VMI Viber X Series User manual

VIBER X1™ Manual

Ver. 1.0

VIBER X

™

Our X series of hand-held instrument

VIBER X1 VIBER X2 VIBER X3

VIBER X5

Our X series of hand-held instruments

Our X series of hand-held instrument

VIBER X1 VIBER X2 VIBER X3

VIBER X5

Important information

Safety precautions

Vibration measurement and balancing involves measurement on rotating machines.

Keep a safe distance to rotating parts and secure transducers and transducer cables

from rotating parts. Always follow internal, local and national security

regulations! When working with weights on the rotor always secure the start

switch with a locker and also use the emergency switch for double safety. This is

especially important when the machine is remote controlled.

VMI International AB takes no responsibility for any accidents on people and

machines.

VMI International AB and our authorized dealers will take no

responsibility for damages on machines and plants as the result

of the use of VIBER X1™ measurements.

Even though great efforts are made to make the information in

this manual free from errors and to make the information

complete for the user, there could be items we have missed,

because of the large amount of information. As a result of this,

we might change and correct these items in later issues without

further notice. Also changes in the VIBER X1™ equipment may

take place that affect the accuracy of the information.

VIBER X1 VIBER X2 VIBER X3

VIBER X5 MKIII

Important information

Safety precautions

Vibration measurement and balancing involves measurement on rotating machines.

Keep a safe distance to rotating parts and secure transducers and transducer cables

from rotating parts. Always follow internal, local and national security

regulations! When working with weights on the rotor always secure the start

switch with a locker and also use the emergency switch for double safety. This is

especially important when the machine is remote controlled.

VMI International AB takes no responsibility for any accidents on people and

machines.

VMI International AB and our authorized dealers will take no

responsibility for damages on machines and plants as the result

of the use of VIBER X1™ measurements.

Even though great efforts are made to make the information in

this manual free from errors and to make the information

complete for the user, there could be items we have missed,

because of the large amount of information. As a result of this,

we might change and correct these items in later issues without

further notice. Also changes in the VIBER X1™ equipment may

take place that affect the accuracy of the information.

Important information

Safety precautions

Vibration measurement and balancing involves measurement on rotating

machines. Keep a safe distance from rotating parts. Secure transducers

and cables from rotating parts. Always follow company, local and national

security regulations!

VMI International AB and our authorized dealers will take no

responsibility for either damages on machines and plants or accidents on

people as the result of the use of VIBER X

™measurements.

Even though great efforts are made to make the information in

this manual free from errors and to make the information complete for the

user, there could be items we have missed, because of the large amount of

information. As a result of this, we might change and correct these items

in later issues without further notice. Also changes in the VIBER X™

equipment may take place that affect the accuracy of this information.

Instrument overview

The VIBER X1™ is a portable Vibrometer to be used in preven-

tive and active maintenance work, especially on rotating machin-

ery.

A complete set consist of an instrument, carrying bag, a vibration

transducer with magnet support and charger.

VIBER X1™ is measuring the effective velocity (mm/s RMS)

in the frequency range 2 – maximum frequence. The range can be

set by adjustable ﬁlters, high pass ﬁlters can be set 2 Hz or 10 Hz,

low pass ﬁlters can be set at 1 000 Hz or maximum frequency.

This range covers most of the frequencies that will occur for the

majority of mechanical failures and imperfections. Examples are

unbalance, looseness, resonance, misalignment of shafts and gears,

cavitations and other ﬂuid generated vibrations.

The judgements of the measured levels are supported by several

vibration standards. The close comparison between vibration

levels and actual wear of the machinery will build up local

knowledge. This experience should be used to optimise the type of

action required when higher vibrations are found.

A common standard for judgement of vibrations is ISO 10816-3

and may be available from domestic standardisation authority.

This standard is an upgrade of older standards that has been in use

for several decades and has a worldwide acceptance as a

good judgement for continuous and long lasting operation of

machinery.

Instrument overview

The VIBER X

™is a portable vibrometer to be used in

preventive and pro-active maintenance work, especially on

rotating machinery. A complete set consists of an instrument,

soft carrying bag, a vibration transducer with magnet support.

