Most gas sensors are affected by the external environment and are likely to change.

Sometimes you’re required to calibrate the sensor by yourself during ventilation or near the window.

Self-calibration cycle,

1. When VOC does not drop below 0.050ppm during ventilation and/or,

2. When CO2 is not lowered below 450ppm during ventilation and/or,

3. When the VOC or CO2 measurement is suspected to be abnormal.

1. Charge for more than 1 hour while the product is off.
2. Place the product indoors or in a clean environment for more than 5 minutes.
3. Press and hold the “Power button” until the Huma-i logo is displayed.
4. "CALIBRATION" is displayed on the screen, and calibration is performed automatically for 3~4 minutes.*** If "CALIBRATION" is not displayed on the screen, turn off the product and return to step 3.
5. When calibration is finished, the product automatically turns off and on.

If the value is "0" during measurement, a purifier is operating properly.

If "0" is continuously displayed, the small particles in the sensor area are occasionally stuck to the sensor side due to electrostatic phenomena, which prevents normal measurement. In this case, blow off the suction side of the device strongly 2 or 3 times and it will work normally. This is located on the left side of the product front. If this is not the case and you keep seeing "0", please contact the customer service center nearby.

It is designed to automatically power off when there is no operation for 10 minutes to protect battery life.

If you want to use it continuously, then press the power button lightly to extend the use for another 10 minutes.

The automatic power-off function does not work when the power cable is connected.

Huma-i shows the air quality level in real-time as the internal fan is actively and constantly sucking in the air just around you.

The fan makes a slight vibration tone.

If you rub a tissue lightly on the fan inlet, you can see that the value changes in real-time.

If you want to learn more about Huma-i measuring algorithm, click the link below.

https://youtu.be/OMouDdOFXtM

We recommend using the following:

1. When you receive the product for the first time, please charge it for more than one hour.

2. We recommend that you connect it to the charger before going to bed.

(It is better to charge the battery frequently as well)

OLED display shows CO2 measurement value in CO2 mode.

To view all measurement results simultaneously, use the integrated display mode.

Or switch to PM (Particulate Matter) measurement mode to see PM2.5 & PM10 concentration.

Measurements are being made, but OLED display in ICON or PM mode shows PM2.5 & PM10 value.

To view all measurement results at the same time, switch to the integrated display mode.

Or switch to CO2 mode to see CO2 result.

The measurement starts normally after 15 seconds when the VOC and CO2 measurement is first activated.

Sometimes it is measured in less than 15 seconds.

In case of use for more than 10 minutes, the response time of the sensor is improved and the measurement wait time is shortened.

If the power has not been completely disconnected (even while charging) for more than 10 minutes, the measurement wait time will be shortened.

It is a function to inform the user of the ventilation time recommendation for health reasons if the CO2 level is higher than 2000ppm, which may cause drowsiness.

It is divided into 4 categories.

GOOD: 400-700 ppm

MODERATE: 701-1000 ppm

POOR: 1001-2000 ppm

UNHEALTHY: 2001-10000 ppm

The recommended guideline for the indoor standard is kept below 1000ppm (8 hour average), which is used by many countries around the world as recommended by ASHRAE (American Refrigeration and Air Conditioning Association).

Thus, you can deem it to be appropriate if the category is Good or Moderate.

Carbon dioxide is a colorless, tasteless gas that is heavier than air. The gas itself is not very toxic, but when it is present in large quantities it increases the respiration rate of a person. This gas may be harmful because it increases the risk of inhaling mixed harmful gas.

The effect of CO2 gas on our body:

- 450ppm or less: It is comfortable in normal outdoor air condition and has no effect on the human body.

- 451 ~ 700ppm: Indoor level without health problems even for a long time.

- 701 ~ 1000ppm: There is no health damage, but some people may feel discomfort.

- 1001 ~ 2000ppm: At this level the physical condition changes and people may feel drowsy or sleepy. 

- 2001 ~ 3000ppm: A this level the health damage begins...

Since the sensor is mounted inside the product, the measurement time may be delayed.

Depending on the external temperature, the measurement time may be different.

The measurement deviation is 5% ~ 10%.

The integrated display mode displays PM2.5/PM10/VOC or PM2.5/VOC/CO2 at once in graph form. 

If the measured value is “POOR” or greater than or equal to that level, the letters of each item will blink and warn you.

If the alert function is working, and the air quality is at POOR or UNHEALTHY level, we strongly recommend you to ventilate or wear a mask.

Huma-i black model displays PM2.5/PM10/VOC and PM(PM2.5 and PM10 AUTO)/VOC/CO2 with two kinds of integrated display mode.

This mode is displayed in graph form on one screen with 4 categories – GOOD, MODERATE, POOR, UNHEALTHY.

