Instruction Manual
LG-100 Series Pointer-type Liquid Level Gauge

Thank you for choosing our product.
Our liquid level gauge is designed and produced, based on the specification of installation andmeasurement at the customer’s site.
Please read this instruction manual thoroughly to install and use the liquid level gauge safely.
*The illustrations in this instruction manual is a schematic presentation and may be different from the realshape.
Also, each adjunctive specification of this liquid level gauge may be different. Please read this instruction
manual along with the specification sheet attached to this liquid level gauge at the time of delivery (Thestatement in the specification sheet takes priority in case that it’s different between in this instruction manualand each specification).

Contents
1.

Precautions
1.1. Marks and meanings··············································· 2
1.2. Detailed precautions ··············································· 2
2. Summary of product2.1. Model code ··························································· 32.2. Detection method ··················································· 42.3. Installation ···························································· 52.4. Contact rating ························································ 5
3. Part names ······································································ 6
4. Installation procedure
4.1. Float installation ····················································· 64.2. SG type installation················································· 74.3. S type installation ··················································· 84.4. S type installation (Wired weight) ······························· 94.5. SS type installation ················································· 10
4.6. MJ type installation ················································· 11
4.7. Installation on tank side (SL type) ······························ 12
5. Wire connection································································ 13
6. Adjustment
6.1. Scale plate indication adjustment ······························· 14
6.2. Contact adjustment (LT connection) ··························· 14
6.3. Contact adjustment (XT connection) ··························· 15
6.4. Indication and connection adjustment
at LB (variable) connection································· 16
6.5. Transmission value adjustment ································· 17

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1. Precautions
Please read the following precautions thoroughly and ensure the precaution in this instruction manual
when installing and wiring this level gauge.
1.1. Marks and meanings

DangerWarning

Indicates a potentially hazardous situation which could result in serious result such as
death or fatality.
Indicates a potentially hazardous situation which may result in injury to the user or
damage other properties.
Indicates necessary matters to use the product.

Caution
1.2. Detailed precautions
The following are especially important for the safety. Please be sure to read them before installing
the level gauge.
Mark

CautionMeaning
Check the specification andproduct when receiving.

DetailCheck on the specification sheet or name plate.
Malfunction will occur with missing parts or different
specification.
This level gauge is a precision measuring equipment.
Please avoid giving a shock since it may change themechanism inside.
Please do not install the level gauge alone since some ofthe places require two tasks at the same time.
There is a possibility of getting injured without theequipment for safety. Especially, plenty of attention isneeded in dealing with the stainless tape used for this level
gauge since it’s extremely sharp.

Do not give a shock to thelevel gauge and theWarning
attached parts.
Do not install the level
Warning gauge alone.
Put on gloves (made ofleather or rubber), hard hat,protective shoes, and otherDangerrequired equipment forsafety.
Do not wire the level gauge There is a possibility of electric shock or equipment
Dangerin hot line state.
damage if it’s wired during energization.
Do not take the stainless
The stainless tape not only causes damage andWarning tape in and out suddenly.
malfunction of the level gauge but also causes injury.
Do not take off the stainless There is a possibility of causing injury as well as
tape pulled from the levelmalfunction by damage of the stainless tape.
Warning
gauge.
Do not throw and drop the
The float is damaged and malfunction will occur on the
Warning float.
level gauge.
Do not apply heat to the
The electric parts such as a switch part, potentiometer, andelectric parts inside theconverter will not operate normally if heat is applied.
Warning
level gauge.
Perform regular
Regular maintenance and inspection are recommended formaintenance andthe performance retention of the level gauge.
Cautioninspection.
※The result may correspond to [Danger] according to the circumstances even though the mark is [Warning].

