Micron Meters- 6-Digit Process Meter & Flow Totalizer

Standard Counter

6-digit display of rate or total, selectable via front panel key
0-1 mA, 4-20 mA, 0-10V inputs, or special factory scaling
Exceptional accuracy: ±0.005% of span ±1 count
Square root display from analog output of differential pressure flow transducers
Totalizing based on rate and time (integrating totalizer)
Field scalable for direct readout in engineering units
Selectable "count by" of 10 or 100 with rounding
Update rate selectable to 25/sec
Peak or valley display
Green or red display
Universal AC power, 85-264 Vac
Isolated 5, 10 or 24 Vdc excitation supply to power sensors.
NEMA 4X, 1/8 DIN case
Certified to UL 61010C-1 (UL mark), EN 61010-1 (CE mark), and RoHS.

Extended Counter
All capabilities of Standard Counter, plus:

Batch control based on rate and total
Display of process time based on rate
Custom curve linearization

Options

Low voltage power: 10-48 Vdc or 12-30 Vac
Dual or quad relays: Form C contact or Form A solid state
Analog output: Isolated, 4-20 mA, 0-20 mA, 0-10V, -10 to +10V
Serial communications: RS232, RS485, Modbus RS485, USB, USB-to-RS485 converter

Description

Standard Counter Version

Six-digit display of rate or total at the push of a front panel key. A Micron with the Standard counter main board and a VF voltage-to-frequency signal conditioner board can be scaled to display rate or totalized rate to six digits for 0-1 mA, 4-20 mA or 0-10V analog process signals. Special input ranges are available from the factory. For example, the display can be scaled to show flow rate in gallons/minute or liters/sec, or to show volume in gallons or liters from the 0-10V output of a flow transducer. Or the display can be scaled to display power consumption in kilowatts or total utilized energy in kilowatt-hours based on the 0-1 mA output of a watt transducer.
Square root extraction is selectable) and can be applied to rate or total. This makes the VF Micron ideal for use with differential pressure flow meters, which have a squared output. Totalized volume is based on linearized rate.
Accuracy is one of the highest for any digital panel meter: ±0.005% of span ±1 count.

Extended Counter Version

Batch control based on linearized total. A Micron VF meter with the Extended counter main board can totalize linearized flow from an analog rate signal, and also count up to a preset value, or count down to zero from a preset value for batch control. Operation as a batch controller requires the dual or quad 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.

Custom Curve Linearization. For custom curve linearization, up to 180 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. The Extended VF meter can linearize and display analog inputs based on a custom curve, for instance to read out the volume of an irregularly shaped tank based on level or pressure, or to linearize a nonlinear transducer. Custom-linearized rates can also be totalized and be used for batch control.

Time Based on Rate. The Extended VF 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 is 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 kHz to 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. Noise in rate readings can be reduced by selecting a longer gate time. In addition, an adaptive digital filter can reduce variations due to noise while rapidly responding to actual changes in signal level.

Hardware Features

Optional plug-in isolated analog output, dual or quad setpoint controller and communication board board options can upgrade the Micron VF Analog Input Flow Rate Meter & Totalizer from a stand-alone monitor to system interface and control. The 1/8 DIN case of Micron meters and counters meets NEMA 4X (IP-65) standards from the front for high pressure wash-down when panel mounted.

SPECIFICATIONS

Display
Readout Color Range Indicators	6 digits, 7-segment, 14.2 mm (.56") Red or green LED -999999 to +999999 Four LED lamps
Inputs
Standard signal levels Other signal levels	0-1 mA, 4-20 mA, 0-10V Consult factory
Conversion
Frequency Technique Update Rate Gate Time	Inverse period Gate time + 30 ms (max) Selectable 10 ms to 199.99 s
Accuracy
Span Tempco Zero Tempco Accuracy at 25°C	±0.0025% FS/°C ±0.0005% FS/°C ±0.005% FS ±1 count
Power
Voltage, standard Voltage, optional Frequency Power Isolation	85-264 Vac or 90-300 Vdc (DC operation not UL approved) 12-30 Vac or 10-48 Vdc DC or 47-63 Hz 250V rms working, 2.3 kV rms per 1 min test
Excitation Output (standard)
5 Vdc 10 Vdc 24 Vdc Output isolation	5 Vdc ±5%, 100 mA 10 Vdc ±5%, 120 mA 24 Vdc ±5%, 50 mA 50 Vdc to meter ground
Analog Output (optional)
Output levels Current compliance Voltage compliance Scaling Resolution Isolation	4-20 mA, 0-20 mA, 0-10V, -10 to +10V (jumper selectable) 2 mA at 10V ( > 5 kOhm load) 12V at 20 mA ( < 600 Ohm load) Zero and full scale adjustable from -99999 to +99999 16 bits (0.0015% of full scale) 250V rms working, 2.3 kV rms per 1 min test
Dual or Quad Contact Relay Outputs (optional)
Relay Type Load Rating Isolation	Form C, SPDT 8A at 250 Vac or 24 Vdc 250V rms working, 2.3 kV rms per 1 min test
Dual or Quad Solid State Relay Outputs (optional)
Relay Type Load Rating Isolation	Form A, SPST, normally open 130 mA at 140 Vac or 180 Vdc 250V rms working, 2.3 kV rms per 1 min test
Serial Data I/O (optional)
Board Selections Protocols Data Rates Digital Addresses Isolation	RS232, RS485, Modbus RS485, USB, USB-to-RS485 converter Modbus RTU, Modbus ASCII, simpler Micron ASCII 300 to 19200 bps 247 (Modbus), 31 (Micron ASCII), 250V rms working, 2.3 kV rms per 1 min test
Environmental
Operating Temp. Storage Temp. Relative Humidity Protection	0°C to 60°C -40°C to 85°C 95% at 40°C, non-condensing NEMA-4X (IP-65) when panel mounted
Electrical Connections

Application Examples
Flow from a Differential Pressure Transducer
	An ideal application for the Standard Micron VF meter: readout of flow based on the 4-20 mA analog signal from a differential pressure transducer. Options include dual relays for alarm or control, isolated analog output to turn the meter into a transmitter, and RS-232/485 data communications.
Up- or Down-Counting Batch Controller
	An ideal application for the Extended Micron VF meter: up- or down-counting batch controller. The dual-relay card is required. One relay is dedicated to batch control, the other relay is available to alarm the rate or total. The signal input can be linear or nonlinear. The display can be toggled between rate and total.
Volume of an Irregularly-Shaped Tank
	The Extended Micron VF meter can linearize analog signals for display and alarm using custom curve linearization with multiple nonlinear segments. As illustrated, tank level is measured by an ultrasound detector, which transmits a 4-20 mA signal. This signal is then converted to a highly accurate volume reading. The linearized rate readings can also be totalized.
Process Time from an Analog Rate Signal
	A unique application of the Extended Micron VF meter: displaying process time based on the 4-20 mA or 0-10 V signal from a rate meter. In the above example, a tachometer transmits the speed of a conveyer belt through an oven. The meter displays baking time in the oven using the mathematical relationship time = distance / speed.