VIBER X™ measures the velocity (mm/s RMS) in the two

frequency ranges 10 - 1000 Hz or 2 Hz – maximum frequency

(16000 Hz depending on version of VIBER X™ and trans-

ducer). The instrument has the capability to measure up to 40

kHz, the limiting factor is the accelerometer.

This range covers most of the frequencies that will occur for

the majority of mechanical failures and defects. Examples

are unbalance, looseness, resonance, misalignment of shafts,

vibrations.

VIBER X™ 10 - 1000 Hz is designed for companies that

uses the recommendation ISO 10816-3. This standard, is used

for decades around the world.

The vibration alerts are supported by several vibration stan-

dards. The close comparison between vibration levels and

actual machinery wear will build up your knowledge. Use

this experience to determine the action required when high

vibrations are found.

Vibraon Measurement Instruments

Functions

Press the start key and the instrument starts to measure

vibration, default is 2 – maximum frequency range, the diodes

indicates low and high pass ﬁ lters setting.

The instrument will be shut off automatically after approximately

4 minutes if no key are used during the time.

This button can be used if the digits need a higher brightness to be

more visible.

The Viber X1™ is one of few analogical instrument that has

adjustable frequency ranges. To measure in other frequency

range, use the up/down arrows to change the ﬁ lters. The ﬁ lters

LED will light up to show the ﬁ lter in use. This can be a useful

feature; comparison can be done with measurements in the

same range. Notice that the old ISO standard had 10 -1000 Hz

as frequency range. We recommend you to use 2 – 1000 Hz

as a standard range.

Start of the instrument

Improving the light

Changing frequency range

Manual Viber X1_121002.indd 5 10/3/12 9:26 AM

Power on the instrument

Press the On/Off key and the instrument starts to measure

vibration, default is 10 - 1000 Hz or 2 Hz – maximum

frequency range depending on version. The instrument shuts

off automatically after approximately 4 minutes if no key is

pressed.

Vibraon Measurement Instruments

Battery check

VIBER X1™ has an embedded battery check, when less than 10 %

of the battery capacity remains, the battery LED will ﬂ ash.

Press this symbol key and the measurement of bearing condition

will start. The instrument measures instantaneously a bearing

condition value in the range between 500 Hz to 20.000 Hz.

To go back to vibration measurements, press the symbol once

more.

Placing of the measuring point

The measurements should be taken on or as close to the bearing as

possible and in horizontal, vertical and axial directions.

Bearing condition

Manual Viber X1_121002.indd 6 10/3/12 9:26 AM

Start measuring vibration on the machine then, press the

symbol key for bearing condition measurement. The instru-

ment measures instantaneously a Bearing Condition value in

the range between 500 Hz to 16 000 Hz. To return to vibration

measurement, press the symbol again.

Vibraon Measurement Instruments

Functions

Press the start key and the instrument starts to measure

vibration, default is 2 – maximum frequency range, the diodes

indicates low and high pass ﬁ lters setting.

The instrument will be shut off automatically after approximately

4 minutes if no key are used during the time.

This button can be used if the digits need a higher brightness to be

more visible.

The Viber X1™ is one of few analogical instrument that has

adjustable frequency ranges. To measure in other frequency

range, use the up/down arrows to change the ﬁ lters. The ﬁ lters

LED will light up to show the ﬁ lter in use. This can be a useful

feature; comparison can be done with measurements in the

same range. Notice that the old ISO standard had 10 -1000 Hz

as frequency range. We recommend you to use 2 – 1000 Hz

as a standard range.

Start of the instrument

Improving the light

Changing frequency range

Manual Viber X1_121002.indd 5 10/3/12 9:26 AM

Vibraon Measurement Instruments

Battery check

VIBER X1™ has an embedded battery check, when less than 10 %

of the battery capacity remains, the battery LED will ﬂ ash.

Press this symbol key and the measurement of bearing condition

will start. The instrument measures instantaneously a bearing

condition value in the range between 500 Hz to 20.000 Hz.

To go back to vibration measurements, press the symbol once

more.

Placing of the measuring point

The measurements should be taken on or as close to the bearing as

possible and in horizontal, vertical and axial directions.

