Photo of Model 4400.

Embedment Jointmeters

Model 4400

The Model 4400 Embedment Jointmeter is designed for use across construction joints such as those between adjacent blocks in a concrete dam. It is normally embedded across the joint to monitor the expansion or contraction of the joint. The use of internal universal joints allows for a degree of shearing motion.

Specifications
Standard Ranges¹ 12.5, 25, 50, 100 mm
Resolution 0.025% F.S.
Accuracy ±0.1% F.S.
Nonlinearity <0.5% F.S.
Temperature Range −20°C to +80°C
Length × Diameter 406 × 51 mm

¹Other ranges available on request.

Photo of Model 4410.

Strandmeters

Model 4410

The Model 4410 Strandmeter is designed to measure strains in tendons and steel cables. Two clamps at each end of the strandmeter hold it firmly onto the cable. Various size clamps are available.

Specifications
Standard Range 20,000 µε
Resolution <5 µε
Accuracy ±0.1% F.S.
Nonlinearity <0.5% F.S.
Temperature Range −20°C to +80°C
Length × Diameter 203 × 45 mm

Photo of Model 4420.

Crackmeters

Model 4420

The Model 4420 Crackmeter is intended to measure movement across surface cracks and joints. It is installed by grouting, bolting, or bonding two threaded anchors (with ball joints) on opposite sides of the crack and then attaching the ends of the gage to the anchors.

Specifications
Standard Ranges¹ 12.5, 25, 50, 100, 150 mm
Resolution 0.025% F.S.
Accuracy ±0.1% F.S.
Nonlinearity <0.5% F.S.
Temperature Range −20°C to +80°C
Diameter 8 mm (shaft) / 25 mm (coil)
Length 318, 362, 527 mm (transducer)

¹Other ranges available on request.

Photo of Model 4422.

 

Micro Crackmeter

Model 4422

The Model 4422 is a miniature crackmeter intended to measure displacements across surface cracks and joints. It has been specially designed for applications where access is limited and/or where monitoring instrumentation is to be as unobtrusive as possible (e.g. on historical structures or buildings).

Specifications
Standard Range 3 mm (±1.5 mm)
Resolution 0.025% F.S.
Accuracy ±0.1% F.S.
Nonlinearity <0.5% F.S.
Temperature Range −20°C to +80°C
L × Diameter 120 × 7.9 mm

Photo of Model 4425.

Convergence Meters

Model 4425

The Model 4425 Convergence Meter is used to monitor closures in underground excavations, tunnels, etc. It is comprised of a spring tensioned transducer, turnbuckle, connecting rod (stainless steel, fiberglass or graphite), rod clamp, and a pair of stainless steel eyebolts.

Specifications
Standard Ranges¹ 25, 50,100, 150 mm
Resolution 0.025% F.S.
Accuracy ±0.1% F.S.
Nonlinearity <0.5% F.S.
Temperature Range −20°C to +80°C
Transducer Length 356, 508, 838 mm (transducer)

¹Other ranges available on request.

Photo of Model 4427.

Long Range Displacement Meters

Model 4427

The Model 4427 Long Range Displacement Meter is ideally suited for the measurement of large displacements associated with landslides. The Model 4427 can also be used for monitoring the movement of boulders, snow, etc., on unstable slopes.

Specifications
Standard Range 1, 2 m (without resetting)
Resolution 0.025% F.S. (0.25 mm for 1 m range)
Accuracy <0.1% F.S.
Temperature Range −30°C to +60°C
L × W × H 610 × 152 × 152 mm

Photo of Model 4430

Soil Strain Meters

Model 4430

The Model 4430 Soil Strain Meter with flanged ends is designed to measure longitudinal deformation in dams and embankments. It can also be grouted or held in place by hydraulic anchors to measure deformations in boreholes (over the gage length). Gage lengths from 0.5 to 100 meters are available.

Specifications
Standard Ranges¹ 12.5, 50,100, 150, 300 mm
Resolution 0.02% F.S.
Accuracy ±0.1% F.S.
Nonlinearity <0.5% F.S.
Temperature Range −20°C to +80°C
Length × Diameter varies × 50 mm

¹Other ranges available on request.

Please Note: Geokon maintains an ongoing policy of design review and reserves the right to amend products and specifications without notice.