EUTECH INSTRUMENTS ALPHA DO 500 DISSOLVED OXYGEN Manual de Instruções descarregar pdf (Página 47)

Instruction manual αlpha DO 2000

11.4.5 Control signal of Pulse Frequency Controllers

Relay

tON

tOFF

Pulse Length T

OFF

Time [s]

The output relay of the pulse frequency controller is clock-timed. The pulse duration tON

remains constant at 250 msec. Depending on the divergence from the limit value, the

frequency (1/T) is increased or decreased in accordance with the proportional range Xp.

The following applies:

tON = Const. (250 msec.)

greater divergence Î greater f (greater frequency)

Xp exceeded Î max. frequency

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EUTECH INSTRUMENTS ALPHA DO 500 DISSOLVED OXYGEN Manual de Instruções Página 47