Instruction Manual
D103032X012
L2 Controller
July 2015
13
Assembly
WARNING
Improper assembly of the O‐rings, anti‐extrusion ring, and backup ring could result in O‐ring extrusion and permit leakage
of process fluids. To avoid personal injury or property damage from leaking process fluid, be sure the O‐rings,
anti‐extrusion ring and backup ring are assembled in the order shown in figure 7.
2. Slide the O‐ring (key 74), anti‐extrusion ring (key 75) and retaining ring (key 76) onto the displacer rod assembly
(key 64). Be sure the O‐ring, anti‐extrusion ring, and retaining ring are in the order shown in figure 7. Slide the pivot
base onto the displacer rod so that the points of the pivot body (key 72) will engage the slots in the pivot base
(key 73).
3. Install the O‐ring (key 77) and backup ring (key 78) into the groove on the pivot base (key 73). Be sure the backup
ring is on the downstream pressure side of the O‐ring as shown in figure 7.
4. Insert the displacer rod (key 64) into the vessel side of the sensor connection (key 65).
5. The pivot base must seat in the slots cast in the sensor connection. These slots will be horizontal when the sensor
connection (key 65) is oriented as shown in figure 2.
6. To reduce the possibility of nicking the O‐ring (key 77) on the pivot base, keep the displacer rod centered in the
sensor connection as much as possible while pushing the pivot base into the sensor connection. Be sure the pivot
base seats in the slots cast in the sensor connection.
7. Slide the spring (key 68) and spacer (key 66) onto the displacer rod and secure with the hex nut (key 67). Fully
tighten the hex nut (key 67).
8. View the sensor connection from the vessel side. Ensure that the pivot body arms remain aligned with the pivot
base arms (the two pivot body points are seated in the pivot base slots).
9. Install the sensor on the tank.
Replacing the Controller Relay
Refer to figure 8 for key number locations unless otherwise indicated.
1. Disconnect the supply and output pressure lines.
2. Remove the two relay mounting screws (key 33), and pull the relay away from the controller base (key 1).
3. Install the new relay using two relay mounting screws (key 33). Make certain that the relay mounting O‐rings (keys
43 and 44, not shown) are completely in their mounting bosses before installing the relay. Make certain span lever B
(see figure 5) is in line with and pushing in on the end of either the relay adjustment screw (key 49, throttling
controller) or the pilot valve plug of the valve assembly (key 51, snap‐acting controller).
Replacing the Controller Supply Filter
Refer to figure 8 for key number locations unless otherwise indicated.
1. Disconnect the supply and output pressure lines.
2. Loosen the filter cap screws (key 17), and rotate the filter cap (key 14) to the side to uncover the supply filter
(key 15).
3. Remove the old filter (key 15), and remove any debris from the filter boss.
4. Install a new supply filter. Reinstall the filter cap (key 14), and tighten the filter cap screws (key 17).
