Campbell CM375 Instruction Manual

CM375 Portable 10-Meter Mast

Revision: 8/10

Copyright © 2009-2010

Campbell Scientific, Inc.

Warranty and Assistance

The CM375 PORTABLE 10-METER MAST is warranted by Campbell
Scientific, Inc. to be free from defects in materials and workmanship under
normal use and service for twelve (12) months from date of shipment unless
specified otherwise. Batteries have no warranty. Campbell Scientific, Inc.'s
obligation under this warranty is limited to repairing or replacing (at Campbell
Scientific, Inc.'s option) defective products. The customer shall assume all
costs of removing, reinstalling, and shipping defective products to Campbell
Scientific, Inc. Campbell Scientific, Inc. will return such products by surface
carrier prepaid. This warranty shall not apply to any Campbell Scientific, Inc.
products which have been subjected to modification, misuse, neglect, accidents
of nature, or shipping damage. This warranty is in lieu of all other warranties,
expressed or implied, including warranties of merchantability or fitness for a
particular purpose. Campbell Scientific, Inc. is not liable for special, indirect,
incidental, or consequential damages.

Products may not be returned without prior authorization. The following
contact information is for US and International customers residing in countries
served by Campbell Scientific, Inc. directly. Affiliate companies handle
repairs for customers within their territories. Please visit
www.campbellsci.com to determine which Campbell Scientific company
serves your country.

To obtain a Returned Materials Authorization (RMA), contact Campbell
Scientific, Inc., phone [phone]. After an applications engineer
determines the nature of the problem, an RMA number will be issued. Please
write this number clearly on the outside of the shipping container. Campbell
Scientific's shipping address is:

CAMPBELL SCIENTIFIC, INC.

RMA#_____
815 West 1800 North
Logan, Utah 84321-1784

For all returns, the customer must fill out a “Declaration of Hazardous Material
and Decontamination” form and comply with the requirements specified in it.
The form is available from our website at
completed form must be either emailed to [e-mail]
435-750-9579. Campbell Scientific will not process any returns until we
receive this form. If the form is not received within three days of product
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www.campbellsci.com/repair

. A

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CM375 Table of Contents

PDF viewers note: These page numbers refer to the printed version of this document. Use
the Adobe Acrobat® bookmarks tab for links to specific sections.

1. Overview.......................................................................1

1.1 Specifications............................................................................................1

1.2 Guy Duckbill Anchor Kits........................................................................2

2. CM375 Installation .......................................................3

2.1 Site Selection ............................................................................................3

2.2 Assembling Mast Sections........................................................................4

2.3 Lightning Rod Assembly and Mounting Instrumentation ......................12

2.4 Anchor Installation .................................................................................13

2.5 Raise, Plumb Mast and Final Cable Tensioning.....................................17

3. Maintenance ............................................................... 19

Figures

1-1. 21720 Tote ..............................................................................................1

2.1-1. Assembled CM375...............................................................................3

2.2-1. CM375 in Opened Tote........................................................................4

2.2-2. Mast Sections and Base........................................................................4

2.2-3. Mast Section 1 Oriented on Base .........................................................5

2.2-4. Spikes Installation ................................................................................5

2.2-5. Coupler Installed in Top of Mast Section 1..........................................6

2.2-6. Bag Containing Hardware....................................................................6

2.2-7. Mast Section 2 and Mast Section 3 ......................................................7

2.2-8. Guy Ring, Mast Section 2 and Mast Section 3.....................................7

2.2-9. 21663 Bottom Guy Kit.........................................................................8

2.2-10. Guy Cable Inserted into Guy Ring .....................................................8

2.2-11. Mast Section 3 and Guy Ring/Collar Assembly.................................9

2.2-12. Mast Section 4 Ready to be Installed in Mast Section 3 ....................9

2.2-13. Mast Section 5..................................................................................10

2.2-14. Mast Section 5 Installed in Mast Section 4 ......................................10

2.2-15. 21661 Guy Kit..................................................................................11

2.2-16. Mast Section 5 and Guy Ring/Collar Assembly...............................11

2.3-1. Lightning Rod Assembly....................................................................12

2.3-2. Installed Lightning Rod......................................................................12

2.4-1. Tape Measure in Slot for South Anchor.............................................13

2.4-2. 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...........13

2.4-3. Anchor Driven into Ground at 45° Angle ..........................................14

2.4-4. Locking Anchor..................................................................................14

2.4-5. Tape Measure in Slot for North East Anchor.....................................15

2.4-6. Turnbuckle Fastened to Guy Cable and Anchor ................................15

2.4-7. Top and Bottom Guy Cables Fastened to an Anchor .........................16

i

CM375 Table of Contents

2.4-8. Rope Racket Assists Assembly.......................................................... 16

2.4-9. Adjusting Cable through Wedge Clamp............................................ 17

2.5-1. Raising the Mast ................................................................................ 17

2.5-2. Pole Level Ensures Vertical Mast...................................................... 18

2.5-3. Adjusting Turnbuckles ...................................................................... 18

2.5-4. Guy Cables with 100 lbs of Tension.................................................. 19

ii

CM375 Portable 10-Meter Mast

1. Overview

The CM375 is a corrosion-resistant 30-ft (10 m) mast for applications requiring a
tall yet portable instrument mount. It consists of five 6-ft (2 m) galvanized pipes,
a stainless-steel 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 an 80”-long bag allowing the
CM375 to be carried from site to site (see Figure 1-1).