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2. Summary of productThis is the mechanical liquid-level gauge with harnessing the property of the float which follows
up the liquid level with versatility such as the optional addition of various transmission outputs,
non-voltage contact or potentiometer output and DC4-20mA output, by a micro switch and cam.
2.1. Model codeLG□-1□□□-□□-□Method
Detection method (Refer to 2.2.)
Mechanism of connectionLT
Non variable contact (±10% adjustable)
XT
Non variable contact (±10% adjustable)
LB
Variable setting contact (Front side/±25% variable)
Contact output
N/A Without contact output
1～8 A number of contact outputs
Additional specification
N/A Normal
U
With U type seal metal
Z
With Anti vibration
Measurement method
Tank top installation, tape, direct connection with float
0
Tank top installation, tape, magnetic coupling with float
1
Tank side installation, tape, direct connection with float
2
Tank side installation, tape, magnetic coupling with float
2M
Transmission output

0
2
3

N/A
0-500Ω
DC4-20mA

Pressure-resistant and explosion-proof
blank Water-proof typeE
Explosion proof type d2G4
Model code

Explosion resistance test identification number

Type of output

LGE-3

T19662

Contact output

LGE-L-R

T58374

Transmission output

Maximum number of contact
outputs by mechanism ofconnection

Mechanism of connection
Drip-proof type
Explosion-proof type

LT
8※4.
6※4.

XT
4

LB
2

※ 3.

※ 3.

※1. Use the explosion proof packing gland (not included) for the external wiring connection of pressureresistant and explosion-proof product.
※2. The contact and Transmission cannot be output at the same time for the pressure-resistant andexplosion-proof product※3. XT contact and LB contact do not have explosion-proof type.
※4. In the case of 1c contact, the maximum number is 4 for drip-proof type and 3 for Explosion
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2.2. Detection method
Pointer-type Liquid Level Gauge detects liquid level by a float. There are various type of detection
methods according to measurement target, workability, and shape. The following are about features ofthe detection method used for the Pointer-type Liquid Level Gauge.
2.2.1.

SS typeIt’s the most typical detection method. It adapts various types of liquid with good following
capability to a change in the liquid level and is suitable for suspended solids and attachedviscosity liquid. Although there is no special limit for the measurement length, this method isoften applied in the case of measuring relatively long length. It uses the container wired inside
as a float guide. It can be newly installed with easy construction and less equipment on thecontainer side, but the work inside the container will occur when taking off the float in the caseof maintenance etc. It’s used for relatively large vertical cylindrical tank.

2.2.2.

Applicable float
NormalΦ240x70H
OptionΦ178x75H,Φ200x50H,Φ320x70H,Φ350x160H
SG typeIt’s the most appropriate detection method for the liquid with waves and currents and external
impact is expected. It can insulate the effect of flying objects as well as waves and currents.
Although there is no special limit for the measurement length, the pipe used for the float guide
should be installed vertically since the inside is smooth. We recommend using seamless pipe.
The guide pipe construction brings higher burden than the SS type, but the maintenance isgood since the float can be taken off from the outside of the container. It’s often used for thesmall tank or the tank with an agitator.

2.2.3.

Applicable float
NormalΦ96x150H
OptionΦ72x100H,Φ120x120H,Φ140x120H,Φ178x75H
S typeIt’s the detection method with inserting the float guide fixed on the gauge flange. It’s easy toinstall and it can be installed even though the liquid is still in the container. Also, it requires
less equipment on the container side since the attached nozzle can apply to relatively small
objects. Although the float is set horizontally with good following capability to a change in theliquid level, the usable liquid and models are limited due to the float size limitation. Also, it’s
not suitable for the liquid with vortex and currents inside the container such as agitator. Since
it’s often chosen for relatively small container, it’s mostly used with the tank top type. The float
guide is used with a combination of wire rope and weight in case the measurement length islonger than 2m. It requires confirming the use conditions well, even though it has goodworkability and maintenance.

2.2.4.

Applicable float
NormalΦ50x300L
OptionΦ50x250L,Φ40x300L,Φ50x400L,Φ33x350L
MJ (MH) type
It’s the detection method which transfers the change of position by magnet without connecting
the float and tape directly. It’s most suitable when preventing the diffusion of volatile liquid orsmell since it can block the environment inside the tank from the gauge. Also, it can be applied
to high pressure of up to 3.0MPa with the spherical float. It’s not suitable for the long length
measurement due to product size and workability since it needs the guide pipe passed throughmagnet. Also, it’s not suitable for the liquid with floating objects, since it inhibits the float friction.
It’s mostly used for the measurement of fuel oil, solvent, and medicinal solution. Although thewetted part of the normal model is SUS, it can be used for the corrosive liquid with rubber
lining type as a special support

Applicable float
Normal Φ240x70H
Option Φ320x70H,Φ 180x100H,SΦ 178(spherical shape/MH type),SΦ 226(spherical shape)※These illustrations are schematic presentation for the detection method and may bedifferent from the real shape of the level gauge.

