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QL40-CAL – 3-Arm Caliper

Caliper Borehole Logging Probe with Optical Televiewer data


The QL40-CAL Caliper probe records a single continuous borehole diameter log by means of three mechanically coupled arms in contact with the borehole wall. The 3 arm caliper measurement is a useful first log to determine the borehole condition before running other well logging probes.


Operating Conditions

Borehole Fluid
[X] Water
[X] Mud
[X] Dry

[X] Uncased
[X] PVC Borehole
[X] Steel

[_] Required
[X] Not Necessary

Features & Benefits

Specifications – Metric/English

Specification Metric Imperial
Diameter 42 mm 1.7 inches
Length 1.78 m 70.3 inches
Weight 10 kg 22 lbs.
Max. Temp. 70ºC 158ºF
Max. Pressure 200 bar 2900 psi


Sensor: Micro-processer controlled potentiometer
Standard Arms: 50 to 406 mm/ 2 to 16 inch borehole diameter
Extended Arms: up to 736 mm/ up to 29 inch borehole diameter
Accuracy: 1 mm
Resolution: 0.5 mm

QL Stack Possibilities


Data Sheet
User Guide

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