Principle of Acceleration Sensors

AS - 020 DATA SHEET

© AS020E 09.07.02 of 2 Brüel & Kjaer Vibro Leydheckerstr. 10 D-64293 DarmstadtTel. : +49 (0)6151 428-1400 Fax : +49 (0) 6151 428-1401 E-Mail : [email protected]

Acceleration Sensor AS - 020

1 Application The acceleration sensor AS-020 is used for measurement of vibration acceleration.

AS020-1 (020708)

43

,5

M8; 6mm deep/ 21,6

SW 22

ACCELERATION

S/N:

SENSOR

12

54

Type: AS-020

Fig. 1 Acceleration Sensor AS - 020

2 Measuring Principle Acceleration sensors operate in accordance with the piezoelectric compression principle. Inside the sensor, a spring/mass damping system is formed by a piezoceramic disk and an internal sensor mass.

When introducing vibrations into this system, the mass exerts an alternating force on the ceramic disk and due to the piezoelectric effect electric charges are caused which are proportional to acceleration.

An integrated charge amplifier increases the output signal to a usable signal level.

AS - 020 DATA SHEET

3 Technical Data Type Piezoelectric acceleration sensor with integrated charge amplifier

Sensitivity 100 mV/g ± 5 % 10,2 mV/m/s2 ± 5 %

Fig. 2 Typical frequency response of sensitivity

Overload capacity continuous 500 g shock 5000 g (all directions) Fall from 1.5 m on concrete without damage

Dependence of sensitivity on operating voltage < 1 %

Sensitivity deviation due to temperature - 22 °C - 3 % + 22 °C 0 % + 65 °C + 2,5 % + 120 °C + 5,5 %

Operating temperature range - 50 °C ... + 125 °C

Storage temperature range - 50 °C ... + 150 °C

Measuring range ± 80 g (UB = -24 V...-30 V) ± 40 g (UB = -20 V) ± 20 g (UB = -18 V)

Linearity error ≤ 0,1 % (0,1 g ... 10 g)

Transverse sensitivity (80 Hz) ≤ 7 %

Frequency range 4 ... 10 000 Hz (± 0,5 dB) 1,5 ... 15 000 Hz (± 3 dB)

Resonance frequency 35 kHz ± 3 kHz

Noise 0,1Hz-100 kHz ≤ 0,6 mVss 0,1Hz- 1 kHz ≤ 0,2 mVss

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AS - 020 DATA SHEET

Voltage supply UB -24 V (-18 V...-30 V)

Output impedance ≤ 5 Ω

Open-circuit potential (- 50 °C ... + 125 °C) -12 V ± 2 V

Temperature sensitivity < 0,01 g/K

Strain sensitivity < 0,0003 g/ ( µm/m )

Magnetic field sensitivity < 0,003 g/mT

Insulation resistance (Housing supply voltage 0 V) ≥ 20 MΩ

Dielectric strength of insulation 500 VRMS

Interference voltage suppression between housing and 0 V (frequency-dependent) < 0,5 kHz ≥ 140 dB 1 kHz ≥ 120 dB 10 kHz ≥ 100 dB

Supply voltage feed through ≤ 36 kHz < -30 dB

Stability with capacitive load 0 ≤ CL ≤ 470 nF

EMC EN 50082-2: 1995 item 1.1, 1.2, 1.4, 2.1, 2.2

EN 50081-2: 1994 item 1.1, 1.2

Housing Stainless steel, hermetically sealed, rugged industrial design

Protective system IP 66

Weight 70 g (2.47 oz)

Fixing Central fixing by means of stud M8 x 14; max. tightening torque 4.5 Nm M8 / 1/4“ 28 UNF; max. tightening torque 3.5 Nm

© AS020E 09.07.02 of 6

AS - 020 DATA SHEET

Connection

KPT connector in accordance with MIL-C 26482

Connector assignment

A = -UB

B = Signal

C = 0 Volt

Fig. 2 Connector assignment AS-020

Admissible length of signal cables

l = 470C x fK

l = admissible length of signal cable [ m ]

CK = cable capacity [ nF/m ]

f = max. effective transmission frequency [ kHz ] (for f <1 kHz, f is to be set to 1 kHz)

470 = product of frequency and max. capacitive load

If the cable length to be bridged exceeds the calculated value, a line driver is to be provided at a suitable location.

of 6 © AS020E 09.07.02

AS - 020 DATA SHEET

4 Mounting

4.1 Coupling

General rule: The weight of the acceleration sensor should be lower at least by the factor ten than the weight relevant for vibration measurement of the measuring object onto which it is mounted.

Reason The acceleration sensor is an additional mass which applies a load on the measuring object and changes the vibrational behaviour of the latter.

4.2 Mounting of acceleration sensor

Note: The acceleration sensor requires a friction-locked, contact resonancefree and rigid mounting to the measuring object, in particular for measurements at high frequencies.

