LI-COR 7900-300 User manual

Heavy Duty
Adjustable Tripod
Instruction Manual

Heavy Duty Adjustable Tripod
Instruction Manual
LI-COR Biosciences
4647 Superior Street
Lincoln, Nebraska 68504
Phone: [phone]
Toll free: 800-447-3576 (U.S. and Canada)
[e-mail]
Regional Offices
LI-COR Biosciences GmbH
Siemensstraße 25A
61352 Bad Homburg
Germany
Phone: [phone]
[e-mail]
LI-COR Biosciences UK Ltd.
St. John’s Innovation Centre
Cowley Road
Cambridge
CB4 0WS
United Kingdom
Phone: [phone]
[e-mail]
LI-COR Distributor Network:
www.licor.com/env/distributors

Notice
The information contained in this document is subject to change without notice.
LI-COR, INC. MAKES NO WARRANTY OF ANY KIND WITH REGARD TO THIS MATERIAL, INCLUDING, BUT
NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE.
LI-COR, Inc. shall not be liable for errors contained herein or for incidental or consequential damages in connection with
the furnishing, performance, or use of this material. This document contains proprietary information which is protected
by copyright. All rights are reserved. No part of this document may be photocopied, reproduced, or translated to another
language without prior written consent of LI-COR, Inc.
LI-COR is a registered trademark of LI-COR, Inc. All other trademarks or registered trademarks are property of their
respective owners.
Printing History
Publication Number: 988-12678
© Copyright 2013 to 2018, LI-COR, Inc. All rights reserved.
Build Date: Thursday, February 28, 2019
New editions of this manual will include all updates. An update addendum may be used between editions to provide up-
to-date information. Revisions are indicated by the revision number. Minor updates, which do not alter the meaning of
the content, will be incorporated without affecting the revision number.
Publication Date Changes
December 2012 First Edition
November 2014 Minor changes, clarify tools list.
January, 2018 Removed obsolete URLs; added 24 mm washer.
Notes on Safety
This LI-COR product has been designed to be safe when operated in the manner described in this manual. The safety of
this product cannot be guaranteed if the product is used in any other way than is specified in this manual. The product is
intended to be used by qualified personnel. Read this entire manual before using the product.
Equipment markings:
The product is marked with this symbol when it is necessary for you to refer to the manual or
accompanying documents in order to protect against injury or damage to the product.
WARNING Warnings must be followed carefully to avoid bodily injury.
CAUTION Cautions must be observed to avoid damage to your equipment.
Manual markings:
Warning Warnings must be followed carefully to avoid bodily injury.
Caution Cautions must be observed to avoid damage to your equipment.
Note Notes contain important information and useful tips on the operation of your equipment.
ii

iii
Contents
Section 1. General Information
Safety Information 1-1
Precautions 1-2
Site Selection 1-4
Soil Conditions 1-5
Loading the Tripod 1-6
Components 1-8
Tripod 1-8
Guy Wire Kit 1-10
GroundingKit 1-11
Component List 1-12
Tools 1-13
Section 2. Assembling the Tripod
Legs and Base 2-1
Mast and Guy Wires 2-4
Anchor the Tripod 2-9
Section 3. Maintenance
Monthly 3-1
Every 6 Months 3-1
Section 4. Tripod Accessories
Gas Analyzer and Sonic Anemometer Mounting Hardware 4-1
Cross Arm Kit 4-2
Light Sensor and Radiometer Mount 4-2
Appendix A. Specifications
Appendix B. Warranty

iv

Section 1.
General Information
The 7900-300 Heavy Duty Adjustable Tripod is a robust scientific instrument plat-
form designed to support LI-COR® eddy covariance systems and sensor arrays in
long-term field deployments. It can accommodate a simple eddy covariance system,
consisting of an LI-7500DS and a sonic anemometer, or a fully outfitted system
with an LI-7200RS, 7200-101 Flow Module, LI-7700 CH4Analyzer, ancillary
sensors, a Biomet system, and more. It is designed withstand extreme outdoor con-
ditions, including high wind conditions.
Safety Information
The 7900-300 Heavy Duty Adjustable Tripod has been designed to be safe when
operated in the manner described in this manual. The safety of this product cannot
be guaranteed if the product is used in any other way than described in this
manual. Be sure to read and understand all of the safety information included in
this manual.
The equipment includes the following markings:
This symbol indicates that the user must read the instruction manual prior
to assembling or using the tripod.
This symbol indicates that it is mandatory to check for overhead power lines
prior to assembling the tripod.
1-1Heavy Duty Adjustable Tripod

