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FAQ

FAQ on Level Switch

Rotary Paddle Type Level Switch
  • Q1
  • Longer shaft for Shaft-adjustable Type of 8BA is optional, but can it be used for the lower limit detection?

8BA Type is exclusive for the upper limit detection.

For the lower limit detection in vertical mounting, please select 8BS or 15BL Type.

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  • Q2
  • Do we have any problem if we mount an adjuster on the body of 8BA Standard Type?

No we don't.

Because as for 8BA Type to be used in vertical mounting, a measure to prevent the shaft from falling off is adopted, and so you can mount it. 8B Type is exclusively used in horizontal mounting, and so do not use it in vertical mounting.

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  • Q3
  • NM-8BS Type is equipped with a sliding flange, but can it be possible to detect the level in the center of silo with the Protective-tube Extension Type?

In horizontal mounting, make the dimensions below flange less than 500mm for detection.

Even if you make it less than 500mm, there are some cases where the portion below flange may be deformed. Make sure that a model of Extended Protection-tube Type over 500mm long be vertically mounted.

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  • Q4
  • While it is used right below the slot, the paddle does not rotate though the motor is still on. Is this due to a breakdown?

The clutch works so frequently that its portion may presumably be broken.

As an inner unit with a specially strengthened clutch is available, please try to replace yours with this.

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  • Q5
  • The shaft keeps being rotated all the time. Doesn’t the paddle fall off just in the event of a nut coming loose?

It is firmly attached by the double-nut method, but please check out regularly.

The paddle’s mounting position is in the shape of M8 hexagon cap nut. The motor rotates clockwise in the same direction as the nut is tightened, and therefore it is hard for the nut to wind down. It is firmly attached by the double-nut method, but please check out regularly.

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Microwave Type Level Switch
  • Q1
  • An installed MWS2 does not receive waves orderly and instead turns on the red lamp(block). What is the cause?

Are the cable conduits of both transmitter and receiver installed in one direction?

If they are not in the same direction, microwaves can not be received.

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  • Q2
  • Is any Short-length Type available?

Yes, it is.

A product with an outer diameter of φ60 and a length of 17.5mm is available as well.

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Horizontal Type Float Switch
  • Q1
  • Please give us some features of KF-200 and KFG-200.

A magnet at an end of a float works magnetically and mutually with another magnet in the housing, completely blocked off by a partition wall, and thereby output signal is sent.

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  • Q2
  • Please let us know the withstanding pressure of KF-200 series.

KF-205 model, having higher withstanding pressure, can be used in the pressure up to 1780kPa.

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  • Q3
  • Please provide us with the heatproof temperature of High-temperature Specification Model under KF-200 series.

KF-205TF can be used in the temperature up to 250℃.

KF-205TF model, having higher heatproof temperature, can be used in the temperature up to 250℃.

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  • Q4
  • Is KF200 model usable in a vertically-installed state?

Only KF-207F model out of KF-200 series can vertically be installed.

The size of a float used to secure buoyancy will be φ40 x 200L.

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  • Q5
  • In terms of KF-207 Type now in use, a float touches the inner side of the mounting nozzle. Are there any countermeasures?

May we recommend that the mounting nozzle of KF-207 model should basically be less than 75mm.

When considering the nozzle over 75mm, call our Sales staff beforehand as we can customize the fulcrum pipe to be extended.

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Vertical Type Float Switch
  • Q1
  • We would like to change the detection position of KF-300 model we purchased the other day. Can we do it on the user side?

A. Basically, we do not recommend.

It is a sure thing that you return it to us for our service.

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Multi-point Ball Float Switch
  • Q1
  • Can it be used in a pressure vessel or closed container?

Yes, it can be used in a pressure vessel below 0.2MPa.

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  • Q2
  • Are there any fears that some harmful substances may flow into the tank in the event of a float breakage?

No harmful substance such as mercury or the like is used in a KF-805N float.

It consists of a built-in metal weight and micro switch.

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  • Q3
  • Please give us some precautions in selecting KF-805N Type.

As the weight can become an anchor, please specify the rope’s length so that it may reach the bottom of the vessel.

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Diaphragm Type Level Switch
  • Q1
  • Can it be used in a pressure vessel or closed container?

A. No, it can not.

As a closed container is pressurized during liquid being supplied, the switch operates for detection (ON).

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  • Q2
  • Is there a type adopting a metal diaphragm?

We can customize a switch to be made of a metal diaphragm.

As the shape is changed, however, please contact our Sales staff.

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Electrode Type Level Switch
  • Q1
  • Is it possible to detect the level with your KF-600 model only?

