Specifications

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SHARK MANUAL Rev H Page 6 of 34 Aug 2009
2.3 TENSION SPECIFICATIONS:
The wheel nearest the well rotates on an axle pin that is instrumented with strain
gauges. These strain gauges produce an electrical signal proportional to the
magnitude of line tension. The wire always makes a complete 180 degree wrap
around the tension wheel so rigup angle does not affect the tension measurement.
The tension wheel is mounted on a self aligning bearing which allows the wheel to
properly align itself. This reduces any side forces that may be present which
increases the tension measurement accuracy.
There are three tension interfaces available:
PASSIVE BRIDGE:
Power Requirements: 12 excitation voltage
Interface: None – passive bridge only
DIFFERENTENTIAL VOLTAGE:
Power Requirements: +/– 15 vdc input power
Interface: Proprietary circuit board which
amplifies the load pin signals and
provides a 1.5v differential output.
0 vdc = 0 lbs (0 kg)
1.2 vdc = 4000 lbs (1814 kg) - shunt cal
1.5 vdc = 5000 lbs (2268 kg)