2 Expansion Options
Page 12 Mk8 MM Expansion Features Installation and Set-Up Guide 04.09.2016
Exp
Option
Default Range Description
25 25 Sudden Pressure Drop Control Point Increase
If a sudden pressure drop is detected, the water level control point will
increase to the percentage of the control point set. Once the steam pressure
increases to the reset offset value from the required pressure setpoint, the
control point will return to the commissioned value. See expansion options
24 and 26.
0 Disabled
1 – 75 1% - 75%
26 10 Sudden Pressure Drop Reset Offset
If the pressure drops by the value set in expansion option 24 over 3
seconds to a pressure below this reset offset from the required pressure
setpoint, then a sudden pressure drop condition is detected and the control
point will increase by a percentage set in expansion option 25.
0 Disabled
1 – 100 PSI or 0.1 bar or 0.01 bar for low pressure sensor (depends on load
detector set in option 1 and metric/imperial units set in parameter 40)
27 20 Probe Mismatch Threshold
The probe mismatch threshold is a percentage of the first low. If the probes
and/or external level sensors read a difference in the level greater than this
value set for 30 seconds, then a probe mismatch alarm will occur.
5 – 100 5% - 100%
28 3 Capacitance Probe Still Water Threshold
This threshold set is the distance between the high peak and low peak of
the water wave signature. If the capacitance probes detect a reading
between the high peak and low peak which is less than this value for 30
seconds while the burner is firing, a capacitance probe still water alarm will
occur.
0 Disabled
1 – 100 1 – 100mm or 0.0 – 3.9” (see parameter 40)
29 10 Capacitance Probe Filter Time
The filter time is the rolling time period over which the capacitance probes
take the water level reading. When a moving water level is detected this
time period reduces in proportion linearly to the movement.
1 – 30 Seconds
30 0 External Level Sensor Scaling
If an external level sensor is set in expansion option 4, then the 4-20mA
signal will need be scaled for the length of the sensor.
0 Disabled
1 – 20000 0.01 – 200.00mm/mA or 0.01 – 200.00”/mA (see parameter 40)
31 10 External Level Sensor Filter Time
The filter time is the rolling time period over which the external level sensor
takes the water level reading. When a moving water level is detected this
time period reduces in proportion linearly to the movement.
1 – 30 Seconds
32 3 Wave Signature Average Level
The wave signature average level is set as percentage of the wave
signature height of the water level.
0 – 10 0 – 100% (value 3 = 30%)
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