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Posts Tagged ‘mass flow meters’

Flow Totalization in Gas Usage Monitoring

October 31st, 2016 No comments

A common application where accurate flow totalization is required is gas usage monitoring. In this application there is typically a single source of gas being shared by several different users or locations within a facility. To account for usage, or allocate costs properly, the facility needs to monitor the amount of gas consumed by each user.

Typical Installation

A typical installation for this application includes several flow meters, secondary electronics with totalizer function cabling from each device connected to a central monitoring system. The totalizer gets a flow signal from the flow meter, calculates the totalized flow and sends that value to the central monitoring system.

Gas Usage Monitoring Diagram

Typical gas usage monitoring installation

With this approach the accuracy of the totalized flow may not be optimized. There may be some additional error due to resolution of the analog to digital converters (ADC) and signal noise. The user also needs to be sure the analog signals were calibrated properly and that they match the span and time units of the flow meters. Signal filtering, signal cutoffs, sample rates and sample period can also have an impact. All of these factors could lead to improper billing or cost allocation. There is also additional hardware and cabling costs with this approach that could be avoided.

A Lower Cost Approach

An alternate approach uses digital mass flow meters, like the Brooks SLA Series, which calculate the totalized flow value internally. With this approach, no additional inaccuracy is introduced with a secondary calculation or digital to analog conversion.

Gas Usage Monitoring Diagram Using Brooks SLA Series MFCs

Gas usage monitoring installation using Brooks SLA Series Mass Flow Meters

 

 

 

 

 

 

 

 

 

Another advantage of this approach is that the user is able feed the totalized flow value directly to the gas monitoring system via digital communication. This eliminates the need for the totalizers and simplifies the wiring, therefore reducing the total installed cost of the system.

Validating Totalized Flow Accuracy

To confirm the totalized flow accuracy of the SLA Series mass flow meters, Brooks Instrument used a Bell-Prover (traceable flow calibration standard) and a formal totalizer verification process. With this approach we were able to demonstrate totalized flow accuracies of better than 1.2%. The chart below summarizes the data for 12 devices each run at four (4) flow rates.

Brooks Mass Flow Meter Error Rate Date

 

 

 

 

 

 

Brooks Instrument SLA Series mass flow devices are available with a variety of digital communication protocols and a range of options to satisfy even the most difficult applications including hazardous area and outdoor installations.

To learn more about our proven mass flow devices for gas usage monitoring or any other application where totalized flow is required, please contact us.

Quantim Coriolis Mass Flow Controllers in Space

December 28th, 2011 Comments off

After posting the blog about Brooks’ history with NASA this morning, I realized that this blog post about our Quantim’s in space must have been mistakenly deleted at some point, so here it is! Enjoy!

Delivering saline solution to a clinic for medical needs … sounds simple enough, right? Not when that clinic is on the International Space Station, the moon or even Mars. Transporting medical fluids that are manufactured on Earth into space is expensive and logistically challenging. NASA Johnson Space Center knew there had to be a way to manufacture medical fluids in space to alleviate the transportation problems and to make spacecraft more self sufficient, so they called on the microgravity science expertise and spaceflight hardware development know-how of Cleveland, OH based NASA Glenn Research Center and ZIN Technologies, Inc.

Coriolis Mass Flow Controller in IVGEN Read more…

Australian Research Institute Deploys Brooks Gas Mixing Solution

December 20th, 2011 Comments off

We always like to take the opportunity to share our customer success stories. Here’s one from the land Down Under where Brooks worked with Measurement Plus Pty. Ltd. to install a new gas mixing system at a research institute in Melbourne.

Researchers at the institute were using N2, CO, CO2 and Ar to stabilize a reaction chamber. However, at some point during the process, they wanted the ability to flow in a mixture of these gases. At the time, the institute was using older Brooks thermal mass flow meters inside a self-designed panel. The panel and its components were about 30 years old, rusted and looked like a bird’s nest. Read more…

Talking Flow Meters and More at the Chem Show

November 2nd, 2011 1 comment

Yesterday, during the Chem Show in New York City, our very own Steve Kannengieszer was interviewed by Chemical Processing magazine‘s Senior Digital Editor, Traci Purdum. We’re still waiting for the video but I thought I would share some of the Q&A’s that were covered. If you are at the Chem Show, stop by and see us at booth 303! Read more…

Fuel Cell Seminar 2011

October 28th, 2011 Comments off

During the same exact week that we’ll be at the Chem Show, we’ll also being exhibiting at the Fuel Cell Seminar, dividing and conquering! You’ll see our industry experts Jan Christensen and Nigel Glover hanging out and ready to talk flowmeters with you at our booth, which is booth #412.

We have a lot of great new products to showcase at this years Fuel Cell Seminar like the SLA5800 Series digital thermal mass flow controllers and mass flow meters. The SLA5800 Series elastomer sealed digital thermal mass flow meters and mass flow controllers offer unparalleled flexibility and performance for the fuel cell industry. They offer faster response, better accuracy and improved control over traditional analog devices. Industry leading repeatability ensures a stable process even under changing conditions. The devices’ self diagnostics and alarms eliminate downtime. These devices have a proven track record in many fuel cell test stands, so stop by and ask Nigel or Jan about them. Read more…