Vibration Transmitters

Vibration transmitters provide electrical outputs that are proportional to vibration inputs. They are used during predictive maintenance in order to reduce unexpected machine failure. Vibration transmitters collect vibration information from a machine and evaluate the data so that maintenance can be performed based on trends in the machinery’s condition. Vibration transmitters can provide a 4-20mA signal that is directly proportional to the overall vibration level of the machine. Vibration transmitters use root mean square (RMS) vibration measurements for accuracy.

Vibration transmitters are used to sense machine imbalances, shaft misalignment, and mechanical looseness in machinery. Shaft misalignment occurs when rotating machinery shafts become misaligned due to movement that results from the operation of the machine at less than optimal conditions. When shafts become misaligned, forces on the machine produce stress on various components. In order to achieve proper shaft alignment, the rotational centers of two or more shafts must be positioned so that they are co-linear during normal machine operation.

There are many different types of vibration transmitters. A motor vibration transmitter is a type of vibration transmitter that is used to convert the rotation of a motor into vibration. Motor vibration transmitters typically consist of a vibrating motor and a capsule on the outside. An electronic circuit drives the motor and the capsule converts the rotation of the motor into vibration, while ensuring that the person using the device does not come in contact with the rotating motor. These types of devices are commonly used in cell phones and pagers. A loop-powered sensor is a type of vibration transmitter that has power and extracts measurement signals along the same set of power wires to remote locations over long distances. The loop operation converts the sensor output voltage to a proportional current, and then a receiver at the remote location converts the current back into a voltage. Typical loop-powered sensors provide currents at 4-20 mA output, which is 4mA for sensor zero-level output, and 20mA for sensor full-scale output. As long as the transmitter and loop supply can compensate for voltage losses (loop drops) caused by sending currents over long distances, the reduction of the current can be avoided.

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