Dwyer Instruments PROXIMITY TFLS Series Istruzioni per l'installazione e il funzionamento

Series TFLS Tuning Fork Level Switch

Specications - Installation and Operating Instructions

Bulletin L-33-1

Series TFLS Tuning Fork Level Switch is ideal for level control of powders and

ne 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

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.

3/4 CONDUIT

CONNECTION

1-1/2 NPT

7/8 [22.23]

3 [76.20]

"A"

5-3/4 [146.05]

6-13/16 [172.62]

3-5/8

[92.08]

COVER REMOVAL

4-7/8 [123.83]

Ø4-7/16

[112.73]

Extension Length DIM “A”

None

6 in

12 in

18 in

24 in

36 in

48 in

9-1/4 (234.95)

15-7/8 (403.23)

21-7/8 (555.63)

27-7/8 (708.03)

33-7/8 (860.43)

45-7/8 (1165.23)

57-7/8 (1470.03)

PROXIMITY CONTROLS

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.

Phone: 219-879-8000

Fax: 219-872-9057

www.dwyer-inst.com

e-mail: [email protected]

A DIVISION OF

DWYER INSTRUMENTS, INC.

By Dwyer

OPERATING PRINCIPLE

The TFLS incorporates a piezoelectric crystal that vibrates the fork at its natural

frequency, 85 Hz. 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.

INSTALLATION

Unpacking

Remove the TFLS from the shipping carton and inspect for damage. If damage is

found, notify the carrier immediately.

Mounting Location

The TFLS is rated for industrial environments with few restrictions, however certain

considerations must be made to ensure for optimal sensing and extended operational

life.

• The process temperature and ambient temperature must be with- in the specied

limits for the instrument.

• It is recommended to use a suitable material to protect and seal the process

threads such as TFE tape.

• Position the tines using a wrench on the hexagonal ats above the process

connection. Do not position by turning the housing.

• The probe must be located away from tank inlets or chutes where material may fall

on the probe during lling or emptying (Figure 1, No. 2). If this is not possible a

bafe may be installed above the probe to protect it from falling material (Figure

1, No. 3). The bafe must be installed a minimum of 8” (200 cm), see dimension

A in Figure 1, above the probe so that material will not become packed between the

probe and the bafe.

• For mounting horizontally install with conduit entry facing down so condensate

does not enter the enclosure.

• For mounting horizontally position the tines vertically, narrow edges up, so that

material ows freely through them. The TFLS is designed so that if the conduit

opening is pointed down the tines will be in the proper orientation. No. 6 in Figure

1 shows incorrect mounting, No. 7 correct mounting.

• For mounting horizontally with materials that may stick to the tines it is recommended

to mount the probe angled down so that material slides off easily (Figure 1, No. 7).

• The tines should not be bent, shortened, lengthened, or altered in any way (See

Figure 2).

• For top mounting the tines can be mounted in any position (Figure 1, No. 1).

• When using mounting nozzles, make sure the length is proper so that the tines

extend far enough into the vessel to vibrate free of material buildup on the vessel

wall. Also make sure the nozzle does not extend further than necessary into the

vessel (Figure 1, No. 5).

Figure 1: Installation guide

Figure 2: Fork protection

DO NOT BEND

DO NOT SHORTEN

OR EXTEND

Wiring

Note: Installation must be made in accordance with National Electric Code and local

codes and regulations. When shing wire through the conduit connection do not allow

the wire to touch or press on components on the boards. Damage to the circuitry may

result.

The TFLS has a 3/4˝ NPT female conduit connection. The conduit connection must

be made such that condensation is not allowed to enter the housing. If nonmetallic

conduit is used, the protective ground may be connected to the external ground

connection screw.

Strip 1/4˝ of insulation from wires. Connect the power wires to terminals 4 and 5 if

type of power supply may be used at a time, do not connect both AC and DC power

simultaneously. Connect control lines to the relay contact terminals 6, 7, and 8. See

Figure 3 for terminals layout.

CONTROLS AND INDICATORS (See Figure 4)

Time Delay Potentiometers — These controls select the delay times from 5 to 25

seconds from the detection of a level change to the output. There is one setting for wet

delay and one for dry delay.

Dip Switch — This two section switch selects the external LED status and failsafe

mode and sensitivity for different types of material.

