SCHMIDT® Flow Sensor SS 20.700

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

 

  • "Heavy-Duty applications"
  • Double-pin sensor head, sensor elements completely encapsulated in stainless steel
  • For air and other gases in applications with harsh conditions (medium with aggressive components, contamination, high humidity)
  • Flow and temperature signal
  • Probe length 250 or 600 mm
  • 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
  • Grease free / O2 applications / PWIS-free (optional)
  • Pressure resistant up to 16 bar
  • Temperature range +120 °C
  • Module interface for expansion of sensor functions

 

The thermal SCHMIDT® Flow Sensor SS 20.700 is the perfect solution for extremely demanding industrial applications. It can be used for a diverse range of applications, such as compressed air monitoring, gas monitoring on process burners, consumption recording of gases and a great deal more.

 

Two specific versions „Oxygen O2 >21 %" and „Grease-free and Oxygen O2 >21 % (PWIS-free)" provide the required safety for applications with corresponding requirements.

 

The double-pin sensor head has been designed precisely to meet the needs of so-called „heavy-duty applications“ and, thanks to the sensor elements being completely encapsulated in stainless steel these are ideally suited for extremely demanding applications. The sensor is also resistant against aggressive media.

 

The SS 20.700 records flow speed as well as media temperatures of up to 120 °C. It can be used in small tubes from DN 25 upwards and can involve a sensor length of up to 600 mm to measure the volumetric flow rate in large channels and ducts. The sensor can be used in overpressure up to 16 barg.

 

This sensor is very easy to install: screw in the sensor using the compression fitting included, align the sensor in the gas flow and centrally in the pipe, connect it electrically – and job done!

 

The SS 20.700 operates without any moving parts and due to the measuring principle drift or ageing do not play a role. This reduces the maintenance required for the sensor to an absolute minimum. Should cleaning nevertheless be necessary, it can be carried out very easily and in a variety of ways - simply the spirit of „heavy-duty“.

 

  • Heavy-Duty applications
  • 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

 

  • ** Available from September 2022 ***

 

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 or nitrogen
Optional: Pure oxygen, argon, CO2, other gases on request
Measuring range wN0 … 10 / 20 / 60 / 90 / 140 / 220 m/s
Optional: Customised measuring ranges in 1 m/s steps
Lower detection limit wN0.1 m/s
Measuring range temperature TM-20 … +120 °C
Measuring accuracy
Standard wN± (3 % of measured value + [0.4 % of fmr; min. 0.08 m/s]) 1)
Response time (t90) wN10 s (jump of wN from 0 to 5 m/s in air)
Temperature TM (wN > 5 m/s)± 1 K (10 … 30 °C);
± 2 K (in remaining measuring range)
Operating temperature
Sensor-20 … +120 °C
Electronics-20 … +70 °C
Storage temperature-20 … +85 °C
Material
HousingAluminium, anodised
Sensor tubeStainless steel 1.4571
Sensor headStainless steel 1.4404
Sensor cable
(remote sensor)
Jacket TPE, halogen free
Compression fittingStainless steel 1.4571, NBR (or FKM), depending on version
General data
HumidityMeasuring mode: Non-condensing (< 95 % RH)
Operating pressure (max.)0 … 16 bar
Display4 x Duo-LEDs (green / red / orange)
LED ring
Supply voltage24 V DC ± 20 %
Current consumptionTypical 80 mA (without pulse outputs); max. 200 mA (excluding signal current of pulse output 2 [relay])
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 connectionMain: Plug-in connector M12 (A-coded), male, 8-pin (shielded), screwed
Module interface: Plug-in connector M12 (A-coded), female, 5-pin (shielded), screwed
Maximum cable lengthVoltage interface: 15 m
Current interface (pulse output): 100 m
Mounting positionArbitrary (exception: Temperature element may never be placed “above” heater element)
Measuring direction / Mounting toleranceuni-directional / ± 3° relative to flow direction
Minimum immersion depthDN 25
Protection type / classIP67 (probe); IP66 (housing) / III or PELV (EN 50178)
Probe lengthCompact version: 250 / 600 mm
Remote version: Probe 250 / 600 mm
Remote cable: 1 … 10 m (in steps of 1 m)
WeightApprox. 500 g max. (without connection 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 20.700; output signal 4 … 20 mA and 0 … 10 V; impulse output, incl. pressure-tight stainless steel compression fitting; 16 bar overpressure562 140 -ABCDEFGDD
 Options
TypeStandard 1       
Mechanical typeSensor length 250 mm  1      
Sensor length 600 mm  2      
Remote version (selectable sensor length):
250 / 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     
Pressure-tight compression fitting, stainless steel G½ with cutting sealing   3     
Pressure-tight compression fitting, stainless steel R½ (PT) with cutting sealing   4     
Measuring ranges and adjustment1)Measuring 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 1 m/s steps: ___ . ___ m/s    9    
Standard adjustment     1   
Standard adjustment with factory calibration certificate     2   
Standard adjustment with conversion factor for CO2     5   
Standard adjustment with conversion factor for Argon     8   
Standard adjustment with conversion factor for special gases and mixture     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  
Protection typeStandard application       1 
Oxygen O2 > 21 %       2 
Grease-free and Oxygen O2 > 21 % (PWIS-free) only for C = 3 or 4)       3 
OverpressureOperating pressure DD: 00 (atmospheric) … 16 bar         00 … 16

1) Other gases on request.

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
Welding socket, steel, outside thread ¾", 5 pieces per pack531 200
Welding 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
Measuring value module MD 10.020, 7-Segment-Display, incl. 0.6 m connection cable to connect to the module plug554 900
SCHMIDT® Bluetooth® Module BT 10.010560 500
SCHMIDT® Sensor App (Android): free of charge download at "Service & Support" – SensorsDownload

Miscellaneous

DescriptionArticle-Number
SCHMIDT® PC Programming Kit; Adapter (USB / M12, 5-pole), USB stick (Sensor App PC, driver; for PC, laptop, notebook; Windows)564 710
SCHMIDT® Datalogger DL 10.010569 300

Downloads

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