Vaisala PTB220 - Manual (Page 43)

C HAPTER 5_______________________________________________________________ INSTALLATION
V AISALA _________________________________________________________________________ 37
CHAPTER 5
INSTALLATION
Mounting
In automatic weather station applications and in other harsh operating
environments, the PTB220 series digital barometers have to be
installed inside a weather resistant or otherwise protective enclosure.
The pressure fitting must also be protected from rain as water may get
into the pressure connector and cause errors in the pressure
measurement. Please take into a consideration that the pressure fitting
supplied with the barometer is not a static pressure head and that the
barometer cannot be used successfully as such in turbulent or high
speed static wind conditions.
NOTE The barometric pressure measurement accuracy quoted for the
PTB220 barometers does not include any wind or air conditioning
system measurement errors.
In benign room conditions, for example in laboratory measurements
no further environmental protection is required. In all cases, attention
must be paid to proper grounding of the barometer (see page 40).
The main dimensions (in mm) and recommended mounting positions
of the PTB220 barometers are shown in
F IGURE 5-1 .