Normal LED — Green. This LED is illuminated when the unit is powered and the fork

does not sense any material.

Alarm LED — Red. This LED is illuminated when the relay is powered by the fork

sensing material. It is affected by the delay setting.

External LED — Red. This external LED is illuminated in conjunction with the fork

being covered or uncovered.

SETUP AND CALIBRATION

1. Fail Safe Mode Selection: The relay will always be off when the power fails. In this

case the contacts identied as normally open will be open. The fail safe switch \

selects whether the normally open contacts are open or closed when the probe is

uncovered. There are two options for the failsafe condition that are selected by the

RELAY DIP switch (See Figure 4). Selecting MAX will force the relay contacts to be

open when the probe is uncovered and the NORMAL green LED to be on. Selecting

MIN will energize the relay (closed) when the probe is uncovered and the ALARM

red LED to be on.

EXTERNAL

LED

16... 30 V

80... 260 AC

50/60 HZ

L1 N

12 3456 78 910

RELAY CONTACTS SHOWN FOR

ALARM CONDITION OR POWER OFF.

ALARM STATUS

LED (GREEN)

LARM STATUS

LED (RED)

FAILSAFE/SENSITIVIT

WET/DRY DELAY

Figure 4: Switches and LED’s

Figure 3: Terminals

Always install or service this device with the power off and where

required install a disconnect lockout.

WARNING

For power line connections use NEC Class 1 wiring rated 60°/75°C.

Use 12 to 20 AWG copper only for line and load connections. Strip

the wires 1/4˝.

CAUTION

PROXIMITY CONTROLS

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.

Phone: 219-879-8000

Fax: 219-872-9057

www.dwyer-inst.com

e-mail: [email protected]

A DIVISION OF

DWYER INSTRUMENTS, INC.

2. Sensitivity Selection: The sensitivity selection adjusts the fork sensitivity to

material bulk density. The more dense the material, the lower the sensitivity

needed. After installing the probe and making all electrical connections, set the Fail

Safe Selection switch to the MAX position. Set both the wet and dry time delays to

their minimum by rotating them counter-clockwise to the end position. Adjust dip

switch sensitivity to normal (See Figure 4). If there is no material in the tank then

the green LED will be illuminated. Fill the tank so that the fork tines are covered

by material. If the green LED turns off and the red LED turns on then no adjustments

are necessary. If the green LED stays on adjust dip switch sensitivity to sensitive,

the green LED goes out and the red LED comes on. Setting is completed.

3. Time Delay Selection: The time delay is the programmed time between when the

probe senses the presence or absence of material and when the relay changes

state. A time delay is good for applications that could have false or rapid pulsing of

level indications from sloshing or agitated material. Choose a delay setting

appropriate for the specic application. There are two potentiometers for adjusting

the delay time. They are labeled wet and dry, delay, depending on material, and

sets the delay time between when the probe is covered and when the switch

changes state. Adjust the time delay potentiometers by turning them fully counter-

clockwise to their end position. This setting is 5 second delay. To then set a delay

time turn the potentiometer clockwise to the desired time setting. The delay can be

set anywhere from 5 to 25 seconds.

TROUBLE SHOOTING

If the instrument fails rst check that the wiring connections are correct and that the

set up is correct for the application. Next, check to see if the tines vibrate when free

of material.

MAINTENANCE

Upon nal installation of the Series TFLS Tuning Fork Level Switch, no routine

maintenance is required. A periodic check of the system calibration is recommended.

The Series TFLS is not eld serviceable and should be returned if repair is needed

(eld repair should not be attempted and may void warranty). Be sure to include a

brief description of the problem plus any relevant application notes. Contact customer

service to receive a return goods authorization number before shipping.

Condition Relay Status Probable Cause

Probe Covered

Red LED Off

Green LED Off

Terminals 7 and 8 Open

Relay De-energized

No power supplied

Probe Covered

Red LED On

Green LED Off

Terminals 7 and 8 Open

Relay De-energized

Voltage too low

Material too light

Material has formed cavities

Vibration of vessel wall at 85 Hz

Probe Uncovered

Red LED Off

Green LED On

Terminals 7 and 8

Closed

Relay Energized

Heavy material deposit on fork

Fork Damaged

Vibration of vessel wall at 85 Hz

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