Met One Instruments 905 User manual
905-9800 REV D Page 1of 8
Technical Support
Should you require support, please consult your printed documentation or our website
www.metone.com to resolve your problem. If you are still experiencing difficulty, you may
contact a Technical Service representative during normal business hours;
Monday –Friday 7:00 a.m. to 4:00 p.m. Pacific Time.
Voice: (541) 471-7111
Fax: (541) 471-7116
E-Mail: service@metone.com
Mail: Technical Services Department
Met One Instruments, Inc.
1600 NW Washington Blvd
Grants Pass, OR 97526
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Table of Contents
Specification:................................................................................................................. 3
Transport Mode............................................................................................................. 3
Erecting.......................................................................................................................... 3
Figure 1 Erecting........................................................................................................... 4
Raising and Lowering................................................................................................... 4
Guying............................................................................................................................ 5
Securing the Tripod to the Ground.............................................................................. 6
Figure 3 Securing to the ground.................................................................................. 6
Tripod Mounting Base Detail........................................................................................ 7
Replacement parts........................................................................................................ 8
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MODEL 905 TRIPOD
OPERATION MANUAL
The Model 905 is a lightweight collapsible tripod designed for rapid deployment and
retrieval. It can be easily transported and erected by a single person. It is intended to support
a complement of weather or atmospheric instrumentation weighting up to 15 pounds at winds
up to 90 mph.
Specification:
Weight 15 pounds
Collapsed length 48 inches
Erected height 6 feet or telescoping to 10 feet. Unit is provided
with guy cables when mast is erected to 10 feet
height.
Instrument mounting Top of mast is same diameter as ¾ inch water
pipe, to fit most cross arm clasps. All other
members are 1-5/16 inch diameter.
Materials Stainless steel or epoxy painted aluminum.
Transport Mode
When collapsed, the tripod legs are folded upward. The stainless steel release pins are
replaced in their holes to prevent loss. The mast is telescoped inward and retained by the
long stainless steel release pin. In this mode the overall length is 48 inches and the overall
diameter is 9 inches. The guy cables are normally removed in this mode to make handling
easier. Place them in the plastic bags provided to avoid tangling and damage.
Erecting
See Figure 1. This is usually easier if the tripod is placed upside down. Remove one of the
stainless steel pins and pivot the leg until the tongue bottoms between the two plates on the
hub; then reinsert the release pin. Repeat for the remaining two legs. Turn the tripod right
side up and stand it on its legs.
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Figure 1 Erecting
Raising and Lowering
At the 6-foot height, the mast release pin will always remain in place to ensure North
orientation. If the 10-foot height is being used, note that the telescoping section has two
aligned holes, one at the top and one further down. Any alignment made with the mast at six
feet will be maintained when the mast is elevated to 10 feet if these holes are used. To raise
the mast, simply remove the pin, slide the mast up until the upper set of holes align and re-
pin.
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Guying
At the 6-foot height, guy cables are not required. At 10 feet the guy cables should be used.
To install the guy cables, simply slip the ball end of the cable into one of the holes at the top
of the mast, bring the cable down through the slot at the bottom of the hole. See Figure 2.
Open the latch at the bottom of the cable and insert the hook into the slit at the bottom of the
appropriate leg. Repeat for all three legs. Do not close the latches at the lower ends of the
cables until all three cables are attached. To lower the mast, it is necessary to first release all
three latches. The guy cables are spring loaded and should never require adjustment.
Figure 2 Guying
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Securing the Tripod to the Ground
The unit will free stand in no-wind conditions. In wind up to 30 mph, the
center tether may be used. See Figure 3.
Figure 3 Securing to the ground
The auger is intended for use in firm soil. If the terrain is soft (i.e. sand or snow) the tether
can be attached to a buried plate. The tether is supplied with an eyebolt, which may be
fastened to a piece of plywood, sheet metal, or other convenient material, then buried. If the
legs sink into soft terrain, likewise attach a piece of wide flat material to each leg with a bolt
through each foot. Foot pads do not get buried.
The unit can also be staked to firm soil with steel re-bar stakes at each foot.
In winds over 30 mph the unit should be bolted or lag screwed to a solid deck. Holes are
provided in the feet for this purpose.
If properly secured to a solid deck and with the guy wires in place, the unit will withstand 90
mph winds.
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Tripod Mounting Base Detail
Fig. 4 Mounting Base Detail of 905 Tripod
Note: The radius dimension does have some tolerance to it as the legs on the tripod can shift
out or in about 3/16 of an inch while in installation.
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Replacement parts
The following replacement parts may be ordered from Met One Instruments.
1. Guy wire kit, MOI#10037
2. Short stainless steel release pin. ¼” X 1” (For legs, 3 required), MOI#790232
3. Long stainless steel release pin. ¼” X 1 ½” (For telescoping mast), MOI#790233
4. Ground tether kit, including: latch, spring, chain, eyebolt and auger. MOI#7090-1
5. Replacement guy wires. 1/16” X 105” S.S. ,MOI#975002
6. Mast Guide (top guide) attached to the fixed (outer) mast housing. MOI#3177
7. Mast Sleeve (bottom guide) attached to the sliding (inner) mast. MOI#3176
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