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Acceleration/Velocity/Displacement
VIBRATION METER
Model : VB-8220
Your purchase of this VIBRATION METER marks a step
forward for you into the field of precision measurement.
Although this METER is a complex and delicate instrument,
its durable structure developed. Please read the following
instructions carefully and always keep this manual within easy
reach.
PLEASE READ THIS MANUAL CAREFULLY BEFORE OPERATION
Hagavish st. Israel 58817 Tel: 972 3 5595252, Fax: 972 3 5594529
OPERATION MANUAL
MRC.4.25
mrc@mrclab.com
,3
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Summary of Contents for MRC VB-8220
- Page 1 Acceleration/Velocity/Displacement VIBRATION METER Model : VB-8220 Your purchase of this VIBRATION METER marks a step forward for you into the field of precision measurement. Although this METER is a complex and delicate instrument, its durable structure developed. Please read the following instructions carefully and always keep this manual within easy reach.
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Page 2: Table Of Contents
TABLE OF CONTENTS 1 FEATURES..............1 2 SPECIFICATIONS............2 3 FRONT PANEL DESCRIPTION........4 3-1 Display.............. 4 3-2 Input socket of meter.........4 3-3 RS-232 output terminal........4 3-4 RMS/PEAK switch..........4 3-5 Acceleration/Velocity/Displacement switch....4 3-6 Data hold button..........4 3-7 Power button............. 4 3-8 RECORD button..........4 3-9 RECALL button...........4 3-10 Battery compartment/cover........4 3-11 Cable plug............4... -
Page 3: Features
1. FEATURES * Applications for industrial vibration monitoring : All industrial machinery vibrates. The level of vibration is a useful guide to machine condition. Poor balance, misalignment & looseness of the structure will cause the vibration level increase, it is a sure sign that the maintenance is needed. -
Page 4: Specifications
2. SPECIFICATIONS Display 61 mm x 34 mm supper large LCD display. 15 mm ( 0.6" ) digit size. Measurement Velocity, Acceleration, Displacement, RMS value, Peak value, Data hold, Max. & Min. value. Velocity : Range 200 mm/s : 0.5 to 199.9 mm/s Acceleration : 200 m/s^2 : 0.5 to 199.9 m/s^2 Displacement ( p-p ) :... - Page 5 Sampling time Approx. 1 second. Data output RS 232 serial output. Operating 0 to 50 ( 32 to 122 ℃ ℉ temperature Operating Less than 80% RH. humidity Power supply Alkaline or heavy duty type, DC 9V battery, 006P, MN1604 (PP3) or equivalent. Power Approx.
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Page 6: Front Panel Description
3. FRONT PANEL DESCRIPTION Fig. 1 3-1 Display 3-2 Input socket of meter 3-3 RS-232 output terminal 3-4 RMS/PEAK switch 3-5 Acceleration/Velocity/Displacement switch 3-6 Data hold button 3-7 Power button 3-8 RECORD button 3-9 RECALL button 3-10 Battery compartment/cover 3-11 Cable plug 3-12 Vibration sensor 3-13 Magnetic base... -
Page 7: Measuring Procedure
4. MEASURING PROCEDURE 1)Plug in the " Cable plug " ( 3-11, Fig. 1 ) to the " Input socket of meter " ( 3-2, Fig. 1 ). 2)a. For the Acceleration measurement, select the " ACC./VEL./DSP(P-P) switch " ( 3-5, Fig. 1 ) to the "... - Page 8 5)If the surface material of measuring article is not the ferrous material, hold the vibration sensor by hand & touch the sensor to the surface of the measuring article, refer the Fig. 2. Fig. 2 6)If the surface material of measuring article is the ferrous material, connect "...
- Page 9 Fig. 4 7)PEAK value measurement Before the measurement if select the " RMS/PEAK switch " ( 3-4, Fig. 1 ) to the " PEAK " position. The Acceleration and the Velocity measurement, the display will display the peak value. However the Displacement measurement will display the Peak to Peak value no matter the "...
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Page 10: Zero Adjustment Procedure
9) Data Record ( Max., Min. reading ) * The DATA RECORD function displays the maximum, minimum and average readings. To start the DATA RECORD function, press the " RECORD Button " ( 3-8, Fig. 1 ) once. " REC " symbol will appear on the LCD display. - Page 11 1)Select the " Acceleration/Velocity Switch " to the " Acceleration " position. 2)No signal into the vibration sensor. 3)Open the battery cover. 4)Use a convenient screw driver to adjust " Zero adjust VR " until the display reach the zero value.
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Page 12: Power Management
6. POWER MANAGEMENT The meter is built the " Auto power shut off " to saves battery life. If not any function button be pushed within approx. 10 minutes, the power will be off automatically. If the user intend to disable the " Auto Power off " function, it should take the following procedures : During the measurement, push the "... - Page 13 The 16 digit data stream will be displayed in the following format : D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Each digit indicate the following status : End Word D1 to D4 Upper Display reading, D1=LSD, D4=MSD D5 to D8 D5 = ?
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Page 14: Battery Replacement
8. BATTERY REPLACEMENT 1)When the left corner of LCD display show " LBT ", it is necessary to replace the battery. However, in-spec measurement may still be made for several hours after low battery indicator appears before the instrument become inaccurate. 2)Use the coining or "... -
Page 15: Classification Ranges
10. CLASSIFICATION RANGES For the valuation of machines and equipment in the ISO 2372 and VDI 2056, four different kinds of machine groups with four classification ranges and their limits for vibration severity ( mm/s ) are determined. The classifications for each machine group are specified as follows : Small machines, especially production electrical motors of up to 15 KW ( Group K ) -
Page 16: Sensitivity Relative Table According Iso 2954
Large machines on heavy foundations ( Group G ) Good 0 to 1.80 mm/s Acceptable 1.81 to 4.50 mm/s Still permissible 4.51 to 11.2 mm/s Dangerous > 11.2 mm/s Largest machines and turbo machines with a special foundations ( Group T ). Good 0 to 2.80 mm/s Acceptable...
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