Section 1. General Information
This symbol indicates that the tripod is not suitable for stepping or
climbing.
This label indicates that users should never lean a ladder against the tripod.
Precautions
Warning: Read all the instructions in this manual prior to assembling, moving,
or disassembling the tripod.
Warning: Never cover or conceal the safety labels that are attached to the tripod.
Doing so could lead one to fail to observe the safety warnings and sustain per-
sonal injury or damage to equipment through the use of the tripod.
Warning: Assembly of the 7900-300 Adjustable Heavy Duty Tripod should be car-
ried out with a minimum of two people. Attempts to assemble the tripod with an
insufficient number of people could lead to personal injury.
Caution: Each stake must withstand 275.8 kg (608 lbs) of lateral load and 392.8
kg (886 lbs) of downward load in order to meet the 161 kph (100 mph) wind
load specification. These conditions are met if the tripod is installed as described
in this manual. If your site conditions deviate from those described here (see Soil
Conditions on page1-5) select an alternate site.
Warning: Conduct a pre-installation site visit to determine proper soil com-
position for a successful tripod installation. Acceptable soil conditions (see Soil
Conditions on page1-5) should be studied in advance of the pre-installation trip.
1-2 Heavy Duty Adjustable Tripod

Warning: The tripod is not suitable for installation on solid rock, soils that are
composed of a rocky substrate, or other hard surfaces that will not allow install-
ation of any of the following: earth anchors, foot stakes, or grounding rod. In
these conditions the tripod may not meet the specifications described in the
instructions and additional measures may be required to stabilize the tripod. If
you have these conditions, consult with a local geotechnical engineer to determ-
ine whether soil at your site is suitable for the tripod.
Warning: The tripod may not be adequate for every situation depending on soil
structure, maximum wind speeds experienced at the site, mast height, or wind
load from the instrumentation. If uncertain, seek the advice of structural and geo-
technical engineers.
Warning: It may not always be possible to plumb the tripod mast with the leg
adjustments. The tripod should not deviate more than 2.3° from true vertical
(approximately 15.2 cm (6 in) of deviation at the top of the upper mast). Make
sure your experiment objectives will not be adversely affected by the deviation
from plumb. If the mast deviates from vertical, it should lean toward the uphill
side. Make sure the feet - especially the downhill feet - are firmly anchored on
solid ground (see Install the Foot Stakes on page2-14).
Warning: Never lean a ladder against the tripod. Doing so may cause
structural failure and result in severe injury, death, and/or damage to
equipment.
Warning: Never step on the legs or leg braces; and never attempt to
climb the tripod. Doing so may result in severe injury, death, and/or
damage to equipment.
Warning: Do not hang from the tripod or cross arm. Doing so may
cause the tripod to fall or fail, and result in severe injury, death, and/or
damage to equipment.
Section 1. General Information
1-3Precautions

Section 1. General Information
Warning: Never weld the tripod or attach a bracket that serves to sup-
port a climbing apparatus. Doing so will compromise the strength of
the tripod and may result in injury, death, and/or damage to equip-
ment.
Site Selection
Careful site selection will provide simpler setup and ensure that your sensors col-
lect high-quality, representative data. The site should accommodate the tripod and
guy wires without interfering with any of the tripod components. The feet require
an unobstructed area with a 2.54 m (8 ft 4 in) diameter. The guy wires require an
area with an 8 m (26 ft 3 in) diameter.
As a general rule, disturb the site as little as possible. Prior to assembling the tripod,
remove any woody brush or tall plants that are in the way of the tripod feet and guy
wires.
Warning: It is dangerous to install the tripod close to overhead power
lines, buried power lines, underground gas lines, or unexploded ord-
nances. Keep a minimum distance of at least 2 times the height of the
tripod (including the lightning rod) between the tripod and nearest
overhead line. Prior to installing the ground rod or anchors, be sure
that there are no underground utilities, power lines, unexploded ordnances, or
other installations at your site.
1-4 Heavy Duty Adjustable Tripod

