Campbell CM375 Instruction Manual - Cm375 Portable 10-Meter Mast
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
1
: 85 mph (136 km h
-1
)
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
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