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Frequency meter & totaliser with additional functions & external power supply for installation in control panels. The PMX400 series offers high-quality 4-character LED displays in 1/8 DIN format with additional functions. A variety of frequency signals can be processed with the displays. On the output side, optional analogue signals are available, as well as either two or four relay contacts for limit-value monitoring. The programmable meter components from the PTX800 series with 8-bit digital display: capable of processing input-side TTL signals or optional pulses from NAMUR and NPN/PNP sensors. Comprehensive linearisation & interference-suppression functions are available for processing measurement signals. An mA/V analogue signal & two CO contacts for limit-value monitoring are optionally available on the output side. Both counters feature 24-VDC voltage for supplying external two-wire sensors