What this panel meter does
The OMRON K3MA-J-A2 AC100-240V is a 5-digit digital panel meter built for reading process signals on a machine or line. It accepts both current loops — 0 to 20 mA and 4 to 20 mA — and voltage inputs spanning 0-5 V, 1-5 V, ±5 V, and ±10 V, so it covers the common transmitter outputs you'll find on pressure, temperature, and flow sensors out here in the grease. The dual normally-open contacts give you two independent setpoint outputs for alarming or basic on/off control, which saves wiring a separate limit controller for simple monitoring tasks.
Power and environment
Powered from 100 to 240 VAC at 50/60 Hz, drawing 6 VA — a standard control-transformer tap, no special supply needed. The operating range of -10 to 55 °C means it'll sit fine inside a ventilated panel next to a warm power supply, but don't bolt it right above a heater or a hot bearing housing. The A/D conversion uses a double-integral method, which is inherently good at rejecting 50/60 Hz line noise — a practical choice when the meter shares a panel with contactors and drives.