Address:East Room 306,3th Floor,1st Building,Shenhua Industrial Park,Meihua Road, Futian District,Shenzhen City
Tel:0755-32978297
Email:[email protected]
1. Purpose
The PCE-VM 25 has been developed, particularly, for the measurement and monitoring of vibrations on rotating machines. The purpose of such measurements is to
monitor the condition of the machine in order to avoid unscheduled shut-down. Furthermore vibration measurement is carried out prior to the distribution of new
machinery and subsequently to repair with a view to quality control and the issuing of product guarantees.
The basis for successful machine condition monitoring is the measurement of the vibration severity over a longer period of time. Measurements are taken at regular
intervals of time and recorded.
The PCE-VM 25 measures and records vibration acceleration, vibration velocity or vibration displacement. The
PCE-VM 25 specification complies with the ISO 2954 regulations for machines that measure vibration velocity and is therefore suitable for measuring, among other
things, machine vibrations in accordance with ISO 10816.
In addition to vibration quantities the PCE-VM 25 also measures the temperature and the rotation speed with contactless sensors.
An external piezoelectric accelerometer is used as the sensor, and is provided together with the instrument.
The PCE-VM 25 is fitted with an electronic measurement point detector (VMID) which enables it to take routine measurements of a large number of measurement
points very effectively. A software package for transferring the measurement data to a PC is also available from PCE.
In the common hierarchy of condition monitoring the PCE-VM 25 is equivalent to ‚Level 1‘. This represents the long term monitoring of parameters with low technical
and personnel requirements.
For fault detection (‚Level 2‘), as a further step, spectral diagnostic measurements are taken, which require a large degree of expertise and sophisticated measurement
technology.
In the development of the PCE-VM 25 value was placed on simple operation and maintenance requirements, which enable trained personnel to operate the instrument
without the need of being specially qualified.
2. Function
2.1. The Vibration Sensor
The PCE-VM 25 operates with a piezo ceramic shear accelerometer. Piezoelectric vibration transducers are characterized by high precision and resolution with great robustness.
The accelerometer of the PCE-VM 25 has an integrated electronic circuit for impedance conversion in accordance with the IEPE standard. At the base of the sensor a magnet has
been integrated for mounting to the measurement point. In the center of the magnet there is a contact point from which the identification number can be read. The measurement
point ID is saved in the available
VMID measurement points.
The coupling surface is protected by a metal cap which attaches to the sensors magnetic base.
2.2. The Measuring Instrument
Figure 2: Block Diagram
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