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Home/Sensors/Plant construction / industrial processes/SCHMIDT® Flow Sensor SS 20.500

SCHMIDT® Flow Sensor SS 20.500

The solution for flow measurement – especially for dusty air and gases. High precision and compact!

 

  • Dumb-bell head (independent of flow direction, easy to clean)
  • Flow and temperature signal
  • Probe length 100 … 1,000 mm (optional special length)
  • Remote sensor (optional)
  • Measuring ranges 0 … 1 m/s to 0 … 50 m/s
  • Coatings (optional; sensor head only)
  • Pressure resistant up to 10 bar
  • ATEX (optional):

- Gases, zone 2: II 3G Ex ec ic IIC T4 Gc

- Dust, zone 22: II 3D Ex tc ic IIIC T135°C Dc

 

To measure air and gas flows accurately and reproducibly, many parameters have to be correct. Therefore, the positioning of the sensor decisively determines the quality of the measurement results.

The gases to be measured also determine the choice of the right sensor. In safety-relevant areas such as the chemical industry the requirement for explosion protection has also to be considered which means that the selection of a suitable sensor is very limited.

 

  • Industrial processes
  • Cleanroom and Pharma
  • Ventilation and air conditioning

 

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)
Temperature of medium TM
Measured mediumAir or nitrogen, other gases on request
Measuring range wN0 … 1 / 2.5 / 5 / 10 / 20 / 35 / 50 m/s
Lower detection limit wN0.06 m/s
Measuring range TM-40 … +85 °C
Measuring accuracy
Standard wN±(3 % of measured value + [0.4 % of fmr; min. 0.02 m/s]) 2)
High precision (optional) wN±(1 % of measured value + [0.4 % of fmr; min. 0.02 m/s]) 2) (only for measuring range 0 … 1 m/s)
Response time (t90) wN3 s (jump from 0 to 5 m/s in air)
Temperature gradient wN≤ 2 K/min (at wN = 5 m/s in air)
TM (wN > 1 m/s)±1 K (10 … 30 °C); ±2 K (remaining measuring range)
Operating temperature
Sensor probe-40 … +85 °C
Electronics-20 … +70 °C
Storage temperature-40 … +85 °C
Material
EnclosureAluminium, anodised
Sensor tubeStainless steel 1.4404
Sensor headPBT (glass-fibre reinforced), stainless steel 1.4404
Protective coating (optional; sensor head only)Polyurethane derivate (black) / parylene (transparent)
Protective sleeve (ATEX option)Aluminium, anodised
Sensor cable (of remote sensor)(TPE, halogenfree, black)
General data
HumidityMeasuring mode: Non-condensing (< 95 % RH)
Operating pressure (max.)Compact version: 10 bar (overpressure)
Remote version: Atmospheric (700 hPa … 1,300 hPa)
Display4 x Duo-LEDs (green/red/orange)
Supply voltage24 V AC/DC ± 20 %
Current consumptionTyp. < 60 mA (max. 170 mA)
Analog outputs
Type: Auto U / I)		wN, TM
0 … 10 V / 4 … 20 mA (switching of signal characteristic depends on RL)
-Voltage output (0 … 10 V): RL ≥ 550 Ω (short-circuit protected)
- Current output (4 … 20 mA): RL ≤ 500 Ω
- Change-over hysteresis: 50 Ω
- CL ≤ 10 nF
Electrical connectionPlug-in connector M12 (A-coded), male, 5-pin, screwed
ATEX approval only in combination with original cable!
Maximum cable lengthVoltage interface: 15 m; current interface: 100 m
Mounting positionArbitrary
Minimum immersion depth58 mm (< 58 mm on request)
Protection typeSensor probe: IP67; enclosure: IP65; electrical connector: IP67 (with correctly attached cable)
Protection classIII (SELV) or PELV (EN 50178)
ATEX categoryGas (zone 2): II 3G Ex ec ic IIC T4 Gc
Dust (zone 22): II 3D Ex tc ic IIIC T135°C Dc
Probe lengthCompact version: 100/150/350 mm; special length: >100 … 1000 mm (step: 10 mm)
Remote version: 161 mm (probe); cable length: 3 m or special length 1 … 30 m (step: 1 m)
Weight400 g max. (without connecting cable)

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 20.500; 2 x output signal 4 … 20 mA and 0 … 10 V521 501 -XYZPA
 Options
Mechanical typeSensor length 100 mm 1    
Sensor length 150 mm 2    
Sensor length 350 mm 3    
Special sensor length: >100 … 1,000 mm; 10 mm steps 9    
Remote sensor with 3 m cable 4    
Remote sensor with special cable length: _____ m (1 ... 30 m; 1 m steps) 5    
Measuring ranges and calibrationMeasuring range 0 … 1 m/s  1   
Measuring range 0 … 2.5 m/s  6   
Measuring range 0 … 5 m/s  2   
Measuring range 0 … 10 m/s  3   
Measuring range 0 … 20 m/s  4   
Measuring range 0 … 35 m/s  5   
Measuring range 0 … 50 m/s  7   
Standard adjustment   1  
Standard adjustment with factory calibration certificate   5  
Standard adjustment 4 … 20 mA   3  
Standard adjustment with factory calibration certificate 4 … 20 mA   6  
High precision adjustment including factory calibration certificate (only for Y=1 [0 … 1 m/s])   2  
High precision adjustment 4 … 20 mA including factory calibration certificate (only for Y=1 [0 … 1 m/s])   4  
Protection typeWithout protective coating    1 
With protective coating polyurethane derivate black (sensor head only)    2 
With protective coating parylene transparent (sensor head only)    5 
Without ATEX design (SS 20.500)     1
ATEX-design (SS 20.500 Ex) 1)     2

1) Application of sensor in ATEX area only with original connection cable 523 565 or 523 566

Accessories

Connection technology

DescriptionArticle-Number
Connection cable with coupler socket, 5-pin, length 5 m, open cable ends523 565
Connection cable with coupler socket, 5-pin, selectable length (2 … 100 m; 1-m-steps), cable end sleeves, halogen free523 566
Coupler socket, 5-pin, with screw type terminals for cable of ø = 4 … 6 mm523 562
Power supply unit: output 24 V / 1A DC, supply voltage 115/230 V AC (strip terminal)535 282

Mounting and fixing technology

DescriptionArticle-Number
Mounting flange, galvanized steel301 048
Mounting flange, stainless steel520 181
Compression fitting, stainless steel, G½, atmospheric pressure532 160
Compression fitting, brass, G½, atmospheric pressure517 206
Compression fitting, brass, G½, max. 10 bar, with protection against pressure losses524 891
Compression fitting, stainless steel, G½, max. 10 bar, with protection against pressure losses524 919
Welding sleeve, steel, G½, according to EN 10241, 5 pieces524 916
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 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
Attachable protective clip for dumbbell head against mechanical influences, stainless steel531 026
Attachable protective 2-wires-clip for protection against mechanical influences,
stainless steel, H2O2-resistant		559 124

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