Soil Conditions
The Heavy Duty Adjustable Tripod can be adequately supported in “average” soil.
“Average” soils are defined as stiff silts and clays containing up to 50% sand and
gravel and having blow counts (N) of 8 to 16 per ASTM D 1586 and unconfined
compressive strengths of 1500 to 3000 pounds per square foot. This soil would be
defined as Class 6 in accordance with the literature of Foresight® Products, the
manufacturer of the Duckbill® Model 68 earth anchors intended for use with the
tripod. The tripod is not to be installed in clean sands or gravels.
Aluminum that is in contact with soil with a pH above 8.5 or below 4.5 (e.g., non-
draining clay-organic and fertilized fields) will corrode faster. If your site has soil
that meets these conditions take measures to physically separate the aluminum feet
from the soil (e.g., place a sheet of sturdy plastic from a heavy duty trash bag
between the metal and soil) and check the condition of the feet and stakes reg-
ularly.
Warning: The tripod is not suitable for installation on solid rock, soils that are
composed of a rocky substrate, or other hard surfaces that will not allow install-
ation of any of the following: earth anchors, foot stakes, or grounding rod. In
these conditions the tripod may not meet the specifications described in the
instructions and additional measures may be required to stabilize the tripod. If
you have these conditions, consult with a local geotechnical engineer to determ-
ine whether soil at your site is suitable for the tripod.
Section 1. General Information
1-5Soil Conditions

Section 1. General Information
Loading the Tripod
Load the tripod according to the maximum weights and frontal areas given below.
Warning: The guy kit, earth anchors, and foot stakes must be installed to meet
the tripod specifications. If these components are not installed, the tripod may
fall or fail, resulting in injury, death, and/or damage to equipment.
Cross Arm (each side)
Maximum Load: 12.25 kg (27 lbs)
Maximum Frontal Area: 0.19 m2(2.05 ft2)
Upper Mast
Maximum Load: 12.25 kg (27 lbs)
Maximum Frontal Area: 0.18 m2(1.94 ft2)
Legs (each)
Maximum Load: 12.25 kg (27 lbs)
Maximum Frontal Area: 0.21 m2(2.26 ft2)
Lower Mast
Maximum Load: 24.5 kg (54 lbs)
Maximum Frontal Area: 0.37 m2(3.98 ft2)
Leg Braces (each)
Maximum Load:12.25 kg (27 lbs)
Maximum Frontal Area: 0.21 m2(2.26 ft2)
1-6 Heavy Duty Adjustable Tripod

Tripod Component Maximum Load Maximum Frontal Area
Cross Arm
Left 12.25 kg (27 lbs) 0.19 m2(2.05 ft2)
Right 12.25 kg (27 lbs) 0.19 m2(2.05 ft2)
Masts
Upper 12.25 kg (27 lbs) 0.18 m2(1.94 ft2)
Lower 24.5 kg (54 lbs) 0.37 m2(3.98 ft2)
Legs
Leg 1 12.25 kg (27 lbs) 0.21 m2(2.26 ft2)
Leg 2 12.25 kg (27 lbs) 0.21 m2(2.26 ft2)
Leg 3 12.25 kg (27 lbs) 0.21 m2(2.26 ft2)
Leg Braces
Leg Brace 1 12.25 kg (27 lbs) 0.21 m2(2.26 ft2)
Leg Brace 2 12.25 kg (27 lbs) 0.21 m2(2.26 ft2)
Leg Brace 3 12.25 kg (27 lbs) 0.21 m2(2.26 ft2)
Total: 134.75 kg (297 lbs) 2.19 m2(23.58 ft2)
Section 1. General Information
1-7Loading the Tripod

Section 1. General Information
Components
The tripod includes the following components. If you have just taken delivery of
your shipment, check to be sure it includes everything that you ordered.
Tripod
Lower Mast part num-
ber : 9879-014
Lower Mast (1): 1.95 m (6'5") long; 6 cm (2.375") Outside Diameter (OD) Sched-
ule 40 Aluminum Pipe 6061-T6.
Upper Mast part num-
ber: 9879-009
Upper Mast (1): 1.95 m (6'5") long; 6 cm (2.375") OD Schedule 40 Aluminum
Pipe 6061-T6.
Legs part number:
9879-0006
Legs (3): 1.75 m (5'9") long; 6 cm (2.375") OD Schedule 40 Aluminum Pipe 6061-
T6.
Leg Extensions part
number: 9879-012
Leg Extensions (3): 0.82 m (2'9") long; 4.8 cm (1.9") OD; Schedule 80 Aluminum
Pipe 6061-T6.
1-8 Heavy Duty Adjustable Tripod

