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 | |
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 |
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 | |
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 | |
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 |
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 | |