Asahi Keiki AS-243-3V-4 Process Monitor Digital Panel Meter

The Asahi Keiki AS-243-3V-4 Process Monitor Digital Panel Meter is a compact, DIN-size single-channel indicator designed for direct panel mounting that accepts a DC voltage input up to 10 V and displays the value on an 8 mm red LED readout across four and a half digits (0–9,999). It uses a 1 MΩ input impedance and provides input protection up to ±250 V, with isolation from the DC power supply. Powered from DC 24 V (±20%), it draws about 30 mA and fits a panel cutout of 24 × 48 mm with panel thickness 0.8–3.5 mm. Scaling is user-adjustable via rear switches and a front fine-tune, with a settable decimal point, a span of 10,000 counts, and an offset range of ±5,000; the display also indicates overrange by flashing when the input exceeds the maximum. The unit is designed for DC voltage measurement with the AS-243 family offering range options such as 0–10 V (AS-243-3V), and it includes a hold function (COM and S/H short) for stable readings and automatic minus-sign indication for negative values. Key electrical specs include a conversion rate of 2.5 measurements per second, 0 to 50°C operation with 35–85% RH, and dielectric strength of 1,500 V between input and the panel and 500 V between input and the power supply, with insulation resistance of 100 MΩ or more at 500 V. Accessories include a connector and instruction manual, making it suitable for process control panels, data logging interfaces, and instrumentation where a compact, isolated DC voltage indicator with precise scaling is required.