SECO 2159-01-BLK Single Prism Traverse Kit - Black

The SECO 2159-01-BLK Single Prism Traverse Kit is a complete precision surveying setup designed for control work, traversing, construction layout, and other applications requiring accurate prism positioning over a known point.

The kit combines a 62 mm silver-coated prism, reversible tilting target, precision rotating tribrach adapter, and three-screw leveling tribrach. The prism provides selectable 0 mm, -30 mm, and -40 mm offsets, while the target incorporates a sighting collimator for precise orientation toward the total station.

The included rotating tribrach adapter features a 2.5x twist-focus optical plummet, 60-second adjustable plate vial, and precision-machined axis capable of 360° rotation. A black tribrach and hard-shell carrying case complete the system.

Key Features

• Complete single-prism traverse kit
• SECO part number: 2159-01-BLK
• Includes 62 mm silver-coated prism
• Prism part number: 6400-10
• Prism angle deviation of less than 5 arc seconds
• Adjustable and reversible tilt target
• Integrated sighting collimator for precise pointing
• Selectable 0 mm, -30 mm, and -40 mm prism offsets
• Includes rotating tribrach adapter
• Adapter part number: 2153-10-BLK
• Compatible with prisms using a 24.9 mm bayonet base
• Precision-machined rotating axis
• Full 360° adapter rotation
• 2.5x twist-focus optical plummet
• 60-second adjustable plate vial
• Over-point accuracy of 0.5 mm at 1.5 m
• Includes three-screw leveling tribrach
• Tribrach part number: 2153-04-BLK
• 8-minute circular vial
• 5/8-11 tribrach base thread
• Black tribrach and adapter
• Includes hard-shell carrying case

62 mm Silver-Coated Prism

The SECO 2159-01-BLK includes a 62 mm prism with a silver-coated canister:

• SECO prism p/n: 6400-10
• Prism diameter: 62 mm
• Prism angle deviation: <5 arc seconds

The low angular deviation supports precision total station measurements where consistent prism geometry is important.

0 mm, -30 mm, and -40 mm Prism Offsets

The adjustable target provides three prism offset positions:

• 0 mm
• -30 mm
• -40 mm

This allows the assembly to be configured for different instrument and survey workflows without requiring a completely different prism system.

The correct prism constant must be selected in the total station or field software before collecting measurements. Instrument manufacturers may use different prism-constant conventions, so the entered value should always be verified for the specific equipment being used.

Adjustable and Reversible Tilt Target

The prism is mounted in an adjustable tilt target that can be reversed according to the required configuration.

Tilting allows the prism face to be aimed toward the total station when working at different elevations or vertical angles.

This is particularly useful during traverse work, where targets may need to remain accurately centered over established control points while being observed from multiple instrument positions.

Integrated Sighting Collimator

The tilt target incorporates a sighting collimator to assist with precise pointing.

The collimator gives the target operator a direct visual reference for orienting the prism toward the instrument, helping ensure the reflective surface is properly aligned during longer or more demanding observations.

Rotating Tribrach Adapter

The kit includes the SECO 2153-10-BLK rotating tribrach adapter.

This adapter is compatible with prisms using a:

• 24.9 mm bayonet base

The precision-machined axis rotates through a full 360°, allowing the prism assembly to be oriented without shifting the tribrach or disturbing the centered setup.

This is especially useful during traverse observations where the prism must be turned toward different instrument stations.

2.5x Twist-Focus Optical Plummet

The rotating tribrach adapter features a 2.5x optical plummet with twist focusing.

The optical plummet allows the operator to accurately center the assembly over a ground point, nail, monument, or control mark before measurements begin.

Twist focusing helps provide a clear view of the point during setup.

60-Second Adjustable Plate Vial

A 60-second adjustable plate vial is integrated into the rotating tribrach adapter.

The vial provides a sensitive leveling reference for accurately positioning the prism assembly. Its adjustable design allows it to be checked and calibrated as part of routine equipment maintenance.

360° Precision Rotation

The tribrach adapter incorporates a precision-machined axis that rotates:

• 360°

This allows the prism to be turned toward different instrument positions while maintaining the same centered setup over the control point.

The feature is particularly useful for traversing, control networks, monitoring, and multi-direction observations.

Precision Over-Point Setup

SECO specifies an over-point accuracy of:

• 0.5 mm at 1.5 m

This high level of centering precision makes the system well suited for traverse and control applications where accurate setup over established points is essential.

SECO also specifies a height range of approximately:

• 180 to 200 mm

The exact configured height should be confirmed before recording the target height in the total station or field software.

Three-Screw Leveling Tribrach

The kit includes the SECO 2153-04-BLK tribrach.

Features include:

• Three-screw leveling
• Center-line reference
• 8-minute circular vial
• 5/8-11 base thread
• Black finish

The three leveling screws provide fine adjustment for accurately leveling the prism assembly before observations are collected.

8-Minute Circular Vial

The included tribrach has an 8-minute circular vial for initial leveling.

The circular vial provides a quick reference for bringing the assembly close to level before the more sensitive plate vial on the adapter is used for final adjustment.

Standard 5/8-11 Mounting

The tribrach uses a standard:

• 5/8-11 base thread

This provides compatibility with a wide range of professional survey tripods, instrument mounts, and other equipment using the standard surveying connection.

Black Tribrach and Adapter

Both the tribrach and rotating tribrach adapter are supplied in Black.

Included components:

• 2153-10-BLK rotating tribrach adapter
• 2153-04-BLK tribrach

The matching finish creates a complete, coordinated traverse setup.

Hard-Shell Carrying Case

A hard-shell case is included for transportation and storage.

The case helps protect the prism, tribrach, rotating adapter, and target components while keeping the complete traverse kit organized between survey setups.

Ideal Applications

• Precision traverse surveys
• Control-point establishment
• Control networks
• Construction layout
• Boundary surveying
• Topographic surveying
• Monitoring surveys
• Deformation monitoring
• Engineering surveys
• High-accuracy total station work
• Multi-station prism observations

Technical Specifications

What’s Included

• 1 × SECO 62 mm silver-coated prism
  • P/n: 6400-10
• 1 × Adjustable and reversible tilt target with sighting collimator
• 1 × SECO rotating tribrach adapter
  • P/n: 2153-10-BLK
• 1 × SECO three-screw leveling tribrach
  • P/n: 2153-04-BLK
• 1 × Hard-shell carrying case
  • P/n: 2159-050
• Complete kit p/n: 2159-01-BLK

Tripod, total station, and other surveying accessories are sold separately.

Complete Precision Traverse Setup

The SECO 2159-01-BLK combines a sub-5-arc-second 62 mm prism, three offset options, reversible tilt target, precision rotating adapter, optical plummet, and leveling tribrach into one complete traverse system. Its 360° rotation and precise over-point capability make it particularly well suited for control work and high-accuracy total station surveying.