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
Hermetically Sealed switch pilots are
terminated in a junction box UL listed
Class I, Div. 1, Groups C & D and
Class II, Div. 1, Groups E, F, & G. The
switches themselves are hermeti-
cally sealed for hazardous locations
listed UL and CSA Class I, Div. 1,
Groups A, B, C, & D and Class II, Div.
1, Groups E, F, & G.
Explosion-Proof switch pilots listed
by UL and CSA for use in hazardous
locations Class I, Div. 1, Groups C &
D and Class II, Div. 1, Groups E, F, &
G. A switch listed for Class I, Div. 1,
Group B is available. CSA requires
the following statement for Class I,
Group B:
C A U T I O N !
To prevent the emission of hot particles,
joint surfaces must be thoroughly cleaned
before closing cover
1.0 L
EVEL
C
ONTROLER EN
I
NSTALLATION AND
S
TART
-
UPD
C A U T I O N !
When making connection to the vessel,
observe all safety requirements of the
area where the work is being done. Be
especially careful of pressure vessels.
WA R N I N G !
Turn off and lock out all electrical power
before beginning installation.
DA N G E R !
Special attention is required for level con-
trollers with the electric switch option.
Install approved conduit seals within 18
in. (0.5 M) of the enclosure as required
by National and Canadian Electrical
Codes. Serious personal injury and/or
property damage can result if seals are
not installed.
C A U T I O N !
Install a conduit seal with a drain loop or
other means to prevent condensate from
entering the enclosure. Failure to do so
will allow moisture to enter the enclo-
sure. This can cause equipment damage
or malfunction..
C A U T I O N !
Be sure that all wiring and conduit con-
forms to the requirements of the National
Electric Code and any enforcing agencies
having jurisdiction over the installation.
Be sure that special conditions, such as
areas having explosion hazards, are given
full consideration.
1. After unpacking the controller,
visually inspect the unit for any
evidence of shipping damage.
Shipping damage claims must be
filed with the carrier who handled
the package(s). Remove any for-
eign material that may have col-
lected during crating and
shipment. Remove the flange or
thread protectors from the body
end connection.
2. Insure that screwed and gasket
surfaces on both the controller
and the vessel are free of any for-
eign materials.
3. The controller normally ships in 3
or 4 pieces: the controller body/
case assembly, the displacer, the
displacer arm, and, for vertical
installations, the swivel. For
O
PERATING AND
M
AINTENANCE
M
ANUAL
Series 1001, 1001A, 1001XL Level Control
Page 5 of 12
Figure 6 — Hermetically sealed electric switch
Figure 7 — Explosion-proof electric switch
