BK Vibro 5704-S Explosion Proof Acceleration Sensor Instructions

BK Vibro 5704-S Explosion Proof Acceleration Sensor

FAQ

Frequently Asked Questions

• Can I install the sensor in a hazardous environment?
  • The sensor is explosion-proof and suitable for use in hazardous environments. Please refer to the manual for specific details.
• How do I calibrate the sensor?
  • Calibration instructions can be found in the manual. Follow the step-by-step guide provided.

Note!

• Before operating the product the manual must be read and understood.
• If necessary you may order the manual in the missing European Union language under the following address: www.bkvibro.com

Application

• The sensor 5704 is an uni-axial charge type acceleration sensor.
• It is suitable to be used in hazardous areas (ATEX) and can be used indoor or outdoor.

Intended Use

• The sensor type 5704 is an intrinsically safe equipment. In connection with the external charge amplifier 2667 it is used for the measurement of vibration acceleration on rotating machinery like turbines, pumps, compressors, etc.
• The design 5704-W1 features additionally a built-in low pass filter and is particular suitable for gas turbine monitoring. The use of a 5704 sensor is only permitted according to the specifications stated in this manual. The use of this sensor serves exclusively the purpose of measuring mechanical vibrations.

Warning

• If the sensor will be used in a manner which is not specified in the instructions function and protection provided by the sensor may be impaired.

General

The 5704 acceleration sensors are working according to the piezoelectric shear principle. Inside the sensor, a piezo ceramic and an internal seismic mass form an oscillatory spring-mass damping system. As soon as vibrations are induced into the system, the mass exerts a changing force onto the ceramic. Due to the piezo effect, electric charges occur, which are proportional to the acceleration.

Mechanic

Delivery extend

• Sensor 5704
• 3 Hexagon socket head cap screws M4 x 12
• Hex key
• Mounting template
• Instruction manual 5704

Connecting cable

Connection

• A = + (Grey)
• B = – (Black)

The sensor housing must be safe grounded to potential equalization.

Cable gland

Progress MS EX

Warning

• ATEX-certificate from cable gland must be considered.

The cable gland must be protected against mechanical shock, according EN 60079-0, section 26.4.2.

Installation

Coupling

As a general rule, the following applies:

• The acceleration sensor is an additional parasitic mass which loads the object on which it is mounted, and this changes the vibration behaviour if it is too large.
• The weight of the acceleration sensor should always be lower at least by a factor ten than the weight of the object onto which it is mounted.
• The sensor requires a friction-locked, contact resonance-free, rigid mounting to the object, particularly for measurements at high frequencies.
• The sensor has an ARINC footprint. A mounting template is part of the delivery extent.

1. Prepare the mounting surface in the area of the sensor machined flat (Mounting surface 0.8).
2. Provide a size M4 3 threaded holes 10 mm deep in the surface of the machine according to mounting template.
3. The hole must be machined – flat mounting surface!
4. Apply a thin film of silicone grease on the mounting surface to prevent contact resonance.
5. Secure screws (e.g. with LOCTITE 243 medium strength, or LOCTITE 270 high strength).
6. The sensor has to be fixed with the enclosed three M4 screws. Tightening Torque: 2.9 Nm.
7. Optional the screws can be fixed by a wire through the safety holes of the screws.

Measuring direction / Mounting position

• There are no limits to the measuring direction. The sensor can be used in any mounting position.

Polarity

• Acceleration of the sensor into the basis in direction of the Z-axis results in a positive signal on the gray signal wire or left signal pin.

Warning: Special conditions for safe use

• The Enclosure of the sensor is connected to the screen of the cable. A proper grounding installation e.g. according to EN 60079−14 is to be observed.

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
• environmental influences (e.g. humidity).

The sensor is suitable for use in potentially explosive surroundings of categorie 1. When a cable transition is made from explosion-protection zone 0 to explosion-protection zone 1 a gastight lead-through element with protection class IP67 must be inserted.

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.

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.

