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Testo Smart Probes
Page 13 last saved: 2021-12-31
Chapter 4 Operation principle
4.1 App operation principle
App which install in smart phone shall be received and display measurement value from Smart
probes when it’s opening via Bluetooth. Customer also can configure units or other parameters
by App.
4.2 testo 405i operation principle
testo 405i has a NTC sensor, which shall change resistant value related ambient temperature.
Circuit is response for detect NTC’s resistant and calculate ambient temperature through NTC’s
feature by MCU ..
Then MCU control the Bluetooth module to send data to smart phone via Bluetooth and also
received parameter changed and action protocol from smart phone.
Key is use for start ,stop and hold value.
Led is use for indicate status of device.
Red : warning, such as low battery level
Yellow: finding App in smart phone via Bluetooth
Green: communication success.
4.3 testo 410i operation principle
testo 410i has a vane, which can recognize flow velocity by vane’s speed of revolution. Speed’s
analog signal from vane can transform to digital signal for MCU deal.
Then MCU control the Bluetooth module to send data to smart phone via Bluetooth and also
received parameter changed and action protocol from smart phone.
Key is use for start ,stop and hold value.
Led is use for indicate status of device.
Red : warning, such as low battery level
Yellow: finding App in smart phone via Bluetooth
Green: communication success.