Bearing condition

Manual Viber X1_121002.indd 6 10/3/12 9:26 AM

Measuring point location

Measurements should be taken on the bearing housing or as

close as possible and in the horizontal, vertical and axial direc-

tions. This is also explained in the standard ISO-10816.

V V

Vibraon Measurement Instruments

Functions

Press the start key and the instrument starts to measure

vibration, default is 2 – maximum frequency range, the diodes

indicates low and high pass ﬁ lters setting.

The instrument will be shut off automatically after approximately

4 minutes if no key are used during the time.

This button can be used if the digits need a higher brightness to be

more visible.

The Viber X1™ is one of few analogical instrument that has

adjustable frequency ranges. To measure in other frequency

range, use the up/down arrows to change the ﬁ lters. The ﬁ lters

LED will light up to show the ﬁ lter in use. This can be a useful

feature; comparison can be done with measurements in the

same range. Notice that the old ISO standard had 10 -1000 Hz

as frequency range. We recommend you to use 2 – 1000 Hz

as a standard range.

Start of the instrument

Improving the light

Changing frequency range

Manual Viber X1_121002.indd 5 10/3/12 9:26 AM

Vibraon Measurement Instruments

How to make good measurements

The sensitivity direction of the transducer coincides with the

centre axis of the transducer. The transducer end (with the

magnetic support) is pushed ﬁ rmly against the measurement

point. The main purpose is to make the complete transducer to

fully participate in the motion of the measurement point. Try to

hold the transducer in a vertical, horizontal or axial direction as

possible, even if the machine surface does not have these

directions. Read the instrument held with the free hand. Note a

stable reading as well as a ﬂ uctuating one, since the ﬂ uctuation

itself is valuable information regarding the reason for the

vibration.

When the transducer is mounted with the magnet the frequency

range of the measurement is reduced to about 2 000 - 3 000Hz

depending on the ﬂ atness of the measuring surface.

Note!

When using the magnet the bearing condition value can be

substantially changed.

Vibrations at high frequencies can sometimes cause measurement

lack of conﬁ dence. Pressing the transducer more ﬁ rmly should

not change the reading. If in doubt, always try to adjust the

contact point ﬁ rst. Secondly, if necessary, mount the transducer

with the M6 stud.

All normal measurements on vertical or horizontal machinery

should follow the three perpendicular axes of true vertical,

Manual Viber X1_121002.indd 7 10/3/12 9:26 AM

How to make good measurements

The sensitivity direction of the transducer coincides with the

center axis of the transducer. Place the accelerometer on the

measurement point. Wait a few seconds for the accelerometer

to come to a steady state to reduce noise from the accelero-

meter. If you are connecting to a non-magnetic surface, push

rmly against the measurement point. Make sure it is a proper

contact with the machine. If measurement are taken on a

curved surface, make sure the accelerometer is attached and

not moving back and forth. Measure a vertical, horizontal and

axial direction, if possible. Note if the reading is stable or uc-

tuating. The non-stable reading is also valuable information

used to determine the vibration cause.

When the transducer is mounted with the magnet, the reliable

frequency range of the measurement is reduced to about 2000

– 3000 Hz depending on the atness of the contact between

magnet and surface.

Note!

Using the magnet can change the bearing condition value.

High frequency vibration can sometimes be difcult to collect

because high vibration does not transmit through the machine

for long distances. Pressing the transducer more rmly should

not change the reading. If in doubt, always try to adjust the

contact point rst. Secondly, if necessary, mount the transdu-

cer with the M6 stud.

horizontal and axial directions. The reason is that you should keep

to the main stiffness directions caused by normal non symmetrical

properties of the foundation, piping, supports etc. It will result in

better understanding if the basic measurements are made in this

way.

The VIBER X1™ is mainly intended for measurements against

the housing and bearings of machinery according to the intentions

of the standards. You can also use it to measure other parts such

as piping, valves, etc. Note that in some cases the mass of the

transducer may inﬂuence the reading. A good rule is to consider

readings on surfaces that are lower in mass than 10 times the mass

of the transducer.

All normal measurements on vertical or horizontal machinery

should follow the three perpendicular axes of true vertical,

horizontal and axial directions.

