SCHMIDT® Flow Sensor SS 23.700 Ex Biogas
SCHMIDT® Flow Sensor SS 23.700 Ex Biogas
SCHMIDT® Flow Sensor SS 23.700 Ex Biogas
SCHMIDT® Flow Sensor SS 23.700 Ex Biogas
SCHMIDT® Flow Sensor SS 23.700 Ex Biogas
SCHMIDT® Flow Sensor SS 23.700 Ex Biogas

SCHMIDT® Flow Sensor SS 23.700 Ex Biogas

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

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Introduction Technical Data

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

Technical data
Measuring quantity

Standard flow velocity wN based on standard conditions

Temperature of medium TM
Measured medium Biogas, optional: methane, natural gas, ; special gases and mixtures and others (on request)
Measuring range wN 0 … 10 / 20 / 60 / 90 / 140 / 220 m/s
Optional: Customised measuring ranges in steps of 1 m/s
Lower detection limit wN 0.1 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])
TM (wN > 2 m/s) ±1 K (10 … 30 °C); ±2 K (remaining measuring range)
Response time (t90) wN 10 s (jump of wN from 0 to 5 m/s in air)
 

Operating temperature
Sensor probe -20 … +120 °C
Electronics -20 … +70 °C
Storage temperature -20 … +85 °C
 

General data
Humidity Measuring mode: Non-condensing (< 95 % RH)
Operating pressure (max.) 16 bar
Display 4 x Duo-LEDs (green/red/orange)
Supply voltage 24 V DC ± 20 %
Current consumption Typ. 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: Signalization Frequency: 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: Technology 1. 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 connection Plug-in connector M12 (A-coded), male, 8-pin (shielded), screwed
Maximum cable length Voltage interface: 15 m
Current interface (pulse output): 100 m
Mounting position Arbitrary (exception: Temperature element may never be placed “above” heater element)
Mounting tolerance ±3° relative to flow direction (unidirectional)
Minimum immersion depth DN40
Protection type Sensor probe: IP67; enclosure: IP66; electrical connector: IP67 (with correctly attached cable)
Protection class III / PELV (EN 50178)
ATEX-Declaration Gas (zone 2): II 3G Ex ec ic IIC T4 Gc
Dust (zone 22): II 3D Ex ic tc T135°C Dc
Sensor length Compact version: 250/600 mm
Remote version: Probe 250/600 mm; cable: 1 … 10 m (steps: 1 m)
Weight Approx. 500 g max. (without connection cable)
 

Material
Housing Aluminium, anodised
Sensor head Stainless steel 1.4404
Sensor tube Stainless steel 1.4571
Sensor cable (of remote sensor) Jacket TPE, halogen-free
Compression fitting Stainless steel 1.4571, FKM (depending on version)
 

Dowloads
Product brochure (04/2024) Dowload PDF
Instructions for use (570454.02A) Dowload PDF
3D-STP data (250 mm) Dowload
3D-STP data (600 mm) Dowload
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SCHMIDT® Flow Sensor SS 20.600 (Biogas)
SCHMIDT® Flow Sensor SS 20.600 (Biogas)

Flow rates of gases - an important measurand in biogas plants