Dutch Trading Company (Brighton) was set-up in 2006 to sell Bobike child seats to the UK direct from Holland. To expand activities, we are selling the Korean Senselife Tim8 CO₂ Monitor in the UK, with delivery in 3 business days. The Tim8 is it is a consumer level CO₂ monitor at a relatively low price.

We believe people work and rest better with fresh air. The drive to make buildings energy efficient has, we believe, lead to ~90% having poorer indoor ventilation rates, and air staler than in the past.

We are marketing low cost CO₂ meters to people running or occupying buildings with double glazing and no air conditioning. Especially for:

• Dwellings
• Schools
• Medical

The Senselife Tim8's CO₂ alarm sounds when CO₂ levels exceed 1,500ppm, which is a cue to open windows (the alarm can be set to other levels such as 1,000ppm for school classrooms).

We draw attention to the following quotes from this press release (www.reading.ac.uk/about/newsandevents/releases/PR18842.asp) :

• "The pupils and teachers in the classrooms studied were exposed to unacceptably poor air quality conditions, with CO₂ concentrations of up to 3.5 times the existing recommended average levels of 1500 ppm (Building Bulletin 101) "
• "Professor Clements-Croome said : "Fresh air supply rates of 8 l/s per pupil are needed if the concentration of pupils is not to be impaired. Teachers need not only temperature monitors but also CO₂ monitors to help them assess when to open windows or turn on the ventilation."

and the underlying study (http://gow.epsrc.ac.uk/ViewGrant.aspx?GrantRef=GR/T23626/01) which makes the following recommendations to the school personnel:

• Equip classrooms with monitoring devices for: CO2, temperature & relative humidity.
• Increase ventilation if CO₂ concentration exceeds 1000 ppm.
• Keep temperatures between 20-22 C (winter) and 22-24 C (summer).
• Avoid moisture build up in classrooms and keep humidity levels below 60% during winter-time.
• Create daily windows opening routines for the school: Morning, before children arrive, During breaks and after school hours during cleaning

To promote the Senselife Tim8, we will lend one to schools Hove, Brighton, Sussex and Surrey - interested school staff, govenors or PTA members please email (DTC@conwasa.demon.co.uk) or phone (07973 752070). A Radon gas meter is also available for loan.

Monday 22nd November 2010: The Tim8 is back in stock, in one colour, Plain White.


The Senselife Tim8 has the following specifications:

• CO₂ measurement: 0-9,999 ppm ±50ppm ±5% sensing value - Non-dispersive infrared (NDIR) sensor with automatic background calibration
• Humidity measurement: 30-80% RH ±5%
• Temperature measurement: -20 to 50°C ±1°C
• Alarms: High CO₂ (adjustable, default is 1,500ppm during the day (6am to 10pm) and 5,000ppm at night)
• Optional Alarms: low humidity, high humidity, dew point (all supressed at night) and morning call

Note: We will advise overseas customers of the level of postal service afforded by the £15 postage paid at checkout, before dispatching the order. All overseas orders will be sent by air, but we may not be able to offer 'signed for' or insurance to some destinations.

Type A and Type C socket adaptor set. Allows the mains adaptor supplied, which can accept input voltages from 110v to 240v, to be used in Type A and Type C sockets. Based on Maplin product BN30H.

Type A and C sockets are found in the following countries:
Albania, Algeria, Angola, Anguilla, Antigua, Argentina, Aruba, Austria, Azores, Bahamas, Bangladesh, Barbados, Belgium, Bermuda, Bolivia, Bosnia, Brazil, Bulgaria, Burkina Faso, Burundi, Cambodia, Cameroon, Canada, Canary Islands, Cape Verde, Cayman Islands, Central African Republic, Chile, China, Colombia, Comoros, Congo, Costa Rica, Cote d'Ivoire (Ivory Coast), Croatia, Cuba, Cyrpus, Dem. Rep. of Congo (Zaire), Denmark, Djibouti, Ecuador, Egypt, El Salvador, Equatorial Guinea, Eritrea, Faeroe Islands, Finland, French Guiana, Gabon, Germany, Gibraltar, Greece, Greenland, Guadeloupe, Guam, Guatemala, Guinea-Bissau, Guinea, Guyana, Haiti, Honduras, Hungary, Iceland, India, Indonesia, Iran, Iraq, Israel, Italy, Jamaica, Japan, Kazakhstan, Korea, Kuwait, Laos, Lebanon, Liberia, Lithuania, Luxembourg, Macedonia, Madagascar, Madeira, Maldives, Mali, Martinique, Mauritania, Mauritius, Mexico, Micronesia, Monaco, Montenegro, Montserrat, Morocco, Mozambique, Myanmar, Nepal, Netherlands, Nicaragua, Niger, Niger, Norway, Okinawa, Oman, Pakistan, Panama, Paraguay, Peru, Philippines, Philippines, Poland, Portugal, Puerto Rico, Romania, Russia, Rwanda, Samoa, Saudi Arabia, Senegal, Serbia, Slovenia, Somalia, Spain, St. Vincent, Sudan, Suriname, Sweden, Switzerland, Syria, Tahiti, Taiwan, Thailand, Togo, Tunisia, Turkey, United States, Uruguay, Venezuela, Vietnam, Virgin Islands, Yemen, Zambia.

