Vaisala DMP248 Service Manual download pdf (Page 16)

OPERATING MANUAL_______________________________________________________________

10 _____________________________________________________________________ U263EN-1.4

NOTE

Be careful not to tighten the clasp nut more than 60° as this may

result in difficulties when trying to open it.

The probe is delivered with non-leaking screw A mounted. For by-

pass measurements, this screw is removed and replaced with leaking

screw B (included) and an O-ring is placed on the groove of the

sintered filter prior to installation. Make sure to tighten the screw

carefully.

Screw B has a small (0.08 mm) laser-made hole in the middle; the gas

or air to be measured passes through the sintered filter and by the

sensor, and leaks out through the screw.

Mounting the probe directly to the process

Select a point, which gives a true picture of the process. The

transmitter can be installed directly in the process wall, especially if

the pressure of the process is 1 bar (atmospheric processes).

recommended adjustment range

25...135 mm

non leaking screw

(screw A, factory setting)

welded sleeve (G1/2, Ø 40 mm)

process wall

Leave at least 25 mm (1 ")

of probe head free to enable

a faster response time in

unpressurized processes

25 mm

FIGURE 3-5 Installing the probe in an atmospheric process.

If the probe is installed in process pipes where the water is likely to

collect at the measurement point, take care to install the sensor head

so that it will not be immersed in water.

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 sensor head can be removed from the process for

calibration and maintenance.

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Vaisala DMP248 Service Manual Page 16