Digital Panel Meters for Flow Rate, Flow Total, Batch Control

Product Selection Guide
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6-digit scalable counter with dual pulse / AC inputs from turbine flow meters. Allows square root extraction, custom curve linearization, and display of rate or total. Dual channels allow addition or subtraction of two flow rates for net flow, or the ratio of two flow rates to control mixing operations. Includes isolated transducer excitation supply. Fast read rates with peak hold. Optional analog output, relays, and data I/O. Six 0.56" (14.2 mm) high digits, 1/8 DIN case.

Flow Rate Meter

5-digit DC digital panel meter for analog signals such as 0-10 mA, 4-20 mA or 0-10 V. Programmable zero and span using three methods:scale and offset, two-points, or system-level calibration using actual transducer signals for known readings. Fast read rates with peak hold. An Extended processor version allows custom curve linearization and rate from successive analog readings. Fast read rates with peak hold. Includes isolated transducer excitation supply. Optional analog output, relays, and data I/O. Five 0.56" (14.2 mm) high digits, 1/8 DIN case.

Process Digital Panel Meter

This digital panel meter totalizes 0-1 mA, 4-20 mA or 0-10 V analog signals, for example to display totalized volume from the 4-20 mA analog signal of a flow meter transducer. Capabilities include zero and span adjustment, square root extraction from differential flow meter signals, custom curve linearization, and elapsed time based on rate (for example, the time it will take to fill a tank at the current flow rate. Optional data I/O and relays for alarm or control. Six 0.56" (14.2 mm) high digits, 1/8 DIN case.

Process Totalizer Digital Panel Meter

The Extended Laureate with FR dual-channel signal conditioner accepts pulses from turbine flow meters and other transducers with a pulse output. Jumper selections provide optimum operation for different flow sensor types and noise conditions. Batch control is provided by three relays. Six 0.56" (14.2 mm) high digits, 1/8 DIN case.

Laurel Pulse Input Batch Controller

A high-sensitivity 5-digit meter for use with load cells, strain gauges and microvolt input signals where high accuracy and stability are required. Load cell operation allows 4- or 6-wire hookup and display in engineering units, such as lbs, kg or psi. Built-in excitation for up to four 350-ohm load cells in parallel.

Laurel Analog Input Batch Controller

Equipped with a DC or load cell signal conditioner, this Laureate offers special firmware for scale / weighing applications: two tare functions; count by 1, 2, 5, 10, 20, 50 or 100; auto-zero function; setpoint offset, and dummy right-hand zero for display to 999,990. Built-in excitation for up to four 350-ohm load cells in parallel.

Loop-Powered Digital Panel Meter, Model 88-PRO

4- and 6-digit large-digit displays with a digit height of 2.2" (57 mm), 4" (102 mm), 6" (150 mm), or 8" (200 mm) for long viewing distances. Digitally scaled display for pulse input rates to 50 kHz. Optional dual 5A relays, analog output, and serial data output. Choice of display brightness and cases for indoor or outdoor mounting.

Magna Series Large Digit Digital Panel Meters and Remote Displays

Factory calibrated for five jumper selectable resistance ranges from 20Ω to 200 KΩ. Exceptional accuracy of ±0.01% of full scale. In the 20-ohm range, resolution is 1 milliohm, making the meter suitable for contact resistance measurements. 2, 3 or 4 wire connection to eliminate lead resistance effects.

Microminiature Digital Process Meter, Model M-35

All capabilities of the Laureate process meter, plus custom curve linearization. Setup is easy using an external PC and linearizing software furnished by Laurel. For example, display liquid volume in irregularly shaped tanks, use with non-linear transducers, or extend the working range of nominally linear transducers.

1/8 DIN Bar Graph Process Display, BAR Series

Scalable process meter powered by 4-20 mA, 10-50 mA or 1-5 mA current loop, with no need for external power. 12.7 mm (0.50") high LCD digits, 1/8 DIN case.

Large Bar Graph Process Display, Model PRO-BAR
Transducers for flow or batch control may put out a pulsed / AC signal or a conditioned analog signal such as 0-1 mA, 4-20 mA or 0-10 V. Laurel offers digital panel meters for all signal types normally associated with flow meters, with scaling to display in engineering units, such as Gallons, GPM, or liters/sec. Flow meter capabilities include square root extraction for use with differential pressure flow meters, custom curve linearization, rate from successive readings, totalizing from rate signals, analog outputs tied to the reading, and relay outputs for alarm or control. Flow rate meter
Batch control (or batching control) is used for repeatitive fill operations. Laurel batch controllers are available for flow meter signals with a pulse output or an analog output (0-1 mA, 4-20 mA or 0-10 V). Batch control is provided by two relays, one of which can serve as a pre-warn relay to slow down filling near the setpoint. The display can be set to show the current batch total, grand total, number of batches, or flow rate. All displayed values are scaled to engineering units of volume or flow. Batch control block diagram
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