Indoor Air Quality (IAQ) refers to the air quality within and around buildings and structures, especially as it relates to the health and comfort of building occupants. Understanding and controlling common pollutants indoors can help reduce your risk of indoor health concerns.

The TENMARS ST-502 Desktop Indoor Air Quality (CO2) Monitor is a desktop indoor air quality monitor that can measure carbon dioxide, relative humidity, air temperature, and ventilation rate.

Application

TENMARS ST-502 Specifications

Temperature

Relative Humidity

CO2

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The Tenmars ST-501 with it’s non-dispersive infrared (NDIR) sensor measuring CO2, CO2 ventilation rate, temperature & humidity while ensuring long-term stability and durability, the Tenmars ST-501 CO2 / Temperature / RH Monitor is ideal for building HVAC monitoring, indoor air quality surveying or locating combustible fumes.

Providing a large easy-to-read display, internal CO2 alarm buzzer and inbuilt parameters capable of adjusting CO2 reading for altitude changes, the Tenmars ST-501 is suitable for use in most environments.

The Tenmars ST-501 also offers data logging of up to 50,000 records and fast USB download (under 10 seconds), with easy-to-use PC software perfect for data analysis.

Tenmars ST-501 Applications:

• Building HVAC monitoring

• Indoor air quality survey

• Locate the presence of combustion fumes from vehicles and appliances

Tenmars ST-501 Specifications:

CO2: 0 to 9999 PPM (2001 to 999ppm over range), accuracy of ±75 PPM or 8% of reading (0 to 2000ppm)

Humidity: 0 to 100 RH, accuracy of 2.5% at 10% to 90% RH

Temperature: 0°C to 70°C, accuracy of ±1°C at 25°C

Signal Update: every 2 seconds

Warm Up Time: < 2 minutes

Operating Conditions: °C to 50°C (32°F to 122°F), 0 to 90% RH non-condensing

Power Supply: 4 x type ‘AA’ Alkaline batteries

Battery Life: approx 24 hours

External Power Supply: 6V DC 0.5A

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Formaldehyde is an organic chemical that is very prevalent in our environment. It has colourless gas with a pungent odour from a family of gases called aldehydes. Commonly known as a preservative in medical laboratories and mortuaries, formaldehyde is also found in other products such as chemicals, particle board, household products, glues, permanent press fabrics, paper product coatings, fibreboard and plywood. It is also widely used as an industrial fungicide, germicide, and disinfectant.
It is a sensitising agent that can cause an immune system response upon initial exposure. Airborne concentrations of formaldehyde above 0.1ppm can cause irritation of the respiratory tract. Most people don’t have any health problems from small amounts of formaldehyde in their homes or office. As levels increase, some people have breathing problems or irritation of the eyes, nose, throat, or skin from formaldehyde exposure.

These health effects can happen in anyone, but children, older adults, and people with asthma and other breathing problems are more likely to have these symptoms. If you or someone has these symptoms then you should use the Tenmars TM-802 Formaldehyde Meter to test for formaldehyde levels

Tenmars TM-802 Formaldehyde Meter Specifications:

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Tenmars TM-186 Maintenance

a Do not use the meter in an environment with severe change; do not store the unit in an environment with high temperature, high humidity, and high vibration. Take the battery off if the meter has not been used for a long period of time. The Diode temperature probe is used to measure temperature and the capacitive humidity sensor is used to measure take humidity. The thermocouple and humidity sensor will start aging under the influence of oxidation, reduction, corrosion, pollution, vaporization, diffusion or other metallurgy. The aging process will affect its precision seriously. Cleaning and inspection of temperature probe: The smoke, coal, dust, grease attached on the protective tube oftemperature probe will slow down the heat conduction of the thermocouple and cause measuring error. Therefore, it should be cleaned periodically. The metal coating of thin thermocouple should be replaced properly upon the occurrence of corrosion. o Cleaning and inspection of humidity sensor: The smoke and dust attached on the humidity sensor will slow down the function of humidity sensor and cause measuring error. Therefore, it should be cleaned periodically. Blow off the dust with mild compressed air instead of water or alcohol. The aluminum plate inside the humidity sensor should be replaced upon the occurrence of corrosion

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