Vaisala MMT330 - Manual (Page 48)

User's Guide _______________________________________________________________________
46 ___________________________________________________________________ M210733EN-G
Follow the steps below to install the MMT338 probe through a ball valve
assembly. After the installation, the probe should be sitting in the process
chamber or pipeline as shown in Figure 26 on page 45.
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 24 on page 43.
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 so deep that the filter is
completely inside the process flow.
9. Mark the fitting screw and the clasp nut.
10. Tighten the clasp nut with a fork spanner a further 50 ... 60º
(ca. 1/6 turn). If you have a suitable torque spanner, tighten the nut
to max 45 ± 5 Nm (33 ± 4 ft-lbs). Refer to Figure 25 on page 43.
NOTE Take care not to tighten the clasp nut more than 60° to avoid difficulties
when opening it.
If you wish to remove the probe from the process, note that you have to
pull the probe out far enough. You cannot close the valve if the groove
on the probe body is not visible.