SCHMIDT® Flow Sensor SS 20.500

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

 

  • Dumb-bell head (independent from 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
  • Coating optional
  • Pressure resistant up to 10 bar
  • ATEX gases, zone 2: II 3G Ex ec ic IIC T4 Gc (optional)
  • ATEX dust, zone 22: II 3D Ex tc ic IIIC T135°C Dc (optional)

 

To measure air and gas flows accurately and reproducibly, many parameters have to be correct. It is important how the gas flows against the sensor, and thus the positioning of the sensor often decides about the quality of the 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.

 

SCHMIDT® Technology - simply a question of better measurement

Specifications

Technical data
Measuring quantityStandard flow velocity wN, based on standard conditions 1)
Temperature of medium TM
Measured mediumAir, nitrogen, other gases on request
Measuring range flow wN0 … 1 / 2.5 / 5 / 10 / 20 / 35 / 50 m/s
Lower detection limit flow wN0.06 m/s
Measuring range temperature TM-40 … +85 °C
Measuring accuracy
Standard wN± (3 % of measured value + [0.4 % of fmr; min. 0.02 m/s]) 1)
High precision (optional) wN± (1 % of measured value + [0.4 % of fmr; min. 0.02 m/s]) 1)
Response time (t90) wN3 s (jump from 0 to 5 m/s in air)
Temperature gradient wN≤ 2 K/min at 5 m/s
Temperature TM (wN > 1 m/s)± 1 K (10 … 30 °C);
±2 K (remaining measuring range)
Operating temperature
Sensor-40 … +85 °C
Electronics-20 … +70 °C
Storage temperature-40 … +85 °C
Material
HousingAluminium, anodised
Sensor tubeStainless steel 1.4571
Sensor headPBT fibre-glass reinforced, stainless steel 1.4571
Protective coating (optional)Polyurethane derivate / parylene
Protective sleeve (ATEX option)Aluminium, anodised
Sensor cable (remote sensor)(PUR, halogenfree, UL)
General data
HumidityMeasuring mode: Non-condensing (< 95 % RH)
Operating pressure (max.)Compact version: 0 … 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 consumptionTypical < 60 mA (max. 170 mA)
Analog outputs (wN, TM)Auto-U/I: 0 … 10 V / 4 … 20 mA (signal characteristic depends on RL)
Voltage output: RL ≥ 550 Ω (short-circuit protected)
Current output: RL ≤ 500 Ω
Change-over hysteresis: 50 Ω
CL ≤ 10 nF
Electrical connectionPlug-in connector M12 (A-coded), male, 5-pin, screwed
Maximum cable lengthVoltage interface: 15 m;
Current interface: 100 m
Mounting positionArbitrary
Minimum immersion depth58 mm (< 58 mm on request)
Protection type / classIP67 (sensor head); IP65 (housing) / III or PELV (EN 50178)
ATEX categoryII 3D Ex tc ic IIIC T135°C Dc
II 3G Ex ec ic IIC T4 Gc
Probe lengthCompact version: 100 … 1000 mm
Remote version: 100 / 150 / 350 mm
Weight400 g max. (without connecting cable)

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 20.500; 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   2  
High precision adjustment 4 … 20 mA including factory calibration certificate   4  
Protection typeWithout protective coating    1 
With protective coating polyurethane derivate    2 
With protective coating parylene    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 5-pin, length 5 m, with coupler socket and open cable ends523 565
Connection cable 5-pin, selectable length (2 … 100 m; 1-m-steps), with coupler socket and 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 24 V DC output, supply voltage 115/230 V AC535 282

Mounting and fixing technology

DescriptionArticle-Number
Mounting flange made of galvanized steel301 048
Mounting flange made of 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 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 … 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
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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