Adash 4900 Vibrio III set.pdf

8/10/2019 Adash 4900 Vibrio III set.pdf

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Adash 4900 Vibrio III

Appl icat ions:

Machine vibration diagnostics

Bearing diagnostics

Lubrication diagnostics Service activities

Product final inspection

Characteristics:

Spectrum FFT analysis

Measurement of time signals

Automatic detection of speed

Automatic determination of machine and bearing conditions Wideband measurements RMS or PEAK acceleration values (g)

and vibration velocity (mm/s)

Frequency bands measurement for bearing diagnostics

Colour display

Concurrent display of two measured values

High quality piezoelectric accelerometer with 100 mV/g sensitivity

Over-excitation, sensor fault an cable fault indicators

Possibility of connecting headphones to "listen to vibrations"

Simple control by three buttons

Ref. No.: 140408

Users Guide


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ADASH spol. s r.o. Adash 4900 Vibrio III

ADASH s.r.o., Ostrava, Czech Republic, tel.: +420 596 232 670, fax: +420 596 232 671, email: [email protected] technical and contact information can be found at www.adash.net, www.adash.cz

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Contents

What Will You Get with Your Instrument .............................................................................3Instrument and accessories.................................................................................................3

Before You Start .....................................................................................................................4

Quick Start ..............................................................................................................................5Preparation of Measurement Point...................................................................................... 5Putting in Batteries...............................................................................................................5Plugging in Vibration Sensor ...............................................................................................6Connectors ..........................................................................................................................7Measuring............................................................................................................................7

Instrument Operation .............................................................................................................8Switching on and off ............................................................................................................8Information line ....................................................................................................................9

Using of Headphones ..........................................................................................................9Selection of Measurement.................................................................................................11

Error Messages .................................................................................................................13Orientation Values of Machine and Bearing Vibrations ..................................................... 14

Technical Specif ications Adash 4900 Vibr io III ..............................................................15


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What Will You Get with Your Instrument

Instrument and accessories

The instrument case contains:- measuring instrument A4900 Vibrio III- vibration sensor - accelerometer- magnetic base for vibration sensor- coiled cable to connect vibration sensor- headphones- measuring tip for putting manual pressure on vibration sensor- 1.5V alkaline batteries

Fig. Adash 4900 Vibrio III with accessories


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Before You Start

1. Never connect any other type of sensor than ICP into an ICP marked socket!If unsure, consult the procedure with your supplier.

2. Never plug this instrument into 230 V household vol tage!

3. To power this instrument, use batteries (rechargeable) with max. nominal voltage of 1.5 V!

4. To power this instrument, use only alkaline or rechargeable (NiCd, NiMH) batteries.Regular carbon-zinc batteries are not suitable.

Ignoring any of the recommendations mentioned below may cause failure of theinstrument.

Handling voltage higher then 24 V can cause an accident.

WARNING!

Use correct battery polarity.Incorrect polarity will cause destruction of theinstrument!


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5

Quick Start

The aim of this chapter is to introduce you to this instrument, and, without reading a completeUsers Guide, enable you to measure first vibration values. This chapter does not intend to fully and in

detail describe operation of this instrument or measurement methodology. Special chapters in thisGuide are intended for this purpose.

Preparation of Measurement Point

We have to select a measurement point before the measurement itself. We want to choose itin such way that transmission of vibrations would not be attenuated. Usually this means as close to thesource of vibrations as possible (for instance at a bearing housing). We always have to measure atsolid, firm part of a machine. We should not be measuring on covers and so on. The place should beclean, without corrosion and paint. It should also be flat so a sensor would not wobble. The best is touse a measurement base, which is glued on a machine. It has a perfect finish, plastic cover, and is

made from magnetic stainless steel. This will enable you to perform the measurements on themachine at any time under the same conditions. This measurement repeatability means that you willbe able to compare the values well.

To attach the sensor use a magnetic sensor clamp (do not forget to remove a magnet coverfrom it, which closes a magnetic field and protects the magnet from long-term weakening in storage).

Putting in Batteries

Batteries are accessible after opening a lid at a bottom part of the instrument. Open the lid bypressing its lower edge (the edge with hinge), the lid upper part opens easily - see figure. Do not everuse force! Proper polarity is shown on the picture.

Do not forget to switch the instrument off before opening the power battery lid!Never handle the power batteries with the instrument switched on!

Fig. Opening of the lid

1. Press gently

2. Open


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Fig. Placement of power batteries Fig. Proper cell polarity

Plugging in Vibration Sensor

To measure a vibration signal we need to plug in the vibration sensor with ICP power. Theplugged in sensor must be a standard accelerometer with 100 mV/g sensitivity. The instrument isequipped by its own source of ICP power for connected sensor. The sensor needs to be connected atthe right input plug by a supplied cable.

Fig. The instrument with a sensor connected


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Connectors

Fig. Top view of connectors

Measuring

Screw the sensor onto the magnetic base. Do not forget to remove the plastic cover and ametal washer (it closes a magnetic field for longer service life of the magnet) before measuring. Placethe plastic cover and the metal washer back on the magnet after measuring.

Place the magnet on a measuring point very carefully. Best is to rest the edge of the magneton its side and then slowly lower the sensor onto a machine. If you bring the magnet near to themachine with its whole area hitting the machine all of the sudden, then the strong impact canirreversibly destroy the sensor.

In case you use a measuring tip instead of the magnet, measured values are not going to bestable. This in not surprising. The measured values depend to a large extent on a pressure of the tip atthe measurement point. The magnet that attaches the sensor generates a constant pressure so the

values are stable.

