Chapter 3 _______________________________________________________________ Installation
VAISALA _______________________________________________________________________ 49
When the probe is installed directly on the process wall or pipe, note that
a closing valve may be needed on both sides of the installed probe so that
the probe can be removed from the process for calibration or
maintenance.
If the probe is installed in a pressurized chamber, always make sure that
the pressure of the chamber is equalized with the ambient pressure prior
to removing the probe. When the probe is pulled out for maintenance,
cap the hole with a capped nut. This way, the process can be running
although the probe is not in place. For ISO threaded connections, a plug
(Vaisala order code 218773) is available.
0706-001
Figure 33
Example of Installing the Probe Directly on the Process
Pipe
