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Home/Sensors/Compressed air/SCHMIDT® Flow Sensor SS 20.600

SCHMIDT® Flow Sensor SS 20.600

Flow rates of gases – an important measurement in industrial processes.

 

  • Chamber head (fast response time)
  • Flow and temperature signal
  • Probe length 120 … 1,000 mm (optional special length)
  • Remote sensor (optional)
  • Measuring ranges 0 … 10 m/s to 0 … 220 m/s, special measuring range
  • Special gas adjustment for different gases (optional)
  • Pulse output
  • Profi-BUS DP-V0 and DeviceNet (optional)
  • ATEX gases, zone 2: II 3G Ex nA ic IIC T4 Gc (optional)
  • Grease free / O2 applications (optional)
  • Pressure resistant up to 40 bar
  • Temperature range +120 °C

 

The detection of flow rates in industrial processes is an important measure to save energy, secure quality assurance in the production process, recording or distribution of costs, and much more.

 

The thermal SCHMIDT® Flow Sensor SS 20.600 is the rugged solution for demanding industrial applications. It can be used for different applications such as compressed air monitoring, gas monitoring for process burners, metering of gases and much more.

 

  • Compressed air consumption measurement
  • Inert gas flow measurement
  • Flow rate control
  • Compressor control
  • Exhaust air monitoring
  • Control of the combustion air at block heating plants and fuel cells
  • Air mass flow measurement in burners and combustion engines

 

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
Optional: Natural gas, biogas, CO2, special gases and gas mixtures
Measuring range wN0 … 10 / 20 / 60 / 90 / 140 / 220 m/s
Optional: Customised measuring ranges in 0.1 m/s steps
Lower detection limit wN0.2 m/s
Measuring range temperature TMSS 20.600: -20 … +120 °C
SS 20.600 Ex: -40 … +120 °C
Measuring accuracy
Standard wN± (3 % of measured value + [0.4 % of fmr; min. 0.08 m/s]) 1)
High precision wN
(optional for air, nitrogen, oxygen only)		± (1 % of measured value + [0.4 % of fmr; min. 0.08 m/s]) 1)
Response time (t90) wN1 s (jump of wN from 0 to 5 m/s in air)
Temperature gradient wN< 8 K/min (at wN = 5 m/s in air)
Temperature TM (wN > 5 m/s)± 1 K (10 … 30 °C);
± 2 K (in remaining measuring range)
Operating temperature
SensorSS 20.600: -20 … +120 °C
SS 20.600 Ex: -40 … +120 °C
Electronics-20 … +70 °C
Storage temperature-20 … +85 °C
Material
HousingAluminium, anodised
Sensor tubeStainless steel 1.4571
Sensor headPlatinum resistor element (glass-passivated), PPO / PA
Protective sleeve (ATEX option)Aluminium, anodised
Sensor cable
(remote sensor)		Jacket (PUR, halogen free, UL)
Compression fittingStainless steel 1.4571 or brass (depending on sensor option)
General data
HumidityMeasuring mode: Non-condensing (< 95 % RH)
Operating pressure (max.)0 … 16 / 40 bar (optional)
Display4 x Duo-LEDs (green / red / orange)
Supply voltage24 V DC ± 20 %
Current consumptionTypical 50 mA (without pulse outputs); max. 250 mA (including signal current of all outputs)
Analog outputs for wN and TM
(type: Auto U / I)		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
Pulse outputs: SignalizationFrequency: wN ~ f = 0 … fmax; fmax = 10 … 100 Hz
Optional: 1 pulse/1 m3; 1 pulse/0.1 m3; 1 pulse/0.01 m3 (max. 100 pulses/s)
Pulse outputs: Technology1. Highside-driver (open collector at protected supply voltage; not galvanically isolated)
High level: > supply voltage - 3 V
2. Semiconductor relay (galvanically isolated), max. 30 V / 50 mA
Electrical connectionPlug-in connector M12 (A-coded), male, 8-pin (shielded), screwed
Maximum cable lengthVoltage interface: 15 m
Current interface (pulse output): 100 m
Mounting positionArbitrary (with vertical downdraft: lower detection limit = 2 m/s at 16 bar)
Mounting tolerance± 3° relative to flow direction
Minimum immersion depthDN 25
Protection type / classIP67 (probe); IP65 (housing) / III or PELV (EN 50178)
ATEX categoryII 3G Ex nA ic IIC T4 Gc
Probe lengthCompact version: 120 / 250 / 400 / 600 mm / Special lengths from 120 to 1,000 mm
Remote version: Probe 120 / 250 / 400 / 600 mm
Remote cable: 1 … 10 m (in steps from 1 m)
WeightApprox. 500 g max. (without connection cable)

