Monarch Instrument EXAMINER 1000 User Manual

Page 10

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Selecting Measurements

Establish measurement types that most accurately reflect the condition of the
equipment. Different causes or “mechanisms” are acting on the machine; various
types of measurements have been developed to measure each type of mechanism.
Those mechanisms are:
Stress

A force on the machine or components which deflects the part. Best
measured in Displacement. The Examiner 1000 does not measure
Displacement as it is a very low vibration frequency, below 10 Hz (600
RPM).

Fatigue Repeated cycles of stress on a component. If you bend a part back and

forth enough times it will fatigue. As a general rule, fatigue failures result
from vibration frequencies 10 -2000 Hz and Velocity measurements are
used. Velocity will be the primary measurement taken.

Force

Mass x acceleration. Measured in Acceleration. Acceleration is the
rate of change of velocity. Acceleration is used for high frequencies above
2000 Hz (120,000 RPM). Bearing defects and gearmesh frequencies
are usually found in this range.

Impact forces The result of fatigue. Impact forces are cyclical events which can

be detected with Acceleration Enveloping. These are high
frequency-low amplitude events and a filter in the EXAMINER
1000 is set at 10-30 kHz to measure them.

Types of Measurements in the EXAMINER 1000

Velocity- Good for frequency ranges 10-2000 Hz (600-120,000 RPM).
Acceleration-used for higher frequencies or speeds above 2000 Hz (120,000 CPM).
Acceleration Enveloping-uses a high pass filter to measure high-frequency,
repetitive bearing and gearmesh vibration signals. Used for early detection of
developing bearing or lubrication problems. Use this type in combination with the
other types to detect changes in machinery.

Select Measurement Intervals

Based on the classification of the machine, its repair history and the amount of data
required for a detailed trend analysis. At the beginning of a Predictive Maintenance
Program, collect data frequently to build a rapid history of each machine. Adjust
your program as you go. If measurement results are indicating signs of change,
measurements should be performed more frequently.

Getting Started in Your Plant

Planning your work is very important to achieve success. The EXAMINER 1000
is an overall vibration meter and electronic stethoscope. It can be used as a stand
alone device for the collection of vibration data for the purposes of trending or as a
diagnostic instrument used to troubleshoot machinery defects. In order to setup a
trending program you must collect data on the same point with the same measurement
type at a defined interval. The Machinery Data Worksheet allows for record keeping
of collected data. The EXAMINER may be used with the On-Time software to
store data and perform trend analysis. REPEATABILITY IS REQUIRED FOR
ACCURATE TRENDING.

Establish a standard naming convention so you can communicate your results to the
rest of maintenance. Vibration readings

are taken on the bearing caps or as close to

the bearings as possible. Always collect data the same way, at the same point on the
machine each time.

Horizontal

Axial

Direction for placing the Sensor

For Vertical and Horizontal readings,
the sensor is placed in a radial position.

Also establish a starting point for each machine. Begin from the OUTBOARD
END of the DRIVE UNIT, calling this point A. Proceed to label Points (bearings)
as needed until you have reached the outboard end of the driven unit.

POINT
A

1234567

12345

MOTOR

PUMP

Vertical

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