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3. Fork Sensing Spot

 

TF280-N/TF280-P fork sensing spot is shown as Figure 3 below.  Considering 
testing medium is water (S.G.=1 g/cm

3

) , sensing spot is at the fillister about 

23mm from the tip.  If testing medium has S.G. lower than 1g/cm

3

, sensing spot 

would be above the fillister.  In contrast, sensing spot will be below the fillister. 

 

       

        

 

 
 

4. Magnetic Test

 

After the switch is installed and powered, magnetic test function can be 
performed accordingly. The testing point is marked on the housing label. User 
holds the magnet and moves it close to testing point, the output status will switch 
from NO. to NC. or NC to NO. and red LED would switch ON or OFF while fork 
continues to vibrate. When magnet is pulled away from the testing point, the 
output status and red LED would return as default while fork continues to vibrate. 
The purpose of testing is to confirm the wiring and functioning are correct. 

 

Summary of Contents for TF280-N

Page 1: ...1 TF280 N TF280 P Tuning Fork Level Switch ...

Page 2: ...2 ...

Page 3: ...3 Contents 1 Models 4 2 Wiring 5 3 Fork Sensing Spot 6 4 Magnetic Test 6 5 Output Status 7 6 Installation 8 7 Simple Troubleshooting 9 ...

Page 4: ...4 1 Models ...

Page 5: ... is connected to N No 2 pin Black is connected to L Output is connected to No 3 pin Blue then connected to N No 4 pin Yellow Green goes to ground NPN Output High Max Mode No 1 pin Brown is connected to L No 3 pin Blue is connected to N Output is connected to No 2 pin Black then connected to L No 4 pin Yellow Green goes to ground Low Min Mode No 1 pin Brown is connected to N No 3 pin Blue is connec...

Page 6: ...Test After the switch is installed and powered magnetic test function can be performed accordingly The testing point is marked on the housing label User holds the magnet and moves it close to testing point the output status will switch from NO to NC or NC to NO and red LED would switch ON or OFF while fork continues to vibrate When magnet is pulled away from the testing point the output status and...

Page 7: ...rk is covered by testing medium vibration stops and relay becomes NC Red LED indication is off High Max Mode Tuning fork switch will be actuated 3 seconds after the power is on Relay is NC and red LED indication is on When tuning fork is covered by testing medium vibration stops and relay becomes NO Red LED indication is off Flashing red indicates abnormal Possible causes overloads or shortcircuit...

Page 8: ...n installing the product The position hole plug must be upward direction If not incorrect installation could be damage the product Figure 2 Figure 1 Figure 2 Vertical Installation 1 Opening of the two fork blades is to be as the flow direction Figure 3 2 Do not install near substance inlet Figure 4 Figure 3 Figure 4 ...

Page 9: ...d correct it The wiring for high low level is incorrect Check the wiring and repair Output Indicator Red Light is flashing The tuning fork is worn deformed or demaged Contact with the local sales representative The tuning fork sensed the material but the switch indicates it does not exist Liquid density sensed 0 7g cm the selected model is not applicable to use Contact with the local sales represe...

Page 10: ...10 ...

Page 11: ...11 M5733 0119 ...

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