Can the InspectAir™ CO2 Monitor measure time weighted averages (TWA's)?
Yes. The user would manually start and stop a sample. The statistics for that sample will include the average during the sample period. The information is not presented as a STEL or TWA. It is merely the average for that sample period.
Does the InspectAir™ CO2 Monitor have an alarm?
The InspectAir™ CO2 monitor has both audible and visual alarms at two programmable levels. The alarms are preset at the factory to 1% and 1.5% (10,000 ppm and 15,000 ppm). They are easily changed by the user.
Does the InspectAir™ CO2 Monitor log data?
The InspectAir™ CO2 monitor does not log individual data points. It does record and print the maximum, minimum and average concentration. Since the instrument does not have a clock, it can not tell you when these levels occurred, only the magnitude of the occurrence.
How can non-USA customers get calibration gases?
TSI is not able to ship calibration gases internationally. How to Obtain Calibration Gas in non-USA Locations TSI is not able to ship calibration gases internationally due to international transportation regulations. As such we provide a means for our international users to obtain calibration gases through local TSI distributors or directly from the specialty gas manufacturers. The information below contains the calibration gas and regulator specifications for the following TSI instruments;* Q-Trak™ and Q-Trak™ IAQ Monitors* InspectAir™ CO2 Monitor* IAQ-Calc™ Indoor Air Quality Meter (Models 8732, 8760 and 8762)* CombuCheck™ CO2 Meter* CA-Calc™ Combustion Analyzers (all models)* Q-Check™ CO2 and CO MetersAlso, a recommended listing of international gas vendors capable of shipping directly to distributors or users is included.Note: these calibration gases and accessories must be purchased directly from the listed vendors, not from TSI-USA; and that TSI-USA does not warranty, guarantee the quality or availability of these calibration gases obtained directly from these specialty gas vendors.Q-Trak™ IAQ Monitors use a 0.3 to 0.75 L/min regulatorSpan Calibration Gases * 1000 ppm CO2 in balance air** 5000 ppm CO2 in balance air* 35 ppm CO and 1000 ppm CO2 in balance air* 35 ppm CO in balance air* 200 ppm CO in balance airZero Gas * Zero Calibration Gas (air*) for CO2 and CO sensor calibration
How do I select between PPM and % on the display?
You can toggle between ppm and % by changing a DIP switch. The DIP switches are located in the battery compartment.
How does the sensor work?
The sensor depends on the absorption of light by the CO2 molecules. A light inside the sensor is turned on and off. The CO2 molecules absorb infra red light at wavelengths around 4.26 µm. The amount of light absorbed at the 4.26 µm wavelength is proportional to the number of CO2 molecules present in the sensor. For a detailed explanation refer to Application Note TSI-037 which discusses this technique in detail.
How long can I leave the InspectAir™ CO2 Monitor in unattended operation?
The InspectAir™ CO2 monitor will operate on alkaline batteries about 13.5 hours and on NiCd batteries about 4.75 hours. It will operate indefinitely on the AC adapter which is included with the instrument.
How long does it take to calibrate?
The InspectAir™ CO2 Monitor can be calibrated in the field in less than 5 minutes.
How often do I need to measure CO2?
The frequency of measurement depends on the dynamics of the situation. A measurement should be made periodically and whenever the occupants of an area complain of the symptoms associated with over exposure. Measurements should also be made in accordance with OSHA's confined space regulation.
How should I dispose of empty calibration gas cylinders?
Calibration gas cylinders supplied by TSI are disposable. You may be required to dispose of these cylinders as hazardous waste. Refer to local, state, or federal regulations.
What are the symptoms of over exposure to CO2?
The early symptoms are headache, dizziness and restlessness. Higher concentrations can cause increased heart rate, pulse pressure and blood pressure. Occasionally convulsions can occur. Eventually the exposure can lead to coma and asphyxiation.
What are the upper limits for occupational exposure to CO2?
The allowable exposure limits vary slightly among government agencies. The levels are shown in the table below. In addition, NIOSH recommends supplied air respirators or self contained breathing apparatus if exposures are above 50,000 ppm (5%). 8 Hour TWATime Weighted Average15 Minute STELShort Term Exposure LimitIDLHImmediately Dangerous to Life and HealthOSHA PEL 5,000 ppm (0.5%)30,000 ppm (3%)50,000 ppm (5%)NIOSH REL 5,000 ppm (0.5%)30,000 ppm (3%)50,000 ppm (5%)ACGIH TLV 5,000 ppm (0.5%)30,000 ppm (3%)50,000 ppm (5%) International regulatory organizations have limits in the same ranges. In Germany the Technical Rules with the TRGS 900 and TLV level of 0.5% CO2 apply as well as the TRGS 402 short term level of 1% volume CO2 for 60 minutes.
What equipment do I need to calibrate?
You will need a zero gas (N2) and a span gas (3% CO2). You will also need a regulator and tubing to transfer the calibration gas to the instrument. Everything needed for calibration is included in the TSI Model 800705 calibration kit.
What is the life of the sensor?
The life is estimated to be more than 10 years. The NDIR sensor (Application Note TSI-037, "NDIR CO2 Sensing Technology" is all solid state so there are no parts to degrade or wear out.
What is the recommended service interval?
The recommended service interval for all TSI instruments is one year.
Why would I measure CO2 when I already measure oxygen?
Hazardous levels of carbon dioxide are seen long before oxygen becomes deficient. The normal oxygen level is 21.9% and oxygen deficiency is defined as less than 19.5%. If the CO2 concentrations increase to the TWA (5,000 ppm) or STEL (30,000 ppm), this represents an oxygen level of 21.8% and 21.3%, respectively. In fact, by the time the oxygen concentration gets down to the IDLH level, the CO2 concentration reaches 11 times the PEL (110,000 ppm). If the area of concern has a history of high carbon dioxide excursions, then measuring carbon dioxide instead of oxygen can give the earliest warning of hazardous conditions.