Repeatable, Repeatable...

M+W Instruments™ for Sub Atmospheric Applications

M+W Instruments™ offers digital MASS-STREAM™ D-6300 mass flow meters and integrated flow controllers for gases with flow rates from 0.2 up to 5000 ln/min Air equivalent.

The CTA inline measurement principle incorporates effectively an open pipe allowing mass flow measurement and control also with pressure ratings below 1 bar (a).
 

For Applications with the following requirements

the MASS-STREAM™ is an excellent choice:

• P1 > approx. 300 mbar (a)
• Integrated valve control, even with need for valve function "Fails In Place" in case of a power failure
• Gas flow suction through the instrument may be generated with a pump

M+W Instruments™ offer these popular optional features:

• Up to 8 calibrated flow curves in one instrument
• Multifunctional display which can show:

           Actual flow [unit]

           Totalizer

           Setpoint via display

           Alarm

• Additional digital interfaces
• Degreased instruments for O2 applications

To learn more call us at 610-866-6750

or email us at

sales@bronkhorstusa.com

Don't Take Our Word

What Others Say About M+W Instruments™

"Since our decision using the reliable MASS-STREAM™ D-6300 mass flow controllers in our Ammonia lines we could significantly stretch our service periods."

(Surface Treatment)

"It is amazing that these inline instruments ran for more than 6 years despite our polluted gases. We had no idea what really happened in our gas lines and now understand our signal offset below 25% flow rate. A high-quality robust instrument - I am really satisfied."

(Gas Consumption)

"Getting all data on the central control panel is OK, but I have to move through our large plant. I therefore like the user-friendly integrated display very much and can check all relevant process parameters during my inspection tour."

(Metal Processing)

Learn more about M+W Instruments™ here. 

Good to Know

 

Thermal mass flow instruments use temperature, as their name suggests, in calculating mass flow. There are, however, several ways to use temperature to calculate mass flow.

 

Thermal mass flow instruments that use a bypass (capillary bypass, bypass sensor) are what most people have in mind when they think of thermal mass flow instruments. In these instruments power is applied to heat the sensor tube and then the temperature of the tube is measured at two points.

With no flow the temperature differential between the two points will be zero. As flow increases the temperature at the first measuring point will decrease as fluid carries away heat, and the temperature at the second measuring point will increase as the fluid carries heat to it. More flow results in a greater temperature differential. The temperature differential is used to calculate mass flow.

Another technology used to measure mass flow is CTA (Constant Temperature Anemometer). In a CTA (through flow, straight tube) instrument there are two measurement "pins" inserted in to a straight tube flow path.

The first "pin" both heats and measures the temperature of the fluid, and the second "pin" measures the temperature of the fluid. Again, as gas flow increases the gas will carry heat from the first measuring point to the second. In a CTA, however, the power is varied to keep the temperature between the two measuring points constant, and it is this power level that is used to calculate mass flow.

Each technology has its advantages and disadvantages which generally are application specific.

A clean, dry gas application where accuracy is as important
 as repeatability may be a better application for a bypass instrument like the Bronkhorst EL-FLOW.

An application with a dirty or slightly moist gas, or where lower accuracy but high repeatability and robustness is required may be a better application for a CTA instrument like the M+W Instruments™ D-6300 MASS-STREAM™.
 

Laws and Guidelines

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