Bruel Kjaer Vibro AS-667 Acceleration Sensors Instructions

: June 4, 2024
: Bruel Kjaer Vibro

Table of Contents

Bruel Kjaer Vibro AS-667 Acceleration Sensors
User Qualification
Intended Use
Recommendations to User
Application
Measuring Principle
Mounting
- Coupling
EMV
Calibration
Disposal
Technical Data
Accessories
Connection Diagram
CE Declaration
Contact
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

Bruel Kjaer Vibro AS-667 Acceleration Sensors

User Qualification

Ensure that all work in conjunction with our systems is performed by skilled, expert and authorized workers (for ATEX systems according to EN 60079-14). 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 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.
Mounted sensors must not be used as steps.
Ensure that system is exposed only to admissible environmental influences specified in technical system data sheet.
Maintain electrical equipment in regular intervals. Remedy defects, e.g. loose wires, defective connectors, immediately.

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 personnel concerned has received and understood it. If 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 nor safety technology without the express consent of Brüel & Kjær Vibro. Any unauthorized modification excludes Brüel & Kjær Vibro’s liability for resulting damages.

Application

The AS-667 is mainly used for measurement of vibrations at rotating machines such as turbines, pumps, compressors, etc.

Measuring Principle

The acceleration sensor operates according to the piezo-electric principle. A piezo-element and an internal sensor mass form a spring-mass system in the sensor.
If this system is subjected to vibrations the mass produces an alternating force on the piezo element. As a result of the piezo effect an electrical charge is produced that is proportional to vibration acceleration. An integrated amplifier converts this charge signal into a usable voltage signal.

Mounting

Coupling

General rule:
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 acceleration sensor is an additional mass, which loads the object on which it is mounted, and this changes the vibration behaviour if it is too large. The sensor requires a friction-locked, contact resonance-free, rigid mounting to the object, particularly for measurements at high frequencies. The cable must be attached on a non-tension basis and load-free in connection.

Bruel-Kjaer-Vibro-AS-667-Acceleration-Sensors-FIG-1

The sensor is to be installed with the threaded stud included. It can be installed in any orientation on the machine.

The mounting surface must be machined flat in the area of the sensor (roughness depth 0.8 µm, flatness 0,05 mm) and have a minimum diameter of 28 mm.
Supply installation surface with threaded bore M8 according to drawing (fig.4-1).
The bore must be countersunk and cleaned.
Screw threaded stud into installation surface according to drawing (fig. 4-1) and secure (LOCTITE 243 intermediate strength or LOCTITE 270 high strength).
Apply thin layer of silicone grease to the installation surface to reduce contact resonance.
Screw sensor onto the threaded stud with a mounting torque of 3.5 Nm (key width 22 mm) and secure (LOCTITE 243 medium strength or LOCTITE 270 high strength).

EMV

EN 61326-1
Through electromagnetic 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.

Calibration

In the event of a calibration request, we offer the following services:

Factory calibration by Brüel & Kjær Vibro
Calibration traceable to national standards by our DAkkS accredited calibration laboratory

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

Technical Data

Features

Robust design
M12 plug
Constant current supplied
General purpose

Applications
The accelerometer AS-667 is ideally suitable for general measurements on rotating machinery. It covers a broad application range like monitoring of turbines, fans, pumps, generators, etc.

Product Description
Scope of delivery:

Sensor AS-667
1 x Threaded bolt M8 to M8
1 x Threaded bolt M8 to 1/4″-28 UNF
Documentation

Connection

Plug connection (M12 male)

Pin 1: SIG
Pin 2: 0V / GND
Pin 3: not connected
Pin 4: not connected

Bruel-Kjaer-Vibro-AS-667-Acceleration-Sensors-FIG-2

The following performance data apply, to the extent that nothing else is indicated, under standard conditions (Ambient temperature = 25 °C, Constant current = 4 mA).

Bruel-Kjaer-Vibro-AS-667-Acceleration-Sensors-FIG-5