Dwyer TFLS2 User Manual

Bulletin L-TFLS2

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Model TFLS2 Compact Tuning Fork Level Switch

Specifications - Installation and Operating Instructions

he 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

he TFLS2 is user selectable fail-safe operation of the contacts. The unit is not

ffected by vibration from conveying systems, motors, or the movement of

aterial. Its compact size allows for mounting in places a larger tuning fork level

m 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.

SPECIFICATIONS

ervice: Dry powders compatible with wetted materials. Can detect bulk materials

ubmerged in liquid.

ensitivity: Minimum bulk solid density: 4.4 lb/ft

in (10 mm).

Wetted Materials: 316 L SS. Temperature Limits:

Ambient: -40 to 140°F (-40 to 60°C);

rocess: -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.

70 g/l), maximum particle size 0.4

(

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).

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: info@dwyer-inst.com

UNCTIONAL DESCRIPTION

SH High Level Fail Safe Protection

UTPUT MODE is located at FSH. The tuning fork is installed at a high level position.

. Relay Contact Output

1 A. Normal Status: SIGNAL light on means that the tuning fork is at normal status.

The sensor probe does not come in contact with the medium and relay NO and COM are conductive.

. Failure Status: Under the power failure, SIGNAL light off means that the tuning

ork locates at the failure status. At the same time, relay NC and COM are

onductive. In other words, if the sensor probe contacts with the medium, that

eans the medium is higher than the high level.

FSL Low Level Fail Safe Protection

OUTPUT MODE is located at FSL. The tuning fork is installed at a low level position.

. Relay Contact Output

. Normal Status: SIGNAL light on means that the tuning fork is covered by the

edium, and the relay NO and COM contact are conductive.

B. Failure Status: Under the power failure, SIGNAL light off means that the tuning fork

locates at the failure status. At the same time, relay NC and COM are conductive. In other words, if the sensor probe does not come in contact with the medium, that means the medium is lower than the low level.

NSTALLATION

ORIZONTAL INSTALLATION

. Do not install near substance inlet.

2. Conduit faces downward at installation.

3. The surface of the two fork blades needs to be facing each other horizontally.

ERTICAL INSTALLATION

. With high sensitivity, switching point is distanced .59 in (15 mm) away from the tip

of fork.

Diagram of Relay Contact Output

2. Opening of the two fork blades is to be as the flow direction.

3. Do not install near the substance inlet.

MAINTENANCE/REPAIR

Upon final installation of the Model TFLS2 no routine maintenance is required. The Model TFLS2 is not field serviceable and should be returned if repair is needed. Field repair should not be attempted and may void warranty.

WARRANTY/RETURN

Refer to “Terms and Conditions of Sales” in our catalog and on our website. Contact customer service to receive a Return Goods Authorization number before shipping the product back for repair. Be sure to include a brief description of the problem plus any additional application notes.

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: info@dwyer-inst.com