Instruction Manual

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 oat
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. Wire in accordance with local electrical codes.
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 certied in type of explosion protection ameproof
enclosure “d”, suitable for conditions of use and correctly installed. Cable entry
may exceed 70°C. Conductors and cable gland rated ≥95°C shall be used.
Conduit Connection
An Ex d certied 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 ≥95°C shall be used.
Note: The switch is deactivated and contacts are in normal condition when the
liquid is below the oat.
4. Make sure conduit or cable are properly sealed. Electrical components must be
kept free of moisture, including condensation, at all times.
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.
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.
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 specied, 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.
CLAMP
SCREW
LOCKWASHER
CONDUCT
OR
Front view detail Side view detail
Terminal connections SPDT Terminal connections DPDT
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.
CAUTION