SCHMIDT® Flow Sensor SS 23.700 Ex Biogas

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 of 250 or 600 mm
  • Remote sensor (optional)
  • Measuring ranges 0 … 10 m/s up to 0 … 220 m/s, special measuring range
  • Special gas adjustment for biogas
  • Pulse output
  • PWIS-conform (optional)
  • Pressure resistant up to 16 bar
  • Temperature range from -20 °C up to +120 °C
  • ATEX :

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

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

 

The SCHMIDT® Flow Sensor SS 23.700 Ex Biogas is the perfect solution for the extremely demanding measurement in biogas applications.

 

The order option "PWIS-conform" provides the required safety for applications with corresponding requirements.

 

The double-pin sensor head has been designed especially to meet the needs of so-called „heavy-duty applications“. 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 23.700 Ex Biogas records flow velocity as well as media temperatures from -20 °C up to +120 °C. It can be used in small tubes from DN40 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 bar.

 

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 23.700 Ex Biogas operates without any moving parts and due to the measuring principle drifting 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“.

 

The SCHMIDT® SS 23.700 Biogas especially adjustet for the use in biogas / sewage treatment plants.

 

  • Industrial processes
  • Waste handling technology
  • Biogas productioin

 

For calculations of measuring range with our flow calculator, please use settings for SS 20.600.

 

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 mediumBiogas, optional: methane, natural gas, ; special gases and mixtures and others (on request)
Measuring range wN0 … 10 / 20 / 60 / 90 / 140 / 220 m/s
Optional: Customised measuring ranges in steps of 1 m/s
Lower detection limit wN0.1 m/s
Measuring range TM-20 … +120 °C
Measuring accuracy
Standard wN±(3 % of measured value + [0.4 % of fmr; min. 0.08 m/s]) 2)
Response time (t90) wN10 s (jump of wN from 0 to 5 m/s in air)
TM (wN > 2 m/s)±1 K (10 … 30 °C); ±2 K (remaining measuring range)
Operating temperature
Sensor probe-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 (of remote sensor)Jacket TPE, halogen-free
Compression fittingStainless steel 1.4571, FKM (depending on version)
General data
HumidityMeasuring mode: Non-condensing (< 95 % RH)
Operating pressure (max.)16 bar
Display4 x Duo-LEDs (green/red/orange)
Supply voltage24 V DC ± 20 %
Current consumptionTyp. 80 mA (without pulse outputs); max. 250 mA (excluding signal current of pulse output 2 [relay])
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
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 (PNP, open collector) at protected supply voltage; not galvanically isolated)
Short-circuit protected (analog): 100 mA
High level: > supply voltage - 3 V
Leckage current: IOFF < 10 µA
2. Semiconductor relay; output galvanically isolated
Output voltage/current: 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 (exception: Temperature element may never be placed “above” heater element)
Mounting tolerance±3° relative to flow direction (unidirectional)
Minimum immersion depthDN40
Protection typeSensor probe: IP67; enclosure: IP66; electrical connector: IP67 (with correctly attached cable)
Protection classIII / PELV (EN 50178)
ATEX-DeclarationGas (zone 2): II 3G Ex ec ic IIC T4 Gc
Dust (zone 22): II 3D Ex ic tc T135°C Dc
Probe lengthCompact version: 250/600 mm
Remote version: Probe 250/600 mm; cable: 1 … 10 m (steps: 1 m)
WeightApprox. 500 g max. (without connection 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 23.700 Ex; output signal 4 … 20 mA and 0 … 10 V; impulse output, incl. pressure-tight stainless steel compression fitting; 16 bar overpressure569 700 -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     
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 Methan (max. 90 m/s)     3   
Standard adjustment with conversion factor for Biogas (60 % Methan, 40 % CO2, max. 35 m/s)     4   
Standard adjustment with conversion factor for CO2 (max. 60 m/s)     5   
Standard adjustment with conversion factor for Natural Gas (88 % CH4; max. 160 m/s)     7   
Standard adjustment with conversion factor for Argon (max. 100 m/s)     8   
Standard adjustment with conversion factor for special gases and mixtures     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  
Scope of applicationStandard application       1 
PWIS-conform (paint-wetting impairment substances), with pressure tight compression fitting stainless steel G1/2 with cutting sealing (only for C = 1)       3 
OverpressureOperating pressure DD: 00 (atmospheric) … 16 bar         00 … 16

1) Other gases on request.

For calculations of measuring range with our flow calculator, please use settings for SS 20.600.

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
Power supply unit: output 24 V / 1A DC, supply voltage 115/230 V AC (strip terminal)535 282

Mounting and fixing technology

DescriptionArticle-Number
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 MD 10.010 / 10.015, including pipe clamps and collar for adjustment to 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 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

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