Gracey & Associates Hire and Calibration

Accelerometers and Accelerometer Signal Conditioning

Gracey & Associates hire a range of accelerometers, vibration meters and monitoring equipment, supplied by the leading manufacturers.

All our accelerometers, vibration meters, microphones etc., are delivered with current calibration certificates, traceable to UKAS. Our ISO 9001 laboratory is audited by British Standards and we are Sponsor Members of the Institute of Acoustics.

Gracey & Associates are an independent organization with over 30 years experience of sound and vibration solutions and this web site has over 500 pages of information.

Hire is the cost effective solution with overnight access to the latest and best instrumentation.

Gracey & Associates   01933 624212

Sound and vibration instrumentation hire and calibration

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 B&K - Bruel & Kjaer piezoelectric charge accelerometers - or Metra IEPE / ICP accelerometers

Type	Frequency	Sensitivity	Sensitivity	Weight	Kit	Daily Rate *
B&K 4366	0.2 Hz to 8 kHz	4.3 mV/ms-2	4.5 pC/ms-2	28 grams	yes	£ 4
B&K 4370	0.1 Hz to 5 kHz	8 mV/ms-2	10 pC/ms-2	54 grams	yes	£ 4
B&K 4378	0.1 Hz to 4 kHz	26 mV/ms-2	32 pC/ms-2	175 grams	yes	£ 4
B&K 4381	0.1 Hz to 5 kHz	8 mV/ms-2	10 pC/ms-2	43 grams	yes	£ 4
B&K 4384	0.1 Hz to 13 kHz	0.8 mV/ms-2	1 pC/ms-2	11 grams	yes	£ 4
B&K 4393	0.1 Hz to 17 kHz	0.5 mV/ms-2	0.32 pC/ms-2	2.4 grams	yes	£ 4
B&K 4505 **	0.1 Hz to 16 kHz	0.3 mV/ms-2	0.3 pC/ms-2	4.5 grams	no	£ 3

To see the manufacturer's detailed specification click the accelerometer type number. To see the accessories typically included in Bruel & Kjaer accelerometer hire kits - click here.

** The 4505 has an integral UNF 10-32 stud and includes a DB 3585 mounting bracket, a 1.2 m accelerometer cable with microdot connectors, but no other accessories.

Accelerometer are fairly robust but the cables are easily damaged, so please take care as any damage must be charged for and usually means a replacement cable.

Voltage sensitivity depends on the capacitance of the accelerometer and the cable - we show typical values for 1.2 m cables. Charge sensitivity is independent of cable length. To convert the sensitivities to 'g' use the relationship : 1 g = 9.81 ms^-2 : for example 8 mV/ms^-2 ≈ 80 mV/g or exactly 78.48 mV/g

*** We stock both the B&K JJ 2615 and the Nor 1447 preamplifier input adaptors.

There are two main types of accelerometer, the traditional piezoelectric [PE] charge accelerometer and the Line Drive type, sometimes called ICP, DeltaTron, Isotron, Constant Charge Line Drive [CCLD] or other trade names. The official name for these types is IEPE = Integrated Electronic Piezo Electric and because of the internal electronics the analysis equipment must include suitable power supplies. To avoid confusion and keep life simple, all the B&K accelerometer kits we supply and listed above are the piezoelectric charge type for direct use with both voltage or charge amplifiers.

We also stock Metra general purpose IEPE line drive accelerometer kits.

Metra KS76   Accelerometer Kits - IEPE Line Drive type

£ 4 a day *

Metra KS 76 are general purpose IEPE - Integrated Electronic PiezoElectric accelerometers, supplied with a range of accessories: also know as ICP or Integrated Circuit Piezoelectric - see the above notes.

Ideal for use with a B&K 2250 meter which has built-in engineering units and can be supplied with the FFT option for narrow band analysis -

Metra KS76 details


Vibration Measurement using a Sound Level Meter

Sound level meters can also be used for measuring vibration if the microphone can be replaced with an accelerometer. To measure low frequency vibration the meter should have a Linear or Flat setting or include the appropriate filters

The Nor 110 Sound Analyser is a good example of this, as it has both engineering units and vibration analysis filters built-in. It also measures down to 1 Hz. With other meters, the acceleration levels may be in dB, but they are easily converted. For further information on using a sound level meter for vibration monitoring, plus a vibration nomogram and a dB to engineering units conversion chart, visit our download page.

The B&K 2250 also has built-in engineering units and can be supplied with the FFT option for narrow band analysis.

If you already own a suitable meter, we also hire input adaptors as well as accelerometers and calibrators *** see above.

B&K 2635   Bruel & Kjaer Charge Amplifier

£ 12 a day *

Multi purpose, low noise charge amplifier and signal conditioning unit. Ideal vibration front-end for DAT recorders, analysers etc., with BNC output.

Frequency Range 0.2 Hz to 100 kHz with adjustable upper and lower frequency limits
+ internal oscillator for system calibration

B&K 2635 details

B&K 4294   Bruel & Kjaer Vibration calibrator - hand held

£ 5 a day *

Battery operated for calibration of vibration systems - accelerometers up to 70 grams in weight.

The RMS acceleration level of 10 ms^-2 = a velocity of 10 mm/s and a displacement level of 10 µm at 159.15 Hz, accuracy ± 3 %

B&K 4294 details

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For other applications click a link

General Vibration

Ground Vibration

Hand arm Vibration White Finger and Whole Body Vibration

Vibration Measurement using a noise meter


* Our standard hire charges are based on a 4-day minimum period, other options.

Gracey & Associates   01933 624212

BSI accreditation for instrument hire and calibration

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over 500 pages of information plus a glossary with hundreds of terms and parameters and our calibration service.