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Quick Answer: Turbine flow sensors with pulse frequency output are a practical choice for clean fuel fluids like diesel, jet fuel, and light oil. The output frequency is proportional to flow rate and works with PLC counters and batch controllers. For accurate fuel batching, specify fluid viscosity, flow range, pipe size in DN, and required signal type.
Silver Automation Instruments supplies turbine flow sensors for industrial fuel lines. A rotating rotor sits inside the flow path. Each blade passes a magnetic pickup. The pickup generates a pulse. Pulse frequency is linear with flow velocity. This signal connects easily to PLC high speed counters, batch controllers, and digital displays.
The standard output is a square wave pulse. Many models also offer a 4-20 mA HART output. But pulse output is the main reason turbine sensors work well for fuel dosing and totalization. A typical K-factor is 450 pulses per liter for a DN15 sensor. For a DN50 sensor it may be 75 pulses per liter. You calibrate the receiving device with this K-factor and get direct volume readings.
Fuel loading terminals use turbine sensors on loading arms. A customer in Vietnam installed 12 units on diesel loading skids last year. They needed stable pulse output over 40 meters of cable to a control room. Shielded cable and a 24 V DC supply worked without signal loss. The flow range was 20 to 200 liters per minute per arm.
Marine fuel transfer is another common application. A ship service company in Singapore uses turbine sensors for MGO and MDO transfer. They measure fuel from 10 to 80 centipoise viscosity. The pulse output connects to a batch controller with temperature compensation. In practice, most technicians handle this after one commissioning visit.
In Africa and the Middle East, generator set manufacturers use compact turbine sensors on fuel return lines. Return flow is often smaller than supply flow. You subtract return pulses from supply pulses. The result is actual engine consumption. This method is common in mining camps and telecom towers.
Start with viscosity. Turbine flow sensors work well in clean liquids from 0.5 to 100 centipoise. Diesel and jet fuel sit in the low range. Heavy fuel oil above 100 centipoise can slow the rotor and hurt linearity. Use a positive displacement meter or a Coriolis mass flow meter for that fluid.
Temperature and pressure matter. Most standard turbine sensors handle -20 to 120 °C and up to 40 bar. A fuel line near a heat exchanger may exceed that. Specify a higher temperature bearing option if needed. For diesel, stainless steel 316 body and tungsten carbide bearings are a practical combination.
Flow range is another key point. A DN15 sensor may cover 0.6 to 6 liters per minute. A DN40 sensor may cover 10 to 200 liters per minute. Do not oversize the meter. Standard turndown is about 10:1. You can push it to 20:1 with clean fuel and low pulsation.
Output frequency range often falls between 10 and 1000 Hz. This range is compatible with most PLC high speed counters. A very high frequency may require a dedicated counter card. Check your PLC input spec before ordering. One OEM in Mexico ordered sensors with a K-factor that produced 2000 Hz at maximum flow. Their standard input module maxed out at 1000 Hz. We swapped the pick-up coil to reduce the pulse rate.
Install the sensor with straight pipe upstream and downstream. A typical rule is 10 pipe diameters upstream and 5 diameters downstream. Avoid elbows, partially open valves, or strainers too close to the sensor. Swirl affects rotor speed and pulse accuracy. But a straight run is cheaper and easier than a flow conditioner.
Always install a strainer before the turbine meter. Fuel can carry rust, weld slag, and hose particles. The rotor blades are thin. Here is the thing. We have seen this on customer sites many times. A clogged strainer causes more service calls than a bad sensor. A 100 mesh strainer is common for clean fuels. Clean the strainer during shutdown.
Calibration is usually done with water or actual fuel at the factory. Silver Automation Instruments provides a calibration certificate with each turbine flow sensor. The certificate shows the K-factor in pulses per liter at several flow points. If you need field calibration, use a master meter or a weigh scale. Do not assume the printed K-factor works for all fluids. Viscosity and temperature change the pulse output slightly.
Some engineers prefer 4-20 mA HART because it gives a smooth analog signal and digital diagnostics. But for fuel batching and totalization, pulse output is more precise. Analog loops have resolution limits. Pulse counters count discrete volume pulses. The difference matters when you fill 5000 liter tanks and need repeatability of 0.1 percent.
Many users order both. They take the pulse output to a batch controller and the 4-20 mA HART output to a PLC or SCADA system. A food additive plant in Thailand does this on a solvent line. The pulse channel drives batching. The HART channel sends flow rate and total to the DCS. It works because the load requirements are not too high.
Send us these details before ordering. We need the fluid name and viscosity in cP. We need flow range in liters per minute or cubic meters per hour. We need pipe size in DN. We need operating temperature and pressure. We need signal type, whether pulse, 4-20 mA HART, or both. We need connection type, such as BSPP, NPT, flange, or tri-clamp. We also need power supply voltage and the receiving device brand and model if available.
This information helps us select the right K-factor and bearing material. It also helps us check if the pulse frequency matches your counter input. You can send these details by email or WhatsApp. Silver Automation Instruments contact details are below.
Tel: +86-25-68650347
WhatsApp: +86-25-52155837
WeChat: +86 15365082610
You can also visit flow-meter.com.au for more product categories. We supply 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. For fuel batching, the turbine flow sensor with pulse output is often the simplest and most cost effective option.
Can a turbine flow sensor measure diesel and gasoline?
Yes. Standard turbine flow sensors measure clean low viscosity fuels like diesel, gasoline, jet fuel, and light oil. Avoid liquids with particles or viscosity above 100 centipoise unless the sensor is designed for it.
What is the typical output frequency range?
Most models produce between 10 and 1000 Hz at normal flow. The exact range depends on meter size and K-factor. Check your PLC counter input before selecting a sensor.
Does the pulse output need a separate power supply?
Most pulse output circuits run on 5 to 24 V DC. A 24 V DC supply is common in industrial panels. The sensor needs external power for the magnetic pickup amplifier.
Can I use a turbine flow sensor for heavy fuel oil?
Heavy fuel oil with viscosity over 100 centipoise can reduce accuracy and damage the rotor. A positive displacement flow meter or Coriolis mass flow meter is a better choice for this fluid. We supply both options.
What straight pipe length is required?
Use 10 pipe diameters upstream and 5 diameters downstream as a standard rule. For small lines or high accuracy applications, increase to 15 or 20 diameters upstream. A strainer upstream also protects the rotor.
Need a quote for a turbine flow sensor? Send your fluid type, flow range in liters per minute, pipe size in DN, temperature in °C, pressure in bar, and signal preference. We reply with a model recommendation, K-factor estimate, price, and lead time from Silver Automation Instruments.
