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How to Calibrate a Piusi Flow Meter on a Fuel Skid
Quick Answer: Calibrate the Piusi flow meter by entering the correct K-factor or digital scale factor into the batch controller or PLC. On fuel skids, use a reference container or weigh scale to compare displayed volume against actual volume. Adjust the scale factor until the totalizer matches the reference within tolerance.
Fuel skids across Southeast Asia, the Middle East, and Africa use Piusi turbine meters for diesel, petrol, and kerosene transfer. The meter outputs pulses. The controller converts pulses to liters through a scale factor. If the scale factor drifts or is entered wrong, the batch total is wrong. This guide covers field calibration and scale factor programming.
What You Need Before Calibration
Use a calibrated reference meter or a certified weigh scale. A 20 liter container is enough for most field checks. Note the fuel temperature. Diesel volume changes about 0.09 percent per degree Celsius, so a 7 degree Celsius shift is not a real meter error. Record the current scale factor first. Most controllers show it as pulses per liter, PPL, or K-factor.
Confirm the pulse wiring. A Piusi turbine meter usually sends a square wave or reed switch pulse. Connect it to the pulse input, not the 4-20 mA HART channel. Pressure and temperature sensors use the analog channels. The flow totalizer uses the pulse channel.
Step 1. Run a Base Volume Check
Fill a known 20 liter container at the normal delivery rate. Compare the controller display against 20.0 liters. If the display reads 18.7 liters, the meter is underreading by 6.5 percent. Repeat the test twice. Keep the discharge hose full to avoid air. Air bubbles in diesel or petrol add false volume and cause a high reading.
Step 2. Calculate the New Scale Factor
Use this formula. New scale factor equals the old scale factor multiplied by actual volume and divided by displayed volume. Example: old factor 51.00 pulses per liter, actual volume 20.0 liters, displayed volume 19.2 liters. New factor is 51.00 times 20.0 divided by 19.2. The result is 53.13 pulses per liter.
Here is the thing. A higher scale factor increases the displayed volume. Do not jump by more than 1 to 2 percent at a time. In practice, many field errors come from a wrong scale factor, not from the meter body.
Step 3. Program the Digital Scale Factor
Enter the new value into the controller setup menu. Some panels call this parameter scale, factor, or pulse value. Save the setting. Cycle power once and confirm the value stays in memory. Then run the 20 liter test again. The display should now match the actual volume within plus or minus 0.5 percent for diesel and 1.0 percent for petrol depending on pump pulsation.
Step 4. Verify Across the Flow Range
So most engineers skip this part. A meter can be accurate at 60 L/mi
Common K-Factor Ranges on Piusi Fuel Skids
Piusi K24, K33, and K44 turbine meters may carry K-factors from 20 to 400 pulses per liter depending on DN and rotor design. A DN25 diesel meter often sits near 30 to 60 pulses per liter. A DN40 petrol meter may run near 60 to 120 pulses per liter. Use the value on the meter body or calibration sheet as the starting point. Do not use a diesel K-factor for petrol without a field check.
When Recalibration Does Not Fix the Fuel Skid
We have seen this on customer sites many times. Last year a diesel reseller in Surabaya Indonesia had a Piusi K33 totalizer drift by 3 percent every two weeks. Recalibration did not hold. The rotor had worn edges from dirty diesel. The correct action was replacement with a new turbine flow meter or an oval gear flow meter for diesel. Silver Instruments supplies both types with pulse output and the same scale factor programming logic.
For a DN25 diesel fuel skid between 20 and 120 L/min, select a Silver Instruments turbine meter with pulse output and 0.5 percent accuracy. For higher viscosity diesel or biodiesel blends, an oval gear flow meter from Silver Instruments gives better repeatability.
FAQ
Can I calibrate a Piusi flow meter without removing it from the fuel skid? Yes. Calibration is mainly a controller setting. You need a reference container and stable flow. No disassembly is required.
What is the difference between K-factor and digital scale factor? In field language they are the same. K-factor is pulses per liter. The controller uses that number to convert pulse count into volume.
Why does my Piusi meter read low at low flow? Turbine meters can underregister at low flow because rotor slip increases. Keep the flow above the minimum linear range. For DN25 skids this is often 5 to 10 L/min.
Does fuel type affect Piusi calibration? Yes. Diesel, petrol, and kerosene have different viscosity and density. Calibrate with the same fuel you deliver. A diesel K-factor on petrol can shift the reading.
What accuracy is realistic after scale factor correction? A healthy Piusi turbine meter on a fuel skid can hold plus or minus 0.5 percent. If the meter is worn or air is present, accuracy may drop to 1.5 percent or worse.
Need a fuel flow meter or a Piusi replacement? Send us your fuel type, pressure in bar, temperature in °C, pipe size in DN, and flow range in L/min. We will recommend a turbine or oval gear flow meter for your fuel skid.
Contact Silver Automation Instruments. Tel: +86-25-68650347. Whatsapp: +86-25-52155837. WeChat: +86 15365082610.
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