SCHMIDT® Flow Sensor SS 23.400 ATEX
SCHMIDT® Flow Sensor SS 23.400 ATEX
SCHMIDT® Flow Sensor SS 23.400 ATEX
SCHMIDT® Flow Sensor SS 23.400 ATEX
SCHMIDT® Flow Sensor SS 23.400 ATEX
SCHMIDT® Flow Sensor SS 23.400 ATEX

SCHMIDT® Flow Sensor SS 23.400 ATEX

Thermal flow sensor for uni- or bidirectional measurement of flow rate of air and gases with simultaneous detection of the flow direction in an explosive atmosphere (Zone 2).

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Introduction Technical Data

SCHMIDT® Flow Sensor SS 23.400 ATEX

Thermal flow sensor for uni- or bidirectional measurement of flow rate of air and gases with simultaneous detection of the flow direction in an explosive atmosphere (Zone 2).

  • Thermopile head (very fast response time)
  • Flow velocity and switching signals
  • Probe length 130 … 300 mm
  • Measuring ranges 0 … 1 m/s to 0 … 20 m/s
  • Bidirectional measurement (optional)
  • Detection of flow direction (optional)
  • Sensor programming (optional)
  • Cleanroom sensor
  • Extremely compact (electronics is integrated in sensor tube)
  • Sensor element protected against mechanical stress
  • Linear analog output for measured flow velocity
  • Two switching outputs to signal flow direction and threshold
  • ATEX gases, zone 2: II 3G Ex nA IIC T4 Gc
  • Laminar flow monitoring in cleanrooms
  • Monitoring of overflow
  • Cooling air monitoring
  • Flow measurement in test benches
  • Mass and volume flow measurement

SCHMIDT Technology – Simply a question of better measurement

Technical data
Measuring quantity

Standard flow velocity wN based on standard conditions
Measured medium Clean air or nitrogen, additional gases on request
Measuring range wN (±)0 … 1 / 2.5 / 5 / 10 / 20 m/s (uni- or bidirectional)
Lower detection limit wN (±)0.05 m/s
 

Measuring accuracy
Standard wN ±(3 % of measured value + [2 % of fmr; min. 0.05 m/s])
High precision (optional) wN ±(1 % of measured value + [2 % of fmr; min. 0.04 m/s])
Response time (t90) wN 1 s (configurable: 0.01 … 10 s)
 

Operating temperature
Sensor probe 0 … +60 °C
Storage temperature -20 … +85 °C
 

General data
Humidity Measuring mode: Non-condensing (< 95 % RH)
Operating pressure (max.) Atmospheric (700 … 1,300 hPa)
Supply voltage 12 … 26.4 V DC
Current consumption Typ. < 35 mA (max. 150 mA; including signal current of switching outputs)
Analog outputs wN  … 10 V (RL > 10 kΩ; CL ≤ 10 nF; short-circuit protected)
4 … 20 mA (RL < 300 Ω; CL ≤ 100 nF)
Switching outputs 2 x open collector (at GND), current-limited and short-circuit protected, configurable
-Channel 1 (OC1): Flow direction or threshold value
- Channel 2 (OC2): Threshold value
- External switching voltage / current: Max. 26.4 V DC / 55 mA (typ. 50 mA)
- Hysteresis: 5 % of threshold value (min. ±0.05 m/s)
Electrical connection Plug-in-connector M9, male, 7-pin (shielded), screwed
Maximum cable length Voltage interface: 15 m;
Current interface: 100 m
Mounting position Arbitrary
Protection type Sensor probe: IP66
Plug-in connection: IP67 (with correct attached cable)
Protection class III / PELV (EN 50178)
ATEX declaration Gas (zone 2): II 3G Ex nA IIC T4 Gc
Sensor length 130/200/300 mm
Weight Approx. 60 g max. (300 mm Sensor length)
 

Material
Sensor head Stainless steel 1.4404
Sensor tube Stainless steel 1.4404
Plug connector, nut screw Stainless steel 1.4404
 

Dowloads
Product brochure (02/2023) Dowload PDF
Instructions for use (514622.02H) Dowload PDF
3D-STP data Dowload
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