EUTECH INSTRUMENTS ALPHA DO 500 DISSOLVED OXYGEN Instruction Manual download pdf (Page 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 Instruction Manual Page 46