The Environics, Inc. Post

In the News: ROBD2 Hypoxia Training by the US Air Force

Posted by Dr. Rachel Stansel on Fri, Jan 31, 2014 @ 11:16 AM

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Tags: Environics Inc, Thermal Mass Flow Controllers, Hypoxia, pilot training, hypoxia training, ROBD2

Pittcon 2012 Follow-up: And the winner is.....

Posted by Dr. Rachel Stansel on Thu, Mar 29, 2012 @ 01:01 PM

A big thank you to everyone who stopped by and visiting our team, Terry, Cathy, Patty and Rachel, at Pittcon.  It was great to see so many new faces and to catch up with old friends.  We are pleased to announce the winner of our much sought after golf club is Rob of ICS Laboratories Inc.!  Rob is very excited and promised a picture of his first tee shot.  Congratulations!!

We are very proud of our high quality computerized gas flow instruments and appreciate you taking time to learn more considering investing your business with us.  For those interested, you can learn more about what makes our products the best choice by taking a look at our Gas Flow Management Products or reading through our Technical Documents

At Environics, we are dedicated to customer service before, during and after your system is built.  We stand by our systems and believe in building long-term relationships with our customers.

Our next conference is Aerospace Medical Assoc. Annual Scientific Meeting, May 13-17 in Atlanta.

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Tags: Environics Inc, Profile, Announcement, Thermal Mass Flow Controllers, Small Business, Meetings, Pittcon

Service Agreements for Recalibration now Available!!

Posted by Dr. Rachel Stansel on Thu, Feb 09, 2012 @ 01:54 PM

Every year, we ask our customers for their feedback throughout the year as well as on our annual Continuous Improvement Survey.  We take this input very seriously, discussing the thoughts and suggestions and, when possible, implementing the requests that are made.  One recurring suggestion was the availability of a Service Agreement for Recalibration of our systems. (You can learn more about our Calibration Services here.) 

After many internal discussions, we are proud to announce the availability of Service Agreements on both new and existing systems.  By having a Service Agreement with us, you will save both time and money.  We are happy to help customize your agreement to fit your needs.

The benefits of signing a Service Agreement are:

  • You will lock in the current recalibration cost for the length of your agreement.

  • Your system will be given priority status when it arrives for recalibration. This means less downtime for you!

  • Your will receive a 5% discount on your recalibration cost by prepaying a One-Year Agreement or by signing a Two to Five Year Service Agreement (prepayment not required). This discount is on top of the savings you receive by locking in the current recalibration rates.

To learn more or to request a Service Agreement for an existing system, please contact us at (860) 872-1111 or complete an online request.


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Tags: Environics Inc, gas mixer, Thermal Mass Flow Controllers, ROBD, Series 3000, Service

Importance of Gas Blender Maintenance by the End User

Posted by Dr. Rachel Stansel on Wed, Jul 20, 2011 @ 09:35 AM

Today we conclude our four part series, "Accurate Calibration Gas Using MFC Based Dynamic Gas Blenders."  Tom wraps up by looking at the responsibility of the end user in maintaining the accuracy chain. 


The responsibility of maintaining accuracy lies with the end-user and owner of the gas blender. Input gases fed into any gas blender should be clean and free of moisture. Most anhydrous gases are inert to the standard materials used in a gas blender. However, in the presence of moisture, anhydrous gases can become corrosive. Contamination can develop over time and, if contaminants are carried downstream into the MFC, they can render the MFCs inaccurate. Contamination on the sensor tube walls reduces the effectiveness of the heat transfer between gas and sensor tube and may also block the small inner diameter of the tube, often rendering the MFC completely inoperable. NOTE: Make sure that all gas ports are capped when they are not in use. This ensures that moisture, particulates, and other airborne contaminants will not enter the system plumbing.


When possible, cylinders with 100 percent pure gases should be used. A premixed gas can be the first source of contaminants that lead to errors in the gas blending system.


When uncertified cylinders of premixed gases are used, very large errors can be introduced; a dynamic gas blender cannot compensate for these errors. When there is no choice other than to use a premixed gas, certified cylinders should be used for instrument calibration procedures, especially when guidelines or regulations mandate it.


The most important responsibility incumbent upon the end-user is that he follows all manufacturer-prescribed maintenance and calibration procedures stipulated for that equipment. Even if guidelines and regulations do not mandate calibration of the gas blender used to produce the calibration mixture, the dynamic blender should be calibrated on a periodic basis—typically once every year. Following all these simple guidelines will ensure a long and accurate life of an MFC-based dynamic gas blender.

 

We hope you found this series informative.  To download the full article, please click the button below.

