Dwyer CLT - Manual

Continuous Level Transmitters
Series CLT
Operating Principle
The CLT Series utilizes reed switch/magnet technology. A
magnet-equipped float rises or lowers with corresponding
liquid level. The magnetic field generated from the float
actuates a series of reed switches mounted within a sealed
hollow tube. The series of reed switches is combined with
resistors to form a voltage divider.
When a regulated DC voltage is applied to an CLT, the
resulting voltage output is directly proportional to liquid level.
Installation / Mounting
Units operate normally in any attitude, from vertical to a 30° inclination, up or down.
Thread Treatment
Sealing: When threading metal threads into a metal coupling , pipe sealant or Teflon tape is
recommended. Due to potential compatibility problems, when sealing plastic threaded units, a
compatible pipe sealant such as "No More Leaks" from Permatex is recommended.
Tightening (Plastic to Metal): When threading a plastic sensor into a metal coupling, the in-
staller should use a suitable wrench and tighten the threads 1 to 1-1/2 additional turns past hand-
tight. Over-torquing of the threads will result in damage to the plastic mounting plug.
Tightening (Metal to Metal): When threading a metal sensor into a metal coupling, the installer
should use a suitable wrench and tighten the threads 1-1/2 turns past hand-tight.
Junction
Box
Sealed
Hollow
Tube
Float
Meter
(Optional)
Important Points!
Designed for continuous liquid level sensing, Dwyer transmitters are considered "components".
DWYER INSTRUMENTS,INC.
P.O.BOX 373 MICHIGAN CITY, INDIANA 46361, U.S.A.
Phone: 219/879-8000 www.dwyer-inst.com
Fax: 219/872-9057 e-mail: [email protected]
Lit-By Fax: 888/891-4963
MAINTENANCE/REPAIR
Regular maintenance of the total system is recommended to assure sustained optimum performance. These devices are
not field repairable and should be returned to the factory if recalibration or other service is required. After first obtaining a
Returned Goods Authorization (RGA) number, send the unit freight prepaid to the following. Please include a clear descrip-
tion of the problem plus any application information available.
Dwyer Instruments, Inc.
Attn: Repair Department
102 Highway 212
Michigan City, IN 46360
Important Points!
Product must be maintained and installed in strict accordance
with the National Electrical Code and Dwyer product catalog
and instruction bulletin. Failure to observe this warning could
result in serious injuries or damages.
For hazardous area applications involving such things as (but
not limited to) ignitable mixtures, combustible dust and
flammable materials, use an appropriate explosion-proof
enclosure or intrinsically safe interface device.
The pressure and temperature limitations shown on the
individual catalog pages and drawings for the specified flow
switches must not be exceeded. These pressures and
temperatures take into consideration possible system surge
pressures/temperatures and their frequencies.
Selection of materials for compatibility with the media is critical
to the life and operation of Dwyer products. Take care in the
proper selection of materials of construction, particularly wetted
materials.
Life expectancy of switch contacts varies with applications.
Contact Dwyer if life cycle testing is required.
Ambient temperature changes do affect switch set points,
since the specific gravity of a liquid can vary with temperature.
Dwyer Products have been designed to resist shock and
vibration; however, shock and vibration should be minimized.
Filter liquid media containing particulate and/or debris to
ensure the proper operation of our products.
Electrical entries and mounting points in an enclosed tank
may require liquid/vapor sealing.
Dwyer Products must not be field-repaired.
Physical damage sustained by the product may render it
unserviceable.