The Laureate Model VF is a UL-listed, programmable 6-digit panel meter which can display rate or totalized rate from transducers with a 4-20 mA, 0-1 mA or 0-10V output. Readings can be scaled to engineering units such as gallons per minute or gallons. Square root extraction is standard for use with differential pressure flow sensors and is applicable to rate or total.

The Laureate VF converts the analog signal to a frequency, which is then converted to rate. It provides exceptional accuracy of ±0.02% of full scale at 25 readings per second. Such fast response is ideal for alarm and control applications. Scaling to engineering units, such as GPM, and totalizing are done mathematically. Totals are stored in nonvolatile memory in case of power loss.

The display of rate or total may be scaled to ±999,999. The two least-significant digits may be set to display zero with rounding or be active digits. In addition to the user-selectable gate time for rate measurement, an adaptive filter can reduce variations due to noise while rapidly responding to actual changes in signal level.

In addition to flow meter applications, the Laureate VF is also suitable for a wide range of non-flow applications which require integration of an analog signal. For example, the unit can display kilowatt-hours from the 0-1 mA signal of a watt meter.

The totalizing version also allows batch control, custom curve linearization to extend the range and accuracy of transducers, and display of time based on rate, such as the time it will take a conveyor to traverse a bake oven.

A built-in isolated 5, 10, or 24 Vdc excitation supply is standard to power transducers. Options include dual relays for control or alarm, isolated 4-20 mA and 0-10V analog outputs, and an RS232 or RS485 port for data communications with a host computer or PLC. Modbus RS485 is fully supported.

The base price is $230 for rate only, $270 for rate or total. For more information and pricing of options, visit www.laurels.com/v-to-f.htm