MK:440 Environmental Noise Microphone
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2
Product Description
The sound monitoring device (MK:440) is suitable for use in Class 1 Division 2 hazardous locations
when installed in accordance with these instructions. The device conforms to: IEC 60079-0 and IEC
60079-15 and is suitable for outdoor installation with a rating of IP54.
The MK:440 i
s supplied with a ½”
NPT connection that conduit may be connected to
or a 1/2” gland
.
3
Technical information
Parameter
Value
Unit
Min.
Typical
Max.
POWER voltage
12
24
27
VDC
LOOPIN voltage
12
24
30
VDC
Current
20
50
mA
Current loop output*
4
-
20
mA
Current loop impedance
-
-
400
Ω
Captive lid screw tightening torque
3
4
Nm
Terminal block tightening torque (J7 & J8)
0.5
0.6
Nm
Weight
2.6
kg
Dimensions(L,W,H)
75,125,480
mm
Operating Temperature
-10
50
°C
*The current output is proportional to the A-weighted noise level, at low noise levels the output can
be below 4mA.
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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 approval.
A portion of the enclosure is non-conducting and, under certain extreme conditions, may generate
an ignition-capable level of electrostatic charges. The user shall ensure that the equipment is not
installed in a location where it may be subjected to external conditions (such as high-pressure
steam) which might cause a build-up of electrostatic charges on non-conducting surfaces.
Additionally, cleaning of the equipment should be done only with a damp cloth.
The user shall ensure that the equipment is not installed in a location where it is continuously
exposed to ultraviolet light.