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Rate,
analog square root, batch control, time based on rate
from 0-1 mA, 4-20 mA or 0-10 V signals.
Standard
Counter Version
Rate with
Square Root Extraction
A Laureate™ meter with the
Standard counter main board and a voltage-to-frequency
(V-to-F) signal conditioner board (shown to right) is able
to accurately extract the square root of analog signals. The
display is a full six digits. The three standard input
ranges are 0-1 mA, 4-20 mA and 0-10 V. Special input ranges
are available from the factory.
One application
of the Standard V-to-F meter is to accurately display flow
rate in engineering units, such as gallons per minute, from
the 4-20 mA signal of a flow transducer with a linear or
squared output.
Extended
Counter Version
Batch Control
with Linearized Total
The Laureate V-to-F meter with the Extended counter main
board can also totalize the linearized flow rate derived
from the analog rate signal, count up to a preset value, or
down to zero from a preset value for batch control. The
analog input may or may not require linearization. In
addition to rate and total, the grand total of the batches
or the number of batches can also be displayed by pressing a
front panel key.
Use of the
Extended V-to-F meter as an up or down-counting batch
controller requires the dual-relay output board option. One
of the relays is dedicated to ON/OFF batch control. The
other relay is available to slow down rate near the setpoint
or to provide another alarm or control function based on
rate or total.
One application
of display of rate plus total is to read out kilowatts and
kilowatt-hours based on 0-1 mA from a watt transducer.
Custom Curve
Linearization
The relationship
between the analog input and the value to be displayed can
have a linear, square root, or custom curve relationship.
For custom curve linearization, up to 240 data points can be
input into a spreadsheet or text file by the user. The
computer then calculates spline-fit segments, which are
downloaded into the meter via RS-232. Custom-linearized
rates can be totalized and be used for batch control.
Like the
Extended analog DC panel meter, the Extended V-to-F meter
can linearize and display analog inputs based on a custom
curve unrelated to flow, for instance to read out the volume
of an irregularly shaped tank based on level or pressure, or
to linearize a nonlinear transducer.
Time Based on
Rate
The Extended V-to-F meter can display a time inversely
proportional to measured rate, such as the time that it will
take a conveyor to traverse an oven. As the rate of the
conveyor is increased, the displayed baking time will be
decreased.
PLEASE SEE TECHNICAL INFORMATION - PDF FOR COMPLETE
INFORMATION |