EPRO PR6426/010-110+CON021/916-160

Product Overview

PR6426/010-110 + CON021/916-160 is a high-range, non-contact eddy current displacement measurement solution specifically designed for super-large rotating machinery, provided by German Epro.

PR6426/010-110 is an eddy current sensor with a probe diameter of 32mm. The huge probe size enables it to generate a deeper and broader induction field, thus allowing for the measurement of targets at greater distances and being insensitive to minor unevenness on the surface being measured.

CON021/916-160 is a dedicated matching eddy current signal converter that provides high-frequency excitation for PR6426 sensors and linearly converts the impedance changes sensed by the sensors into standard -2V to -18V or -4V to -20V DC voltage signals.

This combination is an ideal choice for monitoring axial displacement and large-amplitude vibration of large water turbines, low-speed heavy-load compressors, rolling mills, ship propulsion shafting systems and other equipment. The core value lies in its ability to provide stable, reliable and high-precision measurements even within a gap of several millimeters or even centimeters, which is beyond the reach of small sensors.

Product specifications and parameters

PR6426/010-110 sensor

PR6426     32mm series

01            Armored cable

0              Standard installation, Mounting Plate 80x40mm

-110         10.0mm linear range

Probe diameter                     32mm

Linear measurement range    10.0mm

Nominal center clearance      approximately 5.5mm

Sensitivity                            2 V/mm ± 1.5% max

Linearity error                      ≤ 2.0%

Minimum shaft diameter        ≥ 200mm

Operating temperature range

Sensor                                   -35°C to +175°C

Maximum cable temperature    200°C

Material                                 Stainless steel for probe housing, PTFE for cable

Weight                                  Approximately 800 grams

CON021/916-160 signal converter

CON021      Basic model

916            Matches PR6426

-160           16.0mm linear range

Supply voltage            -23V to -32V DC

Output signal              -2V to -18V or -4V to -20V.

Frequency response     0 to 20,000 Hz

Rise time                    < 15 µs

Operating temperature range     -30°C to +100°C

Protection grade                       IP20

Certifications                            ATEX, IECEx, CSA

Product Functional Features

The core advantage of this large-scale sensor system lies in its extremely large measurement capability and adaptability to harsh working conditions.

Extra-large measurement range and gap

The linear range of 16.0mm and the nominal installation clearance of 5.5mm enable the PR6426/010-110 + CON021/916-160 to handle extremely large shaft movement. For instance, in large hydroelectric generating units, due to hydraulic shock and thermal expansion, the axial displacement of the shaft may reach several millimeters or even exceed 1 centimeter. Only sensors of the PR6426 level can cover such a wide range.

Not sensitive to surface conditions

The induction field generated by the huge 32mm probe is very deep and smooth. This makes PR6426/010-110 highly immune to local defects on the shaft surface, minor changes in oil film thickness or slight surface roughness. The measurement results reflect the average position of a large area rather than the instantaneous value of a certain point, making the data more stable and reliable.

Designed specifically for heavy machinery

Solid structure. The stainless steel casing and heavy-duty PTFE cables can withstand mechanical stress and high temperatures in heavy industrial environments.

With a wide operating temperature range of -35°C to +175°C, it is suitable for various scenarios from hydropower stations in cold regions to tropical oil refineries.

High dynamic performance

Despite being a large sensor, its frequency response of 20kHz remains excellent. PR6426/010-110+CON021/916-160 can not only precisely measure slowly changing axial displacements but also capture low-frequency, large-amplitude vibrations caused by bearing failures or imbalances.

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