Yokogawa Y851 - Green LED 8 to 28 volts AC, Basic Counter

The 800Plus Universal Digital Meter is a versatile, cost effective solution to a wide variety of monitoring and control applications. Frequency Rate Total Timer Basic Counter Frequency, rate, total (up or down), period (2 channels simultaneously), time interval A to B, square root of rate. Rate, square root of rate (differential pressure or target type flow meters). Position or length from encoders. Accepts differential or single-ended inputs. 1x, 2x, or 4x inputs. Z channel inputs. Type: FR, VF, QD Extended Counter Basic counter plus rate & total simultaneously, linearize non-linear inputs, ratio, draw, arithmetic function(A * B, A / B, A + B, A - B), phase angle, stop watch, up/down counting, batch counting. Basic counter plus rate and total simultaneously, linearize non-linear inputs, batch counting, 1 / rate (time). Extended counter not required for QD applications.

Universal Digital Meter for Thermocouples and RTDs Process Signals Strain Gauge and Load Cell Universal Digital Counter Frequency and Period Rate and Total Integration and Square Root Quadrature and more.

Inputs to the FR dual-channel signal conditioner

Can be proximity switches with PNP or NPN output, TTL or CMOS logic, magnetic pickups, contact closures, low-level outputs from turbine flow meters down to 12 mV, and high-level AC line inputs up to 250 Vac. A built-in isolated 5, 10, or 24 Vdc excitation supply can power proximity switches and other sensors, thus eliminating the need for an external power supply.

Designed for system use

Optional plug-in boards include Ethernet and other serial communication boards, dual or quad relay boards, and an isolated analog output board. Y800 Plus counters may be powered from 85-264 Vac or optionally from 12- 32 Vac or 10-48 Vdc. The display is available with red or green LEDs. The 1/8 DIN case meets NEMA 4X (IP65) specifications from the front when panel mounted. Any setup functions and front panel keys can be locked out for simplified usage and security. A built-in isolated 5, 10, or 24 Vdc excitation supply can power transducers and eliminate the need for an external power supply. All power and signal connections are via UL / VDE / CSA rated screw clamp plugs.

Dual-channel frequency, rate & period meter

The Y800Plus is a basic operating mode of the Y800 Plus counter with the FR signal conditioner board. It can display frequency from 0.005 Hz to 1 MHz, rate in engineering units, and period (inverse of frequency). The normal displayed value can range up to 999,999 counts. Above that level, the display will flash and go into four-digit XXXXEX scientific notation. Each channel (A or B) may be independently scaled for frequency, rate or period. The displayed channel is selected via a front panel push- button. Examples of applications are the accurate display of AC line frequency, RPM, speed from proximity switch inputs, and flow from turbine flow meter inputs.

Fast, high resolution measurements

The Y800 Plus counter determines frequency by timing an integral number of periods over a specified gate time, and then taking the inverse of period. Rate is obtained by multiplying the input by a scale factor. The inverse period approach allows greater accuracy and faster update times than conventional meters which count signal pulses over a time interval. AC line frequency may be accurately measured to 50.0000 or 60.0000 Hz in a few line cycles. 1000 Hz signals may be measured to 0.01 Hz resolution at up to 25 readings per second. Fast response is ideal for alarm and control applications.

For noise reduction

A count by 10 or 100 feature with rounding is selectable. Variations in the displayed reading can also be reduced by selecting a longer gate time. An adaptive digital filter is selectable to reduce variations due to noise while rapidly responding to actual changes in the signal.

Rate and total simultaneously

One channel can display total while the other displays rate. The selection for either channel is via a front panel pushbutton. This mode is ideal for flow applications when the same signal is applied to both channels.

Custom curve linearization

Exceptionally accurate custom curve linearization allows linearization of the low end of turbine flowmeters. For setup, up to 180 data points can be input into a spreadsheet or text file by the user. The computer then calculates nonlinear segments, which are downloaded into the meter via RS-232. The Extended version allows linearized rates to be totalized.

Arithmetic functions

The Extended counter makes arithmetic functions available, namely A+B, A-B, AxB, A/B and A/B-1 (draw). For example, A+B allows two input flows to be summed for total flow, while A-B allows outflow to be subtracted from inflow for net flow. If transducers with a frequency output are used, AxB allows horsepower to be displayed based measured torque and RPM, or based on force and velocity. A/B can be used for the proper mixing of ingredients, while A/B-1 (draw) is used to compare rates for stretching or tensioning.

Application Examples:

AC Line Frequency
The Y800 Plus will accept line voltages up to 250 Vac and display line frequency to 6-digit accuracy (50.0000 or 60.0000) in a few line cycles. Fast low frequency response is achieved by timing the period and taking its inverse.

RPM and Speed
The Y800 Plus can sense the low-level signals from magnetic pickups or the NPN or PNP transistor output of active sensors. These can be powered directly by the meter. Display in RPM or units of speed is achieved by mathematically scaling the meter.

Flow Rate and Simultaneous Total
The Y800 Plus is compatible with all flow meters which generate pulses at a frequency proportional to flow rate. The Extended version can display scaled rate or total for the same input at the push of a button, and alarm from both the rate and total. The Extended version can also linearize flow transducers so as to extend their dynamic range.

AC Line Frequency
The Extended Y800 Plus offers A+B, A-B and A/B arithmetic functions. A+B allows two input flows to be summed for total flow, while A-B allows outflow to be subtracted from inflow for net flow. Flow ratios aid in the proper mixing of ingredients.

Custom Curve Linearization
The Extended Y800 Plus can linearize the output turbine flow meters, which tend to be nonlinear on the low end. Linearizing improves the dynamic range and accuracy of turbine flow meters.

System-level Capabilities
The Y800 Plus dual channel rate meter can independently scale, display and alarm two pulse input channels. All signal or alarm data can further be transmitted via RS-232 or RS-485, including peak readings and arithmetic combinations of the two rates. The displayed rates can also be transmitted as an isolated 4-20 mA or 0-10V analog output.