Our customers write us...
Do you have a comment or a testimonial you'd like to share? Send it to us using the contact form and if we print it we'll send you a CO2Meter for free!
"We Don't Usually Include CO2 Testing...I'm Glad We Did"
I recently did a routine IAQ "home health check" for a client in Shanghai...the radon came back above the EPA action level. Strangely, the CO2 measurements were also way above normal.
We don't usually include CO2 testing in residential projects unless clients complain of stuffiness or have ventilation issues. In this case, I'm glad we did. I first assumed that the CO2 monitor had problems or the consultant sampled incorrectly, but then I did some research and found that CO2 is often a carrier gas for radon and that areas with high radon are often accompanied by higher concentrations of CO2.
I will be including CO2 as a standard when testing any radon in a home with a basement.
Louie @ Pure Living China
"Here is How Your CO2 Meter Helped Students in our District."
I teach Life Science to 7th graders, Earth Science to 8th graders, and an entry level Environmental Science elective course at Clyde Boyd Middle School in Sand Springs, OK. I received your CO2 meters as part of a toolkit from a program called Oklahoma Green Schools. We used the meters to monitor levels of Carbon Dioxide inside the classrooms and all over the school. They were the TIM10 style and were very easy to use. My students made a chart to monitor for 5 days, each class beginning and end readings. We asked teachers that wouldn't mind to volunteer their rooms for some real investigations that would help collect data for our project in the ES classes. We had an overwhelming response and collected some very good data.
Within the first 15 minutes classes reach over 1,000ppm with the door closed and an average of 22 students. Classes that leave their door open and an average of 22 students levels reach over 1,000ppm in 25 minutes. At the end of class levels reached 2,500ppm and 2,100ppm respectively. One classroom of 30 students. After lunch, it reached levels of 4,825ppm with the door closed...in the other room that had 18 students and an open door, the levels barely reached 1,200ppm.
The teachers that signed up for this study were really interested in the findings. We noticed a rise in asthma sufferers needing their inhalers later in the day when CO2 levels were the highest, typically after lunch. We also found a direct correlation to nausea, and headache complaints when levels were over 2,000ppm. Yawning started about 2,500ppm and progressed to some students just laying their heads down around 3,500ppm. Students struggle to pay attention with high levels of CO2, and even the dean of students saw more discipline issues later in the day.
The building has been added onto for over 30 years and has been renovated numerous times. Our HVAC systems have CO2 sensors in the hallways but not inside classrooms. They are also on a timer system to conserve energy. Some teachers leave their doors open, others close theirs, while some even open windows. We had a lot of variables and no two classes were alike. With our findings we were able to convince the architect to install the sensors inside the classrooms. This will increase the amount of fresh air that gets inside the classroom when levels get too high.
Next year we will continue to monitor CO2 to ensure the levels stay at suitable ranges and will use the monitors at other schools within our district to ensure the learning continues.
Thanks for your product and the application to keep our kids learning by keeping their levels of CO2 to a minimum.
Kenneth Cole
Science Teacher
Clyde Boyd Middle School
Sand Springs, OK
"Your Resource Page is Great"
I hope you don't mind me emailing you but i wanted to tell you that your resource page is great. I teach a women's health course...it has been so helpful in answering some questions during our pollution section....
Gracie L.
"CO2meter REALLY cares for their customers..."
I just wanted to write to thank the wonderful staff of CO2Meter.com.
I recently purchased a KL33-ELG sensor and data logger to be used in a NASA funded research project. As I was researching the many sensors on the market, i stumbled upon this website. With a very limited knowledge of NDIR sensors, the staff at CO2meter were incredibly helpful. Ray Hicks was very patient and easy to talk to. He consistently dedicated time to help my cause. Furthermore, Andrew Robinson provided speedy and effective updates when I inquired about a minor software patch.
Oh and I nearly forgot to mention that I ONLY PURCHASED ONE SENSOR.
Considering the time and energy that the staff at CO2Meter dedicated to my project, I am dumbfounded. CO2meter REALLY cares for their customers, and I highly recommend both their products as well as their customer service.
Matthew Jui
"CO2 Meter Discovers Classroom Intruders"
Here is my story regarding the CO2 meter. I teach Environmental Science courses, which also include labs. One of the labs is based on CO2 monitoring on campus. Students have a netbook and a CO2 monitor, and perform two different kinds of tasks.
The first one consists of measuring CO2 concentrations in different locations. They have to make assumptions about what concentrations they will find, make measurements, and then try to find the explanations for the results.
