The standard Borehole Pressure Cell (BPC) is used to measure rock stress changes and is designed to be grouted inside a borehole. The BPC is manufactured from two steel plates welded together around their periphery. The plates are deformed into a “dog bone” configuration so that they can be expanded easily, without damage to the welds. Hydraulic oil fills the space between the two plates and a high-pressure stainless steel tube connects the plates to a stainless steel pressure gage and/or a pressure transducer.
|20, 35, 75 MPa|
|Resolution||0.25% of range (approximately)|
|Accuracy¹||0.25% F.S. (gage); 0.1% F.S. (VW transducer)|
|Borehole Size||57 mm|
|Temperature Range²||−20°C to +80°C|
|L × W × H||210 × 51 × 6 mm|
¹VW transducer accuracy established under laboratory conditions.
²Other ranges available on request.