Dover NORRISEAL 1001 Series Operating And Maintenance Manual Download Page 7

Page: 7 / 12

P.O. Box 40525 · Houston, Texas USA 77240-0525
Tel: 713·466·3552 · Fax: 713·896·7386
www.norriseal.com

3. If a longer dump span is desired,

move the fulcrum farther away
from the snap ring and repeat the
above procedure.

2.0 L

EVEL

ONTROLLER

AINTENANCE

WA R N I N G !

Before attempting any repairs, isolate the
controller from the system and make sure
that all pressure is released from the
controller body. Shut off and vent supply
and output (signal air) lines to the
controller. On electric pilots, disconnect all
power to the controller.

1. Isolate the controller from the

process.

2. Shut off the output and supply

lines to the controller. If the pilot is
electric, turn off and lock out all
electrical power to the controller.

3. Release the process pressure.

Controller parts are built to withstand
a great deal of wear under normal
operating conditions and will rarely
need to be repaired. Should repair
be necessary, the following sections
describe the procedures for disas-
sembling and re-assembling the

controller for normal maintenance
and troubleshooting.

2.1 L

EVEL

ONTROLLER

REVENTUIVE

AINTENANCE

1. In normal service, O-Rings and

the bearings on the main shaft
should last for many years. If a
leak occurs, replace the O-Rings.
Order a Level Seal Kit (LSK)
from Norriseal.

2. If the controller is used in high-

paraffin service or interface con-
trol with a horizontal displacer,
remove and inspect the body of
the controller after three (3)
months of service and check for
debris buildup. Future inspection
times after initial inspection can
be gauged by how much buildup
of debris occurred in the initial
three (3) months of service.

2.2 L

EVEL

ONTROLLER

ISASSEMBLY

NOTE: These instructions do not
apply to the pilot. See Paragraph 2.4
for instructions for removing and/or
replacing the pilot.

1. Relax all tension on Balance

Spring.

2. Remove the Balance Spring and

upper spring retainer.

3. Remove the stud bolt holding the

adjusting knob and remove both
from the case.

4. Remove the lock nut from the

Flapper Bar. Slide the Flapper Bar
off of the Pivot Pin. NOTE: DO
NOT remove either Pivot Pin from
the case. They are press-fit into
the case and not meant to be
removed. Do not remove the
Sensitivity Fulcrum or the thumb
screw.

5. Remove the lock nut from the

torque bar. Slide the torque bar
off of the shaft.

6. While holding the Level Adjusting

Bar still, loosen the two cap
screws until the Level Adjusting
Bar is free on the shaft. NOTE: It is
not necessary to remove or adjust
the adjusting screw on the Level
Adjusting Bar unless converting
the case mounting. Slide the Level
Adjusting Bar from the shaft. Slide
the spacer from the shaft.

7. Remove the two cap screws

holding the case to the body.
Remove the case from the body.

2.3 L

EVEL

ONTROLLER

EASSEMBLY

1. Mount the case to the body with

two cap screws. Tighten the
screws to 6 ft.-lbs.

2. Slide the spacer on the shaft.

3. If the level adjusting screw has

been removed or adjusted during
disassembly, position the screw
so that there is an equal amount of
thread showing above and below

PERATING AND