The AM3K Measuring Device combines in one compact, lightweight unit, both depth measurement and line tension measurement capabilities.

The wireline runs across three steel wheels which creates a force on the load axle normal to the axis of the wireline. The center wheel is a hardened 2.000 ft. (609.600 mm) circumference wheel with a 3/8″ groove. This wheel is slightly offset from the other two which creates a slight bend in the cable. As wireline tension increases the small offset creates a corresponding bending force on the strain-gauged load axle. An electronic signal is transmitted via an electrical cable to the hoistman’s panel and/or logging computer representing wireline tension. A calibration resistor is included in the load pin to send out a signal to calibrate the computer system.

The measuring wheel is coupled to an optical encoder that transmits electrical signals via an electrical cable to the hoistman’s panel and/or logging computer representing cable depth and speed.

An independently powered encoder and display panel are used for back up depth indication. It uses a magnetic sensor to eliminate the need for a mechanical drive cable and mechanical counter.

A spring mounted tension roller is used to hold the measuring wheel in contact with the wireline to prevent cable slippage under low tension conditions. The two steel guide rollers properly hold the cable in line with the measuring wheel. Two composite guide rollers are provided to keep the wireline in the head under no load conditions.

Wear blocks are used to prohibit cable contact with the frame members. The head is resistant to corrosion by anodized all aluminum parts and using SST or plated steel parts. All the bearings are SST and greaseable to increase their useful life.