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Confined space 4-gas monitors need to be calibrated. We all know it, and the time is probably coming up soon. Just how often you are required to calibrate depends on you and the recommendations of the manufacturer. (See calibration intervals for more information.) There are several possible methods for tuning up your gas monitor, and whether you do manual calibrations, use an automated calibration and bump test device, or send it in for a professional calibration service is up to you. …

All gas monitors need to be bump tested, even if they don't require calibration. (Yes, that goes for you guys with single gas disposable monitors too.) To test your monitor you're going to need both calibration gas and a regulator. Your calibration gas mixture will be determined by the type of sensors in your gas monitor. Your regulator will have to fit your bottle of gas. Problem is there are a couple of different types of regulators, and it's not very intuitive figuring out which you'll …