Wohler A 400 Mode D'emploi page 18

Using the S-tube probe
Fig. 7: S-tube probe, not opened
Knurled screws
Immersion depth
Fig. 8: Details of the S-tube probe
18
Insert the closed S-tube through the measurement
opening into the gas line, while the burner is work-
ing.
Fix the S-tube with a cone, open it as shown in
Abb. 6 and direct the sensors as shown in the
figure.
If necessary, adjust the S-tube with the knurled
screws, so that it fits into the gas line.
NOTE!
The S-tube must be adjusted before the meas-
urement procedure starts, since it is required to
check and/or adjust the oppositely running orien-
tation of the measuring tubes after loosening the
knurled screws and adjusting the immersion
depth.
Start the measurement with the meter and follow
the instructions of the meter manual.
The meter will calculate the ventilation loss auto-
matically based on the measured flow speed and
temperature values and the parameters entered
by the user.