Kusam-meco KM 3961 User manual

®
VIBRATION METER
MODEL - KM 3961
OPERATION
MANUAL
G 17,Bharat Industrial Estate, T. J. Road,
Sewree (W), Mumbai - 400 015. INDIA.
Sales Direct : [phone]
Tel. : [phone]. Fax : [phone]
Email : [email protected]
Website : www.kusamelectrical.com
www.kusam-meco.co.in
®

VIBRATION METER
MODEL - KM 3961
1. FEATURE :
In accordance with ISO 2954, used
for periodic measurements, to detect
out-of-balance, misalignment and
other mechanical faults in rotating
machines.
Specially designed for easy on site
vibration measurement of all rotating
machinery for quality control,
commissioning, and predictive
maintenance purposes.
Individual high quality accelerometer for
accurate and repeatable measurements.
Bearing condition monitoring function.
LCD digital display.
Lightweight and easy to use
Wide frequency range (10Hz To 10kHz)
in acceleration mode.
AC output socket for headphones and
recording.
Optional head phones for use as
electronic stethoscope.
Can communicate with PC computer for
statistics and printing by the optional
cable and the software for RS232C
interface.
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KM-3961
VIBRATION TESTER
INCH
FUNC.
METRIC
HOLD
FILTER
VOL.
01

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Display : 4 digits, 18 mm LCD Measured
values and makers (units, 10,
and battery symbol)
Transducer :Piezoelectric accelerometer
Parameters measured :
Velocity, Acceleration, and Displacement
RPM and Frequency
Measuring range :
Velocity : 0.01-400.0 mm/s true RMS
0.000-16.00 inch/s
Acceleration : 0.1-400.0m/s2
equivalent peak 0.3-1312 ft/s2
Displacement : 0.001-4.000mm
0.04-160.0 mil, equivalent pk-pk
RPM (r/min) : 60-99,990 r/min
Readings should be multiplied
by 10 if the display show '10'.
Frequency : 1-20 kHz
Frequency range for measuring
Acceleration : 10Hz to 1kHz In '1' mode
10Hz to 10kHz In '10' mode for
bearing condition check
Velocity : 10Hz to 1kHz
Displacement : 10Hz to 1kHz
Accuracy : ±5%+2 digits
Metric/ Imperial conversion
PC interface : RS232C
2. SPECIFICATIONS : Output : AC output 2.0V peak full scale
(load resistance : above 10k)
Power supply : 4x1.5 AAA size (UM-4)
batteries
Operating conditions :
Temperature : 0-40
Humidity : below 90% RH
Dimensions : 124x62x30mm /
4.9x2.4x1.2 inch
Weight : 120g (not including batteries)
Accessories included :
Powerful rare earth magnet.....1 pc.
Accelerometer..........................1 pc.
Stinger probe (Cone)...............1 pc.
Stinger probe (Ball)..................1 pc.
Carrying case...........................1 pc.
Operation manual....................1 pc.
Optional accessories :
Headphones for use as electronic
stethoscope Cable and software for
RS232C.
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3-1 Accelerometer
3-2 Display
3-3 Input Connector
3-4 Hold key
3-5 Power Key
3-6 Metric / Imperial conversion key
3-7 Function key
3-8 Filter key
3-9 Sound key
3-10 Jack for the headphone
3-11 Jack for RS232C interface
3-12 Battery cover/compartment
3. :FRONT PANEL DESCRIPTIONS
1. Connect the Accelerometer to the
input connector and turn it until the
connector locks in position.
2. Mount the accelerometer at the
measurement point using the powerful
magnet supplied, ensuring that the
mounting surface is clean and flat, or
use direct stud (M5) mounting if this is
available.
3. Depress the power key and release to
power on the meter.
4. Each time the Function key is
depressed and released quickly, the
meter will step to the next vibration
measurement parameter with the
corresponding unit showing on the
display.
5. Each time the Metric / Imperial key is
depressed and released quickly, the
measurement unit will be changed to
the other measurement system.
4. :MEASURING PROCEDURE
®®
KM-3961
VIBRATION TESTER
INCH
FUNC.
METRIC
HOLD
FILTER
VOL.