No, it is not.

KF-600 model consists of a detector only. We would like you to purchase an amplifier of 61F series made of OMORON Corp. As 61F series are lined up with a variety of models, we recommend that you use a 61F-GPN per each electrode. e.g.) When you install KF-660N-4, use 3 each of 61F-GPN for 3-point output.

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Capacitance Type Level Switch
  • Q1
  • The tank is empty after a typhoon, but the same switch is always kept on detection. What is the cause for that?

Open the cover and check the inspection seal on the reverse side.

The left seal is printed while the right seal is marked with the water-based ink. When you see the mark to run or fade away, rainwater might possibly get into. As the enclosure rating of Capacitance Type Level Switch is IP-67, a possible idea about its penetration path is around from the cable gland in a connecting portion. If water should seep in, it would be necessary to dismount the switch for cleaning and inspection. So may we ask you to return it to us.

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  • Q2
  • In terms of the remote type of Capacitance Level Switch, we shortened the cable length to adjust the sensitivity, but it did not work any more. Isn’t it the right thing to cut the cable?

A separate cable is a part of the electrode.

Your shortening the cable after the shipment will result in changing the amplifier adjusted values, thus making the switch unable to detect. It is the best for you to return the switch to us so that we may readjust it, but you could do it at your end as well if you would refer to the tentative adjustment method described in the User Manual. (Please note that on some occasions hysteresis becomes big.)

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  • Q3
  • Will an application of vibration to the vessel with a vibrator, knocker or the like be subject to signal chattering?

There may be some cases where the inner elements come down for the vessel’s vibration.

If you return the switch, we will quickly inspect it for repairing. In case vibration exists, a remote-model amplifier can meet large vibration while a plastic-mold amplifier can do small one.

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  • Q4
  • Can’t we apply the same switch to the liquids including but not limited to sulfuric acid, corroding stainless steel?

Yes, you can if the electrode’s wet portion is all protected by Teflon.

Among Pipeline Type Switches which are duct-mountable is also available a similar model whose wet portion is made of Teflon.

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Vibration Type Level Switch
  • Q1
  • When the vibrating rod is contaminated, is the switch always on detection?

This is the level switch good for the detection of the low Apparent Specific Gravity products.

From the detection principle, its vibration reversion capability is lowered when it is set to the high sensitivity. When the vibration reversion operation is not stable, therefore, the Apparent Specific Gravity may be high on some occasions. Once you turn the switch to the standard or low sensitivity, try to do operational checks.

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  • Q2
  • The vibrating rod is deformed. Any countermeasures?

You can reduce the static load to 50kg at the rod tip by putting in the KVA Rod that is Withstand Load model’s vibration rod.

Note: Vibration Type Level Switch is good for the low Specific Gravity products, while other type of level switches may be more suitable for the products that are possibly accompanied by load. Please feel free to contact our Sales staff.

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  • Q3
  • There seem to have been some ingress of water into the housing. Can you trace the entry route?

The enclosure rating of KV series is IP-67.

The cover is tightened with 4 screws. Please note that the cover may be leaned to one side unless you fasten the screws diagonally and evenly.

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  • Q4
  • Is it all right to mount the switch at any angle all though 360 degrees as the vibration rod has the shape of pipe?

There is a mark (↑) on the hexagonal screw of the rod.

Install the switch in such a way that the mark is exactly upward and the cable gland downward.

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  • Q5
  • Is it possible to use the same switch in a vacuum vessel?

Yes, it is.

In our Vibration Type Level Switch series, the portion which contacts powders is processed in welding joint, finished in neither join nor gap thereon. This is why the switch is the best for pressure vessels. From the viewpoint of preventing contamination or preventing mold from growing, it is good for food vessels as well.

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FAQ on Level Indicator

Capacitance Type Level Indicator
  • Q1
  • Is the same meter usable in highly adherent substances?

Yes, It is.

Capacitance Level Meter is the most suitable for highly adherent and insulating substances to be measured. It measures capacitance variation between a main electrode and tank-wall. The increase in the capacitance is so small that no fouling on the electrode may affect the indication.

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  • Q2
  • Please let us know the features of the same meter when compared with non-contact type devices such as ultrasonic type, microwave wave type or the like.

The primary feature is the reliability improved by Analogue Circuit in addition to Contact System.

The electrode directly detects the capacitance value varied by the electrode being submerged in substances. This is why the signal input to the meter is more reliable compared with the non-contact type device.

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  • Q3
  • Is it possible to use the same meter in such a high temperature vessel as ultrasonic or radio wave instruments can not be used?

Yes, it is.

