Vaisala DMP248 Service Manual Page 21

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CHAPTER 3_______________________________________________________________INSTALLATION
VAISALA _________________________________________________________________________ 15
STEP 3: push the probe head through the ball valve assembly into the
process. If the pressure is high, use a manual press tool. Note that the
sensor head must be pushed so deep that the filter is completely inside
the process flow.
VALVE OPEN
MANUAL
PRESS TOOL
VALVE CLOSED
FILTER
FIGURE 3-10 Installing the probe through the ball valve assembly;
step 3.
For by-pass measurements, the probe is mounted behind the ball valve
assembly and non-leaking screw A on the fitting body is replaced with
leaking screw B and O-ring is placed on the groove of the sintered
filter. 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. The process pressure
reduces in the hole of the screw B. This installation is recommended if
the process flow rate is >20 m/s and there is over-pressure in the
process.
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