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2.3. Installation
The following are the installation methods as well as the way to install the level gauge to a tankwith the detection methods on previous page, and the features of the installation methods which
is used for the Pointer-type Liquid Level Gauge.

2.3.1.

Tank side installation
It’s the installation method generally used for thelarge tank on the ground.
It doesn’t require climbing up on the tank in order tocheck the instrument reading of the level gauge.
Set the route pipe of the measurement tape from the
top of the tank, and set the indicating instrument ateasily viewable place.

2.3.2.

Installation with rising edge of piping (SL type)
Set the route pipe of the measurement tape from the
top of the tank, and set the indicating instrument ateasily viewable place, in much the same way as thewall support installation at the tank side.
SL type is especially used for setting the indicating
instrument above the floor in case the tank is set
under the floor such as corridor.

※These illustrations are schematic presentation for the detection method and may bedifferent from the real shape of the level gauge.
2.4. Contact rating
Contact mechanism
LT

XT

LB

rated voltage
AC125V
AC250V
DC125V
DC250V
DC110/125V
DC220/250V
AC110/125V
AC220/250V
DC24 / 30V
DC110/125V
DC220/250V
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rated current
15A
15A
0.6A
0.3A
10A
3A
5A
3A
4A
0.4A
0.2A
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3. Part names(Refer to the specification drawing, for Installation method, external dimensions and materials.)

Figure 1. Part names
4. Installation procedure
4.1. Float installation (common to all types)
Pull out the tape from under the installation flange of the level gauge main unit (the orderdepends on each detection and installation type), connect the joint hook at the end and thefloat ring, and joint them by closing the hook with a tool like nipper. Confirm that they do notcome off easily.

Figure 2. Float and tape joint
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4.2. SG type installation
Install the float beforehand.
4.2.1. When using gasket, set it to the mounting seat of the level gauge before suspending
the float in the tank.
4.2.2. Carry the level gauge main unit and the float above the mounting seat, and suspend
the float slowly into the tank by controlling the tape by hand (Be careful not to crease
the tape).
4.2.3. Fix the level gauge with fastener components which is appropriate to installation.

Figure 3. SG type

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4.3. S type installation
4.3.1. Assemble the wetted part of the level gauge. (Refer to Figure 4). Screw two guide railswith nuts to the bottom side of the level gauge flange, and fix them by re-torquing thenuts.
4.3.2. Pull out the tape by holding the hook from the bottom side of the level gauge flange.
Joint it by passing the hook through the float ring. Close the hook with a tool like nipper
not to come off from the ring (Refer to Figure 2).
4.3.3. Pass the float guide ring through the guide rail with attention not to twist the tape.
4.3.4. Insert the stopper at the end of the guide rail, and fix with two M3 screws. Afterassembling, confirm that it operates normally by holding and moving the float up anddown.
4.3.5. When using a gasket, set it to the mounting seat beforehand, insert the assembled
wetted part from the mounting seat by rotating the float as shown in the Figure 5-A,
and fix the level gauge flange at the mounting seat by designated fastener component
to finish the installation.

