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“For Good Measure”^®

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T.M.I.

Test and Measurement Instruments C.C.

CK 1985/007464/23

“Tomorrow’s Instruments Today” — “For Good Measure” ^®

TMI, Established—1982

English, Afrikaans, Portuguese Speaking. Master/Visa Credit Cards

Carbon Dioxide & Monoxide Meters

CO 2, CO Meters

Part No: GCH-2018

Carbon Dioxide Meter (CO2)/ Humidity / Temp / Dew Point, 0 to 4000ppm (1ppm), 0 to 50degC, 10% to 50degC, 10%to 95%RH (0.1%)

Lutron

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Part No: GC-2028

Carbon Dioxide Meter (CO2)/ Temp. 0 to 4000ppm (1ppm), 0 to 50degC, 10% to 50degC, 10%to 95%RH (0.1%)

Lutron

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Part No: GCO-2008

Carbon Monoxide Meter, (CO) and Temperature

Lutron

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Notes on Gas Instruments in General.

Gas instruments detect, monitor or analyse gases present in an environment. Detectors sense situations outside normal operating parameters and are set to alarm when these conditions are exceded. Monitors can also be set up to trigger an alarm, but their role is to determine which gases are in the sample being measured, and in what quantity they are present. Analyzers provide a breakdown of what is found, log the information, and can download it to a computer where further analysis and record keeping can be performed. Gas instruments and air instruments can sense sometimes just one gas or else can sense multiple types of gases with one instrument.

When analysing gases there are a few basic types of measurements that can be made. Percent LEL or lower explosive limit or lower flammable limit (LFL) of a combustible gas is defined as the smallest amount of the gas that will support a self-propagating flame when mixed with air (or oxygen) and ignited. In gas-detection systems, the amount of gas present is specified in terms of % LEL: 0% LEL being a combustible gas-free atmosphere and 100% LEL being an atmosphere in which the gas is at its lower flammable limit. The relationship between % LEL and % by volume differs from gas to gas. Another measurement is percent volume, which measures the amount of a specific gas within a sample. Trace measurement is usually given in units of ppm or ppb. Leakage and consumption rates can also be measured, as can gas density and signature or spectra, which is the spectral signature of the gases present.

Specifications for gas instruments are first what type of gas the application requires sensing and second how many channels the instrument needs to sense through. This can be for multiple types of gas sensors, redundant sensors for the same gas, or for placing sensors throughout a location to get sampling at many different spots. Other factors to consider are response time, maximum distance from leak that the detector can detect gases, and flow rate through the sensor.

Gas instruments can be detectors, monitors or analyzers. A gas detector will detect situations outside normal operating parameters. It is set up to alarm of this situation and covers gas leak detectors as well. A monitor is set up to alarm and determine which gases are present and in what amounts. An analyzer will analyze what is found, log the information and has the ability to download to a computer for further analysis.

These instruments can typically be handheld, larger portable devices or permanently mounted instruments. They have four primary purposes: personal exposure monitoring, air quality monitoring, confined space monitoring, and process gas monitoring.

General available features for gas instruments can include temperature and humidity measurements, external or internal sampling “sniffer” pump, interchangeable probes, alarm settings, controller functionality, self-calibration, data storage or logging, and usability in hazardous environments.

Indoor Air Quality.

As more energy efficient homes and buildings are built or modified, it is more important than ever to ensure healthy indoor air quality resulting in tightly-sealed, high performance building structures. There is a growing need to monitor air quality in schools, office buildings, greenhouses, factories, hotels, hospitals and anywhere that high levels of carbon dioxide are generated. Typical outdoor CO2 levels are <350ppm and safe indoor levels are <1000ppm. Without adequate ventilation, these levels could rise resulting in drowsiness (<2000ppm); headaches, sleeplessness, poor concentration, nausea (<5000ppm); up to a lack of oxygen (>5000ppm) which could cause health problems.

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Carbon Dioxide, Carbon Monoxide Meters

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Part No: CO2-9904SD

Carbon Dioxide Meter Real Time Data Logger Recorder (CO2)/ Humidity / Temp / Dew Point, Wet Bulb, 0 to 6000ppm (1ppm), SD Card, Sample time adj.

Lutron

Part No: PCO-350

Carbon Monoxide Meter, (CO) and Temp. 0-50C and 0-1000 PPMx 1 PPM. Fast Response, High Repeatability and accuracy with CO alarm setting. Data Hold.

Lutron

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Part No: COH-9902SD

Carbon Monoxide Meter Real Time Data Logger Recorder. CO,Temp, Humidity, Wet Bulb & Dew Point. 0-50C and 0-1000 PPMx 1 PPM. SD data to EXCEL directly.