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AirLife Asthma Check Peak Flow Meter Chart: Target Action Plan Green Zones in Industrial Flow Monitoring
Quick Answer
Quick Answer: AirLife asthma check is a medical peak flow meter for patients. The same green zone target action plan logic can help industrial plants monitor gas, liquid, and steam flow. Silver Automation Instruments supplies industrial peak flow meters for compressed air, nitrogen, steam, and water lines from DN15 to DN300.
What the Green Zone Means on an Industrial Peak Flow Chart
Most engineers skip this part until a compressor trips or a pump runs dry. In practice, the green zone is the flow range where the process runs stable. The green zone is not a fixed number from a manual. The green zone comes from real production data.
A compressed air line in a packaging plant may run at 8 bar and 140 kg/h. The green zone for that line could be 120 kg/h to 160 kg/h. If flow drops below 90 kg/h, air demand is low or there is a leak. If flow rises above 180 kg/h, a valve may be stuck open or a new machine was added without notice. The yellow zone is a warning. The red zone means stop the batch and check the line.
Peak Flow Meter Selection for Green Zone Monitoring
Do not use one meter type for every fluid. For compressed air and nitrogen, a thermal mass flow meter works well. That meter reads mass flow directly in kg/h and has no moving parts. For steam, a vortex flow meter is a better fit. A vortex flow meter handles high temperature up to 250 °C and gives a frequency output for 4-20 mA HART integration. For water and wastewater, an electromagnetic flow meter is standard. That meter needs a minimum conductivity usually above 5 µS/cm.
We have seen customer sites where a wrong meter type was installed. A paint manufacturer in Southeast Asia used a turbine meter on compressed air with oil mist. The bearing failed in two months. After the plant switched to a thermal mass flow meter, the peak flow chart stayed in the green zone and maintenance stopped.
How to Build a Target Action Plan Green Zone
Start with normal production data for three to five days. Record flow, pressure, temperature, and pipe size. For a DN50 compressed air line, note flow at start of shift, middle of shift, and shutdown. Use the middle 80 percent of readings as the green zone. Use the next 15 percent as yellow. Use the outside 5 percent as red.
Because ambient temperature changes can shift readings, the green zone is not static. A site in Saudi Arabia may need a wider green zone in summer. A plant in Malaysia with high humidity may see different water content in the air. Review the chart every quarter.
Why a Peak Flow Chart Without a Meter Is a Problem
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Some plants have a chart but no live flow signal. The operator fills in numbers from a gauge once per shift. That data is often late and wrong. Last year a customer in Vietnam asked us about slow pneumatic valves. The pressure looked normal. The problem was peak air flow during two minutes of each cycle. A pressure gauge did not show the problem. A thermal mass flow meter showed a 45 percent flow spike. That spike pushed the system into the red zone twice per hour.
Recommended Models and Output Signals
For gas peak flow from DN15 to DN100, Silver Automation Instruments recommends a thermal mass flow meter with 4-20 mA HART output. The meter can measure from 0.5 to 300 kg/h depending on pipe size. For steam from DN25 to DN200, a vortex flow meter with optional ATEX Zone 1 approval works well. For water lines from DN25 to DN300, an electromagnetic flow meter with PT100 temperature measurement gives stable readings.
Send us your pressure in bar, temperature in °C, pipe size in DN, and normal flow range in kg/h or m3/h. We will recommend one model with a green zone target action plan for your process.
FAQ: Peak Flow Meter Chart and Target Action Plan Green Zones
What is a peak flow meter chart in industrial use?
A peak flow meter chart is a simple visual range that shows normal flow, warning flow, and trip flow. Green means normal, yellow means warning, red means stop. Operators use the chart to make fast decisions without reading raw mA signals.
How do I set the green zone for a compressed air line?
Record normal production flow for three to five days. Take the middle 80 percent of readings. Avoid startup and shutdown data. Review the range quarterly because ambient conditions change.
Which flow meter works best for steam peak flow monitoring?
A vortex flow meter is the usual choice for steam. It handles high temperature up to 250 °C and gives a stable reading. Specify pipe size, pressure, and temperature for sizing.
Can I use one flow meter type for gas and liquid peak flow?
No. Gas and liquid have different density and conductivity. A thermal mass flow meter suits gas. An electromagnetic flow meter suits conductive liquid. A vortex flow meter can handle steam and some gases but check the Reynolds number.
What details should I send for a quote?
Send pressure in bar, temperature in °C, pipe size in DN, and flow range in kg/h or m3/h. If the fluid is not water or air, include viscosity in cP or conductivity in µS/cm.
Contact Silver Automation Instruments for peak flow meter selection. Tel: +86 25 68650347. WhatsApp: +86 25 52155837. WeChat: +86 13512131526.
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