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has a display resolution of one hundredth of a Hertz (0.01Hz) from 45 to 65Hz, making it a suitable replacement for outdated analogue frequency meters and meaning that no additional components or separate power supply is required for the unit.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.