EUTECH INSTRUMENTS ALPHA DO 500 DISSOLVED OXYGEN Manuale delle Istruzioni Scaricare il pdf (Pagina 46)

Instruction manual αlpha DO 2000

11.4.4 Control signal of Pulse length Controllers

Relay

tON

tOFF

Pulse Length T

OFF

Time [s]

The output relay of the pulse length controller is clock-timed. The switching period T remains

constant. Depending on the divergence from the limit value, the switch on time tON is

increased or decreased in accordance with the proportional range Xp.

The following applies:

tON + tOFF = T (Const.)

greater divergence Î greater tON

Xp exceeded Î tON = T (relay remains picked up)

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EUTECH INSTRUMENTS ALPHA DO 500 DISSOLVED OXYGEN Manuale delle Istruzioni Pagina 46