SCHMIDT® Bluetooth® Verification Probe SS 20.450

Verify flow sensors on site


  • Simple, fast and safe verification of installed sensors – mobile on site
  • Easy-Clamp-On installation
  • Plug-and-Play
  • No additional power supply required
  • Radio module with Bluetooth® technology for transmission of the standard flow rate wN
  • Display and real-time recording of the measured values via free SCHMIDT® Sensor App on a mobile Android end device – wireless, anytime and anywhere
  • Probe length 150 mm
  • Measuring ranges 0 … 1 m/s to 0 … 20 m/s
  • Cleanroom sensor


Particularly in cleanrooms or in clean processes, installed flow sensors should be verified on site from time to time. This can now be realised in the simplest way with the SCHMIDT® Bluetooth® Verification Probe SS 20.450.


The installed SCHMIDT® flow sensor remains in place while the Verification Probe is simply attached to it using the metal clip supplied. The Verification Probe has a self-sufficient power supply and can therefore be operated completely wirelessly for up to 8 hours.


This makes it possible to check the sensor without having to remove it from the clean area and then clean it at great expense. The system operator can now verify the sensor with his SCHMIDT® Sensor App installed on the mobile Android device, which displaysthe real-time measurements graphically on the smartphone or tablet and record the values (data logger function).


SCHMIDT® smart solutions mit Bluetooth® Technologie


Scope of delivery:

  • SCHMIDT® Bluetooth® Verification Probe SS 20.450
  • SCHMIDT® Bluetooth® Modul BT 10.450
  • Easy-Clamp-On clip (made of stainless steel)
  • Batteries LR44
  • Instruction manual
  • Calibration certificate
  • Certificate of compliance
  • Storage case


SCHMIDT Technology – Simply a question of better measurement


Technical data
Additionally required deviceMobile device, e.g. smartphone, tablet
System requirements:
- Android® version 7.0 or higher
- Bluetooth® version LE (4.0) or higher
For use of full functionality of the SCHMIDT® Sensor App for Android an active internet connection is required.
Bluetooth® RangeMax. 50 m (free field; less in buildings)
Display and recordingStandard flow velocity wN
über kostenfreie SCHMIDT® Sensor App
Measuring quantityStandard flow velocity wN of air based on standard conditions 1)
Measured mediumClean air
Measuring range wN0 … 1 / 5 / 10 / 20 m/s
Lower detection limit wN0.05 m/s
Measuring accuracy
Measuring accuracy at wN range of 1 m/s±(1 % of measured value + 0.025 m/s) 2)
Measuring accuracy at wN range of 5/10/20 m/s±(2 % of measured value + 0.8 % of fmr) 2)
Response time (t90) wN5 s
Operating temperature
Sensor0 … +60 °C
Storage temperature-20 … +85 °C
General data
HumidityMeasuring mode: Non-condensing (< 95 % RH)
Operating pressureAtmospheric (700 … 1,300 hPa)
Power supplyIntegrated batteries (3 x LR44, changeable)
Protection typeIP65
Funkmodul: L = 90 mm; Ø 18 mm
Protection classIII (SELV) or PELV (EN 50178)
DimensionsSensor: L = 150/193 mm; Ø 9/12 mm
BT-module: L = 93 mm; Ø 18 mm
Weight84 g (completed probe, incl. mounting bracket and batteries)
Sensor headPMMA, POM
Sensor tubeStainless steel 1.4404
Plug connector, nut screwStainless steel 1.4404

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® Bluetooth® Verification Probe SS 20.450 measuring range 0 … 1 m/s563 540 - 1
SCHMIDT® Bluetooth® Verification Probe SS 20.450 measuring range 0 … 5 m/s563 540 - 2
SCHMIDT® Bluetooth® Verification Probe SS 20.450 measuring range 0 … 10 m/s563 540 - 3
SCHMIDT® Bluetooth® Verification Probe SS 20.450 measuring range 0 … 20 m/s563 540 - 4


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