Figure 4. Wetted part assembly

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4.4. S type (Wire weight type) installation
4.4.1. Assemble the wetted part of the level gauge. (Refer to Figure 5-B). Pass through thewire clip, pass one of the guide wire edge through one of the two weight hanging bolts
at the bottom side of the level gauge flange, and pass it through the same wire clip
again, then fix the wire and wire clip with torquing wire clip screw (M3 cross-recessedscrew).
4.4.2. Pass the edge of unfixed guide wire through [Float guide ring (only one side)]→[Bothsides of weight guide ring]→[Guide ring (which was not used before)]→[Wire clip],then at the end, pass it through the other side of weight hanging bolt. At this time, finetune the guide wire in accordance with the measurement length and fix with the wireclip.
4.4.3. Pull out the tape by holding the hook from the bottom side of the level gauge flange,
and joint it with the float ring. Close the hook with a tool like nipper not to come offfrom the ring (Refer to Figure 2).
4.4.4. Install the level gauge. Set a gasket beforehand if it’s needed. Put the weight from themounting seat into the tank. Let it down by inches carefully with controlling the guidewire by hand. After letting it down, confirm that the guide wire has tension (tensile
force) due to the weight and there is no cross or twist on two guide wires.
4.4.5. Insert the assembled wetted part from the mounting seat by rotating the float as shownin the Figure 5-A. Hold the tape by hand and let it down like reeling out by inches
carefully
4.4.6. Let the float down to the liquid level or the weight height and fix the level gauge main
unit to the mounting seat with designated fastener component by paying attention not
to damage the tape to finish the installation.

Figure 5. S type installation method – Wire weight assembly

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4.5. SS type installation
4.5.1.

Float installation procedure
There are two ways for float installation. Select one of these in accordance with thesite status.
Pass through the float guide ring at the time of the guide wire construction.
Open the float guide ring and pass through the guide wire after the guide wire
construction.
※.The guide ring is wound like a reel. Open the ring in the direction where the guidewire passes in order to widen the gap, turn 90° and stand upright the float at thisstatus and pass the guide wire through it, then get back the float as if to lay it down.
Put the opened guide ring to the former state with a tool.

4.5.2. Guide wire construction (the same way for both)
Check the guide installation position at the bottom of the tank (Place the sidewith a hole for the guide wire of the bottom piece just below the center of thesocket for the guide stopper).
Screw the guide stopper into the socket and take off the cap and nut1.
Pass the guide wire through the tension shaft, insert into the tank, and fix to thebottom piece.
Pull and tighten the guide wire from the tension shaft. Pull out the guide wirefrom the slit of the tension shaft laterally, install the nut1, and fix the guide wireby tacking with nut1 and nut2.
Torque the nut3 about 3-4 cm in the direction of the spring pressure.
Confirm that the guide wire is set parallel without looseness. Adjust again if
there is looseness. Trim off the guide wire out of the tension shaft by leaving
about 5-10cm in case the guide wire has extra length after adjusting, and put
the cap.

Figure 6. Guide wire installation
4.5.3.

Install the level gauge main unit. Pull out the tape from the level gauge by holding thetape hook, and connect to the float inside the tank (Refer to Figure 2). Set the tapewithout twisting or bending. Fix the level gauge main unit by designated fastenercomponent to finish the installation.
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4.6. MJ type installation
4.6.1. Take the tape hook from the level gauge main unit and connect the hanging magnet.
Connect the tape hook not to come off in the same manner as the float connection.
4.6.2. Set the gasket to the mounting seat of the level gauge, and insert the float guide pipe
into the tank. Do not fix the flange of the guide pipe to the mounting seat at this time.
4.6.3. Take off the stopper at the edge of the float guide pipe in the tank with the nut, and set
the float by passing it through the guide pipe. Install the float with its side of the caution
face plate upside and fix the stopper with a nut.
4.6.4. Install the gasket to the flange of the float guide pipe. Insert the hanging magnet
connected with the level gauge into the float guide pipe, and let it down to the float
level slowly by reeling out the tape by hand.
4.6.5. When the hanging magnet comes close to the float, it doesn’t descent any more due
to magnetic repulsion. Pull up the tape about 10-15cm from this level and fall it swiftly.
Set the magnet in the float and the hanging magnet attracting each other through thearea where they are repulsive.
4.6.6. Check they are jointed normally. Pull the tape lightly. The connection is correct if
resistance is stronger than the time of letting the hanging magnet down.
4.6.7. Install the level gauge main unit. Set it to the flange of the float guide pipe without
twisting or bending, and fix it with designated fastener component to finish the
installation.

