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Fuji Ultrasonic Flow Meter Sizing: Precise Transit-Time Liquid Management for Chilled Water Lines
Quick Answer: Fuji transit-time ultrasonic flow meters handle clean chilled water from DN25 to DN6000. Size the meter by pipe diameter, wall thickness, flow range, temperature, and pipe material. A target velocity of 0.5 to 3 m/s keeps measurement stable, and for DN200 pipe that usually means 55 to 340 m3/h.
Why Transit-Time Works for Chilled Water
Chilled water lines usually operate at 1 to 6 °C and carry clean water or water with glycol. The liquid has no particles and no gas bubbles in a closed loop. Fuji transit-time meters send ultrasonic signals between two sensors. The signal travels faster downstream and slower upstream. The meter calculates flow velocity from this time difference. Because the fluid is clean and the pipe is full, the signal stays strong.
Do not use transit-time if the line has heavy air entrainment, sludge, or solids. For dirty water, a magnetic flow meter works better. Most data center and district cooling loops are not dirty, so Fuji transit-time is a practical fit.
Sizing Data You Must Confirm
Send these details to Silver Instruments for a firm Fuji meter quote. Pipe size DN, pipe material, outside diameter, wall thickness, flow range in m3/h, fluid type, glycol percentage, temperature in °C, pressure in bar, and signal output. Missing wall thickness causes delays on clamp-on jobs. A 2 mm wall error shifts the sensor spacing and reduces accuracy.
Here is the thing. Many engineers only send pipe size and flow range. That is enough for a rough budget, but not for final sensor selection. We need the pipe material and wall thickness because stainless steel and carbon steel have different sound speeds.
Flow Range and Velocity Rules
For chilled water, keep velocity between 0.5 m/s and 3 m/s. Below 0.3 m/s, transit-time accuracy drops because the time difference becomes very small. Above 5 m/s, vibration, noise, and sensor misalignment cause drift. Use these typical ranges to check your line.
For DN100 pipe, the practical range is about 15 to 85 m3/h. For DN150 pipe, expect 65 to 190 m3/h. For DN200 pipe, expect 55 to 340 m3/h if the velocity stays inside the normal band. A chilled water line in a Vietnam electronics plant ran at 0.9 m/s on DN150 pipe and the Fuji meter held stable readings at 63 m3/h.
For DN15 to DN25 lines, clamp-on transducer spacing becomes too short. Use an inline Fuji transit-time meter or a small magnetic flow meter. For DN32 and above, clamp-on sensors are easier to install without cutting pipe.
Installation and Sensor Selection
Chilled water pipes are often insulated. The installer must remove insulation at the sensor location and clean the surface. Fuji clamp-on sensors need straight pipe upstream and downstream. Use 10 diameters upstream and 5 diameters downstream from elbows or valves. If the p
Do not mount sensors on the top of a horizontal pipe if air pockets can collect. Side mounting at 3 o clock and 9 o clock works well. For permanent chilled water monitoring, Silver Instruments supplies Fuji Electric fixed transit-time meters with 4-20 mA HART, pulse, and RS485 Modbus output. The FSV series is common in Asia Pacific for this service. For temporary flow checks, a portable Fuji transit-time meter with clamp-on sensors avoids pipe work.
Energy Monitoring Option
If the chilled water line needs BTU or ton-hour measurement, pair the Fuji flow meter with two PT100 temperature sensors and an energy calculator. The flow meter sends flow rate to the calculator. The calculator uses supply and return temperature difference to compute energy in kWh or MJ. In a Singapore district cooling plant, flow range was 0 to 500 m3/h on DN300 pipe, and the customer used 4-20 mA HART to feed the BMS. Pressure was 8 bar and water temperature was 5 °C.
Common Questions From Plant Engineers
Q: Can Fuji transit-time meters measure chilled water with 30 percent glycol?
A: Yes. Transit-time meters work with clean glycol water up to about 40 percent glycol. Tell Silver Instruments the glycol percentage so the meter uses the correct sound speed.
Q: What is the minimum conductivity required for Fuji transit-time meters?
A: None. Transit-time meters do not need conductivity. This is why they work well on chilled water loops that often have low conductivity. Magnetic flow meters have stricter conductivity limits.
Q: Should I use clamp-on or inline sensors for a chilled water line?
A: For DN15 to DN25 lines, use inline sensors. For DN32 and above with clean pipe and straight run, clamp-on sensors can save shutdown time. The final choice depends on pipe material, wall thickness, and access space.
Q: What accuracy can I expect on a chilled water line?
A: Typical accuracy is 1 percent of rate or better when installed with proper straight run and clean pipe. Repeatability is around 0.2 percent. Bubbles, scale, or weak signal will reduce accuracy.
Q: How fast can Silver Instruments quote a Fuji flow meter?
A: If you send pipe size DN, wall thickness, flow range, fluid, temperature, pressure, and output signal, we return a model code and price within 24 hours. Missing pipe wall thickness is the most common delay.
Send Process Data for a Firm Quote
Do not send a basic request like flow meter price. Send your pressure in bar, temperature in °C, pipe size DN, flow range in m3/h, and pipe material. Silver Instruments will use these details to size the Fuji transit-time meter and choose the correct sensors. Tel: +86-25-68650347. Whatsapp: +86-25-52155837. WeChat: +86 15365082610.
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