Jointmeters • Strandmeters • Crackmeters • Convergence & Displacement Meters
 

Photo of Model 4400

 

 

Model 4400 Embedment Jointmeter
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, 25, 50 mm
Sensitivity 0.025% F.S.
Accuracy ±0.1% F.S.
Nonlinearity < 0.5% F.S.
Temperature Range –20°C to +80°C
Length x Diameter 406 x 51 mm
¹Other ranges available on request

Photo of 4410  

Model 4410 Strandmeter
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 microstrain
Sensitivity < 5 microstrain
Accuracy ±0.1% F.S.
Nonlinearity < 0.5% F.S.
Temperature Range –20°C to +80°C
Length x Diameter 203 x 45 mm

Photo of 4420  

Model 4420 Crackmeter
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, 25, 50,100 mm
Sensitivity 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 (Transducer) 318, 362, 527 mm
¹Other ranges available on request

Photo of 4425  

Model 4425 Convergence Meter
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 mm
Sensitivity 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
¹Other ranges available on request

Photo of 4427  

Model 4427 Long Range Displacement Meter
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 Ranges 0.5, 1, 2 m (without resetting)
Sensitivity 0.025% F.S. (0.25 mm for 1m range)
Accuracy < 0.1% F.S.
Temperature Range –30°C to +60°C
L x W x H 610 x 152 x 152 mm

Photo of 4430  

Model 4430 Soil Strain Meter
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 25, 50,100 mm
Sensitivity 0.02% F.S.
Accuracy ±0.1% F.S.
Nonlinearity < 0.5% F.S.
Temperature Range –20°C to +80°C
Length x Diameter varies x 50mm
¹Other ranges available on request