In particular, for insulating substances, the meter can be used in the higher temperature without an insulating sheath. This is good for a Plastic Pellet Manufacturing Plant or the like in which other models can not used due to insufficient heat-resistance to keep their teflon materials well.

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Sounding Bob Type Level Indicator
  • Q1
  • Will you give us the features of KSL series?

KSL series best fit the site where a staff in charge has hung a rope to measure the remaining amount in a silo.

The principle of operation is quite simple; as you push a measuring button, the measuring tape is automatically lowered and will return to the original position after it reaches the level. On this account, there is no concern that any foreign object may mix in from outside. No complicated adjustment is required, either.

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  • Q2
  • Isn’t it too much trouble to conduct maintenance?

It is recommended that for safety reasons the measuring tape be replaced every two years or every measurement of 100 thousand times.

As the operating circuit inside the housing consists of the relay and timer of general purpose products, it is easy for your staff on the site to check and inspect it.

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  • Q3
  • The meter ticks during measurement. What is that sound?

It is the sound that a relay produces once every 10cm of the measuring tape descent.

Counting those times, you can easily find the level. If there are 20 times of ticks, for example, the level will be 2 meter below.

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  • Q4
  • We have many silos whose level we need to measure but we want to do on a low budget. Do you have any good recommendations?

You may use the controller of KSL-DS8 model which can connect 8 detectors.

So the system can monitor the level in a number of silos at the lower cost. (Available is another model of KSL-DS4 which can connect 4 detectors.)

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  • Q5
  • The meter has always kept measuring. Any trouble?

Because materials were fed into while the measuring tape was being lowered, the tape might possibly be buried in the materials.

Leave this as it is. The materials are reduced to have such a burial state restored, thus making the tape return automatically to the wind-up complete position and then to the normal conditions.

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Float Type Level Indicator
  • Q1
  • Will you give us the features of KF-100?

This requires no adjustment, and so the handling is quite easy.

If the float falls down to the lower end, it is 0%, while if it is raised to the upper end, it is100%. It can absolutely float to measure reliably the actual liquid level under the bubbles environment in which an ultrasonic meter has not effectively worked.

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  • Q2
  • An agitator is installed in a tank. Is the meter usable therein?

Yes, it is as long as you install a stillwell.

We can optionally manufacture one.

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  • Q3
  • Can it be applied to strong corrosive?

Yes, it can as long as you select a model whose wet part is made of teflon.

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Radar Type Level Indicator(FMCW)
  • Q1
  • Can it be used to measure objects with low relative permittivity?

Yes, it can.

We have so far had delivery records to the sites of hot asphalt or oils whose εs is equal to 20 or over and those of gravel with least wet

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  • Q2
  • Can a user easily set up or adjust the instrument?

Yes, the user can simply set up and adjust because it adopts a Japanese-dialogue-input system with a large crystal display panel which is optional.

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  • Q3
  • Can the meter be applied to powders?

Yes, it can.

We have delivered many meters to the sites of 20-meter-high powder silos or the like.

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  • Q4
  • The ultrasonic meter now in use is rendered inoperable by bubbles produced on the level. Can this meter be usable regardless of such bubbles?

Yes, it can.

The bubbles are so small in the relative permittivity that micro pulses can pass through. That is why the meter can be used to detect the level which the ultrasonic indicator can not measure. (Note: If those are fine bubbles with the high density in conductivity, it may detect the level of their summits on some occasions.)

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  • Q5
  • A few agitators are installed in the vessel. Can this meter be used therein?

Yes, it can.

Have the meter memorize the reflected electrical waves from obstacles in the vessel at the time of the initial adjustment

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Ultrasonic Type Level Indicator
  • Q1
  • Give us some guidelines for type selection.

As for powders, select REFLEX Type for the long-range measurement up to 20 meters and MULTIFLEX Type for the short-range one up to 7 meters. As for liquids, select MINIFLEX LR Type for the measurement range below 10 meters, Controller built-in Type or MICROFLEX for the measurement one below 8 meters and LU20 for the measurement one below 5 meters.

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  • Q2
  • Is there anything in particular we should pay attention to when installing the ultrasonic type level indicator?

Install the instrument in such a way that the ultrasonic transmitting screen may not be inside of the nozzle but exposed by about 10mm on the internal side of the top board of vessel.

In case the vessel bottom is not flat due to cone-shaped surface or the top board is spherical, the vessel tends to come with scattered reflection, thus causing the meter unable to measure. On such occasions please contact our Sales staff.

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  • Q3
  • Is there anything in particular we should pay attention to when setting up the ultrasonic type level indicator?

