Page 1
1˝ NPT
3-5/16
[84.00]
4-9/64
[105.00]
63/64
[25.06]
25/32
[19.99]
Model
TFLS2
Compact Tuning Fork Level Switch
Compact, Cost Effective, For Bulk Solids
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The Model TFLS2 Compact Tuning Fork Level Switch is an ideal choice for level
control for powders. 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 material is removed from the fork, 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 adjustable calibration, 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.
SPECIFICATIONS
Service: Dry powder compatible with
wetted materials.
Sensitivity: Min. bulk solid density: 4.4
3
(70 g/l); Max. particle size: 0.4˝
lb/ft
(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.
Model TFLS2-01, Compact Tuning Fork Level Switch
Enclosure: Aluminum, painted.
Enclosure Rating: IP65.
Switch Type: SPDT.
Electrical Rating: 5 A @ 250 VAC.
Electric Connections: Screw
terminals.
Conduit Connection: 1/2˝ female NPT
x 2.
Process Connections: 1˝ male NPT.
Indication Lights: Internal: Green and
red LED’s.
Sensing Delay: 0 to 6 s.
Weight: 2.4 lb (1.09 kg).
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