The VIBER X

™is mainly intended for measurements

against the machinery housing and bearings. And designed for

fans, pumps, chemical motors and compressors.

VIBER X

™can also be used to measure other components

such as piping, valves, etc.

Note

the reading. A good rule is to avoid readings on things that

have only 2-3 times the mass of the transducer.

How to interpret vibration measurements

A user with no previous experience to interpret the results is

recommended to use the ISO 10816-3 standard.

The standard normally calls for a measure in velocity based on

mm/s RMS. To better understand what this measure means it can

be helpful to consider the reading as a mean value of the back and

forward motion. This measure gives a good understanding of the

amount of “break down energy”, causing mainly wear and fatigue

work, in the machine or the structure being measured.

The instrument is measuring the total RMS-value of the vibration

in actual frequency range. This RMS-value is an average sum of

all the measured vibrations.

Example:

If the simultaneous vibration caused by unbalance is (4mm/s), by

misalignment (2 mm/s) and by the gear mesh (5 mm/s) then the

total vibration measured with VIBER X1™ is 6.7 mm/s.

Total vibration =

Notice that a reduction of the unbalance from 4 mm/s to 1 mm/s

will reduce the total value from 6, 7 mm/s to 5, 5 mm/s.

√4 * 4 + 2 * 2 + 5 * 5 = 6.7mm

How to interpret vibration measurements

A user with no previous experience, we recommend to use the

ISO 10816-3 standard.

The standard normally calls for a velocity measurement in

mm/s RMS. To better understand what this measurement

means, think of it as how fast the machine is

moving back and forth. This measure gives a good understan-

ding of the amount of “break down energy”, causing mainly

wear and fatigue in the machine or the structure.

The instrument measures the total RMS vibration value in the

frequency range. This RMS value is the average sum of all the

measured vibrations.

Example:

If the simultaneous vibration caused by unbalance is (4mm/s),

by misalignment (2 mm/s) and by the gear mesh (5 mm/s)

then the total vibration measured with VIBER X™ is 6.7

mm/s.

Total vibration = √4 * 4 + 2 * 2 + 5 * 5 = 6.7mm

Notice that a reduction of the unbalance from 4 mm/s to 1

mm/s will reduce the total value from 6, 7 mm/s to 5, 5 mm/s.

Vibraon Measurement Instruments

The ISO standard is classifying the machines differently if the

machines are considered as ﬂ exible or rigid mounted. This reﬂ ects

the location of the machines stiff-body resonance’s related to the

basic running speed of the machine.

For instance, a machine supported by rubber or springs have

resonance’s at low running speeds. The machine starts vibrate

at certain low rpm. When the speed is increased above these

resonance frequencies the vibration is reduced. This machine is

considered ﬂ exible.

A resonance can easily be found when a ﬂ exible machine is

running up or down in speed. The resonances are located at

the rpm´s where the vibration has a local maximum level.

Manual Viber X1_121002.indd 10 10/3/12 9:26 AM

The ISO standard classies the machines differently if the machi-

nes are exible or rigid. This reects the location of the machine’s

stiff-body resonance related to the basic running speed of the

machine.

For example, a machine supported by rubber or springs have a

resonance at low running speeds. The machine starts vibrate at

a low RPM. When the speed is increased above these resonance

frequencies, the vibration is reduced. This machine is considered

exible.

Resonance is easily found when a exible machine is running up

or down in speed. The resonances are located at the speed where

the vibration has a local maximum level.

Rigid

1.4

mm/s

2.8

4.5

Group 2 and 1 Group 4 and 3

Rigid Flex. Flex. mm/

2.3

3.5

7.1

Extraction’s from ISO 10816-3

Industrial machines with power above 15kW and nominal

speeds between 120 - 15000 RPM.

Group 1:

Large machines with rated power

above 300kW. Electrical machines

with shaft height H > 315mm.

Operating speed ranges from 120 to

15000 RPM.

Group 2:

Medium-sized machines with a rated power above 15kW up to and

including 300kW. Electrical machines with shaft height between

160 < H < 315 mm. Operating speed normally above 600 RPM.

This manual suits for next models

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