Dwyer Omega – Series TFLS Tuning Fork Level Switch for Powders, Immune to Vibrations, No Calibration
Product Code: Series TFLS
Manufacturer: Dwyer Omega
The Series TFLS Tuning Fork Level Switch is ideal for level control of powders and fine grained solids, especially those with a low bulk density. The TFLS incorporates a piezoelectric crystal that vibrates the fork at its natural frequency. When the fork comes in contact with 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 TFLS is user-selectable fail-safe operation of the contacts. Unit is not affected by vibration from conveying systems, motors, or the movement of material. It can be mounted in any position and is available with factory built extensions for mounting on the top of the storage vessel.
Series TFLS is easy to use, with no calibration required and with no mechanical moving parts there is no routine maintenance required. The TFLS is unaffected by the dielectric constant of the sensed material, making it superior to a capacitance level switch for applications where the dielectric constant is too low, where there is more than one material being used in one vessel, and when material moisture content can change. The level switch is also good for applications when the bulk density is too low for a rotating paddle level switch. It can also detect granular material submerged in liquids of low viscosity, for example sand, gravel, or polyester chips in water.
Bulk Solid Density Min
1.8 lb/ft³
Electrical Connection
3/4 in NPT female Conduit with Screw Terminal block
Electrical Rating
5 A @ 230 Vac
Enclosure Ratings
IP66, NEMA Type 4X, Weatherproof
LED Indicators
External: Red LED; Internal: Green and Red LED’s
Materials
Aluminum
Materials, Wetted
316 Stainless Steel, Stainless Steel
Media Compatibility
Dry Powder
Operating Temperature, Max
140 °F
Operating Temperature, Min
-4 °F
Particle Size, Max
0.4 in
Power Consumption
4 VA
Pressure Limits
Up to 145 psi
Measurement Pressure Type
Gauge
Process Connection Size
1 1/2 in
Process Connection Type
NPT Male
Process Temperature, Max
176 °F
Process Temperature, Min
–4 °F
Response Time Note
Max Covered Probe: 2 s; Uncovered Probe: 3 to 7 s
Supply Power Note
90 to 265 Vac, 50/60 Hz; 24 Vdc
Supply Power Type
AC/DC
Supply Voltage
90 to 265 Vac
Switch Type
SPDT NO/NC, Selectable
Time Delay
2 to 20 s
Time Delay Note
Separate settings for covering and uncovering the probe. Adjustable from 2 to 20 s
Weight
5.5 lb
- Status indication with external LED switch indicator, and internal indicators for normal and alarm status
- No calibration required for quick and easy installation
- No mechanical moving parts with no routine maintenance required
- Unaffected by the dielectric constant of the sensed material, making it superior to a capacitance level switch for applications where the dielectric constant is too low, where there is more than one material being used in one vessel, and when material moisture content can change
- Vibrating fork design is ideal for low bulk density and low dielectric constant products, detecting products down to 1.8 lb/ft3 (30 g/l)
- Ideal for applications where the bulk density is too low for a rotating paddle level switch
- Adjustable sensitivity can be set to ignore lighter bulk density products and only detect heavier products, such as sand, gravel, or polyester chips in water
- Unit is not affected by vibration from conveying systems, motors, or the movement of material
- Mounted in any position and is available with factory built extensions for mounting on the top of the storage vessel
- Failsafe setting with output switch that can be set for NO or NC condition on loss of power
- Time delay prevents false alarms from material surges
- Universal power supply yields one model which works with 90-265 VAC and 24 VDC
