TESTO 6740, Инструкция по эксплуатации, Страница: 21 / 28

6. Adjustment on site 21
Installation
1 Screw instrument testo 6743 (G1/2"process
connection) into the adjustment chamber (

).
2 Connect 2-pressure adjustment device (

) to the
compressed air pipe with the compressed air fast
coupling (diameter 7.2).
The permitted operating pressure is 3-16 bar.
Adjustment
1 Read off process pressure/system pressure P1,
e. g. from a manometer, and note value.
The manometer should be installed close to the
measurement site.
Take the pressure relationship P1/P2 from the
calibration certificate (page 2) based on the
process pressure. Linear interpolation (calculation)
is possible between the two values.
2 Open menu 2PA (see chapter 5 "Menu guide").
P1 and the relative humidity %rF at the pressure
level P1 are alternately displayed.
The measuring instrument testo 6743 requires
stable pressure values for the two-pressure-
adjustment.
3 Wait until the value is constant and then press the
SET button (see chapter 5 "Menu guide").
P2 and the relative humidity %rF at the pressure
level P2 are alternately displayed. P2 stands for the
pressure in the adjustment chamber (

) when the
switchover cock is closed (

).
4 Close valve (position switchover cock (

) across
the measurement chamber (

) and wait until the
relative humidity displayed has a constant value.
5 When the value is constant, confirm with the SET
button (see chapter 5 "Menu guide").