The most interesting part consists of exploring height dependence of CO2 in large spaces – tall hallways including stairs, our large Atrium which includes a 3 story-high living wall (a wall covered with plants), or in narrow spaces such as staircases. This really stimulates critical, scientific thinking, and imagination – to find interesting spaces and reflect on the physical processes occurring there.
We had quite a few surprises. For instance, we measured CO2 in a classroom, right after the class was over, and 120 students were streaming out. We thought we would find really high CO2 values. The result? 400-450 ppm, which is quite close to what we measure outside! The ventilation system, which includes an air exchange effect of the living wall, seems to work very well.
The second task is more exciting: it concerns CO2 over time. We monitor CO2 continuously, and see how the concentration changes when we open a window in a room with no ventilation. We compare what we find at the floor level, with the curves recorded higher up - 1 metre, 2 metres, close to the ceiling, etc. Fascinating pedagogical material.
However, this is how I got to have another surprise. I left the CO2 monitor on in my office, with the intention of recording the concentrations over a longer time interval – a couple of days. I could see the typical pattern of concentration increase while I was working in there, and a low decrease after I left, etc.
I was shocked when, one morning, when analyzing the data, I could see the same type of curve – recorded overnight! It was clear to me that somebody must have breathed in there! I contacted campus security, and they confirmed that a janitor had worked in my office (cleaning/waxing the floor or something like that).
Anyway, I found it funny that you can actually use a CO2 meter as a security device! When did you ever hear of a thief wearing an oxygen mask?
Dr. Cristian SuteanuSaint Mary's University
"Your meters and your staff have been easy to work with..."
I just wanted to write and thank you for your help with our CO2 measurement needs.
We are working on a research project to use CO2 from power plant emissions to grow algae for biofuel production. One of our key priorities has been to determine how much CO2 we could strip from the flue gas.
Your meters and your staff have been easy to work with. We have especially appreciated your help in resolving issues with a faulty transformer and helping us to get going again.
S. D.Salt Lake City, UT
"My CO2 Meter Story"
Recently I bought a CO2 meter designed by a nice guy named Ray, mostly for measuring the CO2 content in our waterjack incubator. It's a nice meter, easy to use and has good repeatability.
Our CO2 incubator has humidity as high as 97%, so one day, I found water coming from the outlet of the meter, and I decided to dry it. I connected the meter inlet to an air source at our lab, blew for about 1 minute until there waw no water from the outlet. Very sadly after this, I found the meter is dead - it can not read CO2 content at all.
I was afraid I had damaged it. I called Ray and told him how fragile his meter is. He told me that this machine should be very rugged because it uses a theory when a certain density of infrared light passing CO2, the content of CO2 will effect the density of the infrared light. He asked if I would open the case to check what happened.
I opened the case and found the tubing was blown off the chamber inlet. I refered to the specifications of the meter, the maximum pressure of the meter is 500 mbars which is equivalent to 7.25 PSI while the air source pressure is 50 PSI.
I hope no other CO2 meter user will copy my stupid way to dry their CO2 meter. Use a humidity filter or just the room air to blow away the water.
YC
Los Angeles, CA
Editor's Note: We understand...we've done this once or twice ourselves
"Thank you so much for offering a reliable, economical, CO2 meter!"
One of my hobbies is horticulture. It has been a passion of mine since I was very young. My wife and I are now both avid gardeners and greenhouse enthusiasts.
In the quest to find better ways to enhance the grow environment of our greenhouse, I decided I was going to need to monitor the levels of CO2 in the air. I went to my local garden stores to find a solution. I came to find out what I was looking for was going to cost me somewhere in the range of $500-$900 and more, ouch!
Not one store sold a low cost, accurate, CO2 meter. It was kind of hard to believe. I knew there had to be a low cost CO2 monitoring device out there somewhere.
After searching around on the internet, I came across your site and was delighted to find a great line of CO2 meters. I was very relieved to find the price was within my budget as well! I placed my order for the AQ100 CO2 meter (co2 only).
After a couple of days I received my new meter. The first thing I did was plug it into every room in my house to see how our indoor CO2 levels were. I discovered we need better ventilation..Then installed it in the greenhouse..
This meter works flawlessly! Thank you so much for offering a reliable, economical, CO2 meter!
Luke M.
Orange County, CA
"Thank You!"
"Thank you for all you have done to help me get this item replaced! I truly appreciate it!"
