Laureate Digital Panel Meter for Process, LAUREL Strain & Potentiometer Follower Signals ELECTRONICS, INC. Features Selectable 0.2, 2, 20, 200, 300 & 600 Vdc voltage ranges Selectable 2, 20, 200 mA and 5A dc current ranges All ranges factory calibrated 99.99% full scale accuracy Scalable to 99,999 for display in engineering units Up to 60 conversions per second Peak or valley capture & display Universal AC power: 85-264 Vac Built-in isolated excitation supply: 5, 10 or 24 Vdc Ratiometric compensation for variations in excitation voltage 1/8 DIN case sealed to NEMA-4X from front panel Optional serial I/O: Ethernet, USB, RS232, RS485, Ethernet-to-RS485 converter Optional relay output: dual or quad relays, contact or solid state Optional isolated analog output: 4-20 mA, 0-20 mA, 0-10V, -10 to +10V Optional low voltage power: 10-48 Vdc or 12-32 Vac Description Laureate digital process and strain panel meters are a cost- Peak and valley values are automatically captured. These may effective solution to monitoring and control applications which be displayed via a front panel pushbutton command or control require zero and span adjustment for process signals such as signal at the rear connector, or be transmitted as serial data. 4-20 mA, 0-5 V, 0-10 V, or strain gauges. The meters are also High read rates at up to 60 or 50 conversions per second while suitable for potentiometer follower applications, where the integrating the signal over a full power cycle are provided by transducer output is a changing resistance. Concurrent Slope (US Pat 5,262,780) analog-to-digital conver- The display is scalable to five digits from -99,999 to +99,999 sion. High read rates are ideal for peak or valley capture, real- from the front panel to read directly in engineering units, such time computer interface, and control. Peak and valley values are as PSI. Three scaling methods are selectable: scale and offset, automatically captured. These may be displayed via a front panel two-point method, and system-level calibration using actual pushbutton command or a control signal at the rear connector, or transducer signals. All ranges are precalibrated at the factory, so be transmitted as serial data. that recalibration is not needed when changing ranges or signal Digital filtering is selectable for electrically noisy environments, conditioners. including a batch averaging filter and an adaptive moving aver- Strain gauges with a 20 mV output can be scaled to display up age filter which provides a choice of 8 time constants from 80 ms to 10,000 counts with a 4-wire ratiometric connection, while 200 to 9.6 s. When a significant change in signal level occurs, that mV outputs of can be scaled to display up to 99,999 counts. For filter adapts by briefly switching to the shortest time constant to higher sensitivity, 20 mV signals can be scaled to 99,999 counts follow the change, then reverts back to the selected time con- with a 4- or 6-wire connection using the Laureate load cell meter. stant. In a selectable Auto filter mode, the filter time constant is automatically selected based on detected signal noise. A high input impedance of 1 Gohm is provided on 200.00 mV and 2.000 V ranges to minimize the load on the voltage signal. Designed for system use. Optional plug-in boards include Ethernet and other serial communication boards, dual or quad An isolated 5, 10 or 24 Vdc isolated excitation output is relay boards, and an isolated analog output board. Laureates standard to power external transducers and transmitters. Up to may be powered from 85-264 Vac or optionally from 12-32 Vac 120 mA is provided at 10V to power four 350 ohm load cells in or 10-48 Vdc. The display is available with red or green LEDs. parallel. When powering strain gauges, load cells or potentio- The 1/8 DIN case meets NEMA 4X (IP65) specifications from the meters, the excitation output is monitored by the meter to front when panel mounted. Any setup functions and front panel eliminate errors due to voltage variations. keys can be locked out for simplified usage and security. A built- in isolated 5, 10, or 24 Vdc excitation supply can power trans- High read rates at up to 60 or 50 conversions per second while ducers and eliminate the need for an external power supply. All integrating the signal over a full power cycle are provided by power and signal connections are via UL / VDE / CSA rated Concurrent Slope (US Pat 5,262,780) analog-to-digital conver- screw clamp plugs. sion. High read rates are ideal for peak or valley capture, real- time computer interface, and control. LAUREL ELECTRONICS INC., 3183-G Airway Ave., Costa Mesa, CA 92626, USA Tel 714-434-6131 www.laurels.com 1 Specifications DC Voltage Range Resolution Input Resistance Error at 25C 2 counts 200.00 mV 10 V 1 G 0.01% FS 2.0000 V 100 V 1 G 0.01% FS 20.000 V 1 mV 10 M 0.01% FS 200.00 V 10 mV 10 M 0.01% FS 600.0 V * (not UL) 100 mV 10 M 0.02% FS 300.0 V 100 mV 10 M 0.02% FS DC Current Range Resolution Input Resistance Error at 25C 2 counts 2.0000 mA 0.1 A 100 0.01% FS 20.000 mA 1.0 A 10 0.01% FS 200.00 mA 10 A 1 0.01% FS 5.000 A 1.0 mA 0.01 0.04% FS Display Readout 5 LED digits, 7-segment, 14.2 mm (.56 ), red or green. Range -99999 to 99999 or -99990 to 99990 (count by 10) Indicators Minus sign, 2 red LED lamps A-to-D Conversion Technique Concurrent Slope (Pat 5,262,780) A-to-D rate 60/s at 60 Hz, 50/s at 50 Hz Output update rate 56/s at 60 Hz, 47/s at 50 Hz Display update rate 3.5/s at 60 Hz, 3/s at 50 Hz Accuracy Error at 25C 0.01% FS 2 counts (except 5A range) Span tempco 0.003% of reading/C Zero tempco 0.1 count/C Noise Rejection CMR, DC to 60 Hz 130 dB NMR at 50/60 Hz 90 dB with min filtering Maximum Signal Max applied voltage 600 Vac for 20, 200 and 300 V ranges, 125 Vac for other ranges Current protection 25x for 2 mA, 8x for 20 mA, 2.5x for 200 mA, 1x for 5 A Power Voltage, standard 85-264 Vac or 90-300 Vdc (DC operation is not UL approved) Voltage, optional 12-32 Vac or 10-48 Vdc Frequency DC or 47-63 Hz Power Isolation 250V rms working, 2.3 kV rms per 1 min test Excitation Output (standard) Selectable levels 5 Vdc 5%, 100 mA 10 Vdc 5%, 120 mA 24 Vdc 5%, 50 mA Output isolation 50 Vdc to meter ground Analog Output (optional) Output levels 4-20 mA, 0-20 mA, 0-10V, -10 to +10V (jumper selectable) Current compliance 2 mA at 10V ( > 5 k load) Voltage compliance 12V at 20 mA (< 60 load) Scaling Zero and full scale adjustable from -99999 to +99999 Resolution 16 bits (0.0015% of full scale) Isolation 250V rms working, 2.3 kV rms per 1 min test LAUREL ELECTRONICS INC., 3183-G Airway Ave., Costa Mesa, CA 92626, USA Tel 714-434-6131 www.laurels.com 2