PWS100 Present Weather Sensor - Campbell Scientific

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Section 6. Installation In order to minimize user interaction with the unit, the PWS100 should be placed away from sources of contamination, in the case of roadside monitoring, larger mounting poles can be used. More regular maintenance will be required when the instrument is placed in areas where contamination is unavoidable or where measurements may be safety critical. The orientation of the unit should be such that the horizontal sensor head points north in the northern hemisphere and south in the southern hemisphere. The angle of inclination of the second sensor head is such that the deviation from north/south orientation causes no increase in system noise. High frequency light sources can lead to increased system noise and hence erroneous weather classification and so the PWS100 should be positioned in a location where such interference is minimized. Ideally this should be a minimum of 100 m from the nearest high frequency light source, with the sensor heads pointing away from the light source. In any case the sensor heads should be positioned to be away from any high frequency light source. Avoid locations where the transmitter is pointing at a light scattering or reflective surface. WARNING When installing the sensor, avoid pointing the laser housing toward areas where binoculars are commonly used. 6.2 Unloading and Unpacking 6.2.1 Unpacking Procedure To be at any risk from the laser light source, the operator must look directly down the beam of light and must be at the same height and in exact alignment with the sensor. In addition, the beam diverges slightly so the risk decreases with distance from the sensor. Depending on the power and mounting options selected for the PWS100 there will be up a number of boxes containing the PWS sensor unit, power supply/ external communications enclosure and grounding equipment. CAUTION Handle the boxes carefully, taking care not to drop them as the sensor can be damaged if dropped. Unpack the boxes carefully and check the contents, ensuring that the contents match those listed on the packing slip. Carefully remove the items and replace all packing materials back into the empty boxes and store in case the unit is required to be repacked for shipping. 6.2.2 Storage Information The PWS100 should be stored between -40° to +70°C in a dry place, preferably with the enclosures securely fastened with desiccant in place. The optics should be protected from possible accidental damage. 6-2
Section 6. Installation 6.3 Installation Procedures 6.3.1 Assembling the PWS100 The PWS100 comes as a single unit, with the DSP enclosure attached to the base of the sensor arms. The PWS100 and power/communication enclosure (if purchased) are typically mounted to a Campbell Scientific tripod. Usersupplied mounting structures should be strong enough to withstand high winds, without significant movement. See the manuals supplied with your tripod for details on how to set up ready for PWS100 mounting. Tripods need to be firmly secured to a base with the central pole vertical to ensure correct measurements with the PWS100. See the relevant tripod or tower manual for further details. 6.3.2 Mounting the PWS100 NOTE A PWS100 purchased from Campbell Scientific Europe will have a different mounting bracket. A pole mounting kit is supplied with the PWS100. This kit includes a DSP plate, a bracket, two u-bolts, four flat washers, four split washers, and four nuts. The PWS100 usually comes with the DSP plate attached to it. The PWS100 mounts onto a Campbell Scientfiic tripod, tower, or a user-supplied pole with a 1.5 inch (3.81 cm) to 2.1 inch (5.25 cm) outer diameter as follows. 1. Fasten the bracket to the pole using one u-bolt, two flat washers, two split washers, and two nuts (see Figure 6-2). 2. Place the DSP plate on the bracket. The tabs of the bracket fit in the notches at the top of the DSP plate (see Figure 6-3). 3. Fasten the bottom of the DSP plate using the remaining u-bolt, washers, and nuts (see Figure 6-4). 4. Mount the power supply enclosure if purchased. This enclosure can be mounted to the same tripod, tower, or user-supplied pole as the PWS100. Alternatively the power supply can be mounted elsewhere (e.g., on a wall at some distance from the sensor). The power supply enclosure should be mounted away from the sensor head to avoid wind flow disturbance or rain drops bouncing back up into the sensor’s sensing volume. CAUTION Take care not to overtighten the nuts on the u-bolts, as it may be possible to distort and/or damage the bracket or DSP plate by doing so, and/or the nuts may seize up. Only tighten the nuts to a degree necessary to hold the PWS100 firmly in place. 6-3
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Page 4 and 5: Assistance Products may not be retu
Page 6 and 7: PWS100 Table of Contents 6.4 Ground
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Page 16 and 17: Section 3. Initial Inspection 3-2
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Page 20 and 21: Section 5. Specifications 5.3 Optic
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Section 7. Operation To set manual
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Section 7. Operation 7.5.3 Viewing
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Section 7. Operation The PWS100 wil
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Section 7. Operation Select the Xmo
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Section 7. Operation To set the tim
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Section 7. Operation 'Main Program
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Section 7. Operation 7-50
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Section 8. Functional Description F
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Section 8. Functional Description 8
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Section 8. Functional Description s
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Section 9. Maintenance It is advisa
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Section 10. Troubleshooting 10.2.3
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Section 10. Troubleshooting 10-4
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Appendix A. PWS100 Output Codes Clo
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Appendix A. PWS100 Output Codes Fre
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Appendix A. PWS100 Output Codes Sno
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Appendix A. PWS100 Output Codes How
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Appendix A. PWS100 Output Codes A-1
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Appendix B. Wiring FIGURE B-2. DSP
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Appendix C. Cable Selection WIRING
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Appendix C. Cable Selection WIRING
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Appendix D. Software Flowchart D-2
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Appendix D. Software Flowchart G Po
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Appendix D. Software Flowchart L Sh
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Appendix E. Menu System Map E-2
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Appendix E. Menu System Map E-4
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PWS100 Present Weather Sensor - Campbell Scientific

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