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Micro Thermal Gas Mass Flow Meter
The basic principle of the intelligent vortex flowmeter is the Kármán vortex street principle, which states that “the vortex shedding frequency is proportional to the flow velocity.” The diameter of the flowmeter’s main body is essentially the same as the instrument’s nominal diameter. An approximately isosceles triangular prism is inserted into the flow body, with its axis perpendicular to the direction of the measured medium’s flow, and its base facing the fluid.
When the measured medium flows past the prism, vortices are alternately generated on both sides of the prism. These vortices are continuously generated and shed, forming two staggered rows of vortices downstream of the prism, known as the “vortex street.” Theoretical analysis and experiments have proven that the vortex shedding frequency is directly proportional to the fluid velocity on the sides of the prism.
Product Advantages
Product Introduction
Main technical parameters
Nominal diameter ( mm ) | DN 8 | DN 10 | DN 15 | DN 20 | DN 25 | ||
Flow rate range (L/ Min ) | / | / | 3-100 | 5-150 | 5-150 | ||
Critical flow rate (L/ min ) | / | / | 5 | 8 | 10 | ||
Measuring medium and temperature | Liquid; ≤80℃ | ||||||
Pressure level | 1.6 MPa | ||||||
Material | Valve body: 304 stainless steel; Sensor: PPS; Display housing: Aluminum | ||||||
Accuracy | ± 1.5% | ±2.0% | ±3.0% | ||||
Range ratio | 10 :1 | 20 :1 | 30 :1 | ||||
Power supply | 12-24 VDC | ||||||
Output | 4-20 mA & RS485 | ||||||
Protection level | IP65 | ||||||
Environmental conditions | -20~55℃; Relative humidity: 5~95%; Atmospheric pressure: 86~106 Kpa | ||||||
Display | LCD Display | ||||||
Electrical interface | 5-pin aviation connector | ||||||
Connection method | G1/4 | G3/8 | G1/2 | G3/4 | G1 | ||
Total length ( mm ) | 100 | ||||||
Total height ( mm ) | 85/45 | ||||||
Wiring | Brown: 24V+；Blue: 24V-；Gray : 4~20 mA +；White: A；Black: B | ||||||
Converter Parameter Description
Instantaneous flow parameters
Flow Unit | Options: L/s L/m L/h m³/s m³/m m³/h Nm³/h USG/s USG/m USG/h Kg/s Kg/m Kg/h t/s t/m t/h Default value: m³/h Defines the units of instantaneous flow rate L (liters), h (hours), t (tons), s (seconds), m (minutes) |
Total Number of Decimal Places | Options: 0 1 2 3, Default: 1 Defines the number of decimal places for instantaneous flow rate. |
Range | Floating-point number: 99999999.00 – 0.00 m³/h，Default value: 100.0 m3/h When the instantaneous flow rate reaches the range, the converter outputs 20 mA . Changing this parameter will affect the current output, high alarm, and low alarm. Notice：When you modify this setting (range), please note the unit of this parameter (range). You can modify the unit of this parameter (range) as needed. |
Small Signal Resection | Floating-point number: 9.90 ~ 0.00%，Default value: 0.0% This setting is a percentage of the measurement range. |
Damping Time | Floating-point numbers: 30.0 ~ 0.1，Default value: 1 |
Total parameters :
Total Unit | Options: L ( liter ) m³ Nm 3 USG Kg t ( ton ) , Default value：m³ Define the total quantity unit |
Total Number of Decimal Places | Options: 0 1 2 3 ，Default value : 1 Define the number of decimal places in the total amount. |
Preset total | Options: 99999999.00-0.00 m3/h ，Default value : 0.0 m3/h Clear total or set total value |
Instrument calibration:
Current Zero-Point Calibration | After entering this submenu, use a multimeter to measure the current output value. If the current value is not equal to 4.0mA, enter the actual value measured by the multimeter, and the converter will automatically complete the 4mA current output calibration standard value. If the current output deviation is too large, multiple corrections are required to verify the requirements. The maximum input value for each correction is 5.0mA. |
Full-Scale Current Calibration | Floating-point: 21.0 ~ 19.0, Default: 0.0 After entering this submenu, use a multimeter to measure the current output value. If the current value is not equal to 20.0mA, enter the actual value measured by the multimeter, and the converter will automatically complete the 20mA current output calibration. If the current output deviation is too large, multiple corrections are required to verify the requirements. The maximum input value for each correction is 21.0. |
Output settings: Configure parameters for three output modes: equivalent output, frequency output, and signal output.
Frequency Limit | Floating-point numbers: 5000.0 – 100.0 Hz ，Default value: 2000.0 Output frequency ( Hz ) = Instantaneous flow rate (m³/h) ÷ Measuring range (m3/h) × Upper frequency limit ( Hz ) For example: if the instantaneous flow rate is 100 m³/h, the range is 200 m³/h, and the upper frequency limit is set to 2000 Hz, then the output frequency corresponding to the instantaneous flow rate of 100 m³/h is 1000 Hz. |
Pulse Equivalent | Floating-point number: 9999.0 – 0.0 ，Default value: 0.0 The unit of pulse equivalent is L (liters)/pulse. Users can change the unit of pulse equivalent to: USG /P, Kg /P, t/P as needed. Nm3/P, m3/P |
Pulse Width h ( ms ) | Floating-point numbers: 1000.0 ~ 0.0 ms ，Default value: 0.0 When the pulse width is set to “0”, the pulse duty cycle is 1:1. |
Signal Output | Original signal output Note: 1. Only frequency output and equivalent output are distinguished. 2. Nonlinear correction also applies to the original signal output. 3. It is related to the instrument coefficient K. F(HZ)=3600/(Q*K) Q: Instantaneous flow rate (m³/h); K: Instrument coefficient |
FAQ
We provide you with the advantages of a reliable manufacturer.
Are you the source factory?
Yes. We are a professional manufacturer of flow meters and Industrial instrument, production, sales, and service. With excellent processing equipment and advanced technology, we have received multiple honors and customer praise.
What can you buy from us?
We have products like oval gear flow meter, turbine flow meter, electromagnetic flow meter, vortex flow meter, mass flow meter, ultrasonic flow meter, radar level meter, precession vortex flow meter, etc.
How long is the warranty period?
Standard one year warranty, and lifetime technical support is provided for all our client.
How can we guarantee quality?
All the flow meter and sensor have passed the national quality inspection and obtained ISO certification for quality management system certification, CE certificate, high-tech enterprise certificate, calibration certificate and all the products will be verified as qualified before shipment.
After I paid,how long will the delivery take?
Standard: 1-2 working days shipment
Custom models or in bulk: negotiate the specific time
Can you provide installation videos or manuals for us?
Sure thing, we’ll provide English manual and tutorials for you. For all our client, And our technical engineers are always at your service！