Liquid Controls HML110 IOM - Manual (Page 24)

HML 110
24
110_EN_LC_5_3_6X.doc
Secondly a variation form 10% to 100%, exceeding the acceleration threshold and then immediately
sent to the output. In reality there is always a minimum time between the measure acquisition and
the outputs update.
(POS. 3.3) Peak cut off threshold [Peak thr=% XXX]
Anomalous signal peak cut off threshold set. This parameter allows for setting the maximum value of
deviation of the measured sample in comparison to the average. If a successive value is higher than
the set limit, than such a value is “cut” to the limiting value. This function is used to make the meter
less sensitive to big perturbations of the flow rate measure. This may happen when there are solids
suspended in the liquid in contact with the electrodes resulting in higher electrical noise. The
permitted values of this function range from 0 to 125 % in reference to the full scale value. If this
parameter is set to zero the peak detection function is disabled and any subsequent measured sample
will be accepted and processed by the converter.
(POS. 3.7) Automatic scale change enable
[Autorange=ON/OFF]
Enables/disables the automatic change of scale. The meter may have two different working ranges in
order to suit variable process conditions. In order to get the best results out of this function it is
important that range N.2 is greater than N.1. When the flow rate increases and reaches the 100% of
the scale N.1, the meter automatically switches to scale N.2. When the flow rate subsequently
decreases to an equivalent value on scale N.2 (equal to the 90% of full scale N.1), scale N.1 will
assume the active scale. Allowed values for this parameter: ON / OFF.
(POS. 3.8) Energy saving enable
[E.saving=ON/OFF]
Automatic energy saving function enables. This function is used when the instrument is powered by a
battery or solar cells, allowing an energy saving up the 60-80%. The energy saving function controls
the powering cycles ratio of the coils while the measuring cycling remain unaffected. When the
energy saving function is enabled and the flow rate is stable the number of “off” cycles is greater
than the “on” cycles, reducing the average power consumption. If the flow rate suddenly changes,
the meter switches to a higher number of measuring cycles, achieving a higher response time. Once
the flow rate resumes stability the number of powering cycles is reduced. If the flow rate varies below
the “acceleration threshold” percentage value, the meter assumes the “off” cycles. When the flow
rate exceeds such a threshold, the meter increases the measuring cycles. The speed at which the
meter will switch between the increased and reduced powering cycles are different. From a constant
to a variable flow rate is a very fast process, while from variable to a stable flow rate is much slower.
The allowed values for this parameter: ON/OFF. N.B.: to optimize this function, a value for the
acceleration threshold between 10 – 15 is recommended
MENU 4 - ALARMS
(POS. 4.5) Current output value in case of failure [mA v.fault =% XXX]
Setting of the value of the 0/4...20 mA current output in one or more of the following cases; empty
pipe , ADC error, and coils interrupted.
The permitted range is from 0 to 120% of the 0 - 20 mA scales, 120% corresponds to 24 mA and
does not depend on the selected range (0…20 / 4…20 mA).