2.Models

The following sections describe in brief the various embedment strain gauges available from geokon.

2.1Models 4200 and 4200L

Model 4200 is designed primarily for long-term strain measurements inside mass concrete, in structures such as foundations, piles, bridges, dams, containment vessels, tunnel liners, etc. This strain gauge features a 3,000 microstrain range, with a length of 152 mm (6").

The 4200L is a low-modulus version, designed to enable early curing strains to be measured.

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Figure 2: Model 4200 Vibrating Wire Strain Gauge

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Figure 3: Model 4200L Vibrating Wire Strain Gauge

2.2Models 4200-6 and 4200-7

geokon Models 4200-6 and 4200-7 are extended range strain gauges. The Model 4200-6 features a 5,000 microstrain range, while the Model 4200-7 features a 10,000 microstrain range. The length of both gauges is 152 mm (6”).

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Figure 4: Model 4200-6 Vibrating Wire Strain Gauge

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Figure 5: Model 4200-7 Vibrating Wire Strain Gauge

2.3Model 4202

Model 4202 is designed for embedment in grout, mortar, and small aggregate concrete. It is also useful for model studies. The length of the 4202 gauge is 50 mm (2').

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Figure 6: Model 4202 Vibrating Wire Strain Gauge

2.4Model 4204

Model 4204 is designed to be embedded in concrete where space may be limited. The length of the gauge is 101 mm (4”).

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Figure 7: Model 4204 Vibrating Wire Strain Gauge

2.5Model 4210

Model 4210 is designed for embedment in large aggregate concrete, greater than 19 mm (¾"). The standard gauge length is 254 mm (10"), other gauge lengths available include: Model 4212: 305 mm (12"), and Model 4214: 356 mm (14").

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Figure 8: Model 4210 Vibrating Wire Strain Gauge