Skip to main content

Select your region & language

Global

Region

Understanding flow measurement.

What is flow?

There are instantaneous flow and cumulative flow in flow measurement.

instantaneous flow rate

It refers to the volume or mass of fluid flowing per unit of time.
When the amount of fluid is expressed as volume, it is called the volume flow rate. In general, the term “flow rate” often refers to volume flow rate, and Japan’s Measurement Act also uses “flow rate” to mean volume flow rate. When expressed as mass, it is called the mass flow rate.

Cumulative Flow Rate

I will mention the cumulative value of the amount that has flowed from the start to the end of the measurement.
Even though we say "flow rate" in general, there are various types, and depending on the context and units before and after, if we do not clarify which flow rate we are talking about, the conversation may not align.

unit of instantaneous flow rate

  International System of Units (SI) Measurement Law
instantaneous volumetric flow rate [m3/s] [L/h] and [L/min] are also recognized.
instantaneous mass flow rate [kg/s] [kg/h], [g/min], and [g/s] are also accepted.

Unit of cumulative flow rate

  International System of Units (SI) Measurement Law
cumulative volume flow rate [m3] [L], [mm 3] are also accepted
cumulative mass flow rate [kg] [g] also acknowledges.

Since volume changes with pressure and temperature, it is necessary to specify measurement conditions such as temperature and pressure. When stating 'standard state' in the measurement conditions, it is essential to specify which standard's standard state is being referred to, as standard pressure and standard temperature differ by standard.

Flow measurement

We offer various detectors to accurately measure the fuel consumption of internal combustion engines. You can select the detector that suits your measurement scene.

How to select a detector

  1. Check the state and properties of the fluid to be measured
    such as flow range, fluid temperature, pressure, density at that time, viscosity, saturation vapor pressure, and corrosiveness, confirming the basic properties of the fluid at the state to be measured.

  2. Clearly define the purpose and determine the detection method
    Consider the required flow accuracy and resolution, whether you want to measure the cumulative value of a constant flow, whether you want to capture the changes in transient flow with high precision, whether you want to measure flow in hazardous areas, and whether you want to control the temperature and pressure of the fluid in addition to flow measurement, and decide on the detection method considering your desired measurement objectives and the entire system.

  3. Check the product specifications and narrow down the products to adopt
    2. From the products that match the detection method, narrow down the products that meet the requirements of 1. For detailed specifications, please contact our sales department.

Example of a flow measurement system study.

Items for consideration example Contents
Types of fuel Gasoline, diesel, alcohol mixed fuel, LPG (liquid), gas The FP series, FZ series, and FX series are designed for liquid measurement. For substances like LPG that become gas at room temperature and pressure, or liquid under pressure cooling, the system is designed to maintain a liquid state. Gas flow measurement can be done with the FZ series depending on conditions.
* calibration cannot be performed with gas. This is a report based on the results of the liquid test. Please be aware.
Required flow rate value (unit) Volume flow rate (L/h) The FP series allows for direct measurement of volumetric flow rate.
In the FZ series, volumetric flow rate can be converted from density data measured simultaneously.
mass flow rate (kg/h) In the FP series, it is possible to convert to mass flow rate in real time by combining the Fuel Density Meter FD-5110 and the FZ series.
In the FZ series, it is possible to measure mass flow rate directly.
In the FX series, it is possible to measure mass (weight) flow rate directly.
Flow range I want to measure in the range of 1.0 to 80 L/h. Select the detector based on the measurement range of each product.
transient measurement I want to graph the instantaneous flow rate with a sampling time of 10 ms. The FP series converts flow into pulse signals and determines the flow value by counting with the FM-3100. The FM-3100 is capable of 1 ms output (analog/CAN).
The FZ series outputs mass flow values from the FM-3100 every 100 ms. The FX series outputs weight flow values from the FM-3100 every 100 ms.
Primary fuel supply pressure 300 kPa The FP series can install detectors and measure flow normally if the primary fuel supply pressure is 100 kPa or more.
The FZ series has a pressure loss of the detector itself of about 100 kPa at 1090 kg/h. This takes into account the relationship with the secondary fuel supply pressure. *The primary fuel supply pressure refers to the pressure at the fuel supply port of the building in the case of an engine bench.
Secondary fuel supply pressure 350 kPa In this case, since the secondary supply pressure is higher than the primary supply pressure, it is necessary to boost it with a pump or similar device.
An assembly is required, including a fuel flow detector. Please consult us. *The secondary fuel supply pressure refers to the supply pressure to the engine in the case of an engine bench.
temperature control Do not want / Necessary If temperature control is necessary, such as keeping the fuel supply temperature constant, an assembly is required. Please consult us.

connection diagram

  • connection diagram

lineup

Volumetric Flow Detector
  standard type low pressure loss type explosion-proof type Compact and environmental resistance
Enhanced type
pressure-resistant explosion-proof internal pressure explosion-proof
small flow type FP-5130 Series FP-213S FP-3130 series FP-3130S series FP-4135
Medium flow type FP-5140 Series FP-2140S FP-3140 Series -
large flow type FP-5150 Series - FP-3150 series -
Fuel Density Meter
standard type FD-5110
Coriolis continuous mass flow meter
small flow type made-to-order
Medium flow type FZ-2200A
mass burette flow meter
small flow type FX-1110
Medium flow type FX-1120
large flow type FX-1130

Principle of Measurement