File Name
Crack Meters
Resource Type
Brochure| Language | Version | Download |
|---|---|---|
| English | EXB0008 |
|
Crack Meter
RST’s Crack Meters are designed to measure movement across surface cracks and joints.
Overview
RST’s Crack Meters are designed to measure movement across surface cracks and joints. They are easily installed by grouting, bolting or bonding the two threaded anchors (with ball joints) or other mounts, on either side of the crack/joint, and then reattaching the anchors to the sensor.
Crack Meters are available in the following configurations:
-Vibrating Wire
-Submersible (up to 200 m) versions are also available (for example, on the upstream perimeter joint of CFRD dams).
VIBRATING WIRE SENSOR SPECIFICATIONS
| ITEM | SPECIFICATION |
| Operating Temperature | -20°C to 80°C |
| Resolution | <0.01% F.S. (readout dependent) |
| Range | 25, 50, 100, 150, 200 mm |
| Accuracy | <0.1% F.S. |
| Non-Linearity | <0.5% F.S. |
| Thermistor Type | NTC 3K Ohms @ 25°C |
CABLE SPECIFICATION – FOR VIBRATING WIRE CRACK METERS
| PART # | DESCRIPTION |
| EL380004 | Two twisted pairs cable with polyurethane jacket |
Crack Meters are commonly used for:
- Monitor crack separation or convergence, in concrete structures.
- Monitor joints for movement caused by nearby geotechnical activity.
- Alarm triggering when separation or convergence of two reference points reach a preset critical rate or value – requires use of data logger and RST’s GeoViewer Software.
View illustrations on how Crack Meters are used for:
STANDARD CRACK METER (WITH GROUTABLE ANCHORS)
| RANGES | PART # | END TO END COLLAPSED LENGTH (MM) | END-TO-END AT 50% EXTENSION (MM) |
| 25 mm (1.0 in.) | VWCM025 | 260 | 278 |
| 50 mm (2.0 in.) | VWCM050 | 323 | 353 |
| 100 mm (4.0 in.) | VWCM100 | 461 | 516 |
| 150 mm (6.0 in.) | VWCM150 | 526 | 606 |
| 200 mm (8.0 in.) | VWCM200 | 734 | 839 |
SUBMERSIBLE ORDERING INFO: (WITH UNIVERSAL ENDS)
| DESCRIPTION | PART # | END TO END COLLAPSED LENGTH (MM) | END-TO-END AT 50% EXTENSION (MM) |
| 25 mm (1.0 in.) | VWCM025S | 398 | 415 |
| 50 mm (2.0 in.) | VWCM050S | 486 | 516 |
| 100 mm (4.0 in.) | VWCM100S | 682 | 738 |
| 150 mm (6.0 in.) | VWCM150S | 797 | 877 |
| 200 mm (8.0 in.) | VWCM200S | 1051 | 1156 |
| 300 mm (12.0 in.) | VWCM300S | 1408 | 1558 |
File Name
Vibrating Wire Crack Meter Instruction Manual
Resource Type
Manual| Language | Version | Download |
|---|---|---|
| English | EXM0036O |
|
Speak with an Expert
I’m very happy with the quality of the instrumentation and technical support from RST, as always. They worked with us from the initial stages of the project to ensure that we were fully prepared and equipped to use the RSTAR network for the first time. They delivered everything within the tight project time frame to ensure that there were no delays on site, and the submersible tilt meters looked like new even after over twelve months of being submerged in Thames water!
-Richard Lipscombe, BEng (Hons), Director & Principle Consultant - RL Geotechnical Ltd