Thermo Fisher Scientific Alpha pH 2000 - Manual (Page 53)

11.4.4 Controller signal of Pulse length Controllers
t
ON t
OFF
Pulse Length T
Relay
ON
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 t
ON
is increased or decreased in accordance with
the proportional range Xp.
The following applies:
t
ON
+ t
OFF
= T (Const.)
greater divergence
Î greater tON
Xp exceeded Î t
ON
= T (relay remains picked up)