In the program mode, the high and low totals can be viewed or preset to any value by
P-54 and P-55 respectively.
The flow readings ( high and low total ) may be scaled down by factors of 10 ( P-52 )
to slow down the totalizer’s rate of fill and its decimal point ( P-53 ) positioned for the
resolution required. To change the scaling factor or decimal point location after
totaling has begun, record the high and low totals and reset the totalizer to zero.
The MultiRanger Plus can be programmed to ignore low head, i.e. flows for heads
less than that set in P-48 will not be accumulated in the totalizer. The low head cutoff
is measured in % of maximum head ( P-45 ).
Further to alarm and pump functions, relays may be programmed to act as a
momentary contact closure for a remote totalizer, flow sampler or time sampler ( refer
to Application \ Relays ). The duration of a momentary contact closure is 200 msec for
which the corresponding relay status LED will flash. As a remote totalizer relay, the
contact is closed each time the displayed total is increased by the amount entered into
P-56. As a flow sampler relay, the contact is closed each time the volume of liquid as
set by P-57 and P-58 is pumped. As a time sampler relay, the contact is closed at the
rate of the time period.
The mA output responds to the head or flow ( P-50 ). In the event of fail-safe due to
loss of echo, the mA output will respond as programmed by P-6 and P-74.
When programming the MultiRanger Plus for the OCM function, the empty distance to
transducer ( P-3 ) may be considered and entered as the distance from the transducer
face to the 0 head or no flow reference level. If this measurement is not easily
obtained, P-3 can be estimated and corrected via P-47. This is referred to as the Auto
Zero calibration and requires the MultiRanger Plus to compare a physical
measurement ( from wall gauge, dipstick or stilling well ) to the ultrasonic
measurement via P-47. Refer to OCM Auto Zero Example.
It should also be noted that when operating in the OCM function: percent display,
volume conversion ( P-34 ) and convert display ( P-37 ) are inoperative. Empty
calibration ( P-61 ) must be clear, i.e. 4 hyphens in the display.
PL-443 6 – 29
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