The Environics, Inc. Post

Top 5 Maintenance Tips from our Service Department

Posted by Rachel Stansel on Thu, Jan 11, 2018 @ 10:22 AM

We often receive calls and emails asking about the best way to maintain our mixers and dilutors. There are several important things that you can do to keep your unit running in top shape. They will also help you extend the life of your unit.

Check out the Top 5 Maintenance Tips from our Service Department!

zag_with_dew_point_indicator-resized-600.jpgBe sure to replace your consummables. For most units, this is the fan filter. It can be cleaned and reused or replaced. For Zero Air Generators, it is important to replace the media and filters on a regular schedule and to consider the environment you are in and the amount of use the unit gets when setting this schedule. You can check out our recommendations on that here. It is important to routinely check that the drain is running and is free of obstructions as well.

Don't leave gases connected when the unit is inactive. If you won't be using the unit for a length of time, it is best to disconnect the cylinders, purge the unit with air or nitrogen and then cap the inputs. It is also best to leave capped any unused inputs even during use.

3 Be sure input gas lines do not contain moisture. Moisture is the enemy of a gas mixer/dilutor. Be sure that you are using dry clean gases and that there is no moisture in the lines.

4 Check and adjust your MFC zeroes. Over time, the zeroes on your MFCs can change. For best accuracy between annual recalibrations, check these periodically and adjust back within spec. For the detailed instructions, check the manual for your unit. If it's time for recalibration or if your zeroes drift significantly between checks, contact our service department for assistance.

4000_front_view-resized-600.jpg5 Purge the unit of stagnant gas often. Units should be purged with nitrogen or air to flush the system between the blending of gases which may be reactive or clean the system after the use of gases which will present possible risks if left in the system because of toxicity or corrositivity. This can be done either by connecting gas to all inputs and flowing the MFCs at their highest flow rate in flow mode or through the Purge mode. This will flush any gas residue out of the solenoid valves, tubing, mass flow controllers and blend chamber. Starting in 2018, our standard Series 4000/4020/4040 have the purge option available to allow for easy maintenance. Existing units can be retrofit to take advantage of this option as well. You can request more information on this option from our service department.

Bonus tips!

We recommend that you use a UPS (uninterruptible power supply) to protect the unit.

Make sure to ensure proper ventilation for the unit, especially the zero air generator!

For more information on the maintenance of your Environics unit, refer to your manual or contact us!

Tags: customer focus, Environics Inc, gas mixing, Ambient Air calibration, zero air generator, Series 4000, Series 4040, Series 4020, troubleshooting6100, troubleshooting6103, Troubleshooting

Join our Team!

Posted by Rachel Stansel on Thu, Jul 20, 2017 @ 10:10 AM

environics-logo.jpgWe are happy to say that our current VP of Sales is gearing up to retire. That means you have a chance to join our team. We are looking for a new Director of Worldwide Sales. We would like to find someone who has technical experience with gas flow management and an interest in sales. To apply, send your resume to


Position Function:

Develop sales activity and provide leadership towards the achievement of maximum profitability and growth in line with the company vision and values. Target current customers and markets as well as develop additional markets to increase sales. Provide feedback to management, manufacturing and engineering to ensure customer requirements are met.

Responsibilities: To include but not limited to the followin

  • Develops annual sales plans to that ensure attainment of company goals for sales and profitability.
  • Drives sales growth through direct effort and support of the sales organization particularly related to quote generation and product training.
  • Initiates and coordinates development of action plans to penetrate new markets.
  • Manage internal sales, manufacturer representatives and direct account responsibility for distributors of worldwide sales.
  • Provides timely, accurate, pricing reviews, and submittals, while striving to maintain maximum profit margin.
  • Maintain and develop existing and new customer relationships through planned individual account support, liaison between engineering and appropriate distributors and representatives and with inside sales.
  • Assists in the development and implementation of marketing plans and new product opportunities

Requirements and Specifications:

  • 5 to 7 years of experience in sales management.
  • Technical knowledge and experience within the gas flow management systems.
  • Excellent verbal and written communication skills.
  • Team player who can work with any level in the organization.
  • Ability and willingness to travel as required.
  • Knowledge of database, spreadsheet and document development in MS Office.
  • Local candidates preferred.


Tags: Environics Inc, Team

Hypoxia in the News - Possible Cause of Small Aircraft Crash

Posted by Rachel Stansel on Wed, Sep 10, 2014 @ 10:34 AM

Hypoxia was in the news recently after a small aircraft went down near Jamaica. After initialing radioing for permission to descend from 25,000 to 20,000 feet due to an indication of an issue, all communication was lost.  NORAD tweeted that two F-15s were scrambled to the location and that hypoxia was suspected.  The military pilots reported the windows were fogged and the pilot was slumped in his seat, though breathing. The plane continued to fly on autopilot until it crashed north of Jamaica.

Hypoxic conditions can set in as low as 8-10,000 feet, but the symptoms often can go unnoticed until it is too late to react.  Military pilots, and more and more civilian pilots, undergo hypoxia training using the Reduced Oxygen Training Device with the hope that these early signs are recognized sooner so corrective actions (descent to 15,000 and taking in supplemental oxygen) can be taken.  Check out these past posts (here, here and here), to learn more about the effect that hypoxia has on both military and civilian pilots flying at altitude. 

