The interconnections and procedures followed when using gas flow measurement instruments are critical to obtaining accurate flow measurements. Errors can be introduced from: Interactions between flow sources and flow measurement instruments Interconnecting plumbing Thermal instabilities Pressure variations Mesa Laboratories piston provers are designed to minimize these effects. Connecting volume is the gas volume between two…Details
Environmental & Ambient Air Monitoring Applications & MFC Verification
- 3 Flow Ranges
- 1% Standardized / 0.75% Volumetric Accuracy
The instruments produced by Mesa Labs are the #1 calibration products in the US because of their quality, performance and ease of use.
What is DryCal Technology?
See why our innovative dry piston technology eliminates the need for messy, cumbersome bubble provers and offers the superior accuracy, reliability and ease of operation that has made Bios DryCal products the first choice of flow professionals worldwide.
Whether your calibrator is out for service, our you just need a few extras temporarily for a large project, we’ve got you covered. Learn more about how easy and affordable it is to fill in any gaps in your monitoring process.
Construction workers are being cautioned to lower their exposure to asphalt fumes. Despite warnings from the American Board of Industrial Hygiene, OSHA has yet to publish a permissible exposure limit to the contaminant. More than 50,000 workers are exposed to the fumes every year. According to OSHA, exposure can result in headache, skin rash, fatigue,…Details
Mesa Labs would like to invite our customers and friends to visit us at the upcoming AIHA-RMS & ASSE CO Chapter Technical Conference in Arvada, Colorado September 20-21. AIHA and ASSE join forces to conduct the 22nd Annual Fall Technical Conference to share knowledge across industries. If you are interested in learning more about our…Details
Mesa Labs is proud to announce a new rental service to our DryCal customers! Whether you’ve sent your Defender or Definer in for service, are conducting a short-term project, or have accidentally dropped your calibrator into a smelter, Mesa Labs offers a comprehensive rental program to meet your needs and limit downtime, all while maintaining…Details
Inside Gas Flow Meters
Selecting a gas flow meter can be complex task with several key parameters and attributes to consider. With several options in the marketplace, it can become a monumental task comparing features and benefits with your process and regulatory needs. With our decades of experience and several thousand units in the field, these are the main 3 items that we find most helpful to customers when looking for a gas flow meter.
- Flow Range
From a purely technical standpoint, flow is the measurement of a quantity of fluid (liquid or gas) that moves past a point per unit time. You are essentially measuring how much “fluid” moves through the system over time. Regardless of the process, knowing how much material you will flow is necessary from the initial design of your flow system to quality control. In the case of flow controllers and meters, they require calibration by equipment that can match their flow range. The DryCal product line now includes products that span flow ranges as low as 0.5sccm, up to 1500slm.
Having a documented, defensible calibration is critical for any organization. The question that comes up is: “what accuracy do you need?”. As much as everyone can agree on the advantages of primary standards over transfer standards, level of accuracy is not as clear cut. In some industries 4:1 is the norm, some have less stringent requirements, some more so. Amongst the Defender, Definer, and Met Lab lines of DryCal products, Mesa Labs can provide you with the right product for your needs; offering superior measurement uncertainties as tight as 0.15%.
- Gas species
So, you are measuring gas flow through your system. You may ask yourself, what happens to my system if I decide to flow a different species of gas? Will anything in my system change? In many cases that answer is yes, things will change. Many types of gas metering and gas controlling hardware are impacted by the species of gas flowing through them. As these devices typically use indirect methods to identify flow such as thermal change or differential pressure. These methods rely on the particular behaviors of a specific gas. The DryCal primary flow standards are not plagued with these issues. As the technology used is direct measurement of a volume per time, the data is unaffected by gas species. That means you can calibrate all your different equipment that flow different gases with the same DryCal. Mesa Labs offers different series of calibrator to accommodate a variety of flow ranges and different applications.
Keeping these items in mind will make your selection of the appropriate gas flow meter for your specifications much more successful. Identifying the important parameters ahead of time will ensure that you are making an appropriate investment. Let Mesa assist with your decision making process, contact us for specialized consultation today.
The volumetric flow rate (V) is the measure of a volume of fluid (gas) passing a point in a system per a unit of time. The volumetric flow rate can be calculated as the cross sectional area (A) for flow and the average flow velocity (v). Stated mathematically as:
In terms of a round cylinder the flow rate is:
V=Pr2v if we substitute v=d/t
V=Pr2d/t V= (area) x (distance)/(time)
This is the basic equation used in calculating the volumetric flow rate for all DryCal units.
Note: Some of the units used for volumetric flow include L/m, ccm, m3h, cfm, and cfh.
The standardized flow rate (Vs) is the volumetric flow rate corrected for both pressure and temperature. When using the standardized flow rate, the reference pressure and temperature are usually fixed at standard conditions. These conditions are usually defined as 1 atm (760 mmHg) for pressure and 273°K (0°C) for temperature. These corrections are based on the ideal gas law. The relationship of standardized flow rate (Vs) to the volumetric flow rate (V) is:
Where: Vs = the standardized flow rate at 760 mmHg and 0°C (273°K)
V = the volumetric flow rate
T1 = the absolute temperature of V (K)
P1 = the atmospheric pressure of V (mmHg)
Note: Sometime the reference temperature may be something other than 0°C.
Note: Some of the units used for standardized flow include sL/m, sccm, sfm, and scfh.
Most of the time it is based on the device you are testing (DUT). The DUT may either be outputting volumetric or standardized flow. Basic pumps are volumetric. Mass flow controllers (MFC’s) are standardized. Do not confuse the two, as the difference can be quite substantial. It should also be noted that certain MFC’s are not standardized to 0°C, but to 21.1°C (70°F). This too will make a difference in the standardized flow measurement.
Note: This is handled by a setting on all standardized DryCal units.
What we offer
- Primary Calibration Standards
- Accurate and reliable gas flow readings independent of gas species
- Corrosive and Combustible Gas Compatibility
- Fully accredited ISO-17025 calibration & manufacturing facility
- ±0.08% Scope of Accreditation for gas flow by NVLAP of NIST
- Manufacturing & Quality Control
- Occupational Health & Safety
- Environmental & Ambient Air Monitoring
- Metrology, Calibration & R&D Laboratories
- MFC/MFM Calibration
- Semiconductor Processing
Trusted. Traceable. Defensible.
Bios DryCal primary gas flow standards are precision measuring tools designed to provide highly-accurate flow measurements each time they’re used, in any number of applications. An annual NIST-traceable calibration by Mesa’s ISO accredited facility provides a defensible audit trail as well as the periodic care and maintenance your instrument requires.
DryCal Pro Software
Easily record flow data from your calibrator to a PC by downloading a free trial of our DryCal Pro Software! Mesa Labs DryCal Pro Software is a new offering for the Bios DryCal product line. DryCal Pro works with all of our calibrators and allows you to take the data from your Bios DryCal instrument and export it directly to a Microsoft environment.