CM375 Portable 10-Meter Mast
Revision: 7/13
Copyright © 2009-2013
Campbell Scientific, Inc.
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Table of Contents
PDF viewers: These page numbers refer to the printed version of this document. Use the
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1. Overview......................................................................1
1.1 Specifications .......................................................................................1
1.2 Guy Duckbill Anchor Kits ...................................................................2
2. Tools List (for tripod, mast, enclosures, and
crossarms) ................................................................3
3. CM375 Installation ...................................................... 3
3.1 Site Selection........................................................................................3
3.2 Assembling Mast Sections ...................................................................4
3.3 Lightning Rod Assembly and Mounting Instrumentation..................12
3.4 Anchor Installation.............................................................................13
3.5 Raise, Plumb Mast and Final Cable Tensioning ................................18
4. Maintenance ..............................................................20
Figures
1-1. 21720 tote.............................................................................................1
3-1. Assembled CM375...............................................................................3
3-2. CM375 in opened tote..........................................................................4
3-3. Mast base, sections, and lightning rod kit ............................................4
3-4. Mast Section 1 oriented on base...........................................................5
3-5. Spike installation ..................................................................................6
3-6. Coupler installed in top of mast Section 1 ...........................................6
3-7. Bag containing hardware......................................................................7
3-8. Mast Section 2 and mast Section 3.......................................................7
3-9. Guy ring, mast Section 2 and mast Section 3.......................................8
3-10. 21663 bottom guy kit ...........................................................................8
3-11. Guy cable inserted into guy ring ..........................................................9
3-12. Mast Section 3 and guy ring/collar assembly.......................................9
3-13. Mast Section 4 ready to be installed in mast Section 3 ......................10
3-14. Mast Section 5....................................................................................10
3-15. 21661 guy kit .....................................................................................11
3-16. Mast Section 5 and guy ring/collar assembly.....................................11
3-17. Mast Section 6....................................................................................12
3-18. Lightning rod assembly......................................................................12
3-19. Installed lightning rod ........................................................................13
3-20. Tape measure in slot for South anchor...............................................13
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. ........................................................14
3-22. Anchor driven into ground at 45° angle .............................................14
3-23. Locking anchor...................................................................................15
i
Table of Contents
3-24. Tape measure in slot for Northeast anchor........................................ 15
3-25. Turnbuckle fastened to guy cable and anchor ................................... 16
3-26. Top and bottom guy cables fastened to an anchor............................. 16
3-27. Rope ratchet assists assembly............................................................ 17
3-28. Adjusting cable through wedge clamp .............................................. 17
3-29. Raising the mast ................................................................................ 18
3-30. Post level ensures vertical mast......................................................... 18
3-31. Adjusting turnbuckles........................................................................ 19
3-32. Guy cables with 100 lb of tension ..................................................... 19
ii
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. 21720 tote
1.1 Specifications
Weight: 30 kg (66 lb)
Mast: 9.2 m (30 ft) total length; consists of five
Main Mast Diameter: 48.26 mm (1.9 in)
Top Section Mast Diameter: 44.2 mm (1.74 in)
Base Radius: 6 m (20 ft) to each of three guy points, 120
Guy Configuration: Three guy cables at two levels; guyed at 3.6 m
Recommended Guy
Wire Pretension: 100 lb each; check and adjust guy wire tension
1.82 m (6 ft) and one 1 m (39 in) sections
degrees apart
(12 ft) and at 7.2 m (24 ft)
at least once a month, and after wind gusts
exceeding 50 mph
Maximum Weight of
Mounted Equipment: 34 kg (75 lb)
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. The 19282 Guy
Duckbill Standard Anchor Kit is adequate for most sandy and loamy soils.