But what causes hypoxia at altitude?  Here's a quick look at the science behind hypoxia.

Environment at Altitude - Pressure

Image of the top layers of the earth's atmosph...

Earth's atmosphere encompasses us with a gaseous envelope which rotates with the planet.   Commonly, it is said that as you go higher in altitude about the ground, the air is "thin."  This implies that there is a change in the composition of the air at altitude, which is not true.  The total blend of gaseous components (predominately nitrogen (78%) and oxygen (21%) remains the same.  What changes is the number of oxygen molecules per unit volume of air.  Why?  Because this is directly affected by pressure, which decreases as you go up in altitude.  So, while the same percent of oxygen is in the air, the actual value is highly lower.  A simple analogy would be that on the ground 21% oxygen is like 21 red marbles in a cup of blue marbles while at altitude, it is 21 red marbles in a bathtub full of blue marbles.

In addition to the change in pressure, the lower temperature at altitude affects the gases.  This effect is not as substantial as that of pressure, but is still important.  The heat comes primarily from the heat of the Earth, not the sun.  So, the higher up, the cooler it becomes (approximately 2°C for every additional thousand feet of altitude).

Science 101 - Gas Laws

A quick refresher of the main gas laws that will come into play.

Dalton's Law -  With constant temperature and pressure, the sum of the component gas pressures in a gas mixture will be equal to the total pressure of the mixture.  So, for our situation, since the percentage of oxygen in the atmosphere is 21%, we can calculate the partial pressure of oxygen at any altitude.  This is key since the partial pressure of oxygen available plays a critical role in determining the onset and severity of hypoxia.

Graham's Law - A gas at high pressure exerts a force on a region of lower pressure.  This can be simplified if you think of it as an attempt to reach an equilibrium.  If there is a permeable or semi-permeable membrane between two gases, and gas will move from the area of higher pressure to the area of lower pressure until equilibrium is reached.  All gases act this way and they do so independently in part of a gas mixture.  It's possible (and actually probably) to gases in a mixture moving in opposite directions across the same membrane.  In terms of the human body, this occurs to transfer oxygen in cells and tissues.

The Human Body at Altitude

Human lung

What does all of that mean in terms of an actual human in a plane at altitude?  Good question!

At sea level, the air that we breathe is at a pressure of 760 mm Hg, with the partial pressure of oxygen being 160 mm Hg (think of Dalton's Law, 21% of 760 mm Hg). By the time the oxygen gets to the lung, we are down to about 14% (106.4 mm Hg) oxygen and an increase concentration of carbon dioxide at a pressure of 41.8 mm Hg.  After sending the oxygen rich blood out to the rest of the body, the returning blood carries oxygen at only 40 mm Hg.  As we determined from Graham's Law, the oxygen will move from the higher pressure in the lung into the blood, where it is low while the carbon dioxide will move in the opposite direction.  This cycle (breath in oxygen rich air, oxygen in the lung moves into the oxygen depleted blood, carbon dioxide moves out of blood, breathe out carbon dioxide rich air) continues with each breath.

And at altitude?

Well, at sea level, the pressure differences that allow the transfer of oxygen are sufficient to cause the blood leaving the lungs to be almost totally (97%) saturated with oxygen. Move up to the top of Pike's Peak (about 14,500 feet) the oxygen saturation drops with the pressure to about 80% and symptoms of altitude sickness appear with any prolonged exposure.  At 25,000 feet, the partial pressure of oxygen in the lung is 14% of 281.8 mm Hg or 39.5 mm Hg.  This is LOWER than the pressure of oxygen in the blood returning to the lung. The transfer of oxygen is therefore interrupted, and a body in this circumstance will quickly lose consciousness.  In between these two altitudes, symptoms from mild vision issues to serious disorientation are seen.

Tags: Hypoxia, ROBD, pilot training, Environics Inc, hypoxia training, ROBD2

Custom System Focus - Explosive Gas Mixing and Dilution

Posted by Rachel Stansel on Thu, Sep 04, 2014 @ 02:24 PM

At Environics, all of our units are custom built for our customers' specific needs.  Customers who need to dilute/mix explosive gases often come to us for help creating highly specialized systems. Most often, this is in order to calibrate gas detectors or for research or calibration purposes.  To meet these unique needs, Environics designed a modified version of our Series 4040 gas dilution system which included a dual chassis design.

explosive gas mixerThe electronics enclosure includes the power supply and PC boards for controlling the Mass Flow Controllers (MFC) and direct acting solenoid valves in the second enclosure. The electronics enclosure connects to a computer via a 9 pin serial port connector and cable. The 4040 software, on the computer, communicates with the microcomputer board inside the electronics enclosure.

explsoive gas dilutionThe second enclosure is sealed and houses the MFCs, valves and components to support the enclosure purge. A continuous purge flows through the enclosure while it is running. This serves two purposes. The first is to carry out heat built up by the internal components. The second is to dilute any potential leaks that may develop. The gas plumbing inside this enclosure was vacuum leak tested to 1X10-8 ATM CC/SEC He.

