230 V AC voltage supply535 282

Mounting and Fixing Technology

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

Measured Value Display

DescriptionArticle-Number
LED display MD 10.010 in wall housing to show volume flow and flow velocity, 85 … 230 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
Attachable protective clip for dumbbell head against mechanical influence, (stainless steel)531 026
Attachable protective 2-wires-clip for protection against mechanical influences, stainless steel, H2O2-resistant559 124

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