FIGURE 1-1. 21720 Tote

1.1 Specifications

Weight: 66 lbs (30 kg)

Mast: 30 ft (9.2 m) total length; consists of five 6-ft (1.82 m) sections

Main Mast Diameter: 1.9” (48.26 mm)

Top Section Mast Diameter: 1.74” (44.2 mm)

Base Radius: 20 ft (6 m) to each of three guy points, 120 degrees apart

Guy Configuration: three guy cables at two levels; guyed at 12 ft (3.6 m) and

at 24 ft (7.2 m)

Recommended Guy Wire Pretension: 100 lbs each; check and adjust guy

wire tension at least once a month, and after wind gusts exceeding 50 mph.

Maximum Weight of Mounted Equipment: 75 lbs (34 kg)

Maximum Allowable Wind Gust

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 lbs each)

• No ice buildup

• Standard air quality or wind assessment configuration (see Table

below)

1

: 85 mph (136 km h-1)

1

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

CM375 Portable 10-Meter Mast

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 for standard soils, and the 25699 Guy
Duckbill Heavy Duty Anchor Kit is for aggressive soils. Aggressive soils
have:

• Resistivity of less than 3000 ohm-cm

• pH of less than 5

• Chloride of greater than 1000 ppm

• Sulfate of greater than 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.

2

2. CM375 Installation

2.1 Site Selection

Select a site free from overhead power lines, and 100 feet (30 m) in any
direction from trees, buildings and other obstructions (see Figure 2.1-1).

CM375 Portable 10-Meter Mast

FIGURE 2.1-1. Assembled CM375

3

CM375 Portable 10-Meter Mast

2.2 Assembling Mast Sections

Step 1: Remove mast sections and other bundled hardware from tote; unzip
and loosen straps (see Figure 2.2-1).

NOTE

Sections are numbered for sequential assembly (see Figure 2.2-2).

FIGURE 2.2-1. CM375 in Opened Tote

PN 21669 crossarm-to­pole mounting kit
contains the lightning
rod, copper grounding
rod, and duckbill
anchor drive rod.

Base

4

FIGURE 2.2-2. Mast Sections and Base

CM375 Portable 10-Meter Mast

Step 2: Place Section 1 at deployment location with base oriented, as shown in
Figure 2.2-3 and mast pointing NORTH.

NOTE

A compass is included in the optional "Tensioning Kit" for your
use.

NORTH

FIGURE 2.2-3. Mast Section 1 Oriented on Base

Step 3: Use spikes provided (3 each) to anchor base to site (see Figure 2.2-4).

NORTH

Spikes

FIGURE 2.2-4. Spikes Installation

5

CM375 Portable 10-Meter Mast

Step 4: Insert the Section 2 coupler into the top of Section 1 (see Figure 2.2-5).

FIGURE 2.2-5. Coupler Installed in Top of Mast Section 1

Step 5: Secure joint with 2 flat washers, 2 lock washers and 2 bolts from the
hardware bag (see Figure 2.2-6).

6

FIGURE 2.2-6. Bag Containing Hardware

CM375 Portable 10-Meter Mast

Step 6: Assemble Section 3 to the top of Section 2 (see Figure 2.2-7).

NOTE

Section 2

The BLACK tape around Section 2 is a reference (11 foot level)
for optional sensor mounts.

Section 2

Collar

FIGURE 2.2-7. 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 Figures 2.2-7 and 2.2-8).

Collar

Guy Ring

Section 3

Collar

FIGURE 2.2-8. Guy Ring, Mast Section 2 and Mast Section 3

Step 8: Remove guy ring from bottom guy kit, PN 21663 (see Figures 2.2-8
and 2.2-9).

7

CM375 Portable 10-Meter Mast

FIGURE 2.2-9. 21663 Bottom Guy Kit

NOTE

Step 9: Place ball end of each guy cable into its slot in the guy ring and place
guy ring into coupler of Section 3 (see Figure 2.2-10).

FIGURE 2.2-10. Guy Cable Inserted into Guy Ring

Only one of the three cable ends is shown.

8

CM375 Portable 10-Meter Mast

Step 10: Slide coupler into Section 2 mast and assemble collars, as shown in
Figure 2.2-11.

