Dwyer TFLS2 - Manual

Model TFLS2 Compact Tuning Fork Level Switch
Specifications - Installation and Operating Instructions
Bulletin L-TFLS2
DWYER INSTRUMENTS, INC.
Phone: 219/879-8000 www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: 219/872-9057 e-mail: [email protected]
SPECIFICATIONS
Service: Dry powders compatible with wetted materials. Can detect bulk materials
submerged in liquid.
Sensitivity: Minimum bulk solid density: 4.4 lb/ft
3 (70 g/l), maximum particle size 0.4
in (10 mm).
Wetted Materials: 316 L SS.
Temperature Limits:
Ambient: -40 to 140°F (-40 to 60°C);
Process: -40 to 266°F (-40 to 130°C).
Pressure Limit: 600 psi (40 bar).
Power Requirement: 20 to 250 VAC, 50/60 Hz.
Power Consumption: 10 VA.
Enclosure: Aluminum, painted.
Enclosure Rating: IP65.
Switch Type: SPDT.
Electrical Rating: 5 A @ 250 VAC.
Electric Connections: Screw terminals.
Conduit Connection: 2 x 1/2˝ female NPT.
Process Connections: 1˝ male NPT.
Weight: 2.4 lb (1.09 kg).
Indication Lights: Internal: Green and red LED’s.
Sensing Delay: 0 to 6 seconds.
The Model TFLS2 Compact Tuning Fork Level Switch is an ideal choice for level
control of powders and liquids. The TFLS2 incorporates a piezoelectric crystal that
vibrates the fork at its natural frequency. When the fork comes in contact with a
material, the vibration is dampened and the switch changes state. As the fork
becomes free of material, the switch changes back to its normal state. Featured in
the TFLS2 is user selectable fail-safe operation of the contacts. The unit is not
affected by vibration from conveying systems, motors, or the movement of
material. Its compact size allows for mounting in places a larger tuning fork level
switch may not fit, providing great versatility.
The Model TFLS2 is easy to use with no calibration required and no mechanical
moving parts means no routine maintenance. The TFLS2 is not affected by the
dielectric constant of the sensed material, making it superior to a comparable
capacitance level switch for applications where the dielectric constant is low, more
than one material is being used in the single vessel, and when material moisture
content can change. The level switch is also great for applications when the bulk
density is too low for a rotating paddle level switch, making it the ideal choice for
low density bulk solids and liquids.
All of the wiring should use the 18 AWG standard isolation cable, and it is
compulsory to keep out dust in the housing to avoid electric short. To prevent water
or moisture penetrating into the housing, please rotate the screw cover in the
clockwise direction and make sure it is tightly locked.
FAIL SAFE MODE
1. Confirm the vessel is empty before calibration.
2. The default configuration of OUTPUT MODE is FSH (High Level Fail Safe).
3. Two ranges (L and H) for different material specific gravity. Factory value is L.
The user can change the range for different specific material; L for high specific
gravity material (like steel and rock) and H for low specific gravity material (like
milk powder, Styrofoam, and plastic).
GROUND
1˝ NPT
3-5/16
[84.00]
4-9/64
[105.00]
63/64
[25.06] 25/32
[19.99]