1) based on standard conditions: 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 20.600; output signal 4 … 20 mA and 0 … 10 V; impulse output, incl. pressure-tight stainless steel compression fitting524 600 -ABCDEFGHPP
 Options
Mechanical typeSensor length 120 mm 1        
Sensor length 250 mm 2        
Sensor length 400 mm 3        
Sensor length 600 mm 4        
Special sensor lengths: > 120 mm ... 1,000 mm, 10 mm steps 8        
Remote version (selectable sensor length):
120 / 250 / 400 / 600 mm
cable length: ____ m (1 … 10 m; 1-m-steps)		 9        
Pressure-tight compression fitting, stainless steel G½  1       
Pressure-tight compression fitting, stainless steel R½ (PT)  2       
Measuring ranges and adjustmentMeasuring range 0 … 10 m/s   1      
Measuring range 0 … 20 m/s   2      
Measuring range 0 … 60 m/s   3      
Measuring range 0 … 90 m/s   4      
Measuring range 0 … 140 m/s   5      
Measuring range 0 … 220 m/s   6      
Special measuring range (10 … 220 m/s) in 0.1 m/s steps: ___ . ___ m/s   9      
Standard adjustment    1     
Standard adjustment with factory calibration certificate    0     
High-precision adjustment incl. factory calibration certificate    2     
Standard adjustment with conversion factor for methane 1)    3     
Standard adjustment with conversion factor for biogas (60 % methane, 40 % CO2) 1)    4     
Standard adjustment with conversion factor for CO2 1)    5     
Standard adjustment with correction to natural gas with 88 % CH4 1)    7     
Standard adjustment with conversion factor for special gases and mixture 1)    9     
Impulse outputStandard 100 Hz (= final value of measuring range wN)     1    
1 impulse / 1 m3 for pipe diameter (round) _____ mm     2    
1 impulse / 0,1 m3 for pipe diameter (round) _____ mm     3    
1 impulse / 0,01 m3 for pipe diameter (round) _____ mm     4    
Additional outputsWithout communication module      1   
Communication module for DeviceNet, Profi-BUS DP-V0      2   
Protection type ATEXWithout ATEX design       1  
ATEX design 2)       2  
Protection typeStandard application        1 
Grease-free and for O2 > 21 % 1)        2 
OverpressureOperating pressure DD: 00 (atmospheric) … 16 bar         00 … 16
Operating pressure DD: 17 … 40 bar 1)         17 … 40

1) Not available with the option special lengths

2) Application of sensor in ATEX area only with original connection cable 524 921 or 524 942 and without communication modules

Accessories

Connection technology

DescriptionArticle-Number
Connecting cable, 8-pole, length 5 m, with coupler socket and open cable end524 921
Connection cable 8-pole, length can be selected (2 … 100 m; 1 m steps), free of halogen, with cable end sleeves 1)524 942
Coupler socket, 8-pole, with screw terminals, for cable ø 6 … 8 mm524 929
Adapter cable M12, 8/4 pole, length 8 cm550 885
Power supply unit 24 V DC535 282

Mounting and fixing technology

DescriptionArticle-Number
Compression fitting G½535 092
Compression fitting R½539 190
Welding sleeve steel G½ acc. to EN 10241, 5 pieces per pack524 916
Welding sleeve stainless steel 1.4571 G½, acc. to EN 10241, 2 pieces per pack524 882
Assembly kit for pipe assembly, suitable for 10.010 / 10.015, including pipe clamps and collar for adjustment to the pipe diameter531 394
Probe ball value 1" inside thread, connection to flow sensor: ½" inside thread incl. plug and chain530 940
Probe ball value 1 ¼" inside thread, connection to flow sensor: ½" inside thread incl. plug and chain530 941
Probe ball value 1 ½" inside thread, connection to flow sensor: ½" inside thread incl. plug and chain530 942
Probe ball value 2" inside thread, connection to flow sensor: ½" inside thread incl. plug and chain530 943
Straight-run probe ball valve ¾" inside thread, with threaded adapter for ½" full-length screw connection532 355
Welded socket, steel, outside thread ¾", 5 pieces per pack531 200
Welded socket, stainless steel, outside thread ¾", 2 pieces per pack531 201

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

1) Application of sensor in ATEX area only with original connection cable 524 921 or 524 942 and without communication modules

Downloads

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