Clay soils and other soils with higher corrosive properties will require the
25699 Guy Duckbill Heavy Duty Anchor Kit. These corrosive soils, also
known as aggressive soils, have one or more of the following properties:
• High electrical conductivity (>0.33 dS m
• High acidity (pH <5)
• High chloride concentration (>1000 ppm)
• High sulfate concentration (>500 ppm)
• Poor aeration
Both the 19282 and 25699 have one drive rod. The 19282 also has four
duckbill anchors with a cable attached to each of them; at the end of the cable
is a loop for connecting the guy wires. The 25699 has a threaded rod attached
to each of the four duckbill anchors instead of the cable; at the end of the
threaded rod is a metal ring for connecting the guy wires.
i
The amount of wind gust that this mount can withstand is affected by quality
of anchoring and installation, guy wire tension, soil type, guy angle, and the
number, type, and location of instruments fastened to the CM375.
–1
)
2
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
3.1 Site Selection
Select a site free from overhead power lines, and 30 m (100 ft) in any direction
from trees, buildings, and other obstructions (see FIGURE 3-1).
FIGURE 3-1. Assembled CM375
3
CM375 Portable 10-Meter Mast
3.2 Assembling Mast Sections .2 Assembling Mast Sections
Step 1: Remove mast sections and other bundled hardware from tote; unzip
Step 1: Remove mast sections and other bundled hardware from tote; unzip
and loosen straps (see FIGURE 3-2).
and loosen straps (see FIGURE 3-2).
NOTE
Sections are numbered for sequential assembly (see FIGURE 3-3). Sections are numbered for sequential assembly (see FIGURE 3-3).
FIGURE 3-2. CM375 in opened tote
4
Base
FIGURE 3-3. Mast base, sections, and lightning rod kit
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
WARNING
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).
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.
5
CM375 Portable 10-Meter Mast
Spikes
FIGURE 3-5. Spike installation
Step 4: Insert the Section 2 coupler into the top of Section 1 (see FIGURE
3-6).
NORTH
6
FIGURE 3-6. Coupler installed in top of mast Section 1
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).
NOTE
FIGURE 3-7. Bag containing hardware
Step 6: Assemble Section 3 to the top of Section 2 (see FIGURE 3-8).
The BLACK tape around Section 2 is a reference (11 foot level)
for optional sensor mounts.
Section 2
Collar
FIGURE 3-8. Mast Section 2 and mast Section 3
Step 7: Remove the collars from Section 3 and place next to the mounting
holes in Section 2 (see FIGURE 3-8 and FIGURE 3-9).
7
CM375 Portable 10-Meter Mast
Section 2
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).
Collar
Guy Ring
Section 3
Collar
8
FIGURE 3-10. 21663 bottom guy kit
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. Mast Section 3 and guy ring/collar assembly
9
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).
FIGURE 3-14. Mast Section 5
Collar
Collar
10
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. Mast Section 5 and guy ring/collar assembly
11
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).
12
FIGURE 3-18. Lightning rod assembly
Step 2: Place clamp onto top of mast Section 6 and tighten (see FIGURE
3-19).
Step 3: Insert rod into clamp 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).
The anchor needs to be driven into the ground at a 45° angle (see FIGURE
3-22). Drive anchor until the loop or metal ring is several inches above the
ground.
13
CM375 Portable 10-Meter Mast
d
WARNING
Anchor
Cable
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.
Ro
Anchor
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. Anchor driven into ground at 45° angle
14
Anchor
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).
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. Tape measure in slot for Northeast anchor
15
CM375 Portable 10-Meter Mast
r
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).
NOTE
Open turnbuckle to widest setting.
Guy Cable Wedge
Ancho
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. Do this for both NE and NW
anchors and top and bottom guy cables (see FIGURE 3-26 and FIGURE 3-27).
Do not connect the SOUTH cables at this time.
FIGURE 3-26. Top and bottom guy cables fastened to an anchor
16
CM375 Portable 10-Meter Mast
NOTE
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.
Retighten screw when adjustment is complete.
FIGURE 3-28. Adjusting cable through wedge clamp
17
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. While first person holds mast and
uses a post level (available at most hardware stores or online), the second
person adjusts each of the bottom guy cable wedge clamps, maintaining level
in all directions (see FIGURE 3-30). The rope ratchet can be used to
temporarily remove the load from the wedge assembly during wedge
adjustments.
18
FIGURE 3-30. Post level ensures vertical mast
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. Guy cables with 100 lb of tension
19
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.
20
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