Figure 7. MJ (MH) type installation
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4.7. Installation on tank side (SL type)
4.7.1. Finish the installation to the tank by the detection method beforehand. Prepare a string(textile and easy to tie) longer than the whole length of the route piping where the tapeof the level gauge passes through.
4.7.2. Arrange the guide pipe, 90°elbow, and the union at the designated position, andassemble them. Refer to the corresponding specification figure since the assembly
parts may be different depending on the specification. After assembling, open the
90°elbow.
(We recommend the installation of piping, dividing it by the part separated by union
coupling, not at one time.)
4.7.3. Pass through the string from the 90°elbow to the pipe on the tank side and pull out tothe level gauge attaching portion, then tie the end of the string to the tape hook of thelevel gauge. Insert the end of untied string into the tank. Pull the string from the tankand pull and pass the tape hook through the pipe. Check that the tape has no twist or
bend from the 90°elbow, then connect the tape hook to the float (Refer to Figure 2).
After finishing the connection, remove the string from the tape hook.
4.7.4. Install the level gauge main unit to the pipe. Connect the union by paying attention not
to rotate the level gauge main unit more than 90°, then the installation is finished.

Figure 8. Installation on tank side

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5. Wire connection

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6. Adjustment
Although this level gauge has already been adjusted before shipping, adjust with the following procedure
if it’s needed.
※ Actual liquid level should be grasped by measurement bar beforehand in either case
6.1 Scale plate indication adjustment
6.1.1. Scale plate indication adjustment [LT contact is in common (except for Transmission+ contact type)]
Open the level gauge scale plate, loosen the set screw, then set the indication onto
the actual liquid level (Figure 9-a). Re-torque the screw to close the level gauge scale
plate and finish adjusting.
6.1.2. Scale plate indication adjustment [LT and XT contacts are in common (including thetransmission type)]
Take off the adjusting cap in front of the level gauge, and adjust the level gauge
indicator to the actual liquid level or the value of the receiving instrument with thepotentiometer adjustment shaft (Figure 9-b).
Use a flathead screwdriver for adjusting.

Figure 9. Scale plate indication adjustment
6.2. Contact adjustment (LT connection)
Contact is adjusted with reference to the value of the level gauge scale plate indication. Confirm
that the actual liquid level and the indicator are the same, and adjust the scale plate indication
beforehand if it’s different.
6.2.1. In order to specify the indicator arbitrarily, take off the transmitter cover and terminalbox cover, and set space between the level gauge flange and the mounting seat at
the tank so as to operate by hand directly (It’s not needed in case the arbitrary
operation is available).
6.2.2. Confirm the adjusting part with the contact identification attached on the micro switch
assembled to the receiver on the back of the level gauge (Figure 10).
6.2.3. Loosen the screw at the confirmed micro switch and cam plate (just loosen the retorquing). Adjust the level gauge contact to indicate the desired level.
6.2.4. While it indicates the adjusting point, control the cam plate with loosened screw
manually to the position where the switch works, and fix the cam plate at the position
where the switch works.
6.2.5. While confirming the performance 2-3 times repeatedly along with the operation
direction, fine-tune it if it’s needed. Connect a buzzer or a tester and carry out the final
check. Get back each part to finish the adjustment.

Figure 10.LT contact adjustment
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6.3. Connection adjustment (XT connection)
Contact is adjusted with reference to the value of the level gauge board indication. Confirm thatthe actual liquid level and the indicator are the same, and adjust the board indication beforehand
if it’s different.
6.3.1.

6.3.2.

6.3.3.

6.3.4.
6.3.5.

In order to specify the indicator arbitrarily, take off the transmitter cover and terminalbox cover, and set space between the level gauge flange and the mounting seat at
the tank so as to operate by hand directly (It’s not needed in case the arbitrary
operation is available).
Take off the transmitter cover on the back of the level gauge. Confirm the adjusting
part with the contact identification attached on the micro switch assembled to thereceiver on the back of the level gauge, press adjusting gear B in the direction of anarrow, and release the fit with adjusting gear A, in order to control the cam manually(Figure 11).
Confirm the position of the micro switch and cam, and adjust the contact to operate at
the arbitrary position by checking the indicated position on the level gauge main unit
scale.
Fit released adjusting gear A and B with inverse process.
(※ Confirm it’s assembled with the appropriate fit of gears.)
While confirming the performance 2-3 times repeatedly along with the operation
direction, fine-tune it if it’s needed. Connect a buzzer or a tester and carry out the final
check. Get back each part to finish the adjustment.