Set the dead zone to the longer value.

If the measuring plane gets into the dead zone, the meter becomes inoperable. Please avoid unreasonable feeding to keep the level from going up.

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  • Q4
  • Is there anything we should know about the measuring object for the ultrasonic type level indicator?

On some occasions, the ultrasonic type level meter for liquids may get inoperable as bubbles on the surface and skims in the form of a bead may trigger scattered reflection. Please contact out Sales staff.

The meter can not measure either when an agitating paddle stops right below the transmitting screen.

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Laser Type Level Indicator
  • Q1
  • Give us the features of the same meter.

Through the glass, you can easily make measurement in the place of intricate ductwork or measure hazardous liquids (colored) as long as the level can be seen.

You can make a pinpointing measurement for a sloping surface as well. You can make it possible for the dead zone to be zero by mounting a nozzle. Laser range L model is the long-range over 10 meters while S model is the short-range below 10 meters.

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  • Q2
  • Do laser elements have their life-span?

Yes, they have. It is about 50,000 hours.

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FAQ on Flow Sensor

Microwave Type Flow Sensor
  • Q1
  • Will you give us the smallest diameter out of pipes on which KFD Type can be mounted?

It can be mounted on a 1-inch pipe (25A).

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  • Q2
  • The object to be measured flows off and on, which will be subject to the sensor's chattering. Can we solve this problem by setting up?

Yes, you can with knobs for both On-delay Sensitivity Adjustment and Off-delay Sensitivity Adjustment.

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FAQ on Conveyor Peripherals

Conveyor Peripherals
  • Q1
  • Will you illustrate the brief principle of operation about the Conveyor emergency stop switch?

Your pulling the wire from an arbitrary part has a ratchet mechanism and a spring on the shaft operate the cam, thus operating the contact and keeping it on till you manipulate the reset lever.

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  • Q2
  • What length of conveyor can an emergency switch of KP-850 control?

It can control 50 meters each per left and right, making 100 meters with both.

You may install a pulley at the rope gripping chuck, thus easing the resistance against which you pull the rope.

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Tilt Type Level Switch
  • Q1
  • Are there any precautions to observe in installing a TC-3 Type Tilt Switch?

Tilt Type Level Switch series should be installed in such a way that they touch the lateral side of the repose angle (shevron).

Please note that the switch may be buried if you place it too near the top.

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  • Q2
  • Though we tried to wire, our on-hand tools (hexagon wrench) do not meet the size. Do you use any special screw?

Tilt Switch, TC-3 model, adopts cap screw bolts (3/16) in inch standard.

If you do not have an appropriate hexagon wrench, please order it as well.

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FAQ on Dust Monitor

Electrodynamic Dust Monitor
  • Q1
  • We presently mount on the stack of our plant such a similar dust monitor of electrode type as yours. Unless we clean its electrode, however, the indicated value goes down. How about your electrodynamic dust monitor?

The dust monitor now in use will possibly be an instrument based on the triboelectric principle on which it detects friction charge.

Our dust monitor is not on the triboelectric system but on the electrodynamic system which is the unique measuring principle. That is why no fouling is expected.

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  • Q2
  • Is the adjustment difficult just because it is a precision instrument?

No, it is not. Because it adopts a Japanese-interactive-input system with a large crystal display panel, you can easily adjust it in selecting an item in the interactive mode and entering a numerical value.

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  • Q3
  • A VIEW 370 model is installed at the exit of bag filter, and a minute dust signal is regularly sent. Is this caused by noise?

No, it is not caused by noise.

The bagfilter automatically undergoes the regular pulse cleaning (inversion cleaning pulse) to prevent the filter from clogging. On this occasion, the dust leaking in a moment is detected. As the leaking is only for a moment, the dust is kept within environmental standards when the leaked dust is averaged. In the initial conditions of the filter breakage, minute leaking tends to increase. Getting a clear picture of the peak amount of dust under the normal time will effectively help maintain the filter

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  • Q4
  • We input manually-analyzed values and calibrated the instrument, but they are a little bit different from the manually analyzed values we came up with after the calibration. What is the cause?

This is within the normal operation.

The way of manual analysis is that you insert a suction pipe into the stack to have the instrument measure the weight of the dust through a uniform suction. The measuring spot is the inlet at the pipe tip, which, in other words, is one-point measurement. In the dust monitor series, you insert an electrode into the center of the stack and have it measure the radius portion in a linear fashion. As opposed to one-point measurement, therefore, it will linearly measure, which makes it possible to detect the dust much more in detail than the manual analytical procedures. Linearly measured values, therefore, may be different when compared with the manual analytical values. Please calibrate the instrument with the averaged value out of the values you came up with after you went through the manual analytical procedures several times.

