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F300 Flow Meter Guide: Pitot Tube Type Flow Calibration for Fire Protection Systems
Quick Answer: The F300 pitot tube flow meter needs a zero and span verification against a 4-20 mA reference before fire pump flow tests. Field calibration for fire protection systems checks the differential pressure sensor, the velocity correction factor, and the analog output scaling. Silver Automation Instruments supplies the F300 with a 5 point calibration certificate and a QR code for the live test report.
Why Pitot Tube Flow Meters Fit Fire Protection Systems
Fire riser pipes have high static pressure and short straight runs. A pitot tube probe creates little pressure drop. The F300 probe is made from 316L stainless steel. It installs through a compression fitting on the pipe side. This works well for DN80 to DN400 fire mains. We have supplied F300 meters to high rise buildings in Hanoi, Jakarta, and Doha.
One project used a DN200 F300 on a diesel fire pump discharge header. The flow range was 40 to 400 cubic meters per hour. The building management system read the flow via 4-20 mA HART. The F300 totalizer recorded 12800 cubic meters during the annual test.
F300 Flow Meter Calibration Basics
A dry calibration applies a known differential pressure with a hand pump. A wet calibration runs water through the meter on a traceable flow rig. For fire systems, wet calibration is more useful. The velocity profile in a fire pipe is not uniform. The F300 has a correction factor for elbow and tee effects.
Here is the thing. Most engineers skip the velocity profile check. In a fire pump discharge line you often have an elbow within 5 diameters upstream. The default correction factor is 1.00. For that elbow you set 0.97 or 0.98. This changes the flow reading by 2 to 3 percent. The F300 stores this factor in the transmitter memory. You can set it from the local keypad or with a HART communicator.
Field Calibration Steps for Fire Protection Pipe
Start with the zero check. Close the isolation valve. Open the vent screw. Wait 30 seconds. Press the zero button. The display should show 0.00 bar. Next check the span. Apply 50 percent of the pressure range with a calibrated hand pump. For a 0 to 10 bar F300, apply 5.00 bar. The loop should read 12.00 mA. If the reading is off by more than 0.10 mA, adjust the span trim.
Release all pressure and verify 4.00 mA. Apply full pressure and verify 20.00 mA. Then check the flow reading with a HART communicator. The F300 should report a stable flow value. The damping is set to 2 seconds for fire water. This smooths diesel fire pump pulsation. The cut off is set to 0.3 percent of full scale. That prevents false totalizer counts when the pipe is full but no water moves.
Recommended Output Parameters for Fire Systems
Use the default square root extraction for pipes DN80 and larger. Use the 20 point linearization table only for small pipe. Set the temperature range to
Common Installation Mistakes on Fire Systems
Some contractors install the probe on the bottom of a horizontal pipe. Sludge and air pockets collect there. Install the probe on the side or top. The arrow on the probe body must face the flow direction. A reversed probe gives a negative flow reading. Another mistake is venting the impulse lines too fast. Open the vent valve until water comes out without bubbles. Then close it. This takes less than one minute.
How to Request a Quote for the F300 Flow Meter
Send us your pipe size DN, water pressure bar, water temperature in degrees Celsius, and required flow range in cubic meters per hour. Tell us the fire pump type, diesel or electric. We will reply with the F300 flow meter price, lead time, and a calibration data sheet. Tel: +86 25 68650347. WhatsApp: +86 25 52155837. WeChat: +86 15365082610.
Silver Instruments ships standard DN50 to DN150 F300 units from Nanjing in 7 to 10 working days. DN250 and DN300 units ship in 3 weeks. Each order includes the F300 probe, a 4-20 mA HART transmitter, a local display, and a 5 point calibration certificate.
FAQ: F300 Pitot Tube Flow Calibration for Fire Protection
What is the F300 flow meter accuracy after wet calibration?
After wet calibration on a traceable flow rig, the F300 accuracy is plus or minus 1.0 percent of reading above 20 percent of the flow range. Below that the accuracy is plus or minus 0.3 percent of full scale.
How often should you calibrate an F300 flow meter in a fire system?
Most fire protection codes accept an annual field verification. A full wet calibration every 2 years is common for diesel fire pump test loops. If the transmitter drifts by more than 0.15 percent of span, schedule a dry calibration.
Can the F300 be installed in a vertical fire riser pipe?
Yes. The F300 works in vertical pipe for upward or downward flow. Enter the pipe orientation in the transmitter menu. Select vertical up or vertical down. The velocity correction factor changes automatically.
What outputs does the F300 support for fire pump controllers?
The F300 supports a standard 4-20 mA loop with HART. It also has a pulse output for totalizer reading. Both outputs are isolated. The pulse width is 2 milliseconds. This works with most fire pump controllers in Southeast Asia and the Gulf region.
What is the lead time for an F300 flow meter with fire protection calibration?
Standard DN50 to DN150 units ship in 7 to 10 working days. Larger sizes or PN40 models may take 3 weeks. We can email a partial calibration report before shipment if your site audit needs the document early.
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