When used correctly, peak flow meters are excellent tools that reflect the state of the child's asthma - but you need to treat the device with respect. Keep it clean, use it as directed, check it frequently for damage, and it will give accurate measurements. However, remember that symptoms are just as important as numbers. In some cases, children can get a good peak flow "score" even when they are having symptoms. If that's the case, make a note of the numbers and talk to your doctor.

The Sierra flow meters are regularly used in these conditions without noticeable problems. This is because the design of the flow meter is such that conditioning elements within the flow meter virtually eliminate the sensitivity to such pulsations. Many other flow technologies, such as "Delta Pressure" devices suffer from sensitivity to pulsations because the flow is not conditioned prior to measurement.

Every single 800 Series Sierra Flow meter is calibrated on a Primary Standard. Sierra does NOT use transfer standards. We can not stress how beneficial this is to YOU as the end user! The reason nobody else calibrates EVERY meter on a Primary Standards because the cost to calibrate Flow Meters with Primary Standards is IMMENSE however it is TRULY the ONLY way any company manufacturing Mass Flow Meters with accuracies of 1% or better could justifiably make such claims of accuracy.

Your GP should inform you of what your reading should be. You can also calculate your normal values by clicking here or you can download the normal values chart by clicking here

You should talk to your doctor about exactly what to do, but in general, if your peak flow drops by 20% your doctor will generally suggest medication changes. If it drops by 50%, a more intense treatment regimen may be needed.

Depending on which mouthpieces you are using your Peak Flow or In-Check should be cleaned regularly. If you are using Disposable One-Way Valve Mouthpieces or Disposable Bacterial Filters you should clean the devices on a weekly basis. If you are using Disposable Two Way Mouthpieces or Universal Sterilisable Mouthpieces the devices should be cleaned after every use

A peak flow meter is a device you can easily use at home to check how open your airways are. It can help you keep track of how well your asthma is controlled. You use it by taking a deep breath and blowing hard into a plastic piece that goes in your mouth. Then, write down the resulting number that appears on the meter. Peak flow meters are most helpful for people with moderate or severe asthma.

Pocket size lamp meters provide a comparative reading, not an absolute reading. They are helpful when comparing original readings to current readings. Each manufacturer calibrates their meter to give you a reading relative to the original calibration. Therefore, each brand will give you different readings. UV meters only read from a small portion of the spectrum of UV light. Different lamp manufacturers design their lamps to emit UV rays from a particular section of the spectrum.

Yes. Meters are factory tested and calibrated to be within accepted standards of accuracy. Moreover, the utility must maintain its meters within those accuracy standards specified in the Utility Tariffs.

With the end of the discharge line horizontal, measure in inches horizontally from the top of the pipeline as distance where the vertical elevation to the top of the flow coming out is 12 inches. The equation is GPM = 0.818 x the ID of the pipeline in inches squared x the horizontal distance measures in inches. Example: the pipe ID is 10 inches, the horizontal distance is 24 inches. GPM = 0.818 x 10 squared x 24 = 1,963 GPM.

There have been relatively few problems with the meters. In fact, the meters in homes probably under read by 3%. This is an allowable standard and is factored in when setting the rates for water consumption.

long as the wood is not frozen solid and remains conductive, a pin-type meter will give reliable readings. However, most instrumentation, unless specifically designed for extreme weather conditions, will not work well in constant sub-freezing temperatures.

A short-term flow monitoring study is a "snap-shot" in time, whereas a permanent flow monitoring program will provide system information over a longer period. Both programs provide vital system information; however, a long-term program will provide the added benefit of historical trending.

Design drawings are useful to assist in understand the system layout. However, field measurements need to be made prior to the flow monitoring installation to insure accuracy.

We use bars to symbolise volume of air. We also feel bars provide an easier way of identifying peak flow changes and are less confusing than conventionally used dots with lines. Our design also demonstrates clearly the difference between the morning and evening trends.

A 13: Without ramp meters, many cars try to merge on to the freeway at once. Drivers on the freeway slow down to let the cars enter, and these slower speeds quickly cause backups. If cars enter the freeway in a spaced, controlled manner, they merge easier and with less disruption to mainline traffic. A short wait on the ramp allows drivers to increase their average freeway speed and shorten freeway travel times.