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2.3 Operating Functions
2.3.1 Resettable Total
The display toggles between Rate and Total displays when the RATE/TOTAL key is pressed.
Pressing the RESET key and holding for a period of 3 seconds while the Total is displayed on
the LCD will cause the Total to reset to zero.
2.3.2 Accumulated Total
The Accumulated Total is displayed momentarily whenever the ACC.TOTAL key is pressed,
holding the key will hold the Accumulated Total display. If permanent display of the
Accumulated Total is required, this can be achieved by pressing and holding the ACC.TOTAL
key for a period of 10 seconds. Once this is done the Accumulated Total display will latch every
time the ACC.TOTAL key is pressed; to revert the Accumulated Total display to a momentary
display hold the ACC.TOTAL key again for 10 seconds.
The Accumulated Total display can only be reset by entering into the Programming Mode
and progressing to the Accumulated Total Reset function in the Advanced Menu. Protection of
the Accumulated Total reset can be achieved by PIN protecting the Programming Mode.
2.3.3 Rate Display
The Flow Rate Display is toggled by pressing the RATE/TOTAL key; Rate display remains
active until the RATE/TOTAL key is pressed again. The update frequency of the Rate display is
influenced by two parameters; the update frequency of the display (1Hz on battery power, 4Hz
on external DC or loop power), and the Rate Calculation Pulses parameter. If the update
frequency of the Rate Display is too slow consider reducing the number of pulses for the rate
calculation (see section 5.10). Conversely if it is required to stabilise an erratic Rate Display,
increasing the Rate Calculation Pulses parameter will achieve this.
Other parameters which influence the Rate Display are the Rate Damping, and Low
Frequency Cut-Off settings. Rate Damping will smooth out rapid changes in the flow rate in
order to maintain a steady display, however in systems where fast changes in the flowrate
must be displayed the Rate Damping parameter should be minimised.
The minimum input frequency requirement for a Rate Display is 0.2Hz with the factory
settings; this can be reduced to 0.1Hz by adjusting the Low Frequency Cut-off parameter. Note
that Totalisation is not effected by the Low Frequency Cut-off parameter.
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General