Dwyer L4 - Manual (Page 3)

Bulletin E-73
INSTALLATION
NOTES:
• Check all ratings given in the instructions and on the product to make
sure that the product is suitable for your application. Do not exceed
electrical ratings, pressure ratings, or temperature ratings of the product.
• Disconnect power supply before beginning installation to prevent
possible equipment damage or electrical shock.
1. Remove packing material from switch body-cap and remove tape from
magnet keeper. Install standard switch in thredolet previously welded to
tank. Install optional switch mountings per application drawings. Make
sure locknuts on float are tight.
2. When mounting switch in the side of a tank, the arrow on the side of
the switch must point up.
3. Wiring: UL and CSA units only: Thread connecting wires through
conduit and connect. ATEX units only: Wire in accordance with local
electrical codes. Cable should enter enclosure housing through an
approved Exx d cable gland (not supplied).
Black - Common
Blue - N.O.
Red - N.C.
NOTE: Double pole, double throw switches have dual black, blue and
red leads. These are connected in the same manner as single pole,
double throw switches, as described above.
ATEX and IECEx Installation Instructions:
Cable Connection
The cable entry device shall be certified in type of explosion
protection flameproof enclosure “d”, suitable for conditions of use
and correctly installed. Cable entry may exceed 70°C. Conductors
and cable gland rated ≥90°C shall be used.
Conduit Connection
An Ex d certified sealing device such as a conduit seal with setting
compound shall be provided immediately to the entrance of the
valve housing. Cable entry may exceed 70°C. Conductors and cable
gland rated ≥90°C shall be used.
NOTE: The switch is deactivated and contacts are in normal condition
when the liquid is below the float.
4. Make sure conduit or cable are properly sealed. Electrical
components must be kept free of moisture, including condensation, at all
times.
CAUTION: To prevent ignition of hazardous atmosphere, disconnect the
device from the supply circuit before opening. After de-energizing, delay
10 minutes before opening. Keep assembly tightly closed when in
operation.
Note: ATEX and IECEX units only: The temperature class is determined
by the maximum ambient and or process temperature. Units are
intended to be used in ambient of -20°C≤Tamb≤73°C. Units may be
used in process temperatures up to 133°C providing the enclosure
and switch body temperature do not exceed 73°C. The standard
Temperature Class is T6 Process Temp ≤73°C.
5. For units supplied with both internal ground and external bonding
terminals, the ground screw inside the housing must be used to ground
the control. The external bonding screw is for supplementary bonding
when allowed or required by local code. When external bonding
conductor is required, conductor must be wrapped a minimum of 180°
about the external bonding screw. See below.
NO
NC C
TERMINAL CONNECTIONS
NO NC C NO NC C
SPDT DPDT
Limited Warranty: The Seller warrants all Dwyer instruments and equipment to be free from defects in workmanship or material under normal use and service for a period
of one year from date of shipment. Liability under this warranty is limited to repair or replacement F.O.B. factory of any parts which prove to be defective within that time or
repayment of the purchase price at the Seller’s option provided the instruments have been returned, transportation prepaid, within one year from the date of purchase. All
technical advice, recommendations and services are based on technical data and information which the Seller believes to be reliable and are intended for use by persons
having skill and knowledge of the business, at their own discretion. In no case is Seller liable beyond replacement of equipment F.O.B. factory or the full purchase price. This
warranty does not apply if the maximum ratings label is removed or if the instrument or equipment is abused, altered, used at ratings above the maximum specified, or otherwise
misused in any way.
THIS EXPRESS LIMITED WARRANTY IS IN LIEU OF AND EXCLUDES ALL OTHER REPRESENTATIONS MADE BY ADVERTISEMENTS OR BY AGENTS AND ALL
OTHER WARRANTIES, BOTH EXPRESS AND IMPLIED. THERE ARE NO IMPLIED WARRANTIES OF MERCHANTABILITY OR OF FITNESS FOR A PARTICULAR
PURPOSE FOR GOODS COVERED HEREUNDER.
Buyers Remedies: THE BUYER’S EXCLUSIVE AND SOLE REMEDY ON ACCOUNT OF OR IN RESPECT TO THE FURNISHING OF NON-CONFORMING OR DEFECTIVE
MATERIAL SHALL BE TO SECURE REPLACEMENT THEREOF AS AFORESAID. THE SELLER SHALL NOT IN ANY EVENT BE LIABLE FOR THE COST OF ANY LABOR
EXPENDED ON ANY SUCH MATERIAL OR FORM ANY SPECIAL, DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES TO ANYONE BY REASON OF THE FACT THAT
IT SHALL HAVE BEEN NON-CONFORMING OR DEFECTIVE.
MAINTENANCE
Inspect and clean wetted parts at regular intervals. The cover should be
in place at all times to protect the internal components from dirt, dust, and
weather, and to maintain hazardous location ratings. Disconnect device
from the supply circuit before opening to prevent ignition of hazardous
atmosphere. Repairs to be conducted by Dwyer Instruments, Inc. Units
in need of repair should be returned to the factory prepaid.
SIDE VIEW DETAIL FRONT VIEW DETAIL
CLAMP
CLAMP PLATE
SCREW
LOCKWASHER
CONDUCTOR