Vaisala WAA252 Quick Reference Manual

Quick Reference Guide
WAA252 Heated Anemometer
Installation and Maintenance
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INSTALLATION
Initial Check
Prior to the installation check that the WAA252 is not damaged
during transportation. Check also that the shaft rotates smoothly
without any detectable noise. It is recommended to mount the
sensor body when the cup assembly is removed. Be careful not
to cause damage to the shaft of the sensor body or to the
connector pins.
Mechanical
The Heated Anemometer WAA252 is preferably installed into
the WAC151 sensor cross arm. On bottom of the WAA252 there
is a special button-shaped temperature sensor (diameter 22 mm),
elastically attached to the bottom plate. This is for sensing the
ambient temperature and should therefore be set in good thermal
contact with the mounting support.
NOTE The three mounting screws properly tightened will
force the temperature sensor button firmly enough
against the support.
Figure 1. Mounting of the Wind Sensor and the Hub
When installed to the WAC151 cross arm, the WAA252 is
mounted at the southern end, the northern end is reserved for the
WAV252 Heated Wind Vane.
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First pre-assemble the three mounting screws, with plastic
1.
washers, to the anemometer's mounting legs.
Fit the 6-pin cable plug through the mounting flange and
2.
connect it to the sensor.
Mount the anemometer to the flange by twisting, and
3.
tighten the screws.
Finally, mount the cup assembly. Align the planes in the
4.
shaft and inside the hub. The bottom edges of the hub and
the shoulder should reach approximately the same level
(see Figure 1). Tighten the set screw.
WAC151 Wiring
The wiring diagram for the WA252 system to the WAC151
Sensor Crossarm is presented in the Figure 2. The power input
wire connections are highlighted, since they differ from those for
regular wind sensors.
Figure 2. WAC151 Standard Wiring for WAA252 and WAV252
When using standard power and signal cables ZZ45049 and
ZZ45048 the connections are following:
1. For power supply, connect the YEL,GRN, and PNK
colored wires to the screw terminal #2 and the WHT,
BRN, and GRY colored wires to the terminal #3.
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2. For signal output and grounding, connect BLU to the
terminal #1 and BLK to the terminal #5.
3. For the optional transducer power input connect RED to
the terminal #4.
4. For the optional power output for external transmitter
move the REDBLU spare wire to the terminal #13.
As a power source use the Vaisala WHP25 Mains Power Supply,
which has a mast mountable, all-weather enclosure. For a typical
installation see the figure on the front page.
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