Trumeter APM-VOLT-APO 4-Digit Digital Panel Meter, Green Positive

The Trumeter APM-VOLT-APO is a sophisticated, fully user-configurable digital panel meter designed for precise voltage measurement in industrial and control environments. This versatile instrument automatically detects and measures both AC and DC voltage inputs up to 600V with a high accuracy of 1%, making it ideal for monitoring mains voltage within control panels, power supplies, and machinery.

A standout feature is its unique hybrid display, which masterfully combines the intuitive clarity of an analogue-style bar graph with the precision of a digital readout. The easy-to-read 4-digit LCD is complemented by a dynamic 40-segment bar graph and a colour-adjustable backlight (green, red, white) that provides immediate visual feedback on changing conditions. The large, high-contrast, anti-glare screen offers a wide viewing angle, while the dedicated starburst display area is perfect for showing custom messages and alarm information.

Customisation is at the core of its design. Using the free APM configuration software, users can fully tailor the meter’s operation. This includes setting the measurement scale and range (with options for min-max, offset and gain, centre zero, or 20-point non-linear scaling), configuring up to 10 independent alarm setpoints with digital output delay, and defining the requirements for the dynamic colour-changing backlight. For system integration, the meter provides two independent outputs that can be configured as either digital signals or an analogue 4-20mA current loop for wider communication compatibility.

When paired with the optional Trumeter IoT Gateway, this panel meter becomes a powerful tool for the Industrial Internet of Things (IIoT). It can connect to the Trumeter Cloud platform, enabling remote monitoring, historical data recording, and online alarm alerts via email or optional SMS notifications. The unit features a ‘positive’ display mode, with black figures on a coloured background, which—