User's Manual

1 Contents
3
1 Contents
1 Contents ................................................................................................... 3
2 Safety and the environment .................................................................... 4
2.1. About this document ........................................................................ 4
2.2. Ensure safety................................................................................... 5
2.3. Protecting the environment .............................................................. 5
3 Specifications .......................................................................................... 5
3.1. Use .................................................................................................. 6
3.2. Technical data ................................................................................. 6
3.2.1. Bluetooth module ................................................................................................ 6
3.2.2. General technical data ........................................................................................ 7
4 Product description ............................................................................... 10
4.1. Overview ....................................................................................... 10
4.1.1. Measurement setup ..........................................................................................10
4.1.2. Overview of testo 420 .......................................................................................11
5 First steps .............................................................................................. 13
6 Using the product .................................................................................. 15
6.1. Switching Bluetooth® on and off.................................................... 15
6.2. Settings for the measurement........................................................ 15
6.2.1. Damping (gliding average) ................................................................................15
6.2.2. Hood calibration ................................................................................................16
6.2.3. Zeroing interval (automatic zeroing) .................................................................16
6.3. Volume flow measurement setup .................................................. 17
6.4. Measuring ...................................................................................... 20
6.4.1. Volume flow measurement ...............................................................................20
6.4.2. Pitot tube measurement ....................................................................................20
6.4.3. Differential pressure measurement...................................................................20
6.5. Saving ........................................................................................... 21
6.6. Transferring measurement data to the PC .................................... 22
7 Maintaining the product ........................................................................ 22
7.1. Cleaning the instrument ................................................................. 22
8 Tips and assistance............................................................................... 22
8.1. Questions and answers ................................................................. 22
8.2. Error messages ............................................................................. 22
8.3. Accessories and spare parts ......................................................... 23
9 EC Declaration of Conformity ............................................................... 24