©Copyright 2010 Dwyer Instruments, Inc.
Printed in U.S.A. 2/10
FR# 82-440881-00 Rev. 3
W.E. ANDERSON DIV., DWYER INSTRUMENTS, INC.
P.O. BOX 358 • MICHIGAN CITY, INDIANA 46361 U.S.A.
Phone: 219/879-8000
www.dwyer-inst.com
Fax: 219/872-9057
e-mail: [email protected]
INSTALLATION
1. The Model L8 Level Switch is designed for use in clean, com-
patible process media free from scale, debris and other for-
eign material which could collect on the float and impede its
movement. Build up from such materials will prevent proper
operation. See wetted materials list in the specifications to
assure compatibility with process liquids.
2. Unpack switch and remove any packing material from the
switch and float. Due to variations in fittings and amount of
thread engagement, float must be checked for proper oper-
ation during installation.
3. Use pipe thread sealant tape or pipe thread sealant to seal
the 1˝ NPT mounting connection. Avoid excess sealant
which could interfere with float movement. Do not exceed 50
ft/lb (40n/m) torque on the switch housing. Damage can
result.
4. Install switch in a horizontal position with index arrow point-
ing down.
5. Wire in accordance with local electrical codes. Lead wire
color codes are as follows. Black - Common, Red - Normally
Closed, Blue - Normally Open. Normal is the contact condi-
tion when liquid level is below the actuation point. Closed
contacts open and open contacts close when liquid level lifts
the float to the actuation point.
6. Switch electrical components must be protected from mois-
ture at all times. If necessary, install a lightweight, waterproof
junction box over the
1
/
2
˝ NPT threaded stem. Do not place
mechanical loading on the switch housing. Permanent dam-
age can occur. Use flexible Romex sheathing or equivalent.
Inconel
®
is a registered trademark of Huntington Alloys Corporation.
MAINTENANCE
The Model L8 Liquid Level Switch is not field serviceable and
should be returned if repair is needed (field repair should not be
attempted and may void warranty). Be sure to include a brief
description of the problem plus any relevant application notes.
Contact customer service to receive a return goods authorization
number before shipping.
E-41:Bulletin E-41 1/29/10 9:02 AM Page 2
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