♦ AS-020 is to be mounted with the stud supplied.

Selectable:

• Stud M8 x 14

• Stud M8 / 1/4“ 28 UNF

The sensor can be mounted in any position.

515 12

Mounting surface0,8***

90°

M8

max. reach of screw

AS/ASA020D (20000124)

Threaded stud securedwith LOCTITE

Acceleration SensorType AS/ASA-020

ø 28>

Fig. 3 Mounting

© AS020E 09.07.02 of 6

AS - 020 DATA SHEET

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♦ The mounting surface in the area of AS-020 must be plane and machined.

♦ For version with protective cover, the mounting surface must be designed in accordance with data sheet "protective cover".

♦ Provide mounting surface with threaded hole M8 or 1/4“, 12 mm deep

♦ Apply a thin film of silicone grease on the mounting surface to prevent contact resonance

♦ Screw stud into the mounting surface in accordance with fig. 3 and secure same (e.g. with LOCTITE)

♦ Max. reach of screw ≤ 5 mm for acceleration sensors to be adhered to

♦ Screw AS-020 onto the stud. Observe max. tightening torque in accordance with stud

5 Electrical Connection Installation of connecting cable ♦ Use protective cover, metal conduit or protective tubes to protect the

cable from mechanical damages as well as to safeguard the increase of EMC.

♦ Connecting cable not to be installed in parallel to energy lines. If this is not possible, the minimum distance should be 1 m.

If the connecting cable is to be extended ♦ Use shielded signal cables only

♦ Protect connecting points with a suitable junction box (e.g. AC-121)

Linking the connecting cable with the monitoring system ♦ Assign terminals or sockets in accordance with the operating

instructions for the monitoring system.

Linking the connecting cable with AS-020 ♦ Mount KPT bayonet connector on AS-020 and secure same by 1/4

revolution.

Sicherer BereichSafety areaZone sûre

AC-293 SicherheitsbarriereAC-293 Safety barrier

AC-293 Barrière de sécurité

PotentialausgleichschienePotential equalization system

Bus de compensation de potentiel

Klemmenschutzgehäuse AC-221Terminal protective housing AC-221

Boîtier de protection du bornier AC-221

Beschleunigungs-Sensoren Typ AS-02x/030 / ASA-02xAcceleration sensors type AS-02x/030 / ASA-02x

Accéléromètres type AS-02x/030 / ASA-02x

* Schirm an Kabelverschraubung Shield on cable screw Blindage sur boulonnage

AS-02x/03x SensorCapteur AS-02x/030

zur Elektronikto electronicvers l'électronique

Explosionsgefährdeter BereichHazardous area

Zone dangereuse EX

Klemmenschutzgehäuse EExiTerminal protective housing EExi

Boîtier de protection du bornier EExi

ASA-02x SensorCapteur ASA-02x

Wichtig! Beachten Sie vor der Verdrahtungunsere "Allgemeine Erdungsempfehlung".Important! Please consuit our "GeneralGrounding Recommendations" beforeproceeding with any cable installations.Important! Avant d'effecteur le câblage,veuillez observer nos "Recommandationsgénérales pour la mise à la terre".

Adernfarbe / Core colour / Couleur des brinsRD = rot / red / rougeWH = weiß / white / blancBK = schwarz / black / noirBN = braun / brown / brunBU = blau / blue / bleuYE = gelb / yellow / jauneYE/BK = gelb/schwarz / yellow/black / jaune/noirGN/YE = grün/gelb / green/yellow / vert/jaune

AS-030 SensorCapteur AS-030



9001/00/280/020/101

9001/00/280/050/101

PE > 1,5 mm

06.04.0106.04.01

Bearb.Gepr.

Datum

Änderung

GiegelerHölzel

Name

*PE > 1,5 mm

ua

2

RD=-24V

WH=0V

YE=SIG

PE > 1,5 mm

2 * 2

WH

RD

BK

YE3

1

2

RD

BK

YE

WH

-24V

COM

0V

SIG

PA/ > 4 mm

PA/ > 4 mm

ua

2

RD=-24V

YE=SIG

WH=0V

BK/YE4

2

3

2

1 RD

YE

BK

WH

4WH

YE 3

3

4

RD

BK

2

PE > 1,5 mm2

PE > 1,5 mm

PA/ > 4 mm

WH=COM

YE=SIG

BK=0V

RD=-24V

ua

WH

BK

YE

RD

Zeichng. Nr.

2

COM

0V

SIG

-24V

-24V

+2 WH

YE-1

-1

+2

RD

BK

COMWH

0V

SIG

RD

BK

YE

Leydheckerstr. 10, 64293 Darmstadt

Brüel & Kjær Vibro

Schumann25.11.04C102 222.001

Principle of Acceleration Sensors

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