3" dual analogue VSP sonde. Over 500 tools in use since introduction in 1997. Use with any of our gamma ray tools.

The ASR-1 borehole geophone is our most well established, tried and tested product, of which over five hundred are now in use worldwide. Although often used in 'dual-analogue' form the tools can be easily upgraded, by the inclusion of a digitiser module,to operate within a digital Geochain array.

The ASR geophone is a compact three component mechanically operated down-hole geophone. It is designed for use in wells up to 20,000 psi and 200C and provides a fast arm cycle time with an arm force to weight ratio of 5:1.

The standard arm will accommodate boreholes from 5" to 13", the short arm will accommodate boreholes from 3-1/2" to 9" and an extended arm can be used to increase this range to 22". The locking force is constant to within 20% throughout its operating range and will lock into 9 5/8" casing in fifteen seconds when fitted with the standard arm.

The tool is provided with a three component gimballed package as standard using one high sensitivity SM4 high temperature element per axis. The gimbal assembly will faithfully follow any borehole deviation from vertical through to horizontal and slightly beyond.

The tool has been designed so as to require very little servicing. Routine servicing can be performed in a few minutes and even a complete overhaul can be accomplished in less than an hour.

Visit the Datasheets page to download additional information in pdf format.