Dwyer CTF User Manual

Model CTF Mini Tuning Fork Level Switch

HEX1/5˝

1˝ NPT

3-15/16 [100.00]

1-3/16

[30.00]

4-9/64

[105.00]

Ø1-1/2 [38.00]

Specifications - Installation and Operating Instructions

Bulletin L-CTF

he Model CTF Mini Tuning Fork Level Switch is an ideal choice for level control

f powders. The CTF incorporates a piezoelectric crystal that vibrates the fork at

ts natural frequency. When the fork comes in contact with a material, the vibration

i is dampened and the switch changes state. As the fork becomes free of material, the switch changes back to its normal state. The unit is not affected by vibration from conveying systems, motors, or the movement of material. Its compact size and DIN connection allow for application in places a larger tuning fork level switch

ay not be suitable, providing great versatility.

he Model CTF is easy to use with no calibration required and no mechanical

T moving parts, which means no routine maintenance. The CTF 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. Comes standard with a user friendly PNP/NPN configurable output.

FEATURES

• Compact size for applications where a larger tuning fork is not suitable.

• PNP/NPN selectable output modes

• DIN Connection

• Quality materials suitable for pharmaceutical and food processing applications

• Magnetic test point to test proper functionality of level switch

Electrical Connections:

To configure the switch for a PNP output, the following steps should be followed.

High (Max) Mode:

1. Connect the negative supply terminal N- to pin no. 1.

2. Connect the positive supply terminal L+ to pin no. 3.

3. Connect ground to pin no. 4.

4. To connect to the output signal of the switch, connect between pin no. 2 and the negative supply terminal N-. (See PNP connection figure)

SPECIFICATIONS Service: Dry powder compatible with wetted materials. Can detect bulk materials

submerged in liquid.

ensitivity: Minimum bulk solid density: 4.4 lb/ft

etted Materials: 304 SS.

emperature Limits:

Ambient: -40 to 140°F (-40 to 60°C); Process: -40 to 212°F (-40 to 100°C).

Pressure Limit: 600 psi (40 bar). Power Requirement: 12 to 55 VDC.

ower Consumption: 10 mA @ 12 to 24 VDC; 0.5 W (max).

P Enclosure: Aluminum, painted. Enclosure Rating: IP65. Switch Type: 3-wire PNP/NPN output. Electrical Rating: 350 mA (max) @ 12 to 55 VDC. Conduit Connection: Valve plug DIN 43650. Process Connections: 1˝ male NPT. Indication Lights: External red LED. Sensing Delay: Maximum covered probe: 1 to 3 seconds; Uncovered probe: 1 to

3 seconds.

Weight: 2.2 lb (1.0 kg).

Figure 1 - PNP Output Connection Diagram

70 g/l).

(

Low (Min) Mode:

1. Connect the negative supply terminal N- to pin no. 1.

2. Connect the positive supply terminal L+ to pin no. 2.

3. Connect ground to pin no. 4. To connect to the output signal of the switch, connect between pin no. 3 and the negative supply terminal N-. (See PNP connection figure).

To configure the switch for an NPN output, the following steps should be followed.

DWYER INSTRUMENTS, INC.

High (Max) Mode

1. Connect the positive supply terminal L+ to pin no. 1.

2. Connect the negative supply terminal N- to pin no. 3.

3. Connect ground to pin no. 4.

4. To connect to the output signal of the switch, connect between pin no. 2 and the positive supply terminal L+. (See NPN connection figure)

Low (Min) Mode

1. Connect the positive supply terminal L+ to pin no. 1.

2. Connect the negative supply terminal N- to pin no. 2.

3. Connect ground to pin no. 4.

4. To connect to the output signal of the switch, connect between pin no. 3 and the positive supply terminal L+. (See NPN connection figure)

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

nstallation

he following steps should be followed for both horizontal and vertical installation.

Horizontal Installation

Level switch can be installed in powder and liquid. Do not install near substance inlet.

Checking the Status of the Output

epending on the configuration of the output defined by the user (PNP/ NPN) and the

ode of operation (Max/ Min), the output status indicated by the red LED on the top

f the housing will vary.

Low (Min) Mode: The tuning fork level switch starts detection 3 seconds after power is connected. The switch will remain open and the red LED indicator will remain off until covered by a medium. Once the tuning fork is covered by this medium, the vibration will cease, the switch will close, and the red LED will turn on.

igh (Max) Mode: The tuning fork level switch starts detection 3 seconds after power

s connected. The switch will remain closed and the red LED indicator will remain on

i until covered by a medium. Once the tuning fork is covered by this medium, the vibration will cease, the switch will open, and the red LED will turn off.

Magnetic Testing of Functionality

Once tuning fork level switch is installed and powered, the CTF offers a magnetic switch test to check functionality. Depending on the proximity of magnet in relation to the magnetic test point, the switch will change from open to closed or closed to open, and the red LED will switch on or off depending on the mode configured. The purpose of the test is to confirm the wiring and functionality are correct.

Figure 2 - NPN Output Connection Diagram

Figure 3 - Max/Min Mode Output Status Indication

Figure 5 - For proper operation, do not install near substance inlet.

When installed, the tuning fork position hole on DIN plug must be faced in the downward direction. Fail to do so may damage the tuning fork.

Figure 6 - Position hole on DIN plug must be installed facing downward.

Vertical Installation

When the level switch is installed in a a liquid, the opening of the two fork blades is to be so the liquid flows between the blades.

Figure 7 - Vertical installation in a liquid’s flow stream.

Just as with horizontal installation, do not install the tuning fork near the substance inlet.

Figure 8 - Do not install tuning fork near substance inlet.

Figure 4 - Magnetic Test Diagram

MAINTENANCE/REPAIR

Upon final installation of the Model CTF, no routine maintenance is required. The Model CTF 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