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FEATURES

FEATURES

APPLICATION

The Thermco gas mixer is designed to mix two nonflammable and non-corrosive gases. The gas mixer is normally used with a process where the supply gases are drawn from bulk sources and the mixture is produced on-site where It is supplied to the process by a pipeline. The system is designed for applications that require a very reliable production for mixed gas on a continuous basis. Some of the common applications for the gas mixer are:

Customized designs are frequently manufactured for specific customer requirements.

Food packaging stainless steel NEMA 4X enclosures and stainless steel surge tanks are available for harsh wash down environments in food processing areas. Higher than standard mixed gas outlet pressures are available.

Leak Detection -These systems often require high mixed gas outlet pressures (up to 400 PSIG). These applications should be discussed with the Thermco sales engineer to determine the best design based on available inlet pressure and required accuracy.

Blanketing Atmosphere - These applications require the creation of an oxygen / nitrogen mixture. The mixture may be created from air / nitrogen or oxygen / nitrogen supplies. Because the thermal conductivity of oxygen and nitrogen are very similar, the Thermco thermal conductivity gas analyzer can not be used in these applications. Instead, an oxygen specific analyzer is utilized, based on the electrochemical fuel cell or paramagnetic principle. Gas mixers for this application are frequently built for non-standard pressure conditions and flow rates higher than 5000 SCFH.

Lamp Filling- Precise mixture of nitrogen and argon are used for lamp filling. Special construction to minimize particulate and impurities in the gas mixture is available for this application.

THERMCO GAS ANALYZER

The gas analyzer constantly monitors the mixture produced by the system. The analysis will immediately detect an improper gas mixture being created by conditions such as low pressure in one of the supply gases, a malfunction in the mixing system, or gross contamination in one of the supply gas streams.

The analyzer in the mixing system is a thermal conductivity type manufactured by Thermco. This analyzer is ideal for measurement of two gas mixtures. Calibration of the gas mixture with a known gas is recommended once a year. The weatherproof type gas mixers utilize a thermal conductivity gas analyzer with a temperature controlled detector chamber.

ALARM PACKAGE

A popular option with the gas mixers is automatic alarms to alert personnel when an improper gas mixture is being created. When alarms are ordered on the gas mixing system, the standard analog meter is replaced with a digital meter. This alarm option is described as the alarm package. The alarm package includes high and low alarm contacts on the digital meter, a warning light on the analyzer, and a horn silence button.

In certain situations it may be required that the minor gas, major gas, or mixed gas may be shutoff on an alarm condition. This can be accomplished with the alarm package if the factory is notified at the time the order is placed.

PRINCIPLE OF OPERATION

Thermal conductivity manufactured by Thermco.

RANGE

The range of the analyzer will be the same as the gas mixer, except for the 0 -30% CO2in argon gas mixer, which has analyzer range of 0 - 50% CO2in argon.

READ OUT

Analog versions, 4.5 inch (11.4 cm) meter, nonlinear direct reading scale. The analog readout is only available in CO2argon and oxygen/argon ranges. Digital versions, resolution 0.1%, direct readout in gas percent, built-in microprocessor-based linearity.

SIGNAL OUTPUT

4-20 mA, isolated. This signal is only available on digital models.

NOTICE CONCERNING SUPPLY SYSTEMS

Because these gas mixers operate by intermittently filling a surge tank in the gas mixer, the gas mixer will demand the supply gases at full gas mixer capacity for some period of time, even if the mixed gas demand is small. For this reason, bulk gas supply systems (not portable liquid cylinders) should be used for the major gas, and in some circumstances, the minor gas. Please contact the Thermco sales engineer for guidance.

WARNING

Improper use of this product can cause death, serious injury, or property damage. Personnel dealing with this equipment should read and understand warning labels and instruction manuals provided by Thermco. Only personnel familiar with industrial gases should attempt to install or service this equipment. Gases from high-pressure cylinders must be reduced to the specified pressure before entering the gas mixing system to prevent the possibility of equipment damage and personal injury.

Only use oxygen in gas mixers specifically designed for oxygen service. Gas mixers not designed for oxygen service can not be converted to oxygen service.

Flammable or corrosive gases should not enter these gas-mixing systems.

DOCUMENTATION

Each gas mixer is supplied with two instruction manuals, which include complete wiring and flow diagrams. A complete data sheet is prepared for each gas mixer specifying major parts of the gas mixer and all pressure settings and orifices. A copy of the instruction manual is kept on file at Thermco, and engineering assistance is provided if required. Thermco has been providing service on gas mixers since 1964.

ORDERING

Thermco gas mixers are available through many local industrial gas suppliers. Thermco gas mixers may also be ordered directly from the factory. Before ordering please generate the proper model number by using the system on the rear page of this literature. It is especially important to order the correct pressure conditions for the application. If there are questions, please contact the Thermco sales engineer.