Figure 11. XT contact adjustment

Figure 12. Operation direction of cam and switch
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6.4. Indication and connection adjustment at LB (variable) connection
Contact is adjusted with reference to the value of the level gauge scale plate indication. Confirm
that the actual liquid level and the indicator are the same, and adjust the scale plate indication
beforehand if it’s different.
6.4.1.

Scale plate indication adjustment (LB contact)
Remove the front cover, and adjust the indicating needle to the actual liquid level
confirmed beforehand by putting the flathead screwdriver at the slot. Keep the front
cover open when continuing to adjust the contact.

6.4.2.

Contact adjustment
Remove the front cover. One adjustment shaft is assigned to one contact. In thecase of the 2LB (two contacts), see the following.
Lower limit of contact indicator: The adjustment shaft on the observer’s leftof the front side of the level gauge.
Upper limit of contact indicator: The adjustment shaft on the observer’s rightof the front side of the level gauge.
Control the corresponded adjustment shaft with a flathead screwdriver, and adjust
the indicator to the contact operation position on the indicator scale plate. Whentesting the contact, connect a buzzer tester to the terminal block and check theoperation. Refer to page 14 about the specification of the wire connection. Close thecap and the front cover.

Figure 13. Adjustment of LB contact

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6.5 Transmission value adjustment
Check the actual measurement value and the level gauge main unit indicator. If the indicatoris different from the actual measurement value, adjust it in the following way. In each case,adjust the scale plate indicator of the level gauge first.
6.5.1 Potentiometer is assembled on the front side (Transmission + site-directed type)
Remove the adjusting cap on the level gauge main unit front side, adjust thepotentiometer shaft to the value of the external receiver, and adjust the indicatingneedle position of the level gauge main unit (Use a flathead screwdriver (-) for
adjusting) (Figure 9-b). The proper angle of adjustment shaft is the position that thelevel gauge main unit indicator and the receiver indicator are the same.
6.5.2 Potentiometer is assembled on the back side (Transmission + contact + site-directed
type/ Pressure-resistant and explosion-proof type)[1] Adjust based on the main unit scale plate (site) indicator
Take off the transmitter on the back side of the level gauge main unit, and adjust thepotentiometer shaft as follows (Use a flathead screwdriver (-) for adjusting).
Upward error (upper limit graduation side) occurs on the level gauge main unit
indicator (the side of the upper limit).
→ Turn the adjustment shaft to the right (clockwise)
Downward error (lower limit graduation side) occurs on the level gauge main
unit indicator (the side of the lower limit).
→ Turn the adjustment shaft to the left (counter clockwise)[2] Adjust based on the external receiver
Check the wire connection from the level gauge main unit to the external receiver,and input the transmission signal. Confirm that it receives normally.
Take off the transmitter on the back side of the level gauge main unit, and adjust
the potentiometer shaft as follows (Use a flathead screwdriver (-) for adjusting).
Upward error (20mA side) occurs on the level gauge main unit indicator (theside of the upper limit).
→ Turn the adjustment shaft to the right (clockwise)
Downward error (4mA side) occurs on the level gauge main unit indicator (theside of the lower limit).
→ Turn the adjustment shaft to the left (counter clockwise)※ The proper angle of adjustment shaft is the position that the level gauge main unit
indicator and the receiver indicator are the same. The transmission value of 4-20mA
synchronizes a measurement stroke (full scale) of the level gauge. If the indicatingneedle on the level gauge shows error at this time, remove the front cover, loosen
the set screws for the indicating needle, and adjust only the indicating needle to theactual measurement value or the transmitting indicator value
After adjusting [1], check [2]. After adjusting [2], check [1]. The adjustment is finished bysynchronizing the indicator.

Figure 14. Potentiometer shaft position (assembled on the back side)
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MEMO

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WAKO KEISOKU Co.,Ltd.
864-1, Kuji, Takatsu-ku, Kawasaki-city, Kanagawa, Japan
TEL +81-44-833-7181
FAX +81-44-850-8586

2015.09a

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