B K Vibro ASA-068 ATEX Explosion Proof Acceleration Sensors Instructions

B K Vibro ASA-068 ATEX Explosion Proof Acceleration Sensors

Instructions

copyright 2021 Brüel & Kjær Vibro GmbH All rights to this technical documentation remain reserved. Any corporeal or incorporeal reproduction or dissemination of this technical documentation or making this document available to the public without prior written approval from Brüel & Kjær Vibro GmbH shall be prohibited. This also applies to parts of this technical documentation.

Hints

NOTE
This manual is a part of the product. Read the manual carefully before using the product and keep it accessible for future use.

Pictograms and their Meanings
This symbol warns of dangerous situations which can result from misuse of the produc.

User Qualification
Ensure that all work in conjunction with our systems is performed by skilled, expert and authorized workers. Among these works are:

Installation and Commissioning
Installation and commissioning primarily concern work on electrical equipment. These works may be performed exclusively by electricians or workers instructed and supervised by an electrician in accordance with electrotechnical regulations/directives.

Change of System Specification
Any change of system specification has its effects on monitoring process with stationary systems and on the measuring sequence with portable measuring systems.

Intended Use
If sensors and the cables are used in a way not described in the relevant user manuals, function and protection may be impaired and serious personal damage, death or serious, irreversible injuries may result.

• Exclusively use sensor as specified in data sheet. Any use other than specified is considered inappropriate. Brüel & Kjær Vibro does not assume any liability for damages resulting from inappropriate use. The user is solely responsible. For originally intended use, see system documentation.
•  Mounted sensors must not be used as steps.
• Ensure that system is exposed only to admissible environmental influences specified in technical system data sheet.
• Handle the systems with care in order to prevent damage to the systems or personal damage due to falling.
• Maintain electrical equipment in regular intervals. Remedy defects, e.g. loose wires, defective connectors, immediately.
•  Check cable and connectors in regular intervals.
•  Never use cable to pull plug out of socket.

Hot surfaces

• In line with the user manuals, sensors and cables can be operated in extensive ambient temperature ranges, whereby they can become hot through self-heating on housing walls and can produce burning.
• When mounted at external heat or cold sources (e.g. machine parts), systems, sensors and cables can adopt dangerous temperatures, whereby burning, among other things, can occur in the event of contact.

Recommendations to User
If the use of the system in conjunction with machines or plant sections can produce risks outside of Brüel & Kjær Vibro’s responsibility, the user is expected to prepare and distribute safety technical instructions or warnings and to ensure that the person concerned has received and understood same.If the system is integrated into a machine or designed to be assembled, commissioning must not take place until the machine the system is to be integrated in conforms to the EC directives.

Prohibition of Unauthorized Modifications
System and accessories must not be changed either in construction or safety technology without the express consent of Brüel & Kjær Vibro. Any unauthorized modification excludes Brüel & Kjær Vibro’s liability for resulting damages.

Application

The ASA-068 is mainly used indoors or outdoor for the measurement of vibrations at rotating machines such as turbines, pumps, compressors, etc. If the sensor will be used in a manner that is not specified in the instructions function and protection provided by the sensor may be impaired.

General

The acceleration sensors are working according to the piezoelectric compression principle. Inside the sensor, a piezo ceramic disk and an internal seismic mass form an oscillatory spring-mass damping system. As soon as vibrations are lead into the system, the mass exerts a changing force onto the ceramic disc. Due to the piezo effect, electric charges occur, which are proportional to the acceleration. An integrated amplifier will then convert the charge signal into a utilizable voltage signal.

Delivery extend

• Sensor ASA-068/xxx/x
•  Threaded stud M8 x 14
• Threaded stud M8 x 1/4″ 28 UNF
• Documentation

Dimensional drawing

Range of application
All sensors of the ASA-06x series are certified for use in “potentially explosive surroundings” acc. to ATEX. These sensors are also suitable for use in category 1 and/or 2 equipment for gases or category 2 equipment of types of dust (ATEX).
Sensor ASA-068 is mostly used for measuring the vibrating acceleration occurring in rotating machines, such as turbines, pumps, compressors etc. The sensors may only be used acc. to the specifications made in the respective data sheet and only for the measurement of mechanical vibrations.

Connecting cable

Aderbelegung

• Constant Power supply IB

• Maximum output voltage

• 4 mA

• Min. 2 mA / Max. 10 mA, protected against reverse polarity

• +30 V

How to mount the acceleration sensor
Prior to mounting, please check

Sensor

• with regard to completeness
  •  the complete number of components
  •  no visible damages

Mounting accessories

• the complete number available (if necessary)
  •  set screw
  •  screw fittings, clamps,
• all components are compatible
  •  same thread at sensor and mounting bore at the measuring point

Line distance

• Line distance from sensor to terminal box
  • No damages at the line?

