4195KA, KB, KC, and KS Controllers
Instruction Manual
Form 5207
April 2007
5-8
between the two switching points by moving the
position of the upper switching point.
Remote Set Point (Option M)
The capability to adjust the controller set point from
a remote location is available with all 4195KS Series
controllers. This option is designated by the letter M
in the type number.
Auto/Manual Option
Controllers with the auto/manual option (designated
by the letter E in the type number) have piping on
the output side of the relay as shown in figure 5-5.
Supply pressure to the relay is also applied to the
manual loader. The manual loader, functioning as a
regulator, applies pressure to one side of the plastic
tube and to the auto/manual switch. Output pressure
from the relay registers on the other side of the
plastic tube as well as in the auto/manual switch.
When the auto/manual switch is in the MANUAL
position, the manual loader output is channeled
through the auto/manual switch and becomes the
output of the controller. When the auto/manual
switch is in the AUTO position, the relay output is
channeled through the switch to become the output
of the controller.
Before the auto/manual switch is operated, the relay
output must equal the manual loader output to avoid
bumping the process. Adjusting the set point varies
the pressure on the left-hand side of the plastic tube.
Adjusting the manual loader knob varies the
pressure on the right-hand side. When the pressures
are equal, the metal ball is centered in the tube.
Pressure imbalance forces the ball to one end of the
tube where it forms a seal, blocking air flow through
the tube.
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