Thermal Throttle Type Analog Gas Mass Flow Controller and Mass Flow Meter

Product Description

 Mass Flow Meter (MFM) accurately measures mass flow rates, Mass Flow Controller (MFC) accurately measures and controls mass flow rates despites gas volume fluctuated due to pressure or temperature changes. They are widely applied in the fields as: semiconductor and IC fabrication, special materials science, chemical industry, petrolic industry, pharmaceutical industry, environmental protecting and vacuum system researching, etc. The typical applications include: microelectronic process equipment such as diffusion, oxidation, epitaxy, CVD, plasma etching, sputtering, ion implantation; vacuum deposition equipment, optical fiber melting, micro-reaction equipment, mixing & matching gas system, capillary flow control system, gas chromatograph and other analytical instruments.

Mass flow controller (MFC) and mass flow meter (MFM) belong to an industrial automation instrument. MD-05 Series MFC/MFM are analog range. MD-05 series MFM & MFC bring the high accuracy, excellent repeatability, quick response, soft-start, better reliability, wide variety ranges of operation pressure (good operation in high pressure and vacuum situations), simple convenient operation, flexible installation, possible connecting with PC to carry out automatic control to the users' system.

Application

MD-05 calorimetric mass flow meter, mass flow controller can be applied to the measurement and control of various gases, in addition to measurement can also accurately control the mass flow of gas, mass flow meter (MFM) can accurately measure the mass flow of gas.

Widely used in electronic processing equipment, semiconductors, vacuum coating, solar energy, optoelectronics, petrochemicals, metallurgy, medical and pharmaceutical, aviation power, optical fiber melting, analysis and measurement equipment, gas distribution and other industries.

Features

1, large flow type;

2, rubber seal;

3, international standard mechanical connector.

Technical Parameters

Notes :

MFC/MFM is calibrated by N2 as a standard gas.

Units:                            SCCM  (Standard Cubic Centimeter/Min);

                                     SLM    (Standard Liter/Min)

Standard Situation:      Tem - 273.15K ( 0 ºC );

Air Pressure -               101325 Pa  (760mm Hg)

F.S :                              Full Scale

 

Structure

 The MFM consists of flow sensor, flow-splitter bypass and flow amplifying circuit. If add Control valves and PID control circuit to MFM will compose a MFC. The following figures (Figure 2) are exactly showing the structures of MD-05-60B MFC after opening up their overall:

 

Operation Principle

According to the Capillary Heat Transfer Temperature Difference Calorimetry Theory, the flow sensor measures the mass flow without pressure compensation. The sensor heated the flow signal which was measured by electric bridge and amplified it through amplifier, the amplified flow testing voltage is compared with presetting voltage, the differential signal will control valve after amplified, then the flow rate of closed loop control will be as same as presetting flow rate. The bypass divider controls the flow rate. 

The outputting flow testing signal from MFC is a direct ratio with the flow through the channels, flow outputting signal is 4~20mA (or 1~5VDC). The Flow control ranges of MFC is (2~100)% F.S.. When the set point <2% F.S. the valve will shut off. MFC and MFM flow resolving power is 0.1% F.S..

If you need more further details about our products,  please feel free to contact us .

 

 

 

 

 

A Split Hopper Barge (SHB) is a vessel with a large open hold, used to load and transport dredged material. The Barge is loaded by a Cutter Suction Dredger or by a Backhoe Dredger. The barge is self-propelled, and sails to the deposit area, where it unloads the soil. The vessel consists of two halves, and unloading is done by opening, or `splitting`, the two halves, and depositing the soil on the seabed.

A hopper barge is a kind of non-mechanical ship or vessel that cannot move around by itself, unlike some other types of barges, that is designed to carry materials, like rocks, sand, soil and rubbish, for dumping into the ocean, a river or lake for land reclamation.Hopper barges are seen in two distinctive types; raked hopper or box hopper barges. The raked hopper barges move faster than the box hoppers; they are both designed for movement of dry bulky commodities.

Photo of our Split Hopper Barge:

There are several "hoppers" or compartments between the fore and aft bulkhead of the barge. On the bottom of the barge hull, there is (are) also a large "hopper door(s)", opening downwards. The doors are closed while the vessel is moving, so she can carry the materials that are to be dumped. The door(s) open when the ship has arrived at the spot where the materials are to be dumped.

Split barges serve the same purpose, but instead of a door in the hull's bottom, the hull of the whole barge splits longitudinally between the end bulkheads. The vessel consists of two major parts (port and starboard halves), both are mostly symmetrical in design. Both parts of the vessel are hinged at the deck and operated by hydraulic cylinders. When the vessel splits the load is dumped rapidly, which means the barge has to be very stable in order not to capsize or otherwise get damaged.

Split Hopper Barge

Self Propelled Barge,Floating Barge,Tug And Barge,Jack Up Barge

Unisite Group Ltd. , http://www.unisitemarine.com