SCHMIDT® Flow Sensor SS 23.700 Ex

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

SCHMIDT® Flow Sensor SS 23.700 Ex

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 different gases (optional)
  • Pulse output
  • PWIS-conform (optional)
  • Pressure resistant up to 16 bar
  • Temperature range from -20 °C up to +120 °C
  • ATEX (optional):

- 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 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.

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 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 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“.

  • 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

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 Air or nitrogen
Optional: biogas, methane, natural gas, argon, CO2, 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 (overpressure)
Display 4 x Duo-LED (green/red/orange)
Supply voltage 24 V DC ± 20 %
Current consumption Typical 80 mA (without pulse outputs); max. 200 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
ATEX approval only in combination with original cable!
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 IIIC T135°C Dc
Sensor length Compact version: 250/600 mm
Remote version: Probe 250/600 mm; cable: 1 … 10 m (step: 1 m)
Weight Approx. 500 g max.
 

Material

Housing Aluminium, anodised
Sensor head Stainless steel 1.4404
Sensor tube Stainless steel 1.4571
Sensor cable
(remote sensor)
Jacket TPE, halogen-free
Compression fitting Stainless steel 1.4571, FKM (standard version)
PWIS-konform: Stainless steel 1.4571
 

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 20.700
SCHMIDT® Flow Sensor SS 20.700

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