General Description
Sokken Flow Measurement or goes by full name Tsukasa Sokken Co., Ltd. is a company headquartered in Setagaya city, Tokyo, Japan. Founded on 1964, they also established a branch located in Utsunomiya, Togichi, Japan on 2005.
Sokken beginning to produce and sell in-cylinder Gas Sampling System for IC engines, then as the time goes by, they widening their range product into Smoke Meter, Air Fuel Ratio Meter, Diesel Opacimeter, and the others
Sokken have particular strength in measuring flow/pressure measurement technology, thus Sokken has been very much contributed to R&D’s for automotive technology by providing the test and measuring instruments.
he laminar air flow meters and sonic nozzles are the core products for Sokken’s flow measurement technology and both products are highly reliable and are introduced in textbooks those of fluid dynamics. These products are the typical flow meters basically based on the fundamental physical laws. Meanwhile, the pressure gauges are not only one of the commercial products but also devices incorporating into Sokken’s custom-made products and are the indispensable products to develop our new instruments.
Applications
- Intake air and exhaust gas flow measurement for IC engines
- Flow testing for blowers and pumps
- Evaluations for fluid control parts
- Standard air flow generator cofigured by sonic nozzles
Sokken Flow Measurement Product
LFE series Laminar Flowmeter
Laminar flowmeter is a flowmeter with linear relationship between the volumetric air flow rate and its differential pressure. The differential pressure in rated flow rate is quite low so it doesn’t affect the characteristics for any test parts.
Also the combination of LFEs and LFC-300 does produce no square root errors under the pulsation flow like orifices or round nozzles because of its linear pressure drop characteristics.
Line Up
- B series, Total 11 models from 10 to 500 Litre/sec.
- LM series, Total 9 models from 27 to 1,000 Litre/min.
Surge tube ST-300
- Attenuate pulsating flow
- Equivalent to 300 litre volume with 3 litre rubber/metal vessel
Options
- with air filter and duct
- with upstream/downstream ducts
- with flexible duct
Features
Low pressure drop and high accuracy in flow rate
- Approx 0.8kPa in pressure drop with rated flow
- Accuracy in +/-1%FS within the rated flow
- Accuracy in +/-1.5%FS over 150% rated flow
Excellent response time
By assuming pay attention to occur no columnar vibration in the pressure leads with fast response pressure transducer then the 95% amplitude ratio response time can be derived with the pulsating frequency in 150Hz.
Accurate flow measurement can be made under pulsating flow
The average of the pressure drop fluctuation corresponds to the average of air flow rate since the relationship between volumetric air flow rate and pressure drop is linear.
Applications
Optimal flowmeter for engine intake air measurement
- Less errors under pulsating flow
- Except the low engine speed or single cylinder engines air flow can be measured without surge tank
- Doesn’t affect the engine performance with its low pressure dropCan be covered the whole engine conditions with its wide dynamic flow range
Specifications
| Rated flow rate | Refer to the table in “How to express the model number?” |
| Pressure drop | Approx. less than 0.8kPa at the rated flow |
| Linearity of the pressure drop for flow rate | within +/-1%FS in rated flow and +/-1.5%FS in over 150% rated flow rate |
| Accuracy for the laminar coefficient | within +/-1%FS |
| Allowable line pressure | less than 30kPa |
| Response time | approx. 150Hz (Refer the graph in features) |
| Allowable temperature range | 5 to 50C (without water condensation) |
Note:
An additional differential pressure gauge and a temperature sensor are required to measure the volumetric flow rate.
An additional differential pressure gauge, a temperature sensor and an absolute pressure gauge are required to measure mass flow rate.
Sokken recommend using a laminar flow calculator LFC-300 which equips a differential pressure gauge, a temperature sensor and an absolute pressure gauge.
Laminar Flow Calculator LFC-300
Model LFC-300 is a dedicated air flow calculator for Sokken’s LFE series of laminar flowmeters. Either the volumetric/Mass flow rate can be measured by only to connect to a laminar flowmeter.
