Agilent Community
Agilent Community
  • User
  • Site
  • Search the Community
  • User
  • Home
  • Technical Areas
    Technical Areas
    • AssayMap
    • Atomic Spectroscopy
    • Automated Electrophoresis
    • Bioreagents
    • Cell Analysis
    • Consumables
    • CrossLab Connect
      CrossLab Connect
      • Service Management
      • Smart Alerts
    • Dissolution
    • Gas Chromatography
    • GC/MS
    • LC/MS
    • Liquid Chromatography
    • Molecular Spectroscopy
    • Sample Preparation
    • Software
      Software
      • Chromatography Software
        OpenLab CDS, OpenLab ChemStation, OpenLab EZChrom
      • Data Management Software
        OpenLab ECM, OpenLab ECM XT, OpenLab Server
      • Mass Spectrometry Software
        Data Analysis, Data Acquisition, Productivity App, WalkUp Software
    • Vacuum
  • Applications Areas
    Applications Areas
    • Basic Research
    • Energy and Chemicals
    • Environmental
    • Food and Agriculture
  • Agilent Knowledge Portal
  • Links
    Links
    • Collection of Support Resources
    • Webinar Notifications
    • Contact Support
    • User Contributions
  • Getting Started
    Community Help and Resources
  • Browse
    Browse
    • People
    • Places
    • Your View
    • Your Community Inbox
Consumables
  • Technical Areas
Consumables
Wiki Achieve accurate and repeatable gas flow meter measurements
  • Announcements
  • Forum
  • Files
  • Wiki
  • More
  • Cancel
Actions
  • Share
  • More
  • Cancel
Table of Contents
  • Consumables
  • A Beginner’s Guide to Hydrophobic Interaction Chromatography
  • A simple tip to protect your columns
  • A Tip for Preparing Robust and Consistent Mobile Phases
  • Achieve accurate and repeatable gas flow meter measurements
  • AdvanceBio Columns Blog Series
  • Agilent 123 Meter Sodium probe maintenance
  • Agilent Collection of Columns, Supplies, and Standards Resources
  • Analysis of microplastics in the environment
  • Analyzing ADCs by HIC
  • Avoiding downtime in the lab: top tips for GC/MS success
  • Best Practices for Aqueous Mobile Phases
  • Best Practices for Making Good Connections
  • Bio LC Column User Guides
  • Bursting Tubing and Columns (GC and HPLC)
  • Calculate the Maximum Allowable Working Pressure for Tubing
  • Calculating Column Volume
  • Cannabis Potency Testing: a Reliable, Cost-Effective Method
  • Carbohydrate Analyses in LC
  • Checking Your Intuition - Sub 2 µm vs Superficially Porous
  • Choosing the right GC Injection Technique
  • Choosing the right pore size for size exclusion chromatography
  • Columns, Supplies, and Standards Knowledgebase
  • Consumables Applications and Workflows
  • Consumables Recommended Supplies Lists for Agilent.com
  • Custom Product Request
  • Extreme Makeover – Derivatizations in Chromatography – Part 1 GC
  • Extreme Makeover – Derivatizations in Chromatography – Part 2 LC
  • Fake It Until You Make It: When BioInert Isn’t an Option
  • Flipping Amino Acid Analysis on Its Head
  • Glycans at a glance:  Analyzing therapeutic glycoproteins
  • Handle and Care of Syringes
  • Help! My Peaks Look Strange - Fronting and Tailing in GC
  • Help! My Peaks Look Strange - Saddle Points - LC/GC Troubleshooting
  • How do I select a Split/Splitless liner?
  • Hydrophobic Interaction Chromatography of Proteins and mAbs
  • Importance of Silica Particle Strength for Sub-2 µm SEC Columns
  • KB: Ferrules recommended for GC self-tightening column nut
  • LC and LC/MS Columns - USP Designations
  • LC Column User Guides
  • LC Method Translation - the Dwell Volume
  • Minimize spectroscopy workflow disruptions
  • Minimizing Metals for Best HILIC Results
  • More than just a drink: Analyzing the elemental composition of beer
  • Multi-Attribute Methods – Peptide Mapping Part IV
  • Must See Webinars
  • Nomenclature of CFC's/Freons/Halons/Coolants
  • Oligonucleotide Analysis - Unexpected Details Matter
  • Optimizing Bonding Chemistry for Sub-2 µm SEC Particles
  • Pass the Salt, Please – Mobile Phase Preparation for HIC
  • Pesticides and their stability during GC analyses
  • Pre-Columns - the forgotten art of using retention gaps
  • Problematic polar analytes? Hello HILIC…
  • Protecting your laboratory productivity
  • Recommended Reading
  • Sample Prep Pointers - Peptide Mapping Part I
  • Save your results with sample filtration
  • Simplified cone inspection with the new Agilent LED measuring magnifier
  • Software - Supported Method Development - The Scanview Application
  • Software tool for the ADM Flow Meter (G6691A)
  • Stay Safe: A Win-Win for Solvent Storage
  • Streamline your sample processing
  • The importance of chemical composition for vial performance
  • Tips & Tricks for Amino Acid Analysis – Part I
  • Tips & Tricks for Amino Acid Analysis – Part II
  • Tips & Tricks for Amino Acid Analysis – Part III
  • Tips & Tricks for Amino Acid Analysis – Part IV
  • Tips for Smooth Sailing with HIC
  • Troubleshooting HPLC autosamplers
  • Troubleshooting HPLC degassers
  • Troubleshooting Sequence Coverage – Peptide Mapping Part III
  • UltiMetal Plus Flexible Metal Ferrule
  • UV, MS, TFA, and Formic Acid – What to use? Peptide Mapping Part II
  • What are the typical % Gain or EHT values for hollow cathode lamps?
  • You Need Lamps or Chemical Standards for Atomic Absorption Single-Element Analyses?
Still Need Help?

