Dwyer TFLS - Manual

PROXIMITY CONTROLS
Phone: 219/879-8000 www.dwyer-inst.com
A DIVISION OF DWYER INSTRUMENTS, INC. Fax: 219/872-9057 e-mail: [email protected]
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
Series TFLS Tuning Fork Level Switch
Bulletin L-33
Specifications – Perfect for Sensing Low Bulk Density or Low Dielectric Materials
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
• 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 90 to 265 VAC
and 24 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.
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
3
(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: 90 to 265 VAC, 50/60 Hz; 24 VDC.
Power Consumption: 4 VA.
Enclosure: Aluminum, powder coated.
Enclosure Rating: Weatherproof, NEMA 4X.
Switch Type: SPDT.
Electrical Rating: 5A @ 230 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 seconds;
uncovered probe: 3 to 7 seconds.
Time Delay: Separate settings for covering and uncovering the
probe. Adjustable from 2 to 20 seconds.
EXTENSION
LENGTH
NONE
6 IN
12 IN
18 IN
24 IN
36 IN
48 IN
DIM
“A”
9-1/4 (234.95)
15-1/4 (387.35)
21-1/4 (539.75)
27-1/4 (692.15)
33-1/4 (844.55)
45-1/4 (1149.35)
57-1/4 (1454.15)
3/4 CONDUIT
CONNECTION
1-1/2 NPT 7/8
[22.23]
W/ EXTENSION
NO EXTENSION
“A”
4-7/32
[107.14]
7-5/16
[185.74]
8-5/16
[211.14]
“A”
Ø4-7/16
[112.73]
4-7/8
[123.83]
3-5/8
[92.08]
COVER
REMOVAL
4-7/32
[107.14]
8-5/16
[211.48]
7-5/16
[185.64]
SERIES TFLS TUNING FORK LEVEL SWITCH MOD TFLS- SERIAL: