The Model 4300 Vibrating Wire Borehole Stressmeters are designed to measure stress changes in rock and can be installed in boreholes up to 100 feet deep. The Stressmeter consists of a high strength steel proving ring wedged tightly across one diameter inside a borehole and a vibrating wire tensioned across the other diameter inside the stressmeter. Changes in rock stress cause a related change in the resonant frequency of vibration of the tensioned wire providing output which is read by the Model GK-405 GK-405 Vibrating Wire Readout.
Specifications
Range in Compression: 70 MPa
Range in Tension: 3 MPa
Resolution: 14 to 70 KPa
Temperature Range²: −20°C to +80°C
Borehole Diameter: 4300-EX | 37 to 39 mm
                             4300-BX | 58 to 61 mm
                             4300-NX | 74 to 77 mm

Geokon, Incorporated, 48 Spencer Street, Lebanon, New Hampshire, 03766 · USA. Tel.: 1(603)448-1562, FAX: 1(603)448-3216, e-mail: info@geokon.com