In addition to continuous purge flow, the enclosure is pressurized to approximately 5” H20 while running the enclosure purge. This provides and indicator that the purge is activated as well as preventing any air leaks into the enclosure from outside. A safety vent was  added to vent the enclosure to atmosphere if the pressure inside the enclosure reaches 20” H20. This could happen if for some reason the purge vent becomes blocked or the pressure on the purge rotameter is too high.

The two enclosures are connected electrically via two control cables labeled MFCs and VALVES. An earth ground wire is connected from the electronics chassis to the aluminum mounting plate inside the purged enclosure. This safely discharges any static electricity that can build up in a system with flow.

Have a similar need or need help with another unique set of conditions?  You can contact us at (860) 872-1111 or here for more information.

Tags: Environics Inc, gas mixing, gas dilution, calibration, customer focus, explosive gas mixing, custom gas mixing system

Update from Our Customer Service Department

Posted by Rachel Stansel on Fri, Apr 04, 2014 @ 10:02 AM

paul resized 600As most of you know, last week marked the last day for our long-time Service Manager, Paul.  After 22 years with Environics, he is moving and starting a new chapter in his life.  We will all miss him and wish him the very best!

With service on our minds, I bring to you today a few of the more commonly asked questions from our customers.  If you have a question, you can always reach us via our website, email or by phone.



gas mixing systemSERIES 2000/9100

My system locked up.  What should I do?

I replaced the system batteries and now I see odd characters on the screen.  Help!

In both of these cases, the system needs to be reinitialized to factory settings using the system configuration data provided with the system.  Tech Bulletin 104 outlines how to proceed.  If you've misplaced your system's data, you can request a copy online.



gas mixerI'm not getting flow but I can hear the solenoids clicking on.  What should I do?

The instrument's configuration data may be corrupted.  Tech Bulletin 107 will walk you through how to confirm the calibration data is in error and show you how to restore it.


SERIES 6100 OR 9100

ambient calibratorI want to recalibrate my ozone generator.  What should I do?

If you are interested in doing this calibration and have the necessary equipment, Tech Bulletin 106 (9100) and Tech Bulletin 114 (6100) will guide you step by step through the process.  Be sure to read through all of the notes on preparing the system prior to calibration.

Tags: Environics Inc, Profile, gas mixing, ozone, ozone generator, gas mixer

Environics Around the Globe

Posted by Rachel Stansel on Thu, Apr 03, 2014 @ 01:31 PM

As a US-based company, we are often asked where we ship internationally.  Both direct and through distributors and reps, we sell worldwide.  

Here is a map of the locations our units have shipped from us over the past few years (the blue pointers are our distributors).

environics sales map

Are you using an Environics system in a location that isn't marked?  Let us know so we can add you to the map!

Tags: Zero Air, Environics Inc, gas mixing, customer focus

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

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

Check out this recent article regarding the use of the Reduced Oxygen Breathing Device in preparing US Air Force Airmen for the "Worse Case Scenario."  The Environics Reduced Oxygen Breathing Device 2 (or ROBD2) plays a key role in that training. 


airmen robd2 trainingThe ROBD2 is manufactured solely by Environics and is a computerized gas-blending system which uses mass flow controllers to precisely generate hypoxic breathing conditions without affecting atmospheric pressure.  Airmen, both pilots and crew, undergo training on the ROBD2 to prepare them for the signs and symptoms of hypoxia that they might feel and to practice the appropriate emergency procedures when that occurs.

Staff Sgt. Vikas Kumar, 92nd Aerospace Medicine Squadron aerospace and operational physiology NCO in charge of training at Fairchild Air Force base stated, "The ROBD2 is what we use here in place of the hypobaric chamber.  There are several advantages to using this system. Not only is it much cheaper to maintain than a chamber, it's a lot less taxing on the body because it doesn't have any atmospheric pressure change involved, making it possible to fly a jet right after if needed, unlike using the chamber, you have a 12-hour restriction."

Check out this video and learn more on the use of the ROBD2 by the Air Force.

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

Winter Weather in New England!

Posted by Rachel Stansel on Tue, Dec 10, 2013 @ 12:19 PM

The weather has been very mild, but we could only escape New England winter for so long! 


Tags: Environics Inc, Team

Happy Thanksgiving!

Posted by Rachel Stansel on Wed, Nov 27, 2013 @ 09:20 AM

A reminder that we will be closed tomorrow and Friday as we celebrate Thanksgiving with our loved ones.

A very Happy Thanksgiving to all of you!

fall foliage resized 600


Tags: Environics Inc, Team, Announcement

Throwback to 1988

Posted by Rachel Stansel on Mon, Nov 11, 2013 @ 09:51 AM

Just for fun, here is a look at an ad from 1988, when Environics was just 2 years old.  It features our discontinued Series 200, which was replaced by our Series 2000 and Series 4000 gas mixers.

series 200 ad 1988 resized 600

Tags: Environics Inc, gas mixing, gas mixer