EMERSON PR6425/010-130+CON021 Bearing Vibration Sensor

Description

The PR 6425 is a non-contact eddy current transducer with a rugged construction and is designed for extremely critical turbomachinery applications such as steam, gas, compressor and hydro turbomachinery, blowers and fans. The purpose of a displacement probe is to measure position or shaft movement without contacting the measured surface – the rotor. In the case of sleeve bearing machines, the shaft is separated from the bearing material by a thin film of oil.

The oil acts as a dampener and therefore the vibration and position of the shaft are not transmitted through the bearing to the bearing case. The use of case vibration sensors is discouraged for monitoring sleeve bearing machines since the vibration produced by shaft motion or position is greatly attenuated through the bearing oil film.

The ideal method of monitoring shaft position and motion is by mounting a non-contact eddy sensor through the bearing, or inside the bearing, measuring the shaft motion and position directly. The PR 6425 is commonly used to measure vibration of machine shafts, eccentricity, thrust (axial displacement), differential expansion, valve position, and air gaps.

n Non-contact measurement of static and dynamic shaft displacement – Axial and radial shaft displacement (position) – Shaft eccentricity – Shaft vibration (motion)

n High temperature applications, continuous operation up to 380˚ C (716˚ F)

n Meets international standards, DIN 45670, ISO 10817-1 and API 670

n Rated for explosive area, Eex ib IIC T6/T4

n Other displacement sensor selections include PR 6422, 6423, 6424 and 6425

n Select sensor driver such as CON 011/91, 021/91, 041/91, and cable for complete tranducer system

Target

Electrically conducting steel Cylindrical shaft n On measuring collars, if target surface is less than 40 mm (1.57 in) diameter, then error may be 1% or greater. n Error negligible when target surface is greater than 40 mm (1.57 in) in diameter. Peripheral speed of shaft: 0 to 2500 m/s Shaft diameter > 80 mm (3.15 in) Nominal gap (center of measuring range): 3.0 mm (.12 in)

Measuring error after calibration

< ±2% linearity error with transducer signal converter CON 0x1/915-040

Connection of transducer to converters

CON 011/CON 915-040 and CON021/915-040, Lemo plug
CON 041/915040, blunt cut cable for screw terminals