]The accuracy of flow rates in +/-1%FS are achieved by using pressure transducers with high accuracy and long term stability.
Features
- can be applied for whole models of LFE series laminar flowmeter
- can be measured the instantaneous or integrated volumetric or mass air flow rate, and differential/absolute pressure and temperature.
- equipped with 2 channels of analogue outputs and 8 general purpose input/output ports
- equipped with interface of USB, RS-232C and Ethernet
Guarantee the accuracy of air flow rate
It is not so easy to confirm the accuracy of air flow rate in case of LFE series to be combined with pressure transducers and temperature sensor even if the calculation of air flow is relatively easy.
Output the volumetric/mass air flow rate with easy connection
The connections have to be made with two tubes between LFC-300 and a laminar flowmeter and fit a temperature sensor into upstream of the flowmeter. Then preset the laminar flow coefficient onto the touch panel screen. The LFC-300 can display/output by calculating the real volumetric air flow rate (volumetric air passing through the laminar flowmeter), converted standard air flow rate (under 20C 1atm) and mass flow rate.
Covering wide ranges from 10mL/min to 500L/s
Applicable for whole models of LFE series
Model LFE-300 can be applied for whole models of laminar flowmeters so it can be applying the different type of laminar flowmeters.
Strictly selected pressure sensor and temperature sensor
Model LFC-300 can be utilized the wide single range of laminar flowmeter with keeping high accuracy even in low flow rate (say low pressure drop) by employing the excellent pressure sensor with high accuracy and long term stability. A sheath type of fine thermocouple easy to use with 1mm diameter can respond quickly to the temperature change.
Display and Output
- Freely selectable unit for flow rate
- Model LFC-300 can be set the flow unit arbitrarily regardless the laminar flowmeter used, so the optimum result with the best flow unit can be displayed. The decimal point position is automatically set based on the laminar coefficient so the number of display digits can effectively be utilized.
- Better user-friendliness with touch panel and switches
- Several improvements were made in order to get the information by pressing the hard switches for “Display Alarms/Errors, Hold result, Adjusting Zero and Start/Stop Cumulative Flow” etc. Also releasing the differential pressure sensor to atmosphere function was added without removing the pressure leads
- 2 channels of analogue output
- The temperature and pressure (dP and abs.) are also displayed/output simultaneously with air flow rate. The analogue output has first order lag filter. Scaling the analogue output and setting the time constant of lag filter can be set arbitrarily.
- Three types of interface as standard equipment
- The best communication method can be selected within USB, RS-232C or Ethernet. It is possible to get data (air flow rate, pressure and temperature) and also to change the settings.
- General purpose Input and Output (DIO) as standard equipment (4 channels each)
- These DIOs can be utilized for automated selector of laminar flowmeter and protecting the external equipment linked with errors and alarms. .
Separate type display
The separate type display is an another cabinet with touch panel, switches and analogue output from main cabinet and it can control the main cabinet which is installed near the measuring point and is better to control the main cabinet from far away. The cabinets are connected with 15m and 7mm diameter oil resistant cable.
The analogue output connectors and four switches for “STATUS, HOLD, ZERO and TOTAL” are fitted on this cabinet.
Applications
- Intake/delivery air flow measurement for engines.
- Flow tests and development for engine control devices.
- Air flow measurement for vacuum pumps, compressors and blowers with pulsation flow.
Sokken VAV-EGF6 Raw Exhaust Gas Flowmeter
Sokken has a variety range of product, such as:
- Air Flow meters: air flow meters provided by Sokken are based on laminar flow meter and sonic nozzle, and can be used in many fields
- Pressure Gauges: Pressure Gauges provided by Sokken have a wide products range with several type of pressure gauges.
- Particle Measurement Systems: Particle Sizer and Counter provided by Sokken measure particle size distribution and number counting in real-time for nano particles
- Gas Analyzers: Fast Gas Analyzers provided by Sokken bring you hints for engine modifications to reduce exhaust emissions and fuel economy
- Smoke Meters: Several kind of Smoke meters provided by Sokken support vehicle inspection and engine research laboratory.
- Custom-made Instruments
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