Tools

• Mounting
  •  torque wrench
  •  fork wrench
  •  Screwdriver

Installation

Coupling
As a general rule, the following applies:
The mass of the acceleration sensor should be at least ten times smaller than the vibrationally relevant mass of the measuring object, onto which it is mounted. The acceleration sensor is an additional weight for the measuring object which may influence its vibration behavior.The acceleration sensor needs a non-positive, contact resonance-free and rigid fastening to the measuring object, especially for measurements with high frequencies.

• Please mount the sensor with the enclosed set screw.
•  set screw M8 x 14 or
•  set screw M8 / 1/4“ 28 UNF

Any fitting position is possible.

Operational hints
The connecting line is protected by a stainless steel tube, make sure that it is safely connected to the equipotential bonding conductor. (volume resistanc Any fitting position is possible.

Measuring direction / fitting position

There are no limits to the measuring direction. The sensor can be used in all directions (360°). How to mount the acceleration sensor

• Make sure that the mounting surface is flat and smooth
•  Drill a 12 mm deep, M8 or 1/4″ screw thread into the mounting surface
•  Apply a thin layer of silicone grease onto the mounting surface, in order to reduce the contact resonance.
• Screw-in the set screw as shown in Figure 8-1 and secure it with e.g. LOCTITE 243 medium strength or LOCTITE 270 high-strength
•  Make sure that the maximum thread reach for acceleration sensors is ≤ 5 mm
• Screw the sensor onto the set screw. Please observe the maximum fastening torque of the set screw
•  The recommended fastening torque for the enclosed set screw is 3,5 Nm.

Hints for mounting and installation
A precondition for operational safety is “correct” installation. It protects the sensor against:

•  mechanical damages (e.g. caused by pinching of the line)
•  damages at the line caused by vibration (e.g. abrasion of insulation))
•  electric interference (EMV)
•  environmental influences (e.g. humidity, temperature).

When putting up electric systems in potentially explosive surroundings, not only the general installation instructions for electric systems have to be observed, but also standard IEC 60079-14 resp. the relevant country-specific regulations for explosion-protected systems. The sensor is suitable for use in potentially explosive surroundings of categories 1 and 2. When a cable transition is made from explosion protection zone 0 to explosion protection zone 1 a lead-through element with protection class IP 67 must be inserted according to EN 60529.

Lines and protective tubes
The sensor line as well as possible extension lines have to be protected both electrically and mechanically. Please take the local conditions into account when doing so.The connecting line is protected by a stainless steel tube, make sure that it is safely connected to the equipotential bonding conductor. (volume resistance

Marking of lines
It is very important to mark the line from the point of measurement to the connection of the electronic supervision system. It is indispensable for documentation, initiation and for the service departments and has to be done by the customer.

Customer’s responsibility
The customer is solely responsible for the correct layout of the electric system under consideration of explosion protection regulations as well as for the correct initiation. The explosion protection- and safety regulations currently valid have to be observed resp. checked by an expert, if necessary. In case that the system is put up by a sub-contractor on behalf of the customer, it must not be put into service until the sub-contractor has proven that it has been installed correctly and in conformity with the valid regulations by means of an installation certificate.

Explosion protection

EC-design test certificate (www.bkvibro.com)

IP68 (2 h at 5 bar) for version without steel protective conduit

List of standards| EN IEC 60079-0: 2018, EN 60079-11: 2012
ATEX-Marking| II 1 G Ex ia IIC T6…T1 Ga  II 2 G Ex ia IIC T6…T1 Gb

II 2 D Ex ia IIIC T85 °C …T145 °C Db

IECEx- Marking (IECEx PTB 12.0033)| Ex ia IIC T6…T1 Ga Ex ia IIC T6…T1 Gb

Ex ia IIIC T85 °C … T145 °C Db

Standards| IEC 60079-0 : 2017

IEC 60079-11:2011

EAC Ex| In compliance with TR-TS 012/2011 (TP-TS 012/2011)

EAC Ex Certificate:

RU-C-DE.AA87.B.00334

Category 1G

Temperature class: T6

T5 T4

T3, T2, T1

| Maximum ambient temperatures:

-20°C…   50 °C

-20°C…   60 °C

-20°C…   90 °C

-20°C… 125 °C

Category 2G
Temperature class: T6

T5 T4

T3, T2, T1

| Maximum ambient temperatures:

-20°C… 65 °C

-20°C… 80 °C

-20°C…115 °C

-20°C…125 °C

Category 2D
Temperature class: T6

T5 T4

T3, T2, T1

| Maximum ambient temperatures: 85 °C

100 °C

135 °C

145 °C

Supply network
Acc. to type of protection, inherent safety Ex ia IIC or Ex ia IIIC to be connected to a certified, intrinsically safe circuit only
Maximum values:

HINT
It is to be noted that the overall capacity Ci increases by attaching different cable length to the ASA-068 The appropriate value is to be inferred from the following table.

