CM375 Portable 10-Meter Mast Revision: 7/13 C o p y r i g h t © 2 0 0 9 - 2 0 1 3 C a m p b e l l S c i e n t i f i c , I n c .
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Table of Contents PDF viewers: These page numbers refer to the printed version of this document. Use the PDF reader bookmarks tab for links to specific sections. 1. Overview ......................................................................1 1.1 1.2 Specifications .......................................................................................1 Guy Duckbill Anchor Kits ...................................................................2 2.
Table of Contents 3-24. 3-25. 3-26. 3-27. 3-28. 3-29. 3-30. 3-31. 3-32. Tape measure in slot for Northeast anchor ........................................ 15 Turnbuckle fastened to guy cable and anchor ................................... 16 Top and bottom guy cables fastened to an anchor............................. 16 Rope ratchet assists assembly............................................................ 17 Adjusting cable through wedge clamp ..............................................
CM375 Portable 10-Meter Mast 1. Overview The CM375 is a corrosion-resistant 10 m (30 ft) mast for applications requiring a tall yet portable instrument mount. It consists of six galvanized pipes, a stainlesssteel base, guy cables, 1 m crossarm and mount, and grounding kit. Duckbill anchor kits (required) and a guy-wire tensioning kit (recommended) are ordered separately. All of the components fit inside a 2 m (80 in) bag allowing the CM375 to be carried from site to site (see FIGURE 1-1). FIGURE 1-1.
CM375 Portable 10-Meter Mast Maximum Allowable Wind Gust i : 136 kmh–1 (85 mph) The wind gust value assumes: • Proper installation • Proper anchoring: o Adequate soil (guy anchors/base support) o Guy anchors at 20-ft from base with 120 degrees of separation o Proper guy tension (100 lb each) • No ice buildup • Standard air quality or wind assessment configuration (see Table below) 1.2 Guy Duckbill Anchor Kits A choice of duckbill anchor kits is offered for the CM375.
CM375 Portable 10-Meter Mast 2. Tools List (for tripod, mast, enclosures, and crossarms) 1/2-in. and 7/16-in. open end wrenches adjustable wrench Phillips head screw drivers (medium, small) Straight bit screwdrivers (large, medium) 12-in. torpedo level side-cut pliers pencil tape measure compass and site declination angle shovel sledge hammer (for driving ground rod and stakes) step ladder 3. CM375 Installation 3.
CM375 Portable 10-Meter Mast 3.2 .2 Assembling Mast Sections Step 1: Remove mast sections and other bundled hardware from tote; unzip and loosen straps (see FIGURE 3-2). NOTE Sections are numbered for sequential assembly (see FIGURE 3-3). FIGURE 3-2. CM375 in opened tote Base FIGURE 3-3.
CM375 Portable 10-Meter Mast Step 2: Place Section 1 at deployment location with base oriented, as shown in FIGURE 3-4 and mast pointing NORTH. NOTE A compass is included in the optional “Tensioning Kit” for your use. NORTH FIGURE 3-4. Mast Section 1 oriented on base Step 3: Use spikes provided (3 each) to anchor base to site (see FIGURE 3-5). WARNING Always maintain a safe distance between the mast and any overhead power lines.
CM375 Portable 10-Meter Mast NORTH Spikes FIGURE 3-5. Spike installation Step 4: Insert the Section 2 coupler into the top of Section 1 (see FIGURE 3-6). FIGURE 3-6.
CM375 Portable 10-Meter Mast Step 5: Secure joint with 2 flat washers, 2 lock washers and 2 bolts from the hardware bag (see FIGURE 3-7). FIGURE 3-7. Bag containing hardware Step 6: Assemble Section 3 to the top of Section 2 (see FIGURE 3-8). NOTE The BLACK tape around Section 2 is a reference (11 foot level) for optional sensor mounts. Section 2 Collar FIGURE 3-8.
CM375 Portable 10-Meter Mast Collar Guy Ring Section 2 Section 3 Collar FIGURE 3-9. Guy ring, mast Section 2 and mast Section 3 Step 8: Remove guy ring from bottom guy kit, pn 21663 (see FIGURE 3-9 and FIGURE 3-10). FIGURE 3-10.
CM375 Portable 10-Meter Mast Step 9: Place ball end of each guy cable into its slot in the guy ring and place guy ring onto coupler of Section 3 (see FIGURE 3-11). FIGURE 3-11. Guy cable inserted into guy ring NOTE Only one of the three cable ends is shown. Step 10: Slide coupler into Section 2 mast and assemble collars, as shown in FIGURE 3-12. FIGURE 3-12.