Post your question in our User Forum or Contact Support.

Achieve accurate and repeatable gas flow meter measurements

Created by kylwilso kylwilso over 2 years ago | Last modified by Agilent Agilent over 2 years ago

A fundamental step towards reliable and repeatable gas chromatography (GC) and creating a robust GC method is to achieve consistent gas flow over time and across diverse laboratories. The flow meter provides researchers an external reference for verifying flows when setting up an instrument and developing a method. It is an integral part of gas chromatography. With todays modern GCs, chromatographers may rely on electronic pressure control (EPC) for setting flow rates. However, many older GCs, that are still in use, do not have an EPC, requiring that flows be set manually using a flow meter.

 

A tool for troubleshooting

Gas flow meter measurements ensure peace of mind in any GC laboratory. Besides verifying flow rates and minimizing the risk of volumetric drift, a flow meter is an essential tool to have when troubleshooting detector problems. Issues with gas flow can appear in a few ways, and it can be difficult to determine the location of the problem without a flow meter. The appearances of shifting peaks or a noisy baseline are both indications of a disturbance in carrier gas flow. By using the new ADM Flow Meter, the researcher can pin point the location of the problem faster.

Gas flow meter measurements generally fall into two categories: volumetric and mass, both of which measure the amount of gas exiting a column or split vent in a specific time period.

 

Introducing the ADM Flow Meter

The new and improved Agilent ADM Flow Meter is a value-priced solution that helps meet the needs of all GC labs. As with previous flow meters, the ADM Flow Meter has been developed to measure the volumetric flow rate of noncorrosive gases. As a result, the user does not need to select a gas type. Current models on the market have to be sent off site to a third party to be calibrated annually. The ADM Flow Meter has an innovative easy swappable calibration cartridge that can be replaced by the researcher once a year to keep the meter NIST compliant.


