Yokogawa PK200 - Manual (Page 24)

IM 21B03D01-01E 6-2
6. MAINTENANCE
Screen filter
F0604.EPS
Figure 6.4 Removing the Screen Filter (IN Side)
6.3.2 Replacing the Controller Relay
(1) Set the air supply pressure to zero.
(2) Remove the controller relay from the bottom of the
converter.
Unscrew the two mounting screws on the lower
front face of the converter main body (see Figure
6.5) using a Phillips screwdriver. The relay can be
removed downward.
(3) When installing a new relay, attach the relay to the
bottom of the converter, then fasten the relay using
the two mounting screws at the front face of the
converter.
Control relay
F0605.EPS
Figure 6.5 Removing the Control Relay
6.3.3 Replacing the Amplifier Assembly
An amplifier for replacement comes with a tube and
four set screws.
Removing the Amplifier
(1) Turn off the power and set the air supply pressure
to zero.
(2) Turn the amplifier cover counterclockwise to
remove it.
(3) Adjust the zero adjustment control to the position
indicated in Figure 6.6.
F0606.EPS Closeup of zero adjustment
Zero adjustment screw
Zero adjustment
Figure 6.6 Zero Adjustment
(4) Remove the silicon tube (a) from the pressure
sensor on the amplifier.
(5) Remove the four set screws (b) for fixing wires on
the amplifier and then disconnect the wires.
(6) Remove the four set screws (c) for fixing the
amplifier.
F0607.EPS
(a) (a)
(c)
(b)
(b)
(b)
(b)
(c)
(c)
(c)
Figure 6.7 Pressure Sensor and Amplifier Set Screws