SCHMIDT® Flow Sensor SS 20.420

Thermal flow sensor for unidirectional or bidirectional measurement of the flow rate of air with simultaneous detection of the flow direction. 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.

 

  • Laminar flow monitoring in clean rooms
  • Monitoring of the room overflow
  • Flow measurement in test benches
  • Production machinery range

Specifications

Technical Data
Measurement quantityStandard flow velocity wN, based on standard conditions of TN = 20 °C and pN = 1,013.25 hPa
Measured mediumClean air or nitrogen
Measurement range wN0 … 1 / 2.5 / 5 / 10 m/s
Lower detection limit wN0.05 m/s
Measurement accuracy
Default wN± (5 % of measured value + 1 % of of measuring range); min. ± 0.05 m/s 1)
High precision (optional) wN± (3 % of measured value + 1 % of of measuring range); min. ± 0.05 m/s 1)
Repeatability wN± 2 % of measured value
Response time (t90) wN0.2 s
Operational temperature
Storage temperature-20 … +85 °C
Operating temperature0 … +60 °C
General data
Relative HumidityNon-condensing (≤ 95 % rH)
Operating pressureAtmospheric (700 … 1,300 hPa)
Supply voltage24 V DC ± 10 %
Current consumptionTyp. < 6 mA (max. 10 mA)
Analog output0 … 10 V (RL ≥ 10 kΩ;; CL ≤ 1 nF; short-circuit protected)
Electrical connectionNon-detachable cable, 3 wires, length 5 m, with ferrules
Maximum line length (recom.)15 m
Protection type / classIP65 / III or PELV (EN 50178)
Material
Sensor headØ 9 mm x 10 mm stainless steel 1.4404
Sensor tubeØ 9 mm stainless steel 1.4404
Total length60 mm

1) under reference conditions

Subject to technical changes.

Order information

 
 DescriptionArticle Number
Basic sensorSCHMIDT® SStrömungssensor SS 20.420 Basic version: wN; cable 5 m Output signal: 0 … 10 V538 045 -A1CDEF
 Optionen
Sensor typeStandard 1     
Mechanical typeSensor length 60 mm  1    
Sensor length 110 mm  2    
Measuring rangeMeasuring range 0 … 1 m/s   1   
Measuring range 0 … 2.5 m/s   2   
Measuring range 0 … 5 m/s   3   
Measuring range 0 … 10 m/s   4   
Measurement direction, setting and adjustmentUnidirectional – standard adjustment (5-%-class)    1  
Unidirectional – standard adjustment with factory calibration certificate (5-%-class)   5  
Bidirectional – standard adjustment (5-%-class), representation of direction with halved analog signal: 0 m/s = 5 V output signal (analog output 50 %)    2  
Bidirectional – standard adjustment with factory calibration certificate (5-%-class), representation of direction with halved analog signal: 0 m/s = 5 V output signal (analog output 50 %)    6  
Unidirectional – high precision adjustment with factory calibration certificate (3-%-class)    3  
Bidirectional – high precision adjustment with factory calibration certificate (3-%-class), representation of direction with halved analog signal: 0 m/s = 5 V output signal (analog output 50 %)    4  
Analog output0 … 10 V     1 
Connection cable5 m cable with open ends      1

Accessories

Connection Technology

DescriptionArticle-Number
Power supply 24 V/1 A DC (output), 115/230 V AC voltage supply535 282

Mounting and Fixing Technology

DescriptionArticle-Number
Wall mounting flange, stainless steel, clamping ring PTFE520 181
Wall mounting bracket, material aluminium anodized503 895
Mounting flange, stainless steel 1.4404551 740
Compresson fitting, stainless steel G½, atmospheric pressure532 160
Welding sleeve, stainless steel 1.4571, G½, according to EN 10241, 2 pieces524 882
Assembly kit for pipe assembly, suitable for MD 10.010/10.015, including pipe clamps and collar for adjustment for the pipe diameter531 394

Measured Value Display

DescriptionArticle-Number
SCHMIDT® LED display MD 10.010; in the wall housing to visualize the volumetric flow and the flow velocity (or other measures), 85…250 V AC and sensor supply527 320
SCHMIDT® LED display MD 10.010; as with 527 320 but with 24 V DC voltage supply528 240
SCHMIDT® LED display MD 10.015; in the wall housing to visualize the volumetric flow and the flow velocity (or other measures), with additional sum function and second measuring input, 85 … 250 V AC and sensor supply527 330
SCHMIDT® LED display MD 10.015; as with 527 330 but with 24 V DC voltage supply528 250

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