CMT has introduced a new Torque Meter system.
A permanently installed torque measuring device that calculates the actual power output of a ship’s propulsion engine. The measurement results are displayed on the easy to read LCD in “real-time”. A quick comparison of the actual data with a pre-set “propeller curve” provides the operator with a tool that helps avoid overloading of the engine.
The standard signal output is 4-20 mA which allows simple connection of the system to control panels and other devices. An Ethernet connection is also available as an option and alternative digital outputs can be discussed on request.
The CMT Torque Meter operates using a contact free method and without the use of strain gauges. This ensures quick and easy installation and a long product life without requiring regular servicing or engineer visits. The sensors can be located anywhere on the shaft. The optimal position is to place one either side of the bearing housing. The installation uses magnetic tape with double sided backing which again ensures rapid and simple installation. The sensors are then adjusted to pick up the signal from the magnetic tape at a gap of 1-2 mm. The installation can be carried out by crew or shipyard with calibration and zeroing done using the built in software package.
How it works
The torque meter package comprises 2 metal strips (with magnetic pattern), two sensors and a transmitter. The tape provides 150 to 600 pulses per revolution, depending on the diameter of shaft. The sequential magnetic north and south poles of the tape are detected by the sensors. The microprocessor based transmitter detects the shift of pulses of the second tape (the twist of the shaft), caused by the torque and calculates the actual torque reading. The distance of about one meter between both strips and sensors does allow the high accuracy of the system.