Laureate Counter Time Controllers | Phase Angle & Duty Cycle Meter

Laurel Electronics provides digital panel meters / controllers, totalizers, counters, loop-powered meters, temperature meters, for all types of transducers or process indication & control.

Laureate™ A/B Ratio & A/B-1 Draw Meters
With arithmetic functions applicable to rate or total

Extended Counter
A/B, A/B-1 (draw), A+B, A-B, AxB arithmetic functions applied to Channels A & B.	Applicable to rate or total.
Frequencies from 0.005 Hz to 1 MHz.	Independent scaling for each channel.
Inputs from NPN or PNP proximity switches, contact closures, digital logic, magnetic pickups down to 12 mV, or AC inputs up to 250 Vac.	Update rates to 25/s.
Selectable "count by" of 10 or 100 with rounding.	isolated 5, 10 or 24 Vdc excitation supply to power sensors.
Green or red 6-digit LED display	NEMA 4X, 1/8 DIN case
Dual relay option	Analog output option
Serial communication options	Low voltage AC & DC power
Safety certified to UL 61010C-1 (UL mark).	EM certified to EN 61010-1 (CE mark).
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Description

The A/B ratio and A/B-1 draw meters are selectable operating modes of the Laureate with Extended counter main board and FR dual-channel signal conditioner board.

Ratio can be used to compare flow rates in two channels, the RPM of rollers or gears, or the speed of moving machinery, such as conveyor belts. Ratio can also be applied to scaled totals to compare two batches to be mixed. In this application, one meter is used to monitor the ratio of flow rates, and a second meter to monitor the resulting batch totals.
Draw is obtained by subtracting 1 from ratio. Draw is often used to measure the elongation or shrinkage of material as it passes between rollers, or to monitor variation in the speed of rollers for tensioning.

Ratio and draw are similar, except that 1 is subtracted from ratio to obtain draw. The frequency of channels A and B is first measured and is then converted to rate in engineering units by multiplying it by the appropriate scale factor for that channel. Either rate can be displayed. The A/B ratio is then taken mathematically by the meter, and 1 is subtracted for draw. The result can be multiplied by a multiple or 10 from 0.0001 to 100000, and the decimal point can be set to display the result with the desired precision up to six digits.

