3300/90 BENTLY NEVADA  Output Module

The probes come with the serial number and part number printed on a label. The label is protected by a piece of clear FEP tubing. During installation, user identification can be placed under another piece of shrinkable FEP tubing. The tubing is shrunk when heat is applied.The probe signal and the input power are transmitted between the Proximitor and a standard Bently Nevada monitor through a 3-wire shielded signal cable (provided by the user in most cases). The Proximitor can be up to 1000 feet (305 metres) from a monitor without degradation of performance. Probes are compatible with most petrochemical environments. Strong acids with a pH of less than 4, strong bases with a pH greater than 10, and some organic solvents may damage the probes. Contact the nearest Bently Nevada Corporation office for details about probes that operate in harsh environments. Standard versions of the components of this system are shown in Appendix A. Specifications are listed in Appendix B, and Appendix C shows scale factors and sensitivity curves.

The probe radiates radio frequency energy from the probe tip coil. As a conductive material (such as a machine shaft) approaches the probe tip, eddy currents are induced into that material. The closer the conductive material comes to the probe tip, the greater the magnitude of the eddy currents. As the eddy currents increase, the power energy radiated from the probe tip is absorbed and there is a corresponding loss in power detected at the Proximitor. If the probe-to-shaft gap remains constant, the Proximitor output signal remains constant; if the gap changes, the output signal changes accordingly. The 14 Millimetre Proximity Transducer System is primarily intended for measuring the axial thrust motion of large machine rotors. Its relatively large linear measuring range may be required for thrust position measurements on large machines. Probes mounted to measure thrust position should be located within 12 inches of the thrust collar. Thrust position probes mounted at the machine end opposite the thrust collar do not provide adequate protection since they also measure differential expansion. Typically, two probes are used so that if one is damaged or fails, thrust position can continue being monitored. See Figure 1-2.

The structure and details of the product：

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