Model L20100P by Laurel Electronics is a digital process meter which includes a process signal conditioner set so that 4-20 mA reads 0-100.00, universal 85-264 Vac or 95-300 Vdc power, two 8A Form C contact relays, and five red 14.2 mm (0.56 inch) LED digits. The meter is a cost-effective solution to monitoring and control applications which require zero and span adjustment for process signals such as 4-20 mA, 0-5 V, 0-10 V, or strain gauges. The meter is also suitable for potentiometer follower applications, where the transducer output is a changing resistance. The display is scalable to five full digits from -99,999 to +99,999 from the front panel to read directly in engineering units, such as PSI. High read rates at up to 60 or 50 conversions per second are ideal for peak or valley capture, real-time computer interface, and control. Peak and valley values are automatically captured. These may be displayed via a front panel pushbutton command or control signal at the rear connector, or be transmitted as serial data. Digital filtering is selectable for electrically noisy environments. Modular architecture provides a choice of power supply boards, relay boards for alarm or control, analog output boards, and communication boards. Available communication boards include RS232, RS485, USB and Ethernet. The Modbus protocol is fully supported as is the simpler Custom ASCII protocol. A 5V, 10V and 24V transducer excitation output is standard. Power and all inputs and outputs are mutually isolated. The meter fits in a 1/8 DIN panel cutout (92 x 45 mm) and is protected to NEMA 4X (IP65) when panel mounted. It is certified to CE, RoHS, and ETL / UL standards.