Laurel Duel Channel Pulse Input Panel Meter

Fast, High Resolution Measurement
The Laureate counter determines frequency by timing an integral number of periods over a programmable gate time. The inverse period approach allows greater accuracy and faster update times than conventional meters which count signal pulses over a specified time interval. Channel A accepts pulses from 0.005 Hz to 1 MHz, while Channel B accepts pulses from 0.005 Hz to 250 kHz. At the minimum gate time of 10 ms, update rates can be up to 25/second. Such fast response is ideal for peak capture and for alarm and control applications. Variations in the displayed reading can be reduced by selecting a longer gate time. An adaptive filter can further reduce variations due to noise while rapidly responding to actual changes in the signal.
Universal Signal Conditioner
The Laureate dual-channel signal conditioner accepts inputs from 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. Jumper selections provide optimum operation for different sensor types and noise conditions. A built-in isolated 5, 10, or 24 Vdc excitation supply can power proximity switches and other sensors, and eliminate the need for an external power supply.
Other Features & Options
A built-in isolated 5, 10, or 24 Vdc excitation supply can power the transducer and eliminate the need for an external power supply. Plug-in isolated analog output, dual-setpoint controller, and RS-232/485 communications, boards can upgrade the Laureate ratio meter from stand-alone monitor to system interface and control. In particular, the meter can provide an isolated 4-20 mA output signal scaled to the display. The 1/8 DIN case of Laureate meters and counters meets NEMA 4X (IP-65) standards from the front for high pressure wash-down when panel mounted.
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Specifications
Inputs		Update Rate
Types	AC, pulses from NPN, PNP transistors, contact closures, magnetic pickups	Frequency Technique	Inverse period
Signal Ground	Common ground for channels A & B	Conversion Time	Gate time + 30 ms+ 0-2 signal periods
Channel A Frequency	0.005 Hz to 1 MHz	Gate Time	Selectable 10 ms to 199.99 s
Channel B Frequency	0.005 Hz to 250 kHz	Time Before Zero Output	Selectable 10 ms to 199.99 s
Minimum Signal	Nine ranges from (-12 to +12 mV) to (+1.25 to +2.1V).	Accuracy
Maximum Signal	250 Vac	Time Base	Crystal calibrated to ±2 ppm
Noise Filter	1 MHz, 30 kHz, 250 Hz (selectable)	Span Tempco	±1 ppm/°C (typ)
Contact Debounce	0, 3, 50 ms (selectable)	Long-term Drift	±5 ppm/year
Display		Excitation Output
Readout	6 LED digits, 7-segment, 14.2 mm (.56"), red or green LED.	5 Vdc	5 Vdc ±5%, 100 mA max
Zero Adjust	-999999 to +999999	10 Vdc	10 Vdc ±5%, 120 mA max
Range	-999999 to +999999, XXXXEX scientific notation beyond 999999	24 Vdc	24 Vdc ±5%, 50 mA max
Indicators	4 red LED lamps	Output isolation	50 Vdc to meter ground
Analog Output (optional)		Dual Contact Relay Outputs (optional)
Output levels	0-10V, 0-20 mA, 4-20 mA (jumper selectable)	Relay Type	Form C
Compliance	2 mA at 10V (5 kOhm load), 12V at 20 mA (0-60 ohm load)	Load Rating	120 mA at 130 Vac or 170 Vdc, 28 ohms series resistance.
Scaling	Zero and full scale adjustable from -99999 to +99999	Isolation	250V rms working, 2.3 kV rms per 1 min test
Resolution	12 bits (0.025% of full scale)
Isolation	250V rms working, 2.3 kV rms per 1 min test
Dual Solid State Relay Outputs (optional)		Serial Data I/O (optional)
Relay Type	SPST, normally open, Form A	Board Selections	RS232, RS485, Modbus RS485
Relay Type	SPST, normally open, Form A	Protocols	Modbus RTU, Modbus ASCII, simpler Laurel ASCII
Load Rating	120 mA at 130 Vac or 170 Vdc, 28 ohms series resistance	Data Rates	300 to 19200 bps
Load Rating	120 mA at 130 Vac or 170 Vdc, 28 ohms series resistance	Digital Addresses	247 (Modbus), 31 (Laurel ASCII),
Isolation	250V rms working, 2.3 kV rms per 1 min test	Isolation	250V rms working, 2.3 kV rms per 1 min test
Environmental		Signal Connections
Operating Temperature	0°C to 60°C
Storage Temperature	-40°C to 85°C
Relative Humidity	95% at 40°C, non-condensing
Protection	NEMA-4X (IP-65) when panel mounted
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Applications
Controlling the Mixing Ratio of Two Fluids		Comparing Fluid Inflow & Outflow
	Displaying and alarming the input flow rate ratio of two fluids (gas or liquid) allows these to be mixed in a predetermined ratio in continuous processes. The sensing element is normally a turbine flowmeter, which outputs pulses at a frequency proportional to flow rate. The A/B ratio can also be displayed for totalized rate (or delivered volume).		The ratio of the inflow and outflow rates of a tank is a measure of the relative filling or emptying rate. The same meter can also be programmed to display the net inflow or outflow rate in flow units, or to display totalized inflow our outflow in volume units. Any of these parameters can be alarmed using the dual relay board and be transmitted via 4-20 mA, RS-232 or RS-485.
Controlling Coating Thickness on a Film		Synchronizing Two Conveyor Lines
	In this application, Channel A measures the rate at which a coating material is applied, as measured by a flow meter, while Channel B measures the speed of the film based on pulses from a proximity switch. Displaying and alarming the A/B ratio assures that an even thickness of coating material is applied as the speed of the film is varies.		The dual-channel Laureate counter can measure the speed of conveyor lines by using the output of proximity switches which sense gear teeth or spokes of rotating drive wheels. Displaying the speed ratio of two lines allows line speeds to be adjusted so that material arrives at work stations when needed.
Measuring Draw for Elongation

Draw (Ch A / Ch B - 1) can be used to display the elongation of films compressed between rollers, the shrinkage films, and the RPM difference of rollers whose speed is varied to maintain tension. The six-digit resolution of the Laureate dual channel counter / rate meter is ideal for comparison of rates that are close to each other.
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FLW, Inc - 3505 Cadillac Ave - Bldg E - Costa Mesa, CA. - 92626 - USA - Ph (714) 751 - 7512 - Fax (714) 751 - 0213