P.O. Box 40525 · Houston, Texas USA 77240-0525
Tel: 713·466·3552 · Fax: 713·896·7386
www.norriseal.com
1001-0113O — ©2013, January 2013
this(reason some field assembly
is required. Insert the displacer
arm in the opening in the con-
troller body. Carefully align the dis-
placer arm in the body shaft and
screw the arm into the shaft. If this
is a vertical installation, screw the
swivel onto the free end of the dis-
placer arm. Screw the displacer
either into the free end of the dis-
placer arm (horizontal application)
or the free end of the swivel (ver-
tical application).
4. Install the controller using good
piping practice. For flanged bod-
ies, use a suitable gasket between
the body and vessel flanges. For
threaded (NPT) bodies, use TFE
tape or pipe thread sealant on
external pipe threads.
C A U T I O N !
The Bodies are rated ANSI 150, 300, 600,
900, 1500 or 2500 class. Do not install the
level controller in a system where the
working pressures can exceed those
marked on the nameplate.
5. Connect instrument air to the
controller supply connection on
the back of the controller. The
supply and output connections are
clearly marked. On the 1001 con-
troller, it is the upper connection.
On the 1001A and 1001XL con-
trollers, it is the connection on the
right when looking at the rear of
the controller case. Connect the
control valve signal line to the out-
put connection.
6. Open the case and rock the torque
bar by hand to verify the displacer
arm moves freely and is NOT rest-
ing against the vessel nozzle or
other obstruction. The arm must
be reasonably centered in the con-
nection opening, parallel to the
ground. If necessary, turn the
adjusting knob under the Balance
Spring to position the arm in the
center of the connection opening.
1.1 L
EVEL
A
DJUSTMENT
NOTE: All controllers are factory pre-
set for average level and sensitivity
1. With the displacer arm centered
in the vessel nozzle as described
in paragraph 1.0, Step 6, to lower
the level, turn the adjusting knob
under the Balance Spring
CLOCKWISE to increase com-
pression on the Balance Spring
(decrease level). To raise the level,
turn the knob COUNTER-CLOCK-
WISE to decrease compression on
the Balance Spring (increase
level).
2. Adjust the proportional band
(dump span) by first loosening the
thumb screw on the Sensitivity
Fulcrum. Slide the fulcrum along
the Flapper Bar toward the snap
ring (toward the pilot) to
DECREASE proportional band and
INCREASE SENSITIVITY. Slide the
fulcrum along the Flapper Bar
away from the snap ring (away
from the pilot) to INCREASE pro-
portional band and DECREASE
SENSITIVITY. Tighten the thumb
screw on the Sensitivity Fulcrum
when the proper span is selected.
1.2 L
IQUID
L
EVEL
I
NTERFACE
NOTE: All controllers are factory pre-
set for average level and sensitivity.
1. Set the Sensitivity Fulcrum 1⁄4 in.
from the snap ring, reduce the
spring tension slowly by turning
the adjusting knob COUNTER-
CLOCKWISE, and let the UPPER
fluid rise to submerge the
displacer. Fine tune after the dis-
placer is fully submerged in the
UPPER fluid by slowly increasing
spring tension (turning adjusting
knob CLOCKWISE) until an output
signal is obtained. Then back the
tension off slowly (turning adjust-
ing knob COUNTER-CLOCKWISE)
until the output signal pressure
returns to zero.
2. Let the lower fluid rise until the
desired interface level is reached.
Fine tune by slowly increasing
spring tension (turning adjusting
knob CLOCKWISE) until an output
signal is obtained. Then back the
tension off the Balance Spring
slowly (turning adjusting knob
COUNTER-CLOCKWISE) until the
output signal pressure returns to
zero.
O
PERATING AND
M
AINTENANCE
M
ANUAL
Series 1001, 1001A, 1001XL Level Control
Page 6 of 12
Pivot
Pin
Torque Bar
Balance
Spring
Adjusting
Knob
Sensitivity
Fulcrum
Snap Ring
Direct acting
Reverse acting
Figure 8 — How to make level adjustments
