Gas Sensing Technology
Core technology of NIDS gas sensing
- Designed to minimize instant power consumption
increases battery efficiency through low power consumption
- Excellent researchers, sensor development labs
Optimized design including high precision
high accuracy, miniaturization, and light weight
- Securing sensor calibration technology
correction and calibration technology for external environment
manual calibration technology and operation processing related technology
- High safety and reliability
maintaining long-term reliability with stable, low-noise circuit configuration technology
Minimizes performance deterioration of sensors
cutting-edge equipment for sensor reliability calibration
- Low concentration gas detection technology
Optimized for measuring gas
maximizing light-efficiency condensing
- Retains control design mode technology
for low power consumption design
Evaluation board control software
Measurement principle of Gas SensorOptical NDIR gas sensor
The operating principle of the IR Dust Sensor is the optical scattering method
Air enters through the intake valve of the sensor. Infrared LED light switches repeatedly to sense dust particles in the air. ((Ex. CO2 absorbs a specific wavelength, 4.26㎛, while CO absorbs 4.26㎛.)
Use of NDIR / MOS / MEMS technology
Excellent, long-term stability
|Measurement of electromotive
force by redox reaction
|Measurement of change in
|Use of natural absorption wavelength of gas molecules
|Small, low cost
· Excellent gas selectivity and reproducibility
· Longevity (10 or more years)
|Short line, low measurement reliability
|High price (Increase in demand with recent price decrease)
|Relatively low measurement accuracy due to interference
from moisture and other types of gas
|Measurement without interference from other gases,
other than measurement target gas, high accuracy
Metal Oxide Semiconductor (MOS) Sensor
Also known as MOS sensor, it is a technology that detects gas by changing density of surface conduction electrons
by chemical interaction that occurs when semiconductors encounter gas.
The sensor typically reacts through four steps
- Adsorption of oxygen on
the semiconductor surface
- Reaction of adsorbed
gas and oxygen
MEMS is short for Micro Electromechanical System, which is a device in which sensors, actuators,
and electronic circuits are integrated in a microstructure produced using semiconductor technology.
Features of MEMS sensor
Provides high sensitivity, low power consumption, fast response,
small size, and long-term stability.
High reliability and excellent long-term stability with gas detection
technology and dedicated digital module acquisition technology.
Low power consumption, high sensitivity, rapid response,
high reliability and stability, low cost and a simple driving circuit.
Detects information outside the car in addition to the latest devices,
e.g., smartphones, PC, and game devices.
Modern people spend 80-90% of their time in sealed indoor spaces.
Numerous micro pollutants in the air cause eye irritation, headache and fatigue, and have a direct impact on people's health.
NIDS believes that measuring indoor air quality and controlling within an appropriate range is the key to well-being and health,
and helps customers achieve maximum function when used in their products.
Ventilation and purification are the best options
for maintaining clean air.
Indoor air quality measurement data obtained from our sensors become our customers’ core asset
for configuring air purification systems or managing ventilation systems.
Outdoor air pollution enters indoor spaces through open window or ventilation systems. The indoor environment exposed to outdoor pollutants, such as soot, automobile exhaust gas, and pollen must be managed to ensure clean air quality. Therefore, the importance of particle sensing is ever-increasing. Comprehensive indoor air quality management for indoor environmental aggravating factors, such as paints, fabrics, cleaning products, food odors and dust mites, is a technology that should be actively considered at home.
In smart buildings, a system to monitor indoor air quality can be quickly and
easily installed and operated. Information providing remote control, wireless communication and APIs is used by the entire system to manage heating, ventilation and air conditioning (HVAC).
At the Workplace
Cluster infections during the COVID-19 pandemic provided real examples of how we need to manage and improve workplace air quality for the health of our employees. In general, improvement of indoor air quality can be expected by increasing the ventilation rate of offices, but employees can easily be exposed to harmful substances from printers or outdoor air pollutants, which are insufficient to apply to indoor structure, air quality, and in-house regulations. In addition to humidity and temperature, air pollutants, such as CO2, volatile organic compounds, and fine particles can affect work performance and well-being. Improvement of the office work environment through indoor air quality management technology leads to better decision-making among employees and lower rates of absenteeism, thereby boosting productivity.
Dangers in indoor air
Air pollutants, such as dust, mold, bacteria, and chemicals accumulate in enclosed spaces.
This is closely related to our lives as it negatively affects air quality in our homes and offices, causing health risks.
- Carbon dioxide
Carbon dioxide correlates with human activity
in enclosed spaces. High concentrations of carbon
dioxide can cause headaches, drowsiness, lethargy,
and performance degradation. Therefore, compliance
standards through sensors are recommended.
- Nitrogen dioxide
Nitrogen dioxide is produced by combustion of fossil
fuels and is present in emissions from factories and
automobiles. It acts as a precursor to ozone by reacting
with VOCs. Excessive exposure to nitrogen dioxide can
negatively affect the body, especially lung function.
Formaldehyde is widely used in production of industrial
products, such as adhesives in wood-based materials,
flooring or paints. It is also considered to be the main
cause of sick house syndrome. Exposure to high
concentrations above 50 ppm may cause eye irritation
and can lead to cancer.
- Volatile organic compounds
Volatile organic compounds are substances
containing carbon in the atmosphere. Short-term
exposure may cause irritation and dizziness, and
can exacerbate the symptoms of asthma. Long-term
exposure may cause lung cancer and damage to
the liver, kidneys and nervous system.
- Fine dust
Fine dust is generated not only from natural sources,
but also from various types of stationary or mobile
sources. It aggravates respiratory diseases, such as
asthma and triggers allergic reactions. Therefore, use of
a precision measuring system is required in accordance
with active management guidelines both
indoors and outdoors.
- Temperature and humidity
Control of temperature and humidity is an important
factor in achieving optimal environments for human life.
The human body feels most comfortable in the
humidity range of 40-60%, whereas dry air irritates
the respiratory tract and moist air creates
condensation, which can lead to mold.