SCHMIDT® Flow Sensor SS 23.400 ATEX

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

 

Extremely compact, because electronics are integrated into the sensor tube. Sensor element in the chamber head and protected against mechanical stress. Linear analog output for measured value edition, two switching outputs to output the flow direction and the signal of threshold.

 

By installation into a measuring tube suitable for the measurement of the standard volume flow or mass flow.

 

  • Laminar flow monitoring in cleanrooms
  • Monitoring of the overflow
  • Cooling air monitoring
  • Flow measurement in test benches
  • Mass and volume flow measurement
  • Use in potentially explosive atmospheres caused by gases (zone 2)

Specifications

Technical Data
Measurement quantity wNStandard flow velocity wN, based on standard conditions of TN = 20 °C and pN = 1,013.25 hPa
Measured mediumClean air, nitrogen, additional gases on request
Measurement range wN0 … 1 / 2.5 / 5 / 10 / 20 m/s
Lower detection limit wN0.05 m/s
Measurement accuracy
Default wN± 3 % of measured value + (2 % of measurement range; min. 0.05 m/s)
High precision (Option) wN± 1 % of measured value + (2 % of measurement range; min. 0.04 m/s)
Repeatability wN± 1.5 % of measured value
Response time (t90) wN1 s (configurable: 0.01 … 10 s)
Operating temperature
Operating temperature0 … +60 °C
Storage temperature-20 … +85 °C
Material
Sensor headStainless steel 1.4404
Sensor probeStainless steel 1.4404
Plug-in connectorStainless steel 1.4404
General data
HumidityNon-condensing (≤ 95 % rH)
Operating pressureAtmospheric (700 … 1,300 hPa)
Supply voltage12 … 26.4 V DC
Current consumptionTypical < 35 mA (max. 150 mA; including signal current of switching outputs)
Analog output wN0 … 10 V (RL > 10 kΩ; CL ≤ 10 nF; short-circuit protected)
4 … 20 mA (RL < 300 Ω; CL ≤ 100 nF)
Switching outputs2 x low-side driver (open collector at GND), current-limited and short-circuit protected, configurable
Channel 1 (OC): Direction or threshold value; Channel 2 (OC2): Threshold value
External switching voltage / current: Max. 26.4 V DC / 55 mA (typ. 50 mA)
Switching hysteresis: 5 % of threshold value, min. ± 0.05 m/s
Electrical connectionPlug-in-connector M9, male, 7-pin (shielded), screwed
Maximum line lengthVoltage interface: 15 m; current interface: 100 m
Mounting positionArbitrary
Protection type / classIP66 / III or PELV (EN 50178)
ATEX-Type (Option)3G, Zone 2 (II 3G Ex nA IIC T4)
Sensor length130 / 200 / 300 mm
WeightApprox. 60 g max. (300 mm Sensor length)

Subject to technical changes

Order information

 DescriptionArticle-Number
Basic sensorSCHMIDT® Flow Sensor SS 23.400 ATEX, version as thermopile head, with ATEX* category 3G, zone 2)513 970 -XYDZR4P
 Options
Mechanical TypSensor length 130 mm (only with 0 … 10 V output available) 1      
Sensor length 200 mm 2      
Sensor length 300 mm 3      
Measurement rangeMeasurement range 0 … 1 m/s  1     
Measurement range 0 … 2.5 m/s  2     
Measurement range 0 … 5 m/s  3     
Measurement range 0 … 10 m/s  4     
Measurement range 0 … 20 m/s  5     
Measurement direction, adjustment accuracy and calibrationUnidirectional – standard adjustment   1    
Unidirectional – standard adjustment with factory calibration certificate   6    
Bidirectional – standard adjustment   2    
Bidirectional – standard adjustment with factory calibration certificate   7    
Unidirectional – high precision adjustment incl. factory calibration certificate   3    
Bidirectional – high precision adjustment incl. factory calibration certificate   4    
Unidirectional – vertical flow high precision adjustment with factory calibration certificate (only for measuring range 1 m/s)   5    
Output signals0 … 10 V    1   
4 … 20 mA (not for length 130 mm)    5   
Direction representationBidirectional: switching output OC 1     1  
Bidirectional: halved analog signal (0 m/s = 12 mA / 5 V)     2  
Unidirectional     3  
Sensor programmingFactory setting       S
Customer-specific programming       K

* Use of the sensor in the ATEX zone only in conjunction with the original connecting cable 535 279

Accessories

Connection Technology

DescriptionArticle-Number
Connection cable with coupler socket, 5 m length, open cable ends, material PUR535 279
Power supply 24 V DC output, 115/ 230 V AC voltage supply535 282

Mounting and Fixing Technology

DescriptionArticle-Number
Wall mounting flange (stainless steel 1.4571)520 181
Through-bolt joint stainless steel G½, atmospheric pressure532 160
Wall mounting bracket (aluminium, anodized)503 895
Mounting flange stainless steel 1.4404551 740
Assembly kit for tube connection for MD 10.010 / 10.015, with hose clamps and band to adapt it to the tube’s diameter531 394

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

Miscellaneous

DescriptionArticle-Number
Measuring Section Calibrator set (8 / 12 / 16 mA)546 741 - 4

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