Dwyer CTF - Manual

Model CTF Mini Tuning Fork Level Switch
Specifications - Installation and Operating Instructions
Bulletin L-CTF
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: [email protected]
SPECIFICATIONS
Service: Dry powder compatible with wetted materials. Can detect bulk materials
submerged in liquid.
Sensitivity: Minimum bulk solid density: 4.4 lb/ft
3 (70 g/l).
Wetted Materials: 304 SS.
Temperature 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.
Power Consumption: 10 mA @ 12 to 24 VDC; 0.5 W (max).
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).
The Model CTF Mini Tuning Fork Level Switch is an ideal choice for level control
of powders. The CTF incorporates a piezoelectric crystal that vibrates the fork at
its natural frequency. When the fork comes in contact with a 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. 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
may not be suitable, providing great versatility.
The Model CTF is easy to use with no calibration required and no mechanical
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)
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.
HEX1/5˝
1˝ NPT
3-15/16
[100.00]
1-3/16
[30.00]
4-9/64
[105.00]
Ø1-1/2
[38.00]
Figure 1 - PNP Output Connection Diagram
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)