Supply
The sensor must be connected to SELV supply with limited energy (max. current see intrinsic safety values).

Polarity

A movement of the bearing housing in the direction shown below produces a positive signal.

Technical Data

Transfer| ratio| 10 mV/g ±5 % (referred to value measured at 80 Hz and 25 °C) 1,02 mV/m/s² ±5 %
---|---|---

+30 dB

|  |  |

10                                    100                      500    1k 5k 10k 20k 30k 50k 100k

Hz

ASA06x-6 (050919)

Abbildung 10-1 Typischer Frequenzgang des Übertragungsfaktors

+20 dB

|  |

+10 dB

|  |
0|  |
-5 dB|  |  
 | ****

1

| ****

3

Direction factor (80 Hz)| ≤ 8 …10 %
Actual frequency| 4 … 10 kHz (± 5 %)

1,5 … 13 kHz (± 3 dB)

Frequency of resonance| > 20 kHz
Constant Power supply IB| 4 mA

Min. 2 mA / Max. 10 mA, protected against reverse polarity

Maximum output voltage| +30 V
Measuring range (IB = 4 mA)| ± 500 g (Umax > +24 V)

± 400 g (Umax = +20 V)

± 200 g (Umax = +18 V)

Dynamic internal resistance of output| £ 300 W ( working frequency range) approx. 2 kW ( frequency of resonance) (level control 1 Veff            IB = 4 mA)
Open-circuit potential (-50 °C … +125 °C)| +12,5 V| ±1,5 V|
Temperature curve of sensitivity| ≤5 % of measured value (referred to 25 °C)
Expansion sensitivity| < 0,002 g/ (mm/m)
Magnetic field sensitivity| < 80 Hz: 0,002 g/mT

< 1 kHz: 0,018 g/mT

Insulating resistance

(housing – distribution voltage 0 V)

| ³ 20 MW
Noise voltage rejection between housing and 0 V (frequency-dependent)| <  0,5 kHz

<  1    kHz

10   kHz

|  | ³ 100 dB

³    95 dB

³    75 dB

Weight| 700 g (with protecting tubing)
Housing material| Stainless steel 1.4301
Working temperature| -50 °C … +125 °C, Note Temperature classes
Storage temperature| -50 °C … +125 °C
Overload capacity| permanent 500 g

Schock 5000 g (every direction)

---|---
Humidity| 99,99 %
Pollution degree| 3
Max. altitude| 2000 m
Mechanical resistance
Oscillation| DIN EN 60068-2-6
Shock| DIN EN 60068-2-27
Permanent shock| DIN EN 60068-2-29

Through electro-magnetic stray fields influences on the measured values may arise.  In case of disturbing influences of this type a grounded protective conduit is recommended for the signal cable.

**Maintenance and repair

**

All sensors of the ASA-06x series are maintenance-free.

IMPORTANT REPAIR INSTRUCTION:
Never open a defective sensor! It has to be replaced in case of damage. Should a defect occur at the power supply lead, the sensor has to be replaced immediately.

Error detection / rapid test
In order to detect errors, please check the rest potential. The rest potential can be checked outside the ex-sector with the help of a standard digital multimeter. The measuring function can only be checked with the help of a suitable vibration testing machine.
Error chart

Cable defectively

Set-up of measuring instruments

NOTE
Measurements should only be carried out by authorized experts and outside the explosion-proof sector. If the sensor is used in potentially explosive surroundings, please observe the standards and legal regulations valid at the time of inspection.

Disposal

After use, dispose of the systems, cables and sensors in an environmentally friendly manner, in accordance with the applicable national provisions.WEEE- Reg.-Nr. DE 69572330

Connection Drawing

Documents / Resources

| B K Vibro ASA-068 ATEX Explosion Proof Acceleration Sensors [pdf] Instructions
ASA-068 ATEX, Explosion Proof Acceleration Sensors
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