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Pressure, Velocity > Pressure Transmitter & Controller(압력 제어기 및 전송기)
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[Static Port for Barometric Transmitter / HD 9408PS 50K]
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STATIC PORT FOR BAROMETRIC MEASUREMENTS DESCRIPTION
The measurement of the barometric pressure in free fi eld can register values, which differ of hundreds of pascal from the effective ones, because of wind fl uctuation and direction. The HD9408PS 50 static port for barometric measurements minimizes such errors, because, besides working as a fi lter (brake) against the wind dynamic pressures, it allows to the barometer to work properly, even in presence of snow or ice, as well as to conform to the WMO directions (World Meteorology Organization).
The materials applied in manufacturing the static port are UV-resistant and can operate in the temperature range between -40°C and +80°C.
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INSTALLATION AND CONNECTION
The instrument is easy to install and has to be placed far from buildings, trees or any other source that might disturb the fl ow of the wind. HD9408PS 56 mounting bracket and three M5x16 Stainless Steel screws are available to fi x the port properly.
The connection of the static port to the barometer, i.e. either to a HD9408T or to a HD9408TR, is carried out through the HV55 UV- resistant special tube (inside Ø : 3mm, outside Ø : 6mm), which resists to climate changes, as well. Maintenance and cleaning are very simple. Plastic details are in LURAN S777K, manufactured by BASF. It is strongly suggested to use non-aggressive cleansers, compatible with the plastic material.
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According to the WMO directions, the allowed
measurement deviation at a 20meters/second wind speed
is 0.3mbar, corresponding to 300 Pascal. The HD9408PS
50 static port for barometric measurements falls into
such a value. The following tables show the values
resulted from the tests made in the wind tunnel.
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HD9408PS 50K |
Kit composed by static port, pole
mounting bracket and HV55 tube
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| HD9408PS 50 |
Static port
for barometric measurements equipped with the HV55
tube
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| HD9408PS 56 |
Mounting bracket for static port,
barometer fastening, pole anchor
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| HV55 |
HV55 UV- and
temperature-resistant silicone tube, *inside Ø : 3mm, outside Ø : 6mm, L=400mm
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