Remove Electronic Sensor Assembly (Close); Thermal Mass Flow Sensor; Operation And Display Elements - TESTO 0699 6446 Series Instruction Manual

6 Operation
6.1.2
6.2
6.2.1
30
Remove electronic sensor assembly
(CLOSE)
•
Slowly and evenly turn the interchangeable fitting out of the pipeline
only by hand, without tools, (to the left) in the direction of the arrow
CLOSE.
•
Only when the interchangeable fitting is completely in the CLOSE
position does the O-ring seal off the electronic sensor assembly from the
pressurized line.
•
Slowly detach the top union nut from the head of the interchangeable
fitting. Slowly let the air escape and make sure that it was only a short
discharge pressure and that the interchangeable fitting is securely
sealed.
•
Completely remove the union nut and remove the electronic sensor
assembly by pulling it out upwards in a vertical position.
Take note of the sensitive sensor tip and use the protection cap for transpor-
tation and storage.

Thermal mass flow sensor

Familiarize yourself with the operation and programming of the electronic
sensor assembly. The electronic sensor assembly is calibrated ex factory
and provided with default settings for each nominal width. Changes can be
made only by the manufacturer.

Operation and display elements

The following picture shows the control and display unit of the electronic
sensor assembly from above.
The LED display with the °C marking cannot be activated.