   £6.00 (plus  £6.50 P&P if ordered seperately)

6 volt battery pack including charger, giving 8 hours of portable operation. Based on Maplin products UD05F and LJ92A.

   £25.00 (plus  £6.50 P&P if ordered seperately)

Further reading:

World Health Oranization, European Region - The Right to Healthy Indoor Air
www.euro.who.int/document/e69828.pdf

• "Indoor air quality is an important determinant of health and wellbeing. However, the control of indoor air quality is often inadequate, one reason being the poor articulation, appreciation and understanding of basic principles underlying policies and action related to indoor air quality. As a result, the general public is familiar neither with those principles nor with their associated rights."
• "Awareness of the health significance of good indoor air quality is low in many societies, mainly because sufficient information is not available to those affected. In modern societies, exposure to indoor air results in more contact with many environmental contaminants than exposure to food, water and outdoor air. However, the laws protecting people from harmful exposures indoors are less developed than regulations concerning ambient air, drinking-water or food quality. This potentially increases inequalities in health and aggravates health risks in the less informed, poorer parts of the society and among the most vulnerable groups, especially children."
• "By the year 2015, people in the Region should have greater opportunities to live in healthy physical and social environments at home, at school, at the workplace and in the local community."

• "2.2 To what extent do existing schools meet these standards? Many schools do not meet the standards. Not even the lowest ‘class C / category III levels’. The estimate is that at least half of all schools worldwide (in some countries over 80%) can be labelled as having ‘very bad’ indoor climate. "
• "In most countries school building designers do NOT work with a good technical program of constraints describing IEQ performance criteria that should be met. Especially for smaller schools and primary schools in general this is a problem."
• "It is concluded that the available scientific literature indicates the potential for 5% to 10% increases in aspects of student performance with increased classroom ventilation rates or better temperature control"

• "The study found that approximately 50% of the ventilation rates measured by PFT were below the recommended minimum rate of 3 l/s per person. In most cases schools were capable of the enhanced 8 l/s per person. Daily mean concentrations of CO₂ exceeded 2,100 ppm in 10% of cases suggesting that ventilation was not adequate. Approximately 60% of CO₂ values were between 1,000 and 2,100 ppm implying ventilation rates of were at least 3 l/s per person at these times.
• "Inadequate use of openable windows was the main reason for poor ventilation in classrooms."

Press Release: Air quality in schools affects cognitive performance
www.reading.ac.uk/about/newsandevents/releases/PR18842.asp

• "The pupils and teachers in the classrooms studied were exposed to unacceptably poor air quality conditions, with CO₂ concentrations of up to 3.5 times the existing recommended average levels of 1500 ppm (Building Bulletin 101) "
• "Professor Clements-Croome said : "Fresh air supply rates of 8 l/s per pupil are needed if the concentration of pupils is not to be impaired. Teachers need not only temperature monitors but also CO2 monitors to help them assess when to open windows or turn on the ventilation."

Education (School Premises) Regulations 1999:
http://www.statutelaw.gov.uk/content.aspx

• " Part IV, Section 21. — (1) All occupied areas in a school building shall have controllable ventilation at a minimum rate of 3 litres of fresh air per second for each of the maximum number of persons the area will accommodate. "
• " Part IV, Section 21. — (2) All teaching accommodation, medical examination or treatment rooms, sick rooms, isolation rooms, sleeping and living accommodation shall also be capable of being ventilated at a minimum rate of 8 litres of fresh air per second for each of the usual number of people in those areas when such areas are occupied. "

Building Bulletin 101, Ventilation of School Buildings, Regulations, Standards, Design Guidance, Version 1.4 – 5th July 2006
www.teachernet.gov.uk/_doc/9953/Building%20Bulletin%20101%20-%20Version%201.4.doc

• " The ClassVent calculator provides a means of sizing ventilation openings for natural ventilation design. The ClassVent ventilation design spreadsheet was prepared specifically to assist the scheme design stage. This is provided to make it easier for designers to meet Building Regulations requirements in common situations. The tool contains detailed user guidance "

• " This CPD will provide the background to the part that CO₂ plays in comfort assessment and the need to maintain carbon dioxide in educational establishments below recommended limiting levels while optimising fresh air supply rates to reduce energy consumption. "
• "Ct = ((CO + 106 × P/Q) × (1-e^-nt)) + Ci × e^-nt where C is the concentration of CO₂ (ppm) with suffixes t = after time t, i = initial (at time = 0), O = outdoor air. "

CO₂ Primer
What is CO2 DCV rev1.pdf
        written by SenseAir, the Swedish developer of the sensors used in Senselife products.