FAQ for Dust Sensors

What is the difference between specified dust and ordinary dust?

Dust that may pose a risk to human health is referred to as specified dust, whereas dust that does not have such harmful effects is classified as general dust.

• Examples of specified dust include asbestos, sulfur oxides, lead dust, and cadmium.
• Examples of general dust include cement dust, lime dust, and iron dust.

Where should the Air Particle Monitor be installed, and how should it be mounted?

Please install the unit at a location where the generation of fine particles is a concern.

The monitor can be placed on a wall, desk, or other flat surface for operation.

For fixed installation, please secure the unit using the M3 mounting screw holes provided on the device.

What is the expected service life of the Air Particle Monitor?

The expected service life is approximately 5 years.

In general, particle monitors may experience a decrease in laser output and a reduction in the sensitivity of the photodetector over time. However, our monitor is equipped with an auto-calibration function, which helps maintain measurement accuracy and allows the unit to be used for a relatively longer period.

As a result, the expected service life is approximately 5 years.

Is maintenance required for the Air Particle Monitor?

Since the unit is equipped with an auto-calibration function, routine maintenance is generally not required.

However, please ensure that dust does not accumulate on the product.

What are the power supply specifications of the Air Particle Monitor?

The unit operates on DC24V power.

It can also be connected to a standard AC outlet by using the optional AC adapter.

Alternatively, when installed inside a control panel or similar enclosure, the unit can be powered by supplying DC24V directly to the terminal block, for example from a switching power supply.

Can the Air Particle Monitor be used in a cleanroom?

The applicable conditions depend on the cleanliness class required for the cleanroom.

We recommend using this product in environments with a cleanliness level of Class 10,000 or higher (ISO Class 7 or above).

Is calibration necessary for the dust monitor? If so, when should the calibration be performed?

Calibration is not required; however, periodic functional inspection is recommended.

To ensure reliable operation, we recommend checking the condition of the instrument approximately once a year.

There are two ways to perform this inspection:

1. Our service engineer can visit your site to carry out the inspection.
2. Alternatively, you may return the instrument to our factory, where we will perform the inspection.

In either case, prior contact with us is required. Please feel free to contact us for further assistance.

How can the dust monitor be installed on a duct?

Drill a hole in the duct and weld the supplied G1 socket onto the duct.

The dust monitor can then be installed by screwing it into the socket.

Be sure to connect the grounding (earth) properly.

If the exhaust gas contains moisture, will it affect the measurement results?

Yes, moisture can affect the measurement.

Our Dust Monitors and Air Dust Monitors use the triboelectric measurement principle, and operation is recommended in environments with humidity below 40% RH.

When humidity is high, sufficient static electricity may not be generated during friction, which can prevent proper detection. In addition, vapor may adhere to the probe and cause condensation, leading to dust accumulation or electrical short circuits at the electrodes and resulting in inaccurate measurements.

Optical dust monitors can also be affected by vapor. Light scattering or contamination of the lens may cause measurement errors, and dust deposition on optical components may lead to signal drift and higher indicated values.

Are there any limitations regarding duct diameter, gas velocity, or pressure when installing the dust monitor?

There is no specific requirement for the duct diameter; however, the maximum length of the detection probe is 1 m.

No maximum gas velocity is specified, but the monitor has been successfully used in applications with gas velocities of up to 30 m/s.

The allowable pressure is 200 kPa or lower.

In addition, the recommended humidity condition is 40% RH or lower.

How should the appropriate probe length for the dust monitor be determined?

The appropriate probe length depends on factors such as the duct diameter and gas velocity. As a general guideline, the probe length should be approximately one-half to one-third of the actual duct diameter.

For example, if the duct diameter is 2 m, the recommended probe length would be approximately 600 mm to 1 m.

However, the maximum probe length is limited to 1 m.

What are the maintenance procedures for the Air Dust Monitor?

If the probe becomes contaminated, turn off the power, remove the sensor unit from the self-aspirating device, and wipe the probe with a damp cloth for easy maintenance.

• The grounding wire of the instrument must remain connected even during maintenance.
• Do not perform the work with bare hands, as this may cause a short circuit and result in equipment failure. Operators must wear insulated gloves when carrying out maintenance.

Does moisture in the flue gas affect the measurement results?

Yes, moisture can affect the measurement.

Our Dust Monitors and Air Dust Monitors use the triboelectric detection principle, and operation is recommended at humidity below 40% RH. At higher humidity, electrostatic charge may not be generated properly, which can reduce detection performance. In addition, vapor may adhere to the probe and cause condensation, leading to dust accumulation or electrode short circuits and resulting in inaccurate measurements.

For reference, optical dust monitors can also be affected by moisture. Vapor or mist may scatter light or contaminate the lens, causing measurement errors or drift.

Can the Air Dust Monitor be used in heavy rain?

The protection rating of the unit is IP65, so it can be used outdoors.

However, if rainwater enters the measuring duct, the measured value may increase. In addition, since the unit has a self-aspirating function, mist or fine water droplets may also be drawn into the unit, which can also cause the measured value to rise.

If necessary, we recommend installing a roof or cover to protect the unit from direct rain.

Can the measurement data from the Air Dust Monitor be viewed on a PC or smartphone?

If the separate-type model with battery operation and wireless communication is used, it supports LAN output, allowing measurement signals and alarms to be monitored on a PC or smartphone.

What is the measurable area of the Air Dust Monitor?

The effective sampling range of the unit is approximately 10 cm from the air inlet. Therefore, the monitor should be installed at locations where dust leakage is a concern.

The direction of the air inlet can be adjusted according to the surrounding conditions.

What is the detectable concentration range of the Dust Switch?

The Dust Switch can detect dust concentrations in the range of 0.1 to 1000 mg/m³.

Can the electrode dimensions of the Dust Switch be modified?

We do not offer customization of the electrode dimensions.

What applications is the Dust Switch used in?

It is installed at the exhaust outlet of small dust collectors and used to detect filter (bag) breakage.

What is the minimum detection sensitivity of the Dust Switch?

The minimum detection sensitivity is 10 mg/m³ (based on talc).