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How to Use Airlife Peak Flow Meter: Operational Manual and Mouthpiece Safety Handling Requirements
Quick Answer: The Airlife peak flow meter measures peak expiratory flow in liters per minute. Users must inspect the mouthpiece for cracks and moisture before every test. For industrial gas or liquid flow measurement, send Silver Automation Instruments your pressure in bar, temperature in °C, pipe size DN, and flow range.
1. Intended Use and Operating Range
The Airlife peak flow meter is built for respiratory checks in clinics, asthma management, and occupational health screening. The standard scale covers 60 to 800 L/min. This range is not an industrial process range but it works for spot checks where air flow is small and manual reading is enough.
In industrial sites we see a different requirement. A beverage plant in Vietnam needed a nitrogen flow meter for blanketing tanks. Their pipe size was DN15 and flow rate was 2 to 20 kg/h. We recommended a thermal mass flow meter with 4-20 mA HART output.
2. Step by Step Operating Procedure
Slide the marker to the zero slot before the test. Attach a clean dry mouthpiece to the inlet. Stand up or sit straight. Take a full breath. Seal your lips around the mouthpiece. Blow out as hard and fast as possible for one second. Read the number closest to the marker. Record the value. Repeat the test three times and use the highest of the three readings.
Do not cover the back vent with your fingers. Do not block the mouthpiece during the blow. A weak seal around the mouthpiece often gives a low reading. Most engineers skip this part on their own units and then blame the meter. In practice, the seal is the first thing to check.
3. Mouthpiece Safety Handling Requirements
Use only an Airlife mouthpiece or a medical grade equivalent. Do not share a mouthpiece between users unless it is a reusable type and has been sterilized. Disposable mouthpieces are single use only. Reusable mouthpieces need washing with warm water and mild detergent. Then soak in 70 percent isopropyl alcohol for 10 minutes. Air dry on a clean paper towel.
Inspect the mouthpiece for cracks, chips, or moisture before each test. A damaged mouthpiece can produce a false low reading and can trap contamination. Store the meter and mouthpieces in a dry cabinet at 5 to 40 °C. Keep the unit away from diesel, solvent, or silicone vapors. Those vapors can make the internal vane stick.
4. Calibration and Field Spot Checks
The Airlife peak flow meter is a mechanical device. Check the pointer movement before each shift. The pointer should drop back to zero without sticking. If the pointer sticks or the scale window is cracked, replace the unit. Do not apply oil or grease to the shaft.
5. Common Errors and Field Notes
A low result often comes from a weak lip seal or a wet mouthpiece. Repeat the test three times. The highest value matters. Variation under 10 percent means the test is reliable. In practice, values above 20 percent variation mean the user needs more training. Here is the thing, most facilities ignore this repeatability check. That leads to wrong action plans and unnecessary equipment changes.
6. Industrial Flow Meter Options from Silver Automation Instruments
The Airlife peak flow meter is not an industrial process meter. For gas or liquid flow in pipelines, Silver Automation Instruments supplies Coriolis mass flow meters, electromagnetic flow meters, ultrasonic flow meters, vortex flow meters, oval gear flow meters, thermal mass flow meters, pressure transmitters, and paperless recorders. Typical inputs include DN15 pipe size, PT100 temperature sensor, 4-20 mA HART signal, ATEX Zone 1 housing, cP for viscous fluids, and µS/cm for water conductivity.
For a compressed air line at 7 bar, ambient temperature 25 °C, pipe size DN25, and flow range 5 to 50 kg/h, we would recommend a thermal mass flow meter or a vortex flow meter. Send us those four values. We can return a quote within one business day.
Contact Silver Automation Instruments: Tel +86-25-68650347, Whatsapp +86-25-52155837, WeChat +86 15365082610. Website flow-meter.com.au and silverinstruments.com.
FAQ
What is the measuring range of the Airlife peak flow meter?
The standard adult unit covers 60 to 800 L/min. Pediatric versions have a lower range. Check the scale on the front window before use.
Can I reuse the mouthpiece?
Disposable mouthpieces are single use. Reusable mouthpieces need washing with warm water and mild detergent, then 70 percent isopropyl alcohol for 10 minutes. Air dry before storage.
How often should I check the unit?
Check the zero position and pointer movement before each shift. A full validation against a calibrated reference should be done once a year or after any impact.
What is the correct posture for the test?
Stand up or sit straight. Keep the meter horizontal. Seal lips around the mouthpiece. Blow out as hard and fast as possible for one second.
Does Silver Automation Instruments sell the Airlife peak flow meter?
No. Silver Automation Instruments supplies industrial flow meters, pressure transmitters, and paperless recorders for oil and gas, water, chemical, food and beverage, and marine applications.
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