Explosive Gas Mixing and Dilution Applications

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Custom System Focus - Explosive Gas Mixing and Dilution
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.

The 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.

The 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.

Series 4040
Computerized Gas Dilution System
A low cost, computerized gas dilution system with an advanced Windows user interface, the 4040 now supports up to eight mass flow controllers, allowing a broader range of dilutions (up to 10,000:1).

The Environics® Series 4040 is a computerized gas dilution system that automatically generates precise gas standards for rapid multi-point calibration of analyzers.The gas mixes can be used in generating precise gas calibration standards, creating gaseous atmospheres or producing gas mixes for analytical research or production purposes. The Series 4040 can produce gas concentrations from percent to ppb levels for single or multi-point calibration, allowing you to use fewer cylinders.

The system consists of two components: the Series 4040 instrument and the user's personal computer. The user interface is a Microsoft® Windows application that communicates with the Environics system via a USB (standard) or RS232 serial interface.

The Series 4040 consists of a single chassis now supporting up to eight mass flow controllers.The mass flow controllers are factory calibrated using a primary flow standard traceable to the United State's National Institute of Standards and Technology (NIST). Each flow controller utilizes an 11 point calibration table with linear interpolation, to increase accuracy and reduce flow controller nonlinearity.

EXPANDED FEATURES AND BENEFITS

Download Full Datasheet for Series 4040 (pdf)

  • Broad range of dilution ratios (up to 10,000:1) allows the user to significantly reduce the number of cylinders needed to perform compliance tests.
  • Allows multi-point calibration of analyzers.
  • Automatic calculation of dilution and span gas flows.
  • Internally-stored Mass Flow Controller calibration tables.
  • Modular design allows for additional gas circuits to be added.
  • User definable cylinder library allows for easy selection of frequently used gas cylinders. Each cylinder may contain an unlimited number of component gases with automatic K-factor calculation.

 

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About Environics - World Leader in Gas Mixers, Gas Dilution and Calibration Systems
Environics is a world leader in computerized gas flow instrumentation. Our headquarters for design, manufacturing, sales and service is located in a modern 11,000 square foot facility in Tolland, Connecticut. We are ISO 9001 certified, having received ISO 9001 Quality Systems Certification in April, 1997.

We are a profitable, privately held company, founded in 1986 and incorporated in the State of Delaware.  As of April 2011, we are a Women Owned business, certified through the Woman Owned Small Business Program run by the United States SBA.  Our five-year projections show continued growth through the introduction of new products and product innovations. All service is handled factory direct. Sales are handled direct and by selected manufacturers representatives and distributors worldwide

Environics Technology
Our gas mixing technology is based on very precise control of thermal mass flow controllers (MFCs). Normally, thermal MFCs offer an accuracy +/- 1% of full-scale flow. However, when combined with Environics computerization and calibration, this accuracy specification is improved to +/- 1% of setpoint. The Full-scale error vs. Setpoint error document shows the 10x improvement in accuracy of a thermal MFC when using Environics controlling technology. Our calibrators and dilution systems exceed the accuracy required by the EPA for Ambient Calibrators (ref: Method 205, 40CFR51, 40CFR60, 40CFR75). For more technical information, see our Technical Documents section, which contains current articles and CFR's pertinent to our technologies.

We encourage you to challenge us with your most difficult requirements. We specialize in custom systems. We have thousands of systems in the field and have developed an extensive library of applications and solutions to meet our customers' needs. The application of our technology has enabled us to become the world leader in user-friendly computerized gas flow instrumentation.

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