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Leica GDF322 Tribrach with Optical Plummet

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Surveying Equipment Accessories available call for prices

Tribrach with optical plummet

Tribrachs play an important role in measurement accuracy.

Torsional rigidity is the most important feature of a tribrach and allows for precision in measurement.

All Leica Tribrachs are tested for high levels of torsional rigidity.

Highly durable and capable of working in the most extreme conditions.

Please call us on 07064649087 to discuss your requirements.

Whatever your needs, you’ll find what you are looking for.

Leica GDF322 Tribrach with Optical Plummet

Kindly call us for pricing

Tribrach with optical plummet

Tribrachs play an important role in measurement accuracy.

Torsional rigidity is the most important feature of a tribrach and allows for precision in measurement.

All Leica Tribrachs are tested for high levels of torsional rigidity.

Highly durable and capable of working in the most extreme conditions.

Please call us on 07064649087 to discuss your requirements.

Whatever your needs, you’ll find what you are looking for.

Leica GDF111-1 basic tribrach without optical plummet.

Suitable for TPS instruments with an angular accuracy of greater than 3″.

Leica GDF322 Tribrach with Optical Plummet

The footscrews have a large diameter which permits fine adjustment even when wearing work gloves.

NOTE: Not supplied with optical plummet

Torsional Stiffness: < 3″
Weight: 780g

Components of a tribrach

View through an optical plummet of a prism adapter.

The head of a surveyor’s tripod with the screw for mounting the tribrach.
The device consists of two triangular metal plates connected at their corners by leveling thumbscrews, a bubble level, a locking mechanism and often an optical plummet. The centre of the bottom plate of the tribrach has a 5/8-11 UNC thread bolt hole which is used to attach the tribrach to the tripod. The top plate has three small holes or slots spaced 120˚ apart above leveling thumbscrews, and a locking mechanism which enables a survey instrument or target to be accurately placed on the tribrach and locked in place.

The optical plummet has either a bullseye or cross hair sight for positioning the instrument over a survey marker or ground control point. The older tribrachs required a plumb line to allow them to be positioned vertically over a point and took longer to set up.

Some modern total stations have an integral laser plummet built in.

Using a Tribrach

Using an optical plummet. Here the tribrach is not central on the tripod plate as it is being aligned over the marker

Laser reflector target on tribrach and marker column.
The process is iterative between horizontal position and top plate level, because they are interactive. The following general process is followed:

The tribrach is attached to the tripod and placed over the marker.
Looking through the optical plummet pick up two of the tripod legs and position the cross hairs over the marker. Tread all three legs into the grass, bitumen, concrete.
Look through the optical plummet and using the thumbscrews put the cross hairs back over the marker.
Adjust the level of the tribrach by slackening the tripod screws and sliding the legs. Re-center the cross hairs using the thumb screws, then fine-tune the level using the tripod legs. Once the tribrach is nearly centered over the marker, level the tribrach the last little bit using the thumbscrews.

Slacken the tribrach from the tripod head and slide it the last 4-5mm so that it is centered over the marker and is level.
If the target over which the instrument is to be placed is roughly at the same elevation as the tripod feet, the preceding technique is applicable. If there is a considerable difference between the elevation of the target and the elevation of the marker and the instrument bottom plate, such as when the target is in a deep hole, or on a Bilby tower, the target will appear to move laterally by a large distance in the optical plummet as the tribrach level is adjusted.

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