Vaisala MMT310 User Manual
Page 24
User's Guide _______________________________________________________________________
24 ___________________________________________________________________ M210474EN-C
NOTE
The probe can be installed in the process through the ball valve
assembly provided that the process pressure is less than 10 bars. This
way, the process does not have to be shut down when installing or
removing the probe. However, if the process is shut down before
removing the probe, the process pressure can be max. 20 bars.
NOTE
When measuring temperature dependent quantities make sure that the
temperature at the measurement point is equal to that of the process,
otherwise the moisture reading may be incorrect.
Follow the steps below to install the MMT318 probe through a ball valve
assembly. After the installation, the probe should be sitting in the process
chamber or pipeline as shown in Figure 8 on page 23.
1.
Shut down the process if the process pressure is more than 10 bars.
If the pressure is lower there is no need to shut down the process.
2.
Close the ball valve.
3.
Seal the threads on the fitting body; refer to Figure 6 Sealing of
Fitting Body into Process on page 21.
4.
Attach the fitting body to the ball valve and tighten it.
5.
Slide the clasp nut of the probe toward the filter, as far as it will go.
6.
Insert the probe to the fitting body, and manually tighten the clasp
nut to the fitting body.
7.
Open the ball valve.
8.
Push the probe through the ball valve assembly into the process. If
the pressure is high, use the pressing handle that is provided with
the probe. If you push the probe hard without using the handle, you
may damage the cable.
Note that the probe must be pushed to a depth where the filter is
completely inside the process flow.
9.
Mark the fitting screw and the clasp nut.
10. Tighten the clasp nut with an open-end wrench a further 50 ... 60º
(ca. 1/6 turn). If you have a suitable torque wrench, tighten the nut
to max 45 ± 5 Nm (33 ± 4 ft-lbs). Refer to Figure 7 on page 22.
NOTE
Take care not to tighten the clasp nut more than 60° to avoid difficulties
when opening it.