Lena
"I found yet another use for my CO2 meter...pest control."
"Last year I purchased one of your CO2 meters for my indoor garden. It’s important for me to keep my CO2 levels between 1200 ppm to 1500 ppm to optimize my plant growth. CO2 levels are always changing as occupants enter and leave the room. The amount being used varies with the size of the plants and the tank solenoid valves are not always the most accurate. The only way I could be confident in the amount of CO2 in my room was to purchase a CO2 meter.
Then several months ago my garden was invaded by spider mites, fungus gnats and white flies. I am an organic gardener and didn’t want to use any non organic sprays on my plants, but the organic sprays are not as effective and still damage the plants. I then remembered reading an article where CO2 was used to control pests.
I raised my CO2 to 10,000 ppm for four hours, to my delight all of the spider mites, fungus gnats and white flies were dead on the floor of my garden. I then repeated the process 5 days later after any eggs had been given a chance to hatch and I have been bug free ever since.
I found yet another use for my CO2 meter...pest control."
Jeff in Colorado
"The aSense GH is a Perfect Fit For My Clients."
"I spent the better part of a month looking for a good CO2 transmitter to use in a few green houses we are working on. I wanted a sensor with a nice moisture resistant housing that could tie right into my logic controller with either 0-10V or 4-20Ma output.
The aSense GH is a perfect fit for my clients. It has an incredibly accurate CO2 transmitter and a temperature transmitter as well. The unit has been installed for a few months now and is working perfectly. I couldn't have asked for a better unit.
Thanks guys!"
Matt Berk, President
Current Installations
Denver, CO
"I don't often find the excellent level of tech support like you provide!"
"thanks for the quick reply and great information. I don't often find the excellent level of tech support like you provide!
It was incredibly easy to capture and parse the output string from the SenseLife CAM using your instructions. Keep up the great work!"
Ken Stutzman
Windsor, Colorado
"The K30 was probably the easiest of all to implement..."
"For our Senior Design group project in hydroponics, we had quite a few sensors to implement, some with associated circuitry and others that were easily implemented into the overall system.Actually, the K30 was probably the easiest of all to implement considering the design and "pre-programming" your company offers.
We appreciate the support of your company and would like you to know that your sensor helped play an integral part in our understanding of sensors and their system integration. Thanks!"
Doug Cooper
Engineering Student
University of Central Florida
"CO2 meter is essential."
"This is fantastic. It took me two months to finally figure out where 1,700 ppm levels were coming from in our house. It's the damn oven pilot lights in our brick, aluminum frame windows, sealed tight sometimes. Accounts for backaches and tiredness and earaches.
Until I get the hang of it, monitoring CO2, wind speed and direction, venting windows, carbon filters, and exhaust fans appropriately, I feel like a sea captain in the 1800s, looking for that clean air. But I think it will work out well.
Took a lot to figure this out, decades in fact, and I'm a radical, environ- mentally aware, science type. CO2 meter is essential. Should be taught in grammar school."
Jim
New York, NY
"It was so easy to communicate"
"The K-22 CO2 sensor is excellent to use in a research lab application. The PWM chip allowed us to seamlessly integrate with PIC microcontrollers to make a closed control loop.
It was so easy to communicate between the K-22 PWM and the PIC circuit, I will definitely be looking to this line of products (CO2 as well as others) in further sensing applications.
Thanks!"
Westbrook Weaver
Engineering Department UCLA
"CO2 sensors...do their job exactly as advertised."
"Your CO2 sensors are very nice, carefully made, and do their job exactly as advertised. All I needed to turn them into a portable meter was a package and a display, which I had no trouble making. I found the support staff both prompt and helpful, and am a satisfied customer."
Hal Lewis
Emeritus Professor of Physics
University of California, Santa Barbara
"I'm amazed at how sensitive the monitors are."
I bought a SenseLife TIM8 CO2 Monitor last summer. The monitor has been very valuable to me in issues regarding ventilation in my surroundings and I am really happy with the monitor...I'm amazed at how sensitive the monitors are and how quickly they show changes in the CO2 level."
L.T., Kentucky
"It took me about 20 minutes to figure out how to e-mail CO2 levels."
"The K-30 devkit is pretty awesome. It took me about 20 minutes to figure out how to e-mail CO2 levels to my Blackberry."
A.R., Michigan
Do you have a comment or a testimonial you'd like to share? Send it to us using the contact form and if we print it we'll send you a CO2Meter for free!