Laurel Electronics Laureate Rate Meter & Totalizer with Functions A+B, A-B, AxB, A_B, A_B-1 User Manual
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LAUREL
ELECTRONICS INC., 3183-G Airway Ave., Costa Mesa, CA 92626, USA • Tel 714-434-6131 • www.laurels.com 4
Application Examples
Controlling the Mixing Ratio of Two Fluids
Displaying and alarming the input flow rate ratio of two fluids
(gas or liquid) allows these to be mixed in a predetermined
ratio in continuous processes. The sensing element is normally
a turbine flowmeter, which outputs pulses at a frequency
proportional to flow rate. The A/B ratio can also be displayed
for totalized rate (or delivered volume).
Comparing Fluid Inflow & Outflow
The ratio of the inflow and outflow rates of a tank is a measure
of the relative filling or emptying rate. The same meter can also
be programmed to display the net inflow or outflow rate in flow
units, or to display totalized inflow our outflow in volume units.
Any of these parameters can be alarmed using the dual relay
board and be transmitted via 4-20 mA, RS-232 or RS-485.
Controlling Coating Thickness on a Film
In this application, Channel A measures the rate at which a
coating material is applied, as measured by a flow meter, while
Channel B measures the speed of the film based on pulses
from a proximity switch. Displaying and alarming the A/B ratio
assures that an even thickness of coating material is applied as
the speed of the film is varies.
Synchronizing Two Conveyor Lines
The dual-channel Laureate counter can measure the speed of
conveyor lines by using the output of proximity switches which
sense gear teeth or spokes of rotating drive wheels. Displaying
the speed ratio of two lines allows line speeds to be adjusted
so that material arrives at work stations when needed.
Measuring Draw for Elongation
Draw (Ch A / Ch B - 1) can be used to display the elongation of
films compressed between rollers, the shrinkage films, and the
RPM difference of rollers whose speed is varied to maintain
tension. The six-digit resolution of the Laureate dual channel
counter / rate meter is ideal for comparison of rates that are
close to each other.