Each category has 18 steps. (72 steps in total)

Even if you do not see the numerical value directly, you can see it in 72 steps, which is very intuitive.

If you do not ventilate by closing the door overnight, VOC may be released overnight in a new house or new furniture containing hazardous substances, which may increase the VOC level of the house.

Many products used daily can release harmful substances, and the higher the number of such substances, the higher the VOC level can be. Volatile Organic Compounds such as formaldehyde are gradually reduced by frequent daily ventilation.

We recommend that you ventilate in the morning, and ventilate more often if the VOC level is high.

Most purifiers filter out more than 99% of fine dust, but CO2 and VOC cannot be filtered like fine dust. In order to remove CO2 or VOC, which is a volatile harmful substance such as formaldehyde, it is most effective to remove the cause or to constantly ventilate daily.

The health effects or symptoms of VOC are;

- Irritation to eyes, nose and throat.

- Causes headaches, loss of coordination and nausea.

- Causes allergic skin reactions.

- Causes shortness of breath, nausea and vomiting.

- Causes fatigue and dizziness.

- Causes liver, kidney and central nervous system damage.

- Some organisms can cause cancer in humans and animals.

Especially methylene chloride (contained in adhesive removers and aerosol spray paint) is known to cause cancer in animals.

Benzene is a substance that causes cancer in humans.

Indoor sources include cigarette smoke, stored fuel, paint supplies, and automobile exhaust.

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Huma-i air quality monitor follows the recommendations of the German Health Ministry, which is divided in 4 levels:

GOOD: 0.000 ~ 0.220ppm

MODERATE: 0.221 ~ 0.660ppm

POOR: 0.661 ~ 2.200ppm

UNHEALTHY: 2.201 ~ 10.000ppm

VOC occurs mainly in household products such as:

- Paints and other solvents

- Wood preservatives

- Aerosol sprays

- Detergents and disinfectants

- Insecticides, fragrances and pesticides

- Combustion fuels such as volatiles

- Dry cleaning clothing

- Products with glue

OLED display shows the VOC measurement value in the VOC mode.

To view all measurement results simultaneously, use the integrated display mode.

Or switch to PM (Particulate Matter) measurement mode to see PM2.5 & PM10 concentration.

Measurements are being made, but the OLED display in the ICON or PM mode shows PM2.5 & PM10 value.

To view all measurement results at the same time, switch to the integrated display mode.

Or switch to VOC mode to see VOC result.

Due to the nature of the gas sensor, VOC or CO2 values can be measured slightly higher or lower when power is on, which is normal.

The longer the disconnection period is, the longer it may take to stabilize.

If you do not use it, you can keep it charged for more stable use.

VOC and CO2 sensors require time to stabilize.

It takes around 15 ~ 60 seconds, and it usually shows the measured value in around 15 seconds.

If there is a purifier, put it on the purifier outlet.

If the measured value is less than 10 units, it will work normally.

Another method is to rub a tissue on the suction side of the device to generate dust, which can lead to an increase in the PM10 value.

If you smoke, the level will go up tremendously.

However, smoking is harmful to your body, so please do not try it in this way.

Basically, fine particles of water coming from a humidifier are perceived by optical sensors as fine dust, which is also seen in high-end equipment. We recommend that you turn off the humidifier and measure. Even on rainy or very humid days, PM measurement is a little higher on the same principle.

For accurate measurement and prolonged use, you can keep the sensor clean by strongly blowing the air intake part 2 ~ 3 times. When storing the device for a long time, please keep it away from dust and humidity. 

The PM sensor has a life span of 10,000 hours and can be safely used for more than 2 years on a regular basis. The life span of VOC or CO2 gas sensors is 10 years.

Yes, you can use the mobile phone fast charger due to the built-in high-speed charger protection circuit.

The PM levels provided by the Meteorological Administration and Smartphone application are basically measured at more than 10m above the ground and are provided by a specific measuring station installed in a specific area. Our device measures the air quality just around you in real-time.

Huma-i provides a display mode that meets the World Health Organization (WHO) recommendation criteria.

Especially infants and elderly people with weak immunity are strongly recommended to use the WHO mode.

The PM levels provided by the Meteorological Administration and Smartphone application are basically measured at more than 10m above the ground and are provided by a specific measuring station installed in a specific area. Our device measures the air quality just around you in real-time.

Huma-i basically uses a rechargeable lithium-polymer battery.

Assuming that you use it for 10 minutes each time, it can be used about 10 times when fully charged.

(It may vary depending on the battery condition.)

If you use a portable auxiliary battery, you can use it much longer.

Huma-i basically uses a rechargeable lithium-polymer battery.

Assuming that you use it for 10 minutes each time, it can be used about 10 times when fully charged.

(It may vary depending on the battery condition.)

If you use a portable auxiliary battery, you can use it much longer.