Standard Counter

• Available in three digit heights: 0.56" for panel mounting, 1.0" (Mighty-1) or 5.0" (Mighty-5) for long-distance indoor/outdoor viewing.
• Square root readout from analog output of differential pressure flow transducers
• 0-1 mA, 4-20 mA, 0-10 V inputs, or special factory scaling.
• 6-digit resolution.
• Field scalable for direct readout in engineering units.
• Isolated 5, 10, or 24 Vdc excitation output to power sensors.
• Selectable "count by" of 10 or 100 with rounding.
• 25/s update rate.
• Peak value display.
• Green or red LED display.
• Choice of isolated plug-in options for control and computer interface:
  dual relays, 4-20 mA & 0-10 V analog output, RS-232/485 serial I/O, low voltage AC & DC power.
• 1/8 DIN case environmentally sealed to NEMA-4X from front panel.
• 1/8 DIN version certified to UL 3101-1, CAN/CSA-C22.2, EN 61010-1 (CE Mark).

Extended Counter

All capabilities of the Standard Counter, plus:

• Custom curve linearization.
• Total based on rate and time.
• Batch control based on rate and total.
• Display of process time based on rate input.

Description

Standard Counter Version

Rate with Square Root Extraction

A Micro Series 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.

• Batch Control with Linearized Total

The Micro 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.

Principles of V-to-F Operation

The V-to-F signal conditioner board converts the full-scale 0-1 mA, 4-20 mA or 0-10 V analog signal to a frequency of 10-110 kHz. This frequency is determined by measuring period over a selected gate time (from 10 ms to 200 s) and taking the inverse of period. Selecting a short gate time provides a much higher update rate than conventional counting-type frequency meters. At the lowest frequency of 10 kHz and the minimum gate time of 10 ms, the meter is capable of 25 updates per second.

Scaling to rate in engineering units and totalizing are done mathematically. Totals are stored in nonvolatile memory in case of power loss.

High Resolution Display

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 a selectable gate time for rate measurement, an adaptive filter can reduce variations due to noise while rapidly responding to actual changes in signal level.

Built-in Flexibility

Optional plug-in analog output, dual-relay controller, and RS-232/485 serial communications boards can upgrade Micro and Mighty Series meters from a stand-alone monitor to system interface and control. The analog 4-20 mA or 0-10 V analog output will be linearized to the reading, which may be rate or total.

Micro Series meters can be powered from 95-240 Vac ±10% and 95-370 Vdc, or optionally from 12-34 Vac and 10-48 Vdc. Any setup functions and front panel keys may be locked out for simplified usage and security. The popular 1/8 DIN version with 0.56" high digits is environmentally sealed to NEMA-4X (IP65) from the front when panel mounted, and is available with red or green LEDs.

0-1 mA, 4-20 mA, 0-10 V
Consult factory

0.003% R/°C
0.001 FS/°C

Flow from a Differential Pressure Transducer

Up- or Down-Counting Batch Controller

Volume of an Irregularly-Shaped Tank

Process Time from an Analog Rate Signal