FIGURE 2.2-11. Mast Section 3 and Guy Ring/Collar Assembly

Step 11: Slide coupler end of Section 4 into the top of Section 3, and secure
with remaining components from hardware bag (see Figure 2.2-12).

Section 3

Coupler

FIGURE 2.2-12. Mast Section 4 Ready to be

Installed in Mast Section 3

9

CM375 Portable 10-Meter Mast

Step 12: Remove collars from Section 5 (see Figure 2.2-13).

Collar

Collar

FIGURE 2.2-13. Mast Section 5

Step 13: Slide mast into Section 4 and assemble collars, as shown in Figure

2.2-14.

10

FIGURE 2.2-14. Mast Section 5 Installed in Mast Section 4

CM375 Portable 10-Meter Mast

Step 14: Remove guy collar from 21661 guy kit (see Figure 2.2-15).

FIGURE 2.2-15. 21661 Guy Kit

Step 15: Place guy cable ball ends into guy ring and then slide ring down mast
to collar (see Figure 2.2-16).

FIGURE 2.2-16. Mast Section 5 and Guy Ring/Collar Assembly

11

CM375 Portable 10-Meter Mast

2.3 Lightning Rod Assembly and Mounting Instrumentation

Step 1: Fit lightning rod assembly (from PN 21660) to top of Section 5 mast
(see Figure 2.3-1).

FIGURE 2.3-1. Lightning Rod Assembly

Step 2: Place clamp onto top of mast Section 5 and tighten (see Figure 2.3-2).

Step 3: Insert rod into clamp and tighten (see Figure 2.3-2).

12

FIGURE 2.3-2. Installed Lightning Rod

Step 4: Assemble enclosures, sensors and tie cables to mast, as required.

2.4 Anchor Installation

FIGURE 2.4-1. Tape Measure in Slot for South Anchor

CM375 Portable 10-Meter Mast

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 2.4-1).

Step 2: At 20 ft, install the duckbill anchor with drive rod (see Figure 2.4-2).
The anchor needs to be driven into the ground at a 45° angle (see Figure 2.4-3).
Drive anchor until the loop or metal ring is several inches above the ground.

Rod

Anchor

Anchor
Cable

FIGURE 2.4-2. 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.

13

CM375 Portable 10-Meter Mast

45°

FIGURE 2.4-3. Anchor Driven into Ground at 45° Angle

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 2.4-4).

Anchor

FIGURE 2.4-4. Locking Anchor

Step 4: Fill-in the hole around the cable or threaded rod with loose dirt and
tamp firm.

14

CM375 Portable 10-Meter Mast

r

Step 5: Repeat process for the NE (Figure 2.4-5) and NW anchors.

NE

FIGURE 2.4-5. Tape Measure in Slot for North East Anchor

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 2.4-6).

Open turnbuckle to widest setting.

Guy Cable Wedge

FIGURE 2.4-6. Turnbuckle Fastened to Guy Cable and Anchor

Ancho

15

CM375 Portable 10-Meter Mast

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 Figures 2.4-7 and 2.4-8).

NOTE

Do not connect the SOUTH cables at this time.

FIGURE 2.4-7. Top and Bottom Guy Cables Fastened to an Anchor

16

FIGURE 2.4-8. Rope Racket Assists Assembly

CM375 Portable 10-Meter Mast

Step 8: Course adjustments to cable length are made by loosening screw
clamp and then releasing wedge with a blade screwdriver (see Figure 2.4-9).
This allows the cable to be adjusted through the wedge clamp.

NOTE

Retighten screw when adjustment is complete.

FIGURE 2.4-9. Adjusting Cable through Wedge Clamp

2.5 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 2.5-1). If using rope ratchets, adjust them to allow further
steps.

FIGURE 2.5-1. Raising the Mast

17

CM375 Portable 10-Meter Mast

Step 2: Attach SOUTH cables to anchor. While first person holds mast and
uses a pole level, the second person adjusts each of the bottom guy cable
wedge clamps, maintaining level in all directions (see Figure 2.5-2). The rope
ratchet can be used to temporarily remove the load from the wedge assembly
during wedge adjustments.

FIGURE 2.5-2. Pole Level Ensures Vertical 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 2.5-3).

18

FIGURE 2.5-3. Adjusting Turnbuckles

CM375 Portable 10-Meter Mast

Step 5: Adjust each cable turnbuckle to maintain plumb and increase cable
tension. A deflection of 3 inches when using a 4.4 pound (2N) perpendicular
force, 68 inches from the duckbill anchor loop equates to 100 pounds of
tension in the cables (see Figure 2.5-4).

3. Maintenance

FIGURE 2.5-4. Guy Cables with 100 lbs of Tension

Step 6: After tensioning the top guy cables, recheck the bottom guy cables.

Adjust, as necessary.

Check and adjust guy cable tension at least once a month, and after wind gusts
exceeding 50 mph.

19

CM375 Portable 10-Meter Mast

20

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