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Tags: Environics Inc, ozone, gas mixing, Ambient Air calibration, Gas Flow, Thermal Mass Flow Controllers, Full Scale Error

Proper Development and Maintenance of an Accurate Dynamic Gas Blender

Posted by Dr. Rachel Stansel on Fri, Jul 15, 2011 @ 01:46 PM

In this installment of Accurate Calibration Gas Using MFC Based Dynamic Gas Blenders, Tom discusses the proper development and maintenance of a Dynamic Gas Blender.

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Tags: Environics Inc, ozone, gas mixing, Ambient Air calibration, Gas Flow, Thermal Mass Flow Controllers, Full Scale Error

Selecting Mass Flow Controllers for a Dynamic Gas Blender

Posted by Dr. Rachel Stansel on Mon, Jul 11, 2011 @ 10:15 AM

Continuing our look at Accurate Calibration Gas Using MFC Based Dynamic Gas Blenders, Tom discusses how to select the right Mass Flow Controllers (MFC).

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Tags: Environics Inc, ozone, gas mixing, Ambient Air calibration, Gas Flow, Thermal Mass Flow Controllers, Full Scale Error

Accurate Calibration Gas Using MFC Based Dynamic Gas Blenders

Posted by Dr. Rachel Stansel on Thu, Jun 30, 2011 @ 02:38 PM

Mass flow devices, developed in the 1960’s, are critical components is systems that produce the specialty gas standards required to calibrate a wide variety of instruments that analyze gases.

Mass flow devices generate a signal that is proportional to the mass flow of a gas. Since the specific heat of a gas is unique to a particular gas, mass flow devices are unaffected by pressure and temperature changes. Thus, the signal they generate is very accurate and stable.

If the signal voltage from a mass flow device is used to indicate flow, it is classified as a mass flowmeter (MFM). If the signal from such a device is used in conjunction with a reference signal and a controlling valve, it is classified as a mass flow controller (MFC).

When several MFC’s are operated in parallel, and are electronically controlled within tight limits, the gas mixtures produced are extremely accurate. This is the principle behind a commonly used gas mixing technique called “Dynamic Blending.”

Dynamic Blending

When a certified gas mixture is ordered from a producer of calibration gases, lead time and price are important considerations. These factors can affect whether your analytical instrument is properly calibrated.

Where volume and urgency are major considerations in meeting calibration requirements, the purchase of a dynamic gas blender may be more cost-effective than purchasing the calibration gas. Dynamic gas blending is preferred to other types of systems that produce calibration standards since they can, in some cases, produce the end product more quickly and at a lower cost, and still ensure high accuracy.

Some dynamic gas blenders that are used to produce mixtures for calibrating ambient air pollutant monitors, also produce precision levels of ozone. This ozone can then be used to calibrate ambient ozone monitors and oxides of nitrogen (NOx) monitors that use gas phase titration with ozone.

Many factors can affect the overall accuracy of an MFC-based dynamic gas blender. These can range from the selection of the MFC to the care taken by the end-user in operating and maintaining the equipment.

To read more about selecting the right MFC, stay tuned for Part II next week!

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Tags: Environics Inc, ozone, gas mixing, Ambient Air calibration, Gas Flow, Thermal Mass Flow Controllers, Full Scale Error

The History and Accuracy of Thermal Mass Flow Controllers

Posted by Dr. Rachel Stansel on Mon, Mar 07, 2011 @ 10:50 AM

Thermal mass flow controllers are used in gas flow applications and utilize heat to measure flow. The heat is introduced into the flow and the dissipation is then measured using one or more temperature sensors.  The operation of thermal flow control is attributed to L.V. King (1).  King’s Law revealed how a heated wire in a fluid flow measured the mass velocity at a point in the flow.

A flow controller's accuracy is typically expressed as a percent of Full-Scale flow (%FS). This means that the flow controller is most accurate when operating at its rated full-scale flow rate. This also means that its accuracy, expressed as a percent of Setpoint, drops off significantly when operating at lower flow rates.

For example, a 1000 cc/min flow controller with a /- 1%FS accuracy, operating at a setpoint of 1000cc/min can be expected to be accurate to /- 1% of the set point. However, when operating at a setpoint of 100 cc/min, the accuracy expressed as a percent of setpoint drops to /- 10% of the setpoint.

Environics instruments use flow controllers calibrated to an accuracy of /- 1% of SETPOINT, NOT FULL-SCALE (2). This means that the accuracy of the flow controller is the same, regardless of the operating point of the flow controller. 

(1) L.V. King, On the Convection of Heat from Small Cylinders in a Stream of Fluid:  Determination of the Convection Constants of Small Platinum Wires with Application to Hot-Wire Anemometry, Phil Trans. Roy. Soc, A214, 373-432, 1914.

(2) http://www.environics.com/tech-support/technical-docs/full-scale-error-vs-setpoint-error/

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Tags: Gas Flow, Thermal Mass Flow Controllers, Full Scale Error