Vaisala WA252 Manuel utilisateur

Vaisala or its individual partners. Any reproduction, transfer, distribution or storage of

information contained in this document is strictly prohibited. All specifications —

technical included are subject to change without notice.

QUICK GUIDE

WA252 Heated Anemometer

INSTALLATION

Initial check

Before installation, check that WAA252 is not damaged during

transportation. Make sure that the shaft rotates smoothly without

any detectable noise. Vaisala recommends mounting 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.

Mounting instructions

Vaisala recommends installing the heated anemometer WAA252

onto WAC151 sensor cross arm. On bottom of 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. Set it in good thermal contact with the

mounting support.

NOTE The three mounting screws must be properly

tightened to force the temperature sensor button

firmly enough against the support.

Figure 1. Mounting of the wind sensor and the hub

If you use the WAC151 cross arm, mount WAA252 at the

southern end, and WAV252 Heated Wind Vane at the northern

end.

Pre-assemble the 3 mounting screws with plastic washers

to the anemometer's mounting legs.

Fit the 6-pin cable plug through the mounting flange and

connect it to the sensor.

Mount the anemometer to the flange by twisting, and

tighten the screws.

Mount the cup assembly. Align the planes in the shaft and

inside the hub. The bottom edges of the hub and the

shoulder must 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

cross arm is shown in 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:

For power supply, connect the YEL, GRN, and PNK

wires to the screw terminal #2 and the WHT, BRN, and

GRY wires to the terminal #3.

For signal output and grounding, connect BLU to the

terminal #1 and BLK to the terminal #5.

For the optional transducer power input connect RED to

the terminal #4.

For the optional power output for external transmitter

move the REDBLU spare wire to the terminal #13.

Use Vaisala WHP25 Mains Power Supply as a power source. It

has a mast-mountable, all-weather enclosure. For a typical

installation, see cover figure. WHP25 is sold as a spare part.

www.vaisala.com

M210758EN-B

MAINTENANCE AND REPAIR

Check the ball bearings once a year visually and by rotating the

sensor shaft. To do this, remove first the cup assembly as

instructed below (A1.). Make sure that the shaft spins smoothly

and does not create any detectable noise.

Only a trained technician may replace the bearings.

The numbers in parenthesis refer to Figure 3.

To disassemble the sensor:

A1.

Loosen the set screw with Allen key and carefully remove

the cup assembly.

CAUTION Be careful with the connector pins, do

not bend them.

A2.

Loosen the hex nut of the green MIL-connector at the

bottom of the sensor body (use 22-mm tool).

A3.

Loosen the three cap nuts (1) at the bottom of the sensor

body with a 7-mm tool.

A4.

Remove the body cover and the O-rings (2).

A5.

Release the connector (3) of two white wires from the

power supply board (4).

A6.

Loosen the three nuts (5) at the bottom of the power

supply board (4) and remove it with a 7-mm tool.

A7.

Loosen the shaft heating foil (6) with pliers.

A8.

Loosen the set screw of the rotating transformer assembly

(7) with an Allen key.

A9.

Loosen the spacer screws (8) with a 6-mm tool.

A10.

Remove the sensor board (9) together with the rotating

transformer assembly (7).

CAUTION Handle the rotating transformer

carefully, do not drop or hit.

A11.

Remove the retaining ring (10) with narrow-pointed pliers

and the bushing (11) from the shaft tunnel.

A12.

Remove the upper bearing (12) after pulling out the

shaft.

CAUTION Handle the shaft carefully, do not drop

or hit.

A13.

Remove the retaining ring (13) at the shaft.

A14.

Remove the lower bearing (14).

For reassembling the sensor:

B1.

Install the bearings in reverse order.

NOTE Be careful when assembling the

bearings.

B2.

The rotating transformer assembly (7) is reinstalled

together with the sensor board (9). Its (7) set screw is not

fastened until in step B7, when the power supply board

has been reinstalled and the gap adjusted.

B3.

In assembling, push the transformer (7) as far up as

possible towards the shaft tunnel.

B4.

Reassemble the spacer screws (8), the power supply board

(4) and tighten the nuts (5).

NOTE Make sure the 4-pin connector (15)

installs properly.

B5.

For adjusting the gap, place a 1.2 mm feeler gauge

between ferrite coils (parts 4 and 7) (preferably use 30

mm wide feeler gauge).

B6.

Place a screwdriver tip into the slot between the top end

of rotating transformer assembly (7) and the shaft tunnel,

and pry until the air gap between ferrite coils is 1.2 mm

(0.047") (use feeler gauge for measuring).

CAUTION The ferrite coils are breakable, do not

try to adjust the gap by prising them.

B7.

When the gap is right, fasten the set screw of the rotating

transformer assembly (7).

CAUTION Make sure the rotating transformer

assembly rotates freely without

touching the lower part at any rotary

position of the shaft.

B8.

Reconnect the shaft heating foil (6) and the connector of

two white wires (3).

B9.

Reassemble the body cover (2) with new O-rings.

B10.

Tighten the three cap nuts (1) and the connector nut.

B11.

Install the cup assembly as instructed in mechanical section.

Spare parts:

Order number:

Cup assembly for WAA252

WA35066

Set of bearings and gasket

Power supply WHP25

16644WA

WHP25

Figure 3 WAA252 assembly

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