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Cirrus MK427, User Manual

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Cirrus MK427 User Manual Download Page 8

MK:427 Environmental Noise Microphone 

 

 Page 8 of 23

 

 

Mounting Information 

 
The unit is supplied with a standard mounting kit to enable the unit to be fixed to a pole or similar. 
 
3 x Jubilee clips 
2 x U-Bolts with washers & nuts 
 
The optional CM:427 mounting kit can be used to mount the MK:427 onto a building or other fixed 
structure. 
 
 

Summary of Contents for MK427

Page 1: ...vironmental Noise Microphone Page 1 of 23 MK 427 Environmental Noise Microphone Revision 9 This manual the software to which it relates the program code and drawings are all Copyright Cirrus Research...

Page 2: ...Research plc No liability is accepted for any inaccuracies or omissions in this manual although due care has been taken to ensure that is it complete and accurate as possible Accessories supplied by C...

Page 3: ...427 12 Routine verification using the electrostatic actuator system 12 Explanatory Note The principle of electrostatic actuation 12 Typical time history trace during using the electrostatic actuation...

Page 4: ...er during a Reference Calibration First Steps Once you have received shipment of your new MK 427 Noise Sensor unit we would recommend the following stages to setup and install the equipment Stage 1 Un...

Page 5: ...door noise sensor This high quality outdoor environmental noise microphone system is ideal for integrating with other data logging and external measurement systems The mechanical and acoustic design o...

Page 6: ...hich is the most commonly used frequency weighting for the measurement of environmental and industrial noise levels The 4 20mA current loop output is ideal for integration to many process measurement...

Page 7: ...MK 427 Environmental Noise Microphone Page 7 of 23 MK 427 Microphone Unit System Diagram...

Page 8: ...rmation The unit is supplied with a standard mounting kit to enable the unit to be fixed to a pole or similar 3 x Jubilee clips 2 x U Bolts with washers nuts The optional CM 427 mounting kit can be us...

Page 9: ...noise profiles for the area Install the sensor at a location nearby to where the environmental noise is most likely to cause annoyance to neighbouring residential areas or other sites Legislation oft...

Page 10: ...power supply within the range of 9VDC to 36VDC The maximum current for normal operation is 75mA The power supply for the unit must be independent of the isolated loop circuit Isolated Loop circuit Whi...

Page 11: ...Noise Microphone Page 11 of 23 If the installation requires that the factory supplied 10m cable must be replaced then please refer to Appendix 1 Internal wiring connections for the connection details...

Page 12: ...ime to settle properly before reading the value electrically When this voltage level is applied the actuator excites the microphone to a specific level which is shown on the Factory Configuration Info...

Page 13: ...level on Factory Configuration Sheet 90 6 dB So difference between output and factory tested setting 0 7dB or 0 7 10 0 07mA Typical time history trace during using the electrostatic actuation process...

Page 14: ...e note that this procedure should not be carried out unless the overall calibration of the system needs to be verified and is included in this manual for reference only To create a reference calibrati...

Page 15: ...utput current given in the table below This provides a reference calibration level so that the current output is now proportional to the noise level The current will depend upon the range of the instr...

Page 16: ...actuator is dependent upon the position of the actuator drive plate above the microphone grill and will vary slightly depending upon how tightly it has been screwed down Very small changes in position...

Page 17: ...ifications Current Loop Output See the Factory Configuration Information sheet Minimum loop voltage 10V Maximum loop voltage 30V External Power See the Factory Configuration Information sheet Optional...

Page 18: ...ion only and may be different on a specific MK 427 unit depending upon the configuration of the unit R59 R2 R35 R46 SW1 SW2 R1 Cable Connections Yellow Electrostatic actuator control line Green Power...

Page 19: ...ophone Page 19 of 23 Appendix 2 DC Voltage output option To convert the 4 20mA output current to a DC voltage output connect LOOPOUT to the Loop Power Input Ground via a 100ohm resistor for a voltage...

Page 20: ...han 70dB A As an example if the electrostatic actuation system is generating a level of 90dB and the ambient level is 85dB the resulting level will be 91 1dB It is also likely that the background nois...

Page 21: ...ment Description The following equipment manufactured after 1st January 2009 MK 427 Environmental Noise Microphone Along with standard accessories According to EMC Directives 89 336 EEC and 93 98 EEC...

Page 22: ...er there will be a reduced charge for their replacement during the annual Traceable Calibration 8 On completion of the annual Traceable Calibration by Cirrus Research plc or an official Cirrus Calibra...

Page 23: ...s Research authorised distributors and agents are also available from the Internet Web site at the address shown below Main Office Cirrus Research plc Acoustic House Bridlington Road Hunmanby North Yo...

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