3 Water Level Control
Page 52 Mk8 MM Expansion Features Installation and Set-Up Guide 04.09.2016
3.6 External Level Sensor
An external level sensor can be used with one or two capacitance probes for water level detection on
the Mk8 MM. This sensor will give an analogue signal to the MM to indicate level across a 4-20mA
input range. The water levels commissioned for the external level sensor are the same for the
capacitance probes which are HIGH, CONTROL POINT, 1
st
LOW, 2
nd
LOW and END OF PROBE.
The table below shows the terminals allocated on the MM for an external level sensor.
Terminal Description
EX- Common for terminal EX+
EX+ Current input, 4-20mA for external water level probe (or fuel flow feedback)
Note: The external level sensor cannot be used with 4-20mA input for the fuel flow feedback, see
option 57.
The table below shows the expansion options to be set to for using external level sensor on the MM.
Expansion Option Description Setting
1 Water level control function 1
4 External level sensor 1
30 External level sensor scaling As required
31 External level sensor filter time As required
Note: External level sensor can only be used in conjunction with one capacitance probe at minimum;
please see section 3.3 Ways of Level Sensing for more information.
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