Types of flow

The ADM Flow Meter provides two different types of gas flow meter measurement: volumetric flow (mL/min) and mass flow reported in standard cubic centimeters per minute (sccm). Mass flow values are calculated from the volumetric measurements by correcting for ambient temperature and atmospheric pressure. The values report the flow rate referenced to 0 °C and one atmosphere of pressure.

 

Volumetric flow mode

The default mode on power-up. In this mode, the volumetric flow rate is displayed in mL/min.

 

Mass flow mode

In this mode, the volumetric flow rate is corrected to account for the current atmospheric pressure and ambient temperature. The flow rate is displayed in sccm (standard cubic centimeters per minute).

 

Split mode

In this mode, you can store a flow measurement as a reference value. You can then compare subsequent flow values as a ratio of the current to the reference measurement, which is useful when troubleshooting a GC Inlet.

 

Storing flow measurements

When in the volumetric flow mode or mass flow mode, up to four flow values can be stored on the screen for reference later.

 

Simplifying calibration

Usually, chromatographers use third party vendors to recalibrate a flow meter. It requires filling out detailed paperwork, and a drawn out process of awaiting a shipping container, returning the meter and waiting weeks for recalibration. If any damage to the valve or speaker is found, the user is often liable for additional costs for repair.

 

The new Agilent ADM Flow Meter comes with a cartridge calibrated to NIST standards, which the researcher can replace by themselves within seconds. The benefits include:

  • Reduced downtime by not sending away the meter for recalibration or repair
  • No geographic or shipping restrictions
  • No time-consuming paperwork

 

A built-in calibration timer automatically warns the researcher when the calibration cartridge needs replacing. It minimizes the risk of volumetric measurement drift and allows the researcher to plan for when they need to order a new calibration cartridge.The ADM Flow Meter has a USB port, enabling downloads of new features and capabilities as well as firmware upgrades as they become available. As a result, the flow meter can always be kept up to date.


Real time monitoring

The ADM Flow Meter can communicate with a PC via its USB port. Data is collected by connecting the USB port to the computer with a USB cable.

Even when accurately calibrated, bubble meters typically read slightly higher than the ADM Flow Meter. The higher reading is due to the relatively high concentrations of water vapor present in the soap bubble apparatus. This property is amplified by the effect of temperature. As the temperatures get warmer, the amount of water vapor increases and the readings can be much higher than the true flow rate. The ADM Flow Meter therefore provides much more accurate results than bubble meters.

For any gas chromatograph, an external reference for verifying flows and a tool for troubleshooting detector problems is always needed. The ADM Flow Meter, with its innovative design that helps maintain it to NIST standards, has everything that is essential to address those needs.

 

For more information and to view a video for the ADM Flow Meter, click here.

 

Keywords;  Gas Chromatograph; ADM flow meter: recalibrate

  • gas chromatograph
  • adm flow meter
  • recalibrate
  • Share
  • History
  • More
  • Cancel
  • Sign in to reply
Parents
  • Dr. Know
    Dr. Know 6 months ago

    If you think your ADM Flow Meter needs repair, please contact your nearest Agilent office. They will connect you to a Consumables Technical Support person to discuss the issue and help you further.

    • Cancel
    • Vote Up 0 Vote Down
    • Sign in to reply
    • More
    • Cancel
Comment
  • Dr. Know
    Dr. Know 6 months ago

    If you think your ADM Flow Meter needs repair, please contact your nearest Agilent office. They will connect you to a Consumables Technical Support person to discuss the issue and help you further.

    • Cancel
    • Vote Up 0 Vote Down
    • Sign in to reply
    • More
    • Cancel
Children
No Data
Was this helpful?
  • Yes
  • No
Thank you for your feedback!

Agilent Community Feedback

Agilent Community Feedback

×
We are glad this was helpful! We are sorry this was not helpful. If you still need assistance please create a community post or contact support. To help us improve, please provide any additional feedback. For full details of how we will treat your information, please view our privacy policy.
Submit Cancel
Submit Cancel
Related
Privacy Statement
Terms of Use
Contact Us
Site Help