Leg Braces part num-
ber: 9879-015
Leg Braces (3): 0.82 m (2'9") long; 6 cm (2.375") OD Schedule 40 Aluminum
Pipe 6061-T6.
Cross Arm part num-
ber: 9879-010
Cross Arm (1): 1.5 m (59") long, 3.3 cm (1.3") OD Schedule 80 Aluminum Pipe
6061-T6.
Cross Arm Mounting
Assembly part num-
ber 9979-018
Cross Arm Mount Assembly (1): Includes two 3.3 cm M8 U-bolts; two 6 cm M8
U-bolts; eight 13 mm M8 nuts; eight 16 mm or 24 mm M8 flat washers; eight M8
lock washers; mounting plate (9879-020): 163 mm x 104 mm (6.4" x 4.1"); 6.35
mm (0.25"); brackets (9879-043) and stainless steel brackets.
Tripod Hardware part
number 9979-017
Tripod Hardware: Sixteen M12 19 mm, 90 mm long bolts; Sixteen M12 19 mm
nuts; Thirty two M12 washers; Sixteen M12 lock washers; stainless steel.
Tripod feet part num-
ber 9879-011
Feet (3): 28.5 cm x 28.5 cm (11.25" x 11.25").
Foot stakes part num-
ber 9879--028
Foot Stakes (6): 42.5 cm (16.7") length.
Section 1. General Information
1-9Tripod

Section 1. General Information
Guy Wire Kit
Guy Wire Kit part
number: 9979-003
Guy Wire Fitting and Hardware (1): Aluminum 6061-T6.
Guy Wires (3): 7.62 m (25') Zinc-aluminum Coated Steel.
Gripple® Cable Clasps (11): Gripple Plus Medium.
Duckbill® Anchors (4): Model 68 Duckbill® Earth Anchors w/ 168 cm (66 in)
Cable.
Cable Thimbles (7): 0.32 cm (0.125") Open Thimble
Gripple® Release key (2) - "Blue Flag Key"
1-10 Heavy Duty Adjustable Tripod

GroundingKit
Grounding Kit part
number 9979-004
Lightning Rod/Ground Wire Clamps (3): To secure the lightning rod and ground
wire to the mast.
Ground Rod Clasp (1): To secure the ground wire to the ground rod.
Ground Wire (1): 1.22 m (4'), 8 AWG Copper Wire.
Ground Rod (1): 1.83 m (6') long; 1.6 cm (0.63") OD
Lightning Rod (1): 1.83 m (6') long; 0.3 cm (0.12") OD
Spare Parts: Includes extra U-bolts, washers and nuts for the cross-arm, extra 90
and 100 mm bolts, washers, and nuts, and an extra cable thimble.
Section 1. General Information
1-11GroundingKit

Section 1. General Information
Component List
Component Part Number
Tripod
Lower Mast (1) 9879-014
Upper Mast (1) 9879-009
Legs (3) 9879-006
Leg Extensions (3) 9879-012
Leg Braces (3) 9879-015
Feet (3) 9879-011
Foot Stakes (6) 9879-028
Assembly Hardware 9979-017
Cross Arm Mounting Hardware (1) 9979-018
Cross Arm Mounting Plate (1) 9879-020
Cross Arm Brackets (4) 9879-043
Cross Arm (1) 9879-010
Guy Wire Kit 9979-003
Tripod Guy Wires (3) 609-13061
Gripple® Cable Clasps (11) in 609-13061
Gripple® Release Key (2) in 609-13061
Earth Anchors (4) 609-13089
Duckbill® Anchor Drive Rod (1) 609-12946
Guy Wire Fitting (1) 9879-018
Guy Wire Fitting Hardware (1) 9979-019
Cable Thimbles (7) 609-12899
Grounding Kit 9979-004
Lightning Rod (1) 9879-033
Pipe Ground Clamps (3) 609-12523
Ground Rod Clasp (1) 609-12521
Ground Wire (1) 374-12937
Ground Rod (1) 609-12518
Spares Kit 9979-012
Cross Arm Mounting Hardware
Assembly Hardware
Cable Thimble (1)
1-12 Heavy Duty Adjustable Tripod

Tools
We recommend the following tools for assembly. Tools are not provided with the
tripod but can be purchased from a hardware or department store.
Gloves Safety Glasses
19 mm Wrench (13 mm Optional) Torque Wrench and Sockets (19 mm and 13 mm)
Hex Key (8 mm) Standard (Slotted Tip) Screwdriver
Sledge Hammer (2.27 kg, 5 lb or larger) Torpedo Level
Measuring Tape (7.6 m, 25 ft) Fence Post Driver (optional)
Adjustable Wrench (optional) Pliers (optional)
Step Ladder (4 m, 13 ft; to install sensors)
Section 1. General Information
1-13Tools

Section 1. General Information
1-14 Heavy Duty Adjustable Tripod