CM375 Portable 10-Meter Mast Step 11: Slide coupler end of Section 4 into the top of Section 3, and secure with remaining components from hardware bag (see FIGURE 3-13). Section 3 Coupler FIGURE 3-13. Mast Section 4 ready to be installed in mast Section 3 Step 12: Remove collars from Section 5 (see FIGURE 3-14). Collar Collar FIGURE 3-14.
CM375 Portable 10-Meter Mast Step 13: Remove the guy collar from the 21661 guy kit (FIGURE 3-15). FIGURE 3-15. 21661 guy kit Step 14: Place the guy cable ball ends into the guy ring, and then slide the guy ring onto the bottom end of Section 5 oriented as shown in FIGURE 3-16. Align the holes in Section 4 and Section 5, and reassemble the collars. FIGURE 3-16.
CM375 Portable 10-Meter Mast Step 15: Remove the hardware from Section 6. Insert Section 6 into the top of Section 5 and secure with hardware (FIGURE 3-17). FIGURE 3-17. Mast Section 6 3.3 Lightning Rod Assembly and Mounting Instrumentation Step 1: Fit lightning rod assembly (from pn 21660) to top of Section 6 mast (see FIGURE 3-18). FIGURE 3-18. Lightning rod assembly Step 2: Place clamp onto top of mast Section 6 and tighten (see FIGURE 3-19).
CM375 Portable 10-Meter Mast FIGURE 3-19. Installed lightning rod Step 4: Assemble enclosures, sensors and tie cables to mast, as required. 3.4 Anchor Installation FIGURE 3-20. Tape measure in slot for South anchor Step 1: For the South anchor, place tape measure into slot in base centering tape within notch on edge of base. Measure to 20 ft (see FIGURE 3-20). Step 2: At 20 ft, install the duckbill anchor with drive rod (see FIGURE 3-21).
CM375 Portable 10-Meter Mast WARNING Always maintain a safe distance between the mast and any overhead power lines. Contact local utilities prior to assembling the mast to locate any buried utility lines in the area the mast is to be installed. Rod Anchor Anchor Cable FIGURE 3-21. 19282 duckbill anchor and cable assembly (left). The 25699 has a threaded rod instead of the cable. The drive rod (right) is used for both the 19282 and 25699. 45° FIGURE 3-22.
CM375 Portable 10-Meter Mast Step 3: With a rod through the loop or metal ring, pull up on the cable or threaded rod until the anchor rotates and locks (see FIGURE 3-23). Anchor FIGURE 3-23. Locking anchor Step 4: Fill-in the hole around the cable or threaded rod with loose dirt and tamp firm. Step 5: Repeat process for the NE (FIGURE 3-24) and NW anchors. NE FIGURE 3-24.
CM375 Portable 10-Meter Mast Step 6: Attach guy wires to anchors by first opening the turnbuckle to the widest setting. Attach turnbuckle to wedge end of the guy cable, and then attach the other end of the turnbuckle to an anchor (see FIGURE 3-25). Open turnbuckle to widest setting. Guy Cable Wedge Anchor FIGURE 3-25. Turnbuckle fastened to guy cable and anchor Step 7: If using rope ratchet to assist assembly, set to 7 feet and attach to tension clamp on cable and to anchor end.
CM375 Portable 10-Meter Mast FIGURE 3-27. Rope ratchet assists assembly Step 8: Course adjustments to cable length are made by loosening screw clamp and then releasing wedge with a blade screwdriver (see FIGURE 3-28). This allows the cable to be adjusted through the wedge clamp. NOTE Retighten screw when adjustment is complete. FIGURE 3-28.
CM375 Portable 10-Meter Mast 3.5 Raise, Plumb Mast and Final Cable Tensioning Step 1: With NW and NE cables attached to anchors have one person lift mast, while another person pulls on the SOUTH cables to bring mast to an upright position (see FIGURE 3-29). If using rope ratchets, adjust them to allow further steps. FIGURE 3-29. Raising the mast Step 2: Attach SOUTH cables to anchor.
CM375 Portable 10-Meter Mast Step 3: Repeat process with the top guy cables to establish a straight mast. Step 4: Apply further tensioning using the turnbuckles (see FIGURE 3-31). FIGURE 3-31. Adjusting turnbuckles Step 5: Adjust each cable turnbuckle to maintain plumb and increase cable tension. A deflection of 3 inches when using a 4.4 pound (20 Newton) perpendicular force, 68 inches from the duckbill anchor loop equates to 100 pounds of tension in the cables (see FIGURE 3-32). FIGURE 3-32.
CM375 Portable 10-Meter Mast Step 6: After tensioning the top guy cables, recheck the bottom guy cables. Adjust, as necessary. 4. Maintenance Check and adjust guy cable tension at least once a month, and after wind gusts exceeding 50 mph.
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