MK:440 Environmental Noise Microphone
Page 9 of 13
It is the
operator’s
responsibility to ensure cable routing, conduits and connection to the unit meets
with any local safety regulations.
It is advised to perform a calibration before placing the lid on the enclosure (see section 8),
adjusting the calibration potentiometer as necessary. If wall mounting kit BP:440 is being used it
should also be attached to the MK:440 before placing the lid on the enclosure.
A typical wiring diagram 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 the product is connected to a suitable
ground connection. Earthing points are illustrated below:
Note that the external and internal earths of the enclosure share an electrical connection, but the
lid does not. Both parts of the enclosure must be connected to a suitable ground connection.