Explosion protection

EC type examination certificate (www.bkvibro.com)

Table: 10-1 category

Category 1
Temperature class : T6,

T4

| Ambient temperatures:

-40 °C < Tamb < 75 °C

-40 °C < Tamb < 125 °C

Category 2
Temperature class : T6,

T4

| Ambient temperatures:

-40 °C < Tamb < 75 °C

-40 °C < Tamb < 125 °C

The maximum ambient temperature includes self-heating of the sensor.
Hot surfaces, which sensors can be mounted on, must also be considered with regard to ambient temperature.
A temperature reduction of 20% must be applied to the particular ignition temperature of present gases (according to EN 1127-1).

Supply network

Acc. to type of protection, inherent safety Ex ia IIC to be connected to a certified, intrinsically safe circuit only

Maximum values:

• Ui = 7.4 V
• Ii = 25 mA
• Pi = 185 mW
• Ci = See Table 10-1
• Li = 30 μH

HINT!

It is to be noted that the overall capacity Ci increases by attaching different cable length to the 5704. The appropriate value is to be inferred from the following table.

Tabelle 10-1:  Total capacities

Order Code

Technical Data

Dynamic

• Measuring range: ± 2 000 ms-2 peak
• Sensitivity at 159.15 Hz: 10 pC / ms-2 ± 5 %
• Resonance frequeny: min. 25 kHz / typ. 28 kHz
• Frequency response of 5704-S: ± 10 %: 1 Hz … 10 kHz

• Frequency response of 5704-W1 (with low pass filter at 2 kHz)): 1 Hz (± 10 %) … 2 000 Hz (± 3 dB)

• Amplitude linearity: > 1% increase per 2 000 ms-2
• Transverse sensitivity: < 4 %
• Thermal sensitivity shift, typical: ± 10 % (- 53 °C … + 125 °C)

Electrical

Resistance, typical: Between signal pins Each signal pin to case| ****

≥  10 GΩ   (+25 °C)

≥  10 GΩ   (+25 °C)

---|---
Insulating resistance:

Signal wires isolated from case

| ****

≥ 100 MΩ (+25 °C)

Capacity,, typical:

Between signal pins (excluding cable) Either signal lead to case Unbalanced between pins

| ****

12.2 nF

< 30 pF

< 2 pF

Environmental

Overload capacity (peak) Shock limit (1ms half sine) Sinusoidal vibration limit| ****

± 20 000 ms-2 peak

± 5 000 ms-2 peak

---|---
Base strain sensitivity, typical| 0.008 ms-2 / µε
Temperature transient sensitivity, typical measured with 3 Hz high pass filter| ****

0.05 ms-2 / °C

Electromagnetic sensitivity, typical (50 Hz, 38 mT)| ****

25 ms-2 / T

Physical

Maintenance and repair

• All sensors of the 5704 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.

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.
• The customer has to notify the supervising authorities of the initiation of explosion-protected systems as well as of any re-operation after substantial changes or maintenance work.
• 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 IEC60079-14 resp. the relevant country-specific regulations for explosion-protected systems.

Disposal

After use, dispose of the systems, cables and sensors in an environmentally friendly manner, in accordance with the applicable national provisions.
WEEE-Reg.-No. DE 69572330

EU Decleration of Conformity

Contact Us

Brüel & Kjær Vibro GmbH

• Wittichstrasse 6 64295 Darmstadt Germany
• Phone: +49 6151 428 0
• Fax: +49 6151 428 1000

Brüel & Kjær Vibro A/S

• Lyngby Hovedgade 94, 5 sal 2800 Lyngby Denmark
• Phone: +45 69 89 03 00
• Fax: +45 69 89 03 01

BK Vibro America Inc.

• 1100 Mark CircleGardnerville NV 89410 USA
• Phone: +1 (775) 552 3110

Corporate E-Mail: info@bkvibro.com
Homepage: www.bkvibro.com

Hotline

• Phone: +49 6151 428 1400
• E-Mail: support@bkvibro.com

Homepage

• www.bkvibro.com

Corporate E-Mail

• info@bkvibro.com

Copyright © 2024 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.

Sensor 5704 ● © Brüel & Kjær Vibro ● 06/2024 ● C104722.002 / V08
Subject to technical changes

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