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LTUM1 Series
Tuning Fork Level Switch
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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
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1. Models
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2. Wiring
Power supply is DC. Output is PNP / NPN. Please see Figure 1.
PNP wiring:
High (Max.) Mode: No. 1 pin (Brown) is connected to L-. No.3 pin (Blue) is
connected to L+. Output is connected to No. 2 pin (Black) , then connected
to L-. No. 4 pin (Yellow Green) goes to ground.
Low (Min.) Mode: number 1 pin (Brown) is connected to L-. No.2 pin
(Black) is connected to L+.
Output is connected to No. 3 pin (Blue), then connected to L-. No. 4 pin
(Yellow Green) goes to ground.
PNP wiring:
High (Max.) Mode: No. 1 pin (Brown) is connected to L+. No.3 pin (Blue) is
connected to L-. 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 L+. No.2 pin (Black) is
connected to L-. Output is connected to No. 3 pin (Blue) , then connected to
L+. No. 4 pin (Yellow Green) goes to ground.
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3. Fork Sensing Spot
LTUM1 fork sensing spot is shown as Figure 3 below. Considering testing
medium is water (S.G.=1 g/cm3) , sensing spot is at the fillister about 23mm
from the tip. If testing medium has S.G. lower than 1g/cm3, 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.
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5. Output Status
LTUM1 is equipped with two wires power supply. Relay output is connected in
two wiring power (L+/–) , which offers Min./ Max. modes according to different
pin numbers. When powered with 20 to 250、50/60 Hz Vac / Vdc, top of housing
would light up with blue LED.
Low (Min.) Mode: Tuning fork switch will be actuated 3 seconds after the
power is on. Relay is NO and red LED indication is off.
When tuning fork is covered by testing medium, vibration stops and relay
becomes NC. Red LED indication is on.
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 numbeR
Red LED indication is on.
Flashing red indicates abnormal: Possible causes overloads or short-circuit
load back, equipment malfunction or wear tuning fork probe.
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6. Installation
Horizontal Installation:
1. Can be applied in viscosity, powder and, liquid. Do not inst.( Figure 1)
2. When 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)
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Error
Cause
Solution
Power Supply indicator
(Green Light) is off and
the switch is not
conductive.
No power supply.
Power on or check the wiring
and repair.
Power doesn't meet the
specification.
Check the nameplate and
power 12 to 55 Vdc
The signal lamp is
normal and the switch
output is incorrect.
The control circuit wiring
is incorrect.
Check the wiring diagram
and 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/cm³ , the selected
model is not applicable
to use
Contact with the local sales
representative.
The tuning fork does
not sense the material,
but the switch indicates
it exists.
The tuning fork is stuck or
agglomerated by the
material.
Check the tuning fork and
remove the sediment.
7. Simple Troubleshooting
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M5733/0119
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