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  • Q5
  • Is there anything we should know about the mounting position of the sensor?

Such a place as dust is evenly distributed and its flow is linear is the best for the sensor to be installed.

The place, being free from fractured parts or obstacles, must have a linear portion more than 3 times as large as the duct diameter, at both the upper stream and downstream of the sensor.

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  • Q6
  • Can it be applied to conductive substances?

Yes, it can be if you mount our special probe.

We have so far had many delivery records to the sites where dust contained in gases with low temperature/much wet or carbon powders are measured and shredder dust at normal temperature is suctioned.

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  • Q7
  • Can you adjust the sensitivity for us prior to your factory shipment?

It is necessary to calibrate with values obtained from our manual analytical procedures after the instrument installation in order that the dust monitor may detect the dust quantity correctly.

The detection signals vary by the electrode length, the duct shape/diameter or dust physicality. That is why we can not adjust the sensitivity prior to the shipment.

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FAQ on Special Measurement Instrument

Ultrasonic Area-Velocity Flow Meter
  • Q1
  • Are there any safety precautions to observe when actually testing AVFM5.0?

①For your reliable measurement, make sure to secure a linear portion more than 10 times as wide as the channel width at the upper stream of the sensor.
②The sensor’s dead band is 25.4 mm. As the water level falls below the dead zone, the meter can not measure.
③Please note that the meter can not be used near a weir because the flow velocity is lowered there and the liquid level rises.

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  • Q2
  • As the discharging amount decreases and the level gets into the dead zone, the indicator shows 0m³ from time to time. Is it possible to reduce the dead zone by laying the sensor at the bottom of the channel where a small amount of water is still flowing.

As the sensor transmits Doppler waves from its front face and receives the same ones there, it is impossible to submerge the sensor.

Narrow the channel width at the upper stream to raise the liquid level.

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  • Q3
  • Is there any portable type of AVFM5.0?

Yes there is. A portable type, Stingray, is available.

Operated with 4 pieces of alkaline battery, it builds in a data logger of 130,000 memories.

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Ultrasonic Liquid Flow Meter
  • Q1
  • Are there any safety precautions concerning the installation site before actually testing PF-330?

The linear portion of pipe is critical.

Secure a linear portion 20 times as wide as the diameter at the upper stream and 10 times at the downstream. Please note that the meter will not be able to measure due to bubbles and/or disturbed flow that are formed when it is located near a valve or an elbow.

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  • Q2
  • We are planning to test DFM-5.1 model, using tap water with neither stain nor bubble. Can it be all right?

Yes, it can.

Water flowing in the pipe will produce fine air bubbles. The meter can measure even in clear water by the Doppler principle.

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  • Q3
  • Is there any switch model adopting the Doppler system?

Yes, there is. A flow switch of DFS-5.1 model is available.

This can be applied to discharged water, slurry, abrasive liquid and such chemical liquids containing bubbles or solids as we find it difficult to measure.

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Ultrasonic Sludge Blanket Level Indicator
  • Q1
  • Are there any safety precautions to observe when actually testing ENV-100P(Portable Type)?

Yes, there are. For reliable measurement, set the dead zone to 0.6m or over.

This is effective for noise produced by substances floating near the water surface. The meter can not be applied to substances continuously foaming under water.

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  • Q2
  • Now that we use ENV-100S model (stationary type), can you describe how to secure it?

An external thread of NPT3/4 is on the cable conduit of the sensor. Please arrange an internal thread coupling (NPT3/4) and a pipe, and secure the linked pipe to the handrail or the like in the vicinity with a U-shape bolt, etc.

The pipe can optionally be available at the requested length by your separate order. The accompanying standard cable is 10m long.

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  • Q3
  • How deeply into the liquid is the meter installed?

You may submerge it by about 30cm into water to keep away from suspended solids.

As the water depth comes to be shallow and the sensor’s transmitting screen gets away from the liquid, the meter will not be able to measure. It is possible for you to install the sensor up to 1m deep into water.

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  • Q4
  • Every few hours airspace is formed by bubbles attached to the transmitting screen, thus making the meter unable to measure. Are there any countermeasures?

Use a cleaning unit you can optionally order.

A signal from a controller building-in a compact compressor artificially spews out bubbles toward the transmitting screen, there by wiping out the fine bubbles attached thereto.

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Contact

Osaka Office 81-6-6312-2071

東京支店 03-5777-6931

名古屋営業所 052-741-2432

九州営業所 (本社)093-511-4741

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