3-6
3-8
3-9
3-10
3-2
3-7
3-4
3-5
3-12
3-1
MM
DISP
273
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6. When several machinery or bearings
are used under the same operating
conditions, evaluation can be carried
out by listening to the audio signals
to determine changes. This method will
help to locate the defective machinery
or be a ring quickly. Measure all
machines at the same points and
compare the results. The sound volume
can be adjusted by Sound key 3-9.
There are 8 levels from 1 to 8. Every
time depressing and releasing the
sound key quickly, the sound level will
increase 1. The larger the sound level
number, the louder the listening sound.
vibration parameter. It is used for
vibration severity measurements in
accordance with ISO 2372, BS 4675 or
VDI 2056, which are guidelines for
acceptable vibration levels of machinery
in different power categories. These are
presented as a table in section 4 of this
manual. Velocity is typically measured in
cm/s or inch/s RMS (centimeters or
millimeters per second).
Velocity is the most commonly used
This instrument measures in cm/s. If you
are more familiar with measurements in
mm/s, or wish to compare your measured
values directly with the vibration severity
chart in section 4, multiply the displayed
value by 10.
Displacement is typically used on low-
speed machines because of its good low
frequency response, and is relatively
ineffective when monitoring bearings.
Units are typically mil or mm equivalent
peak-peak.
Note :
1. Which parameters should be
measured ?
Acceleration, velocity, & displacement
are the three tried and tested parameters,
which give accurate and repeatable
results. Acceleration is normally
2
measured in m/s peak (meters per
2
second squared) or ft/s , has excellent
high frequency measurement capabilities,
and is therefore very effective for
determining faults in bearings or
gearboxes.
5. :CONSIDERATIONS
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Vibration is a reliable indicator of the
mechanical health or condition of a
particular machine or product. An ideal
machine will have very little or no
vibration indicating that the motor, as well
as peripheral devices such as gearboxes,
fans, compressors, etc., are suitably
balanced, aligned, and well installed. In
practice, a very high percentage of
installations are far from ideal, the results
of misalignment and imbalance exerting
added strain on supporting components
such as bearings. Eventually this lead to
added stress and wear on critical
components, resulting in inefficiency, heat
generation and breakdowns. This often
occurs at the most inconvenient or
uneconomical times, causing costly
production downtime. As parts of
mechanical equipment wear and
deteriorate, the equipment vibration
increases.
2. An Introduction To Vibration
Measurement
Monitoring the vibration of healthy
mechanical equipment on an ongoing
basis, detects any deterioration long
before it becomes a critical problem,
allowing spares to be ordered in advance
and maintenance to be planned only
when necessary. In this way stocks of
expensive and unnecessary spares can
be reduced with obvious financial benefits.
Unscheduled breakdowns result in
production losses and the faulty
equipment is usually repaired hastily to
get production going as quickly as
possible. Under these stressful conditions
staff are not always able to do repairs
correctly regardless of how conscientious
they are, resulting in a high probability of
further early equipment failure.
By implementing a predictive maintenance
program with regular measurements of
critical factors like vibration, downtime
can not only be reduced, but planned
maintenance is more effective, resulting
in improved product quality and greater
productivity.
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A trend is an indication of the way in
which a monitored vibration parameter
behaves over time. If regular vibration
measurements are taken and plotted
over a period of time, the resulting graph
shows the progress or deterioration of a
particular machine.
Typically this will have the general shape
shown in the diagram below, regardless
of the type of machine being considered.
For a short time after installation, whether
it is a new or a repaired machine,
vibration levels may fall slightly as the
machine is run in, followed by a long
period of unchanging levels during the
machine's normal operating lifetime. Then
comes a period of rising levels as
machine parts wear out prior to failure.
Such a trend enables the maintenance
engineer to predict the time of failure and
maximize use of the machine, while
ordering spares and planning its
maintenance for a time convenient to the
production schedule.
3. What is a Trend ?
1. When the battery symbol appears on
the display, it is time to replace the
battery.
2. Slide the Battery Cover ( Fig. 1, 3-12)
away from the instrument and remove
the battery.
3. Install batteries paying careful attention
to polarity.
