Double production caliper

The CNPS double X-Y caliper is used centrally in the production recording tool chain. The caliper incorporates proven roller centralization technology and has a pair of caliper arm mechanisms arranged at 90 degrees to each other to measure the inside diameter of the housing in the X and Y axes.



The caliper is spring loaded and follows the inside diameter of the tube when in the hole. It opens completely when leaving the casing to enter the casing. Each arm functions as an independent unit exerting a constant radial force in any housing diameter. Shielded LVDT sensors inside the main shaft accurately inductively measure the position of coupled collars external to the shaft. The position of the clamp blocks is linked to the identification of the tube.


Determination of diameters open hole. Identification of ID to correlate with changes in holdup interfacing and tool combinations Simultaneous operation with other production records 1 3/16 UN 12 upper and lower thread. Compatible with Sondex and OPTIONS Springbow version for open hole Ultrawire™ (UW) toolbus or Memory toolbus (Mbus). Special heads to meet customer specifications. Extended arms to increase reach depending on the customer.


PDC Telemetry XTU or UMT

Pressure (max) 105MPa

Temperature (max) 177°C

Measuring range 2″ – 9″ diameter

Resolution 0.015″

Accuracy 0.1″ < 150°C 0.2″ < 165°C 0.3″ <177°C

Voltage (nominal) 18VDC

Current <24mA

Length 952mm

Measuring point 9.75-11.25″(X) 6.75-8.25″ (Y)

Diameter 43mm

Weight 6.6 kg

Material Corrosion Resistance Throughout End Thread(Top/Bottom) 13/16″ 12 UN2A GO End Connector(Top/Bottom) Single 4mm Banana Connector.

Weight 1 kg


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