At tention!! !Use the measuring tip only in hard to reach places, where it is not possible to place themagnetic base.

connector to plugin the sensor

connector to plug inheadphones

(stereo jack 3.5mm)


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Instrument Operation

Switching on and off

The instrument is switched on by pressing of the middle button marked with .

Fig. Buttons / Switching the instrument on

Provided that batteries with sufficient voltage are placed in the instrument then a display willshow an instrument Logo. If the batteries are weak the VIBRIO sign is bordered in red.

Fig. Switching on with Fig. Switching on with Fig. Switching off

weak batteries

The instrument is switched off by pressing and holding the same button for a longer time.Before the instrument switches of the sign POWER OFF lights on the display, slowly goes out, andthe instrument switches off if you release the button.

Instrumenton / offbutton


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Information line

After powering on the display shows measured data. Beyond descriptions of the measured values andtheir actual values the display shows an information line in its upper part.

Fig. Information line on a display

Meaning of Displayed Symbols:

- moving wave signifies measurement in progress,

- setting of headphone output volume - is indicated by yellow colouring of the bars,

- this symbols shows an approximate battery status. The more is the symbol filled in,the more battery power remains. If the status goes under 20 %, the remaining energy shows in red, if itis insufficient, the symbol is red and the instrument switches itself off.

Battery status symbol:

100% approx. 50% under 20% just before switching off

Using of HeadphonesThe instrument is equipped by a 0.5 W amplifier for connecting of headphones and listening

to a measured signal. We can connect the headphones by a stereo 3.5 mm jack marked phones onthe top of the instrument (see figure in the Connectors chapter). After connecting we can hear a signalfrom the vibration sensor in the headphones. It is possible to choose suitable a volume after pressing

shortly. The display will show the volume bars. The volume can be changed by control buttons . The set volume is indicated on the display. When the maximum volume is reached, the symbol willbecome orange, otherwise the amount of yellow filling shows the actual volume. If the headphones are

off, the symbol is grey. Repeated press of the power button brings the instrument back to a regimeof choosing a measurement type.


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Fig. Display during volume setting

Off approx. 50% MaximumFig. Displayed volume

When the instrument is switched on or off, range is changed, or the sensor is connected ordisconnected, a short, unpleasant crack can be heard due to a transitional effect. This is not a defect.

Be careful not to overload the headphone amplifier by excessive volume. This will distort asignal in the headphones!

You can use any stereo ormonoheadphones with nominal impedance higher than 8 .Both

output stereo channels are connected in parallel within the instrument for mono listening of themeasured vibration signal.

Button to switchbetween measuring /

volume control

Increase volumebutton

Decrease volumebutton


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Selection of Measurement

A selection of measuring screen (method) can be performed by the buttons. After pressof a button an empty screen is shown without measured data, and the measuring starts.

Fig. Measuring screen selection buttons

Measuring screenselection buttons


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Error Messages

Error in sensor connection

This error signifies incorrect connection of a sensor, unsuitablesensor type, broken cable etc.

Overload Error

If an input signal is too strong (higher than 12V peak), and theinstrument cannot process it, the overload error is displayed. Theinstrument is not capable of measuring this signal.

Measurement Error

If there is a break in communication between measuring anddisplay boards inside of the instrument, this measurementinitialisation error is displayed (MEAS INIT). If you see this error, itmeans that the instrument is malfunctioning, and we recommendto send it to the manufacturer for a check.


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Orientation Values of Machine and Bearing Vibrations

Graphs, according to which the instrument determines acceptable vibration limits depending on

machine speed.

0.0

1.0

2.0

3.0

4.0

5.0

6.0

0 500 1000 1500 2000 2500 3000 3500 4000

speed [RPM] ---->

Vel(10-1000Hz)

[mm/sRMS]---->

0

0.04

0.08

0.12

0.16

0.2

0.24

Vel(10-1000Hz)

[ipsRMS]---->

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

0 1000 2000 3000 4000 5000 6000 7000 8000

speed [RPM] ---->

Acc(5k-16kH

z)

[gRMS]---->


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Technical Specifications

Input: - 1x ICP powered accelerometer with 100 mV/g sensitivity for measurement and recording of vibrations

Output: - 1x monoaural AC signal 8 / 0,5 W for external headphones (listening to measured vibration signal)

Measuring Ranges: - 10 Hz - 1000 Hz [mm/s]

- 2 Hz - 200 Hz [mm/s]

- 5 kHz - 16 kHz [g]

- 1.5 kHz -16 kHz [g]

- 0.5 kHz -16 kHz [g].

Data Processing: - measurement of effective values (TRUE RMS)

- measurement of peak values (TRUE PEAK)

- estimate of speed frequency (120 12000 RPM)

- spectrum analysis

- time signal

Display: - coloured OLED display 128 x 128 pixels, diagonal 1.5 (38mm)

Measurement Range: - automatic, max.80g peak for sensor 100mV/g, +/-12V peak AC

Power: - 2x1.5V (AA size alkaline batteries) or

- 2x1.2V (NiMH AA size rechargeable batteries)

Consumption: - approx.450 mA with headphones

Dimensions: - 150 x 60 x 35 mm

Weight: - 340 g including batteries (without cable, sensor and magnet)

- 540 g including batteries, cable, sensor and magnet)

Accessories: - vibration sensor, coiled cable to connect vibration sensor, magnetic clamp for vibrationsensor, headphones, recording cable with 3.5 mm jacks, measuring tip for manual pressureon the sensor, 1.5V alkaline batteries, transport case.

Technical Specifications Adash 4900 Vibrio III

Adash 4900 Vibrio III set.pdf

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