Vaisala DMP248 Service Manual download pdf (Page 13)

CHAPTER 3_______________________________________________________________INSTALLATION

VAISALA __________________________________________________________________________ 7

CHAPTER 3 INSTALLATION

Selecting the place of installation

Select a place which gives a true picture of the environment or

process; also select a place that is as clean as possible. Air should

circulate freely around the sensor.

It is recommended that the sensor head is installed directly in the

process through the ball valve assembly. When the ball valve

assembly is used, the chamber or the duct does not have to be emptied

or shut down for installation or removal of the probe. Install the sensor

head transversely against the direction of the process flow.

If the probe head has to be installed aside of the process gas flow or

the process is very hot or particularly dirty, the probe can be installed

in a “leak-through” position. In this installation, the probe is mounted

behind the ball valve assembly and if necessary, a cooling coil and/or

a filter can be mounted in between. The flow passes through the

sensor head and leaks out through a vent hole in the fitting body

enabling a reasonable response time. In hot and dirty processes, a

sample system can also be used.

Mounting the transmitter

In FIGURE 3-1 and FIGURE 3-2, you can see the dimensions of the

DMP248 transmitter:

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 144 145

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Vaisala DMP248 Service Manual Page 13