6. BATTERY REPLACEMENT :
A. Rank of machine vibration (ISO 2372)
7. Appendix : Vibration standards
Vibratio amplitude Machine sort
II III IV I
Vibration velocity V rms (mm/s)
0 ~ 0.28
0.28 ~ 0.45
0.45 ~ 0.71
0.71 ~ 1.12
1.12 ~ 1.8
1.8 ~ 2.8
2.8 ~ 4.5
4.5 ~ 7.1
7.1 ~ 11.2
11.2 ~ 18
18 ~ 28
28 ~ 45
> 45
A
A
A
A
B
B
B
B
C
C
C
C
D
D
D
D
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1. Class I is small motor (power less than
15 kw). Class II is medium motor
(power between 15 ~75kw). Class III is
high power motor (hard base). Class
Ⅳis high power motor (stretch base).
A,B,C,D are vibration Rank. 'A' means
good, 'B' means satisfying, 'C' means
not satisfying, 'D' means forbidden.
Vibration velocity should be taken from
the three perpendicular axes on the
motor shell.
Note :
B. ISO/IS2373 Motor quality standard
according as vibration velocity.
Quality rank Rev (rpm)
Normal (N)
Good (R)
Excellent (S)
600 ~ 3600
600 ~ 1800
1800 ~ 3600
600 ~ 1800
1800 ~ 3600
H : high of shaft (mm)
Maximum vibration velocity (rms)
(mm/s)
80<H<132 132<H<225 225<H<400
1.8
0.71
1.12
0.45
0.71
2.8
1.12
1.8
0.71
1.12
4.5
1.8
2.8
1.12
1.8
Limit of rank 'N' is suitable for common
motor. When the request is higher than
that in the table, limit can be gotten by
dividing the limit of rank 'S' with 1.6 or
multiples of 1.6.
C. Maximum vibration of motor that power
larger than 1 horsepower (NEMA
MG1-12.05).
Rev (rpm) Displacement (P - P) (um)
3000 ~ 4000
1500 ~ 2999
1000 ~ 1499
999
<
25.4
38.1
50.8
63.6
*For AC motor, rev is maximum
synchronous rev. For DC motor, it is
maximum power rev. For motor in series,
it is work rev.
D. Maximum vibration of high power
induction drive motor (NEMA MG
1-20.52).
Rev (rpm) Displacement (P - P) (um)
3000
1500 ~ 2999
1000 ~ 1499
999
25.4
50.8
63.6
76.2
<
>
National Electric Manufacturers Association
(NEMA)
Establishes two standards above.
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WARRANTY
Each “KUSAM-MECO” product is warranted to be free from
defects in material and workmanship under normal use &
service. The warranty period is one year (12 months) and
begins from the date of despatch of goods. In case any
defect occurs in functioning of the instrument, under proper
use, within the warranty period, the same will be rectified by
us free of charges, provided the to and fro freight charges are
borne by you.
This warranty extends only to the original buyer or end-user
customer of a “KUSAM-MECO” authorized dealer.
This warranty does not apply for damaged Ic’s, fuses, burnt
PCB's, disposable batteries, carrying case, test leads, or to
any product which in “KUSAM-MECO’s” opinion, has been
misused, altered, neglected, contaminated or damaged by
accident or abnormal conditions of operation or handling.
“KUSAM-MECO” authorized dealer shall extend this
warranty on new and unused products to end-user
customers only but have no authority to extend a greater or
different warranty on behalf of “KUSAM-MECO”.
“KUSAM-MECO’s” warranty obligation is limited, at option,
free of charge repair, or replacement of a defective product
which is returned to a “KUSAM-MECO” authorized service
center within the warranty period.
THIS WARRANTY IS BUYER’S SOLE AND EXCLUSIVE
REMEDY AND IS IN LIEU OF ALL OTHER WARRANTIES,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
TO ANY IMPLIED WARRANTY OF MERCHANTABILITY
OR FITNESS FOR A PARTICULAR PURPOSE. “KUSAM-
MECO” SHALL NOT BE LIABLE FOR ANY SPECIAL,
IND IRE CT, INCIDENTAL OR CON SEQ UEN TIA L
DAMAGES OR LOSSES, INCLUDING LOSS OF DATA,
ARISING FROM ANY CAUSE WHATSOEVER.
All transaction are subject to Mumbai Jurisdiction.
MUMBAI
TEST CERTIFICATE
VIBRATION METER
This Test Certificate warrantees that the
product has been inspected and tested in
accordance with the published specifications.
The instrument has been calibrated by using
equipment which has already been calibrated
to standards traceable to national standards.
MODEL NO. ____________
SERIAL NO. ___________
DATE: ___________
ISO 9001
REGISTERED
QC
PASS
KUSAM-MECO
KM 3961
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