Dwyer Instruments PROXIMITY TFLS Series Specifications-Installation And Operating Instructions

Series TFLS Tuning Fork Level Switch
Specifications - Installation and Operating Instructions
By Dwyer
Series TFLS Tuning Fork Level Switch is ideal for level control of powders and
fine grained solids, especially those with a low bulk density. 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.
FEATURES/BENEFITS
• No calibration required
• Vibrating Fork Design: Great for low bulk density and low dielectric constant
products. Will detect products down to 1.8 lb/cu ft (30 g/l)
• Universal Power Supply: One model works from 80-260 VAC and 30 VDC
• Adjustable Sensitivity: Can be set to ignore lighter bulk density products and only
detect heavier products, such as sand in water
• Status Indication: External LED status indicator, and internal indicators for normal
and alarm status
• Failsafe Setting: Output switch can be set for Normally Open or Normally Closed
condition on loss of power
• Time Delay: Prevent false alarms from material surges
PROXIMITY CONTROLS
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
Ø4-7/16
[112.73]
4-7/8 [123.83]
SPECIFICATIONS
Service: Dry powder or bulk materials compatible with wetted materials. Can detect
bulk materials submerged in liquid.
Sensitivity: Minimum bulk density of 1.8 lb/ft (30 g/l), maximum particle size 0.4 in
(10 mm).
Wetted Materials: 316 SS.
Temperature Limits: Ambient: -4 to 140˚F (-20 to 60˚C); Process: -4 to 176˚F (-20
to 80˚C).
Pressure Limit: 145 psig (10 bar).
Power Requirement: 80-260 VAC, 50/60 Hz or 16-30 VDC.
Power Consumption: 1 VA.
Enclosure: Aluminum, powder coated.
Enclosure Rating: Weatherproof, NEMA 4X.
Switch Type: SPDT.
Electrical Rating: 7A @ 250 VAC.
Electric Connections: Screw terminals.
Conduit Connection: 3/4˝ female NPT.
Process Connection: 1-1/2˝ male NPT.
Weight: 5.5 lb (2.5 kg).
Indication Lights: External: red LED; Internal: green and red LED's.
Sensing Delay: (Maximum) covered probe: 2 s; Uncovered probe: 3 to 4 s.
Time Delay: Separate adjustable settings for covering and uncovering the probe,
5 to 25 s.
A DIVISION OF
DWYER INSTRUMENTS, INC.
3/4 CONDUIT
CONNECTION
3 [76.20]
3-5/8
5-3/4 [146.05]
[92.08]
6-13/16 [172.62]
COVER REMOVAL
Phone: 219-879-8000 www.dwyer-inst.com
Fax: 219-872-9057 e-mail: info@dwyermail.com
Bulletin L-33-1
1-1/2 NPT
7/8 [22.23]
"A"
Extension Length DIM "A"
None 9-1/4 (234.95)
6 in 15-7/8 (403.23)
12 in 21-7/8 (555.63)
18 in 27-7/8 (708.03)
24 in 33-7/8 (860.43)
36 in 45-7/8 (1165.23)
48 in 57-7/8 (1470.03)