22
6. Adjustment on site
6 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..
7 Input the pressure ratio
into the operating
menu. Confirm input with the SET button.
8 Remove adjustment device (
) from the
compressed air pipe.
9 Unscrew testo 6743 from the adjustment chamber
(
) and re-install for continuous operation.
Limits of the adjustment chamber
In order to avoid false adjustments, the adjustment
described above is only accepted by testo 6743 if
a) The temperature during the adjustment process
remains constant, i. e. the temperature difference
is less than 0.5 Kelvin: (I T1-T2 I < 0.5 K).
or
b) The calculated offset correction is < I 0.5%RH I
or < I 0.1 * RHP1 I. The greater condition applies!
RHP1 is the relative humidity at pressure level P1.
Otherwise the display will show ERR.
Summary of Contents for 6740
Page 1: ...Instruction manual en testo 6740 ...
Page 28: ...0970 6740 en 08 en GB ...
