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Asthma Peak Flow Meter Chart: Free Printable PDF Target Graph
Quick Answer: A peak flow chart helps track forced expiratory volume in asthma patients. Silver Instruments designs industrial-grade peak flow meters for gas and liquid batching where you must record the highest instantaneous flow rate. Download our free printable PDF graph to log peak mass flow or volumetric flow. Send us your pipe size and gas type and we will recommend a meter with 4-20 mA HART output that captures peak values automatically.
Why you need a peak flow chart outside of the medical clinic
Most engineers skip this part. When you hear peak flow meter you think of a plastic device a doctor hands to a child. But in a gas distribution station outside Bangkok or a biogas line in Kenya we talk about peak flow for a very different reason. The peak flow tells you the maximum flow rate your pipe saw during a 24-hour shift. Compressor stations, nitrogen purging rigs, and steam injection lines all need that number logged. Without it you cannot size relief valves or spot a leak downstream. A paper chart or a free PDF graph still makes sense because a lot of SCADA screens in SME plants do not capture true peak hold data. You write it down every two hours. Then you see the spike.
What the printable PDF actually contains
Our free target graph is a single A4 sheet. Time runs along the bottom in 15-minute blocks over a 24-hour window. The vertical axis has two scales. One scale reads in kg/h for thermal mass flow meters on natural gas or compressed air lines. The other scale reads in m³/h for vortex or turbine meters on steam or water. A shaded band marks the safe operating zone based on DN50 schedule 40 pipe and 8 bar air at 25 °C. You fill in the measured value with a pen. In practice a night shift operator in a food plant in Vietnam draws a dot every hour. By 6 AM you have a visual trend. If the line drifts into the upper red zone someone calls maintenance before a coupling fails.
How Silver Instruments meters feed the chart
We build thermal mass flow meters and vortex flow meters that output a 4-20 mA signal proportional to flow. You can connect that signal to a simple panel meter with a peak hold function. Our model SIT-600 thermal mass flow meter comes with a local display that cycles through actual flow, totalized flow, and the maximum flow since last reset. Write that number directly onto the PDF chart. Reset it at midnight. No laptop needed. A customer in Nigeria does this for his diesel generator fuel supply line. He uses a Silver Instruments oval gear flow meter with a pulse output. Every pulse equals 0.5 liters. A cheap counter calculates the peak hourly consumption. He plots it on our printable graph and emails a photo to the procurement manager. That one habit cut his diesel bill by 8 percent in three months.
Step‑by‑step setup for a gas peak flow station
First, pick a location straight downstream of a pressure regulator. You want at least 15 DN of straight pipe before the meter and 5 DN after. For a 2-inch line that means 760 mm of clear tube. Install a Silver Instruments vortex flow meter with an integrated PT100 temperature sensor. Set the 4‑20 mA output to represent 0 to 400 kg/h for compressed air at 7 bar. Wire
Why a printed chart still beats a spreadsheet in 2025
Here is the thing. In a dusty bottling hall in Mexico or on a fishing vessel off the coast of Chile a tablet screen goes black when wet fingers touch it. Laminated paper does not. An A4 sheet pinned next to the flow meter gets filled even when the Wi-Fi drops. Auditors from a French multinational walked into a chemical plant in Surabaya last year. They accepted our handwritten peak flow charts without any comment. They just photographed them. Because the serial number of the Silver Instruments meter was written at the bottom, the date matched the shift log, and the ballpoint ink was real ink. That is compliance on a budget.
Parameters we need to send you the right meter and chart
We keep this straightforward. Tell us the fluid: compressed air, natural gas, steam, diesel, or demineralized water. Give us the pipe inner diameter in mm or just the DN. State the normal operating pressure in bar and temperature in °C. Mention the approximate peak flow you expect: kg/h, m³/h, or L/min. If you already have a 4‑20 mA loop or a Modbus RS485 port, tell us. We will return a quotation for a Silver Instruments flow meter that outputs the signal you need for your peak flow chart. Email those five values to [email protected]. We typically reply within three business hours during South East Asia working time.
FAQ
Can I get the PDF chart in metric units only? Yes. The default PDF shows bar and °C and kg/h. If you need psi and °F and lb/h just write “US units” in the email subject line. We will mail you the version you need.
Which flow meter shows peak flow live without a chart? Our SIT-600 thermal mass flow meter stores the maximum mass flow in a non-volatile register. You can read it on the built‑in LCD or poll it via RS485. The printable chart is a low‑cost backup that requires zero training.
Does the oval gear meter work for peak flow measurement of heavy fuel oil? It does. We have units running on IFO 180 in a marine application in Singapore. The peak flow function relies on the pulse output and a dedicated totalizer. Supply your viscosity in cP and we will check the clearance.
How often should I reset the peak hold value? Every 24 hours is common. Some sites reset every shift. The PDF graph has space for a full day at 15‑minute resolution. If you need a 7‑day chart we can email a longer template.
Can Silver Instruments calibrate the meter for peak flow accuracy? We calibrate every mass flow meter on a gravimetric rig traceable to ISO 17025. The accuracy at peak flow is stated on the certificate. A typical thermal mass meter holds ±1.5 percent of reading plus ±0.5 percent of full scale at the maximum flow you will ever see.
Direct line: +86-135-1213-1526 | WhatsApp: 86-135-12131526 | WeChat: +86 13512131526 | [email protected]. Reach us for your free peak flow chart PDF and a matching Silver Instruments flow meter.
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