User manual VAISALA WAA151

[. . . ] 9 Recommended Mast Length on the Top of Building . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 List of Tables Table 1 Table 2 Table 3 Table 4 Table 5 Table 6 Manual Revisions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Related Manuals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 MTBF Values. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] Wind sensors should not be located next to a building or any other object that might affect the flow of air. 0204-040 Figure 2 Recommended Mast Location in Open Area VAISALA___________________________________________________________9 User's Guide ________________________________________________________ In general, any object of height (h) will not remarkably disturb wind measurement at a minimum distance of 10 × h. There should be at least 150 m open area in all directions from the mast. Minimum distance between the mast and obstacles is ten times the height of an obstacle. Refer to Figure 2 on page 9. 0204-041 Figure 3 Recommended Mast Length on the Top of Building The recommended minimum length (marked with the letter h in Figure 3 above) for the mast that is installed on the top of a building is 1. 5 times the height of the building (H). When the diagonal (W) is less than the height (H) the minimum length of the mast is 1. 5 × W. Installation Procedure Mounting Sensor installation is most convenient when you use a Vaisala manufactured cross arm for mounting the sensor. 10 _____________________________________________________ M210293en-A Chapter 3 __________________________________________________ Installation Always mount the WAA151 Anemometer to the southern end of the cross arm. It is recommended that you remove the cup assembly to ease installation. Fit the 6-pin cable plug through the mounting flange at the end of the cross arm, then connect it to the sensor. Face the product label south and mount the sensor to the flange by twisting. Note that the plastic washers (1) should be inserted between the flange and the sensor. To replace the ball bearings, follow the procedure below and refer to Figure 6 on page 19. Remove the cup wheel assembly. CAUTION The cup wheel fixing screw has been treated with sealant. Do not remove the fixing screw to ensure perfect sealing after reassembling. 2. Loosen the hex nut of the connector (use a 22-mm tool). CAUTION Be careful not to bend the connector pins. 3. 6. Loosen the three pan head screws at the bottom of the sensor body (use a 7-mm tool). Loosen the spacer screws with a 7-mm tool and disconnect the heating element outlet. Remove the printed circuit board including the optocoupler. CAUTION Do not twist or bend the connector. Loosen the fixing screw of the chopper disc with a 2mm Allen key and remove the chopper disc. Remove the spacer ring. 16 _____________________________________________________ M210293en-A Chapter 4 ________________________________________________ Maintenance 10. Remove the internal retaining ring at the bottom of the shaft (using narrow-pointed pliers). Take the previous steps in opposite order until assembling the chopper disc. NOTE Be careful when handling the new ball bearings. Do not drop them or force them onto the shaft. 2. Attach the chopper disc (7) back onto the shaft. The disc has to be positioned so that the disc teeth do not touch the opto-coupler (6) on the circuit board. Tighten the screw. CAUTION Assure that the chopper disc teeth do not touch the optocoupler. [. . . ] Pack the faulty product using an ESD protection bag of good quality with proper cushioning material in a strong box of adequate size. Send the box to: Vaisala Oyj SSD Service Vanha Nurmijärventie 21 FIN-01670 Vantaa Finland 3. 6. VAISALA__________________________________________________________23 User's Guide ________________________________________________________ This page intentionally left blank. 24 _____________________________________________________ M210293en-A Chapter 6 _______________________________________________Technical Data CHAPTER 6 TECHNICAL DATA This chapter provides the technical data of the WAA151 Anemometer. Specifications Table 5 WAA151 Anemometer Specifications Description/Value Cup anemometer/Opto-chopper 0. 4 . . . 750 Hz square wave Uf = 0. 1007 × R + 0. 3278 (Uf = wind speed; R = o/p pulse rate) ± 0. 17 m/s 2) ± 0. 5 m/s High state > Uin -1. 5 V Low state < 2. 0 V < 30 µs 9. 5 . . . 15. 5 VDC, 20 mA typical 20 VDC or VAC, 500 mA typical MIL-C-26482 type; 6-wire cable Property Sensor/Transducer type Measuring range Starting threshold Distance constant Transducer output 0 . . . [. . . ]