EUTECH INSTRUMENTS ALPHA DO 500 DISSOLVED OXYGEN Bedienerhandbuch PDF herunterladen (Seite 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 Bedienerhandbuch Seite 47