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Cirrus Research MK:440, Инструкция по установке и эксплуатации, Страница: 11 / 13

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MK:440 Environmental Noise Microphone                                                   
 

 Page 11 of 13 

9

 

Available Ranges and Equations 

The following ranges can be specified for factory delivery (64-134dB is the default setting if not 
specified): 
 
 

Nominal 
Range 

DIP 
SW1/1 

DIP 
SW1/2 

DIP 
SW1/3 

I

 _OUT (mA) DC 

Example 
Value at 9.4mA 

64-134dBA 

ON 

OFF 

ON 

dB = (10 x 

I) 

+ 20 

114dB 

54-124dBA 

ON 

ON 

OFF 

dB = (10 x 

I) 

+ 10 

104dB 

44-114dBA* 

OFF 

OFF 

ON 

dB = (10 x 

I)

 

94dB 

34-104dBA* 

OFF 

OFF 

ON 

dB = (10 x 

I) 

–

 10 

84dB 

24-94dBA 

OFF 

OFF 

OFF 

dB = (10 x 

I) 

–

 20 

74dB 

 
*Note:  To change from 114dB to 104dB, adjust the cal pot  R1

Содержание MK:440

Страница 1: ... Noise Microphone Page 1 of 13 Installation User Guide MK 440 Environmental Noise Microphone Revision E This manual the software to which it relates the program code and drawings are all Copyright Cirrus Research plc 2020 ...

Страница 2: ...s 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 Cirrus Research plc have been designed for use with the instrumentation manufactured by Cirrus Research plc No responsibility is accepted for damage caused by the use of any other parts or accessorie...

Страница 3: ...MK 440 available MK 440 approved for use in Class 1 Division 2 locations MK 440N which is not approved for use in hazardous locations The MK 440 is approved for use in Class 1 Division 2 environments as follows Class 1 Division 2 Groups C D T4 Class 1 Zone 2 AEx Ex ec llB T4 30 C Ta 60 C Each MK 440 unit will have its own output levels Please refer to the factory calibration setup information for ...

Страница 4: ... 10 50 C The current output is proportional to the A weighted noise level at low noise levels the output can be below 4mA 4 Conditions for use WARNING DO NOT CONNECT OR DISCONNECT WHEN ENERGIZED Never replace components unless power is disconnected or the area is free of ignitable concentrations The unit should be returned to Cirrus for repair any changes made to the unit will invalidate its appro...

Страница 5: ...MK 440 Environmental Noise Microphone Page 5 of 13 5 MK 440 Overview Bird Spike Backplate Windshield Preamp MK 440 enclosure lid NPT gland Captive lid Screw ...

Страница 6: ...l for integration to many process measurement and control systems where your own system loggers and software can provide an accurate representation of the live noise levels and also store data Your own interface system will need programming with a simple formula which is outlined on your Factory Configuration Information sheet For Example For a unit with a range of 64 to 134 dB the default setting...

Страница 7: ...rth conducting a noise survey or referring to measurement data from a recent noise survey to understand the noise profiles for the area Install the sensor at a location nearby to where the environmental noise is most likely to have an impact Legislation often specifies where measurements should be made for example at property boundaries or at a complainant s property Try to mount the unit away fro...

Страница 8: ... hazardous and hazardous locations as long as it is suitably rated Wherever possible the MK 440 should be wired outside of any potentially explosive atmosphere A single conductor must be used in each port The cross sectional area of the conductor must be between 0 2mm2 and 0 6mm2 The cable must have a temperature rating of at least 80 C and ideally be UL rated The power and current loop supply mus...

Страница 9: ...is shown below MK 440 24VDC POWER 24VDC LOOP 24V POWER 0V POWER LOOP OUT LOOP IN OV POWER A OV LOOP CURRENT MEASUREMENT 7 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 across the resistor of 10mV dB 7 1 Earth bonding The MK 440 has several earth bonding points it is essential t...

Страница 10: ...l expose the microphone allowing an acoustic calibrator to be placed over it A CR 514 CR 515 can be used to set an absolute reference point for the system The calibrator emits a 94dB tone the current output then needs to be measured to determine the level being measured by the device Turning the screw on the blue resistor marked CAL will adjust the current output You will need to refer to your con...

Страница 11: ...default setting if not specified Nominal Range DIP SW1 1 DIP SW1 2 DIP SW1 3 I _OUT mA DC Example Value at 9 4mA 64 134dBA ON OFF ON dB 10 x I 20 114dB 54 124dBA ON ON OFF dB 10 x I 10 104dB 44 114dBA OFF OFF ON dB 10 x I 94dB 34 104dBA OFF OFF ON dB 10 x I 10 84dB 24 94dBA OFF OFF OFF dB 10 x I 20 74dB Note To change from 114dB to 104dB adjust the cal pot R1 ...

Страница 12: ...quipment Description The following equipment manufactured after 30th May 2018 MK 440 Environmental Noise Microphone Along with standard accessories According to EMC Directives 89 336 EEC and 93 98 EEC meet the following standards EN 61000 6 3 2001 EMC Generic emission standard for residential commercial and light industrial environments EN 61000 6 1 2001 EMC Generic immunity standard for residenti...

Страница 13: ...rus 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 Yorkshire United Kingdom YO14 0PH Telephone 44 0 1723 891655 Fax 44 0 1723 891742 E mail sales cirrusresearch co uk Web Site www cirrusresearch co uk Germany Cirrus Research plc Deutschland Arabella C...

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