Vaisala DMP248 Manuel de service télécharger pdf (Page 17)

CHAPTER 3_______________________________________________________________INSTALLATION

VAISALA _________________________________________________________________________ 11

If the sensor head 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.

process pipe

welded sleeve

(G1/2)

Non leaking screw

(screw A)

closing valve

(ball valve)

sealing

capped nut

DIN 917-M22x1.5

when the probe is pulled

out for maintenance, cap

the hole with a capped nut;

this way, the process can be

open although the probe is

not in place

FIGURE 3-6 Installing the sensor head directly on the process pipe.

Installing the probe through the ball valve assembly

The best way to install the sensor head is through the ball valve

assembly. Use a 1/2” ball valve assembly with a ball hole of ∅14 mm

or more. In this kind of installation, it is not necessary to empty or

shut down the process for installing or removing the sensor head. If

the sensor head is installed in a process pipe, please note that the

nominal size of the pipe must be at least 1 inch. See FIGURE 3-7 -

FIGURE 3-8 for detailed instructions.

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Vaisala DMP248 Manuel de service Page 17