Self-powered LED meters
Designed to measure and display AC mains frequencies in the range of 45 to 65Hz, over an input voltage of 85 to 264V AC, Murata Power Solutions has introduced its third generation of DMR20 round, miniature digital panel frequency monitors. The monitors are also suitable for mounting in an industry standard ‘oiltight’ 30 and 30.5mm/1.2” round panel cut-out.
The DMR20-1-FM-R-C frequency monitor is a self-powered, 2-wire meter that does not require any additional external power sources. Equipped with a quartz crystal controlled microcontroller-based timing circuitry, the monitor is a companion product to Murata’s AC voltmeter, model number DMR20-1-ACV-R-C.
The meter has a display resolution of one hundredth of a Hertz (0.01Hz) from 45 to 65Hz, making it a suitable replacement for outdated analogue frequency meters and meaning that no additional components or separate power supply is required for the unit.
The unit features a rugged housing with seamless construction on all sides, providing protection to IP67 / NEMA 6 specifications for dust, dirt and moisture. Typical applications include use in industrial and consumer back-up generators, marine instrument panels, power distribution units (PDUs), off-grid power generation, portable generators, utility test sets and as a replacement for old analogue ‘needle-style’ frequency meters.
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