The next logical discussion is the second half of the Corrective and Preventive Action (CAPA) subject. According to ISO 9001 section 8.5.3, Preventive Actions identify and eliminate the causes of potential nonconformities in order to prevent occurrence. These are proactive measures, instead of the reactive steps taken for a Corrective Action. The main goal for…Details
Industrial Hygiene & Occupational Health Air Sampling Pump Calibration
- 3 Models with 3 Flow Ranges to Choose From
- 1% Volumetric Accuracy
Environmental & Ambient Air Monitoring Applications & MFC Verification
- 3 Flow Ranges
- 1% Standardized / 0.75% Volumetric Accuracy
Primary Flow Standards for Metrology, Calibration & R&D Laboratories
- 0.5 sccm – 1500 slpm Flow Range
- 0.15% Measurement Uncertainty
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.
In 21 CFR 820 Subpart B, the FDA states “Each manufacturer shall establish a quality plan which defines the quality practices, resources, and activities relevant to devices that are designed and manufactured. The manufacturer shall establish how the requirements for quality will be met.” A quality plan states the goals your company has to improve…Details
If your company holds a 510(k) on a device, the FDA may perform an inspection of your facility for any number of reasons including routinely scheduled investigations or response to a reported problem. These inspections are supposed to happen at least once every two years. There is no requirement, though, for the FDA to give…Details
The FDA requires manufacturers to maintain Device History Records (DHR). Within ISO 13485, there isn’t a specific requirement for a DHR, but it does require the manufacturer to create all of the individual records the FDA requires the DHR to contain. The Device History Record is meant to be a collection of records containing all…Details
Inside Gas Flow Meters
- 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.
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.
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.