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SAES Total Quality Shield - TQS and SAES Roof are the most advanced technological solutions for precise, reliable and safe mercury dispensing in Linear Fluorescent Lamps. These products have been developed at SAES Getters Group in close co-operation with customers to fully comply with the real needs of cutting-edge lamp production technologies. TQS and Roof innovative approach consists in offering total mercury yield under extremely safe operation conditions.
SAES products total mercury yield is obtained, after lamp tip-off, when TQS or Roof are heated for some time at high temperature.
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Total Quality Shield - TQS
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TQS and Roof are reliable low mercury dosing products capable to release very small quantities of mercury. The adoption of TQS and Roof in fluorescent lamps production allows being compliant with the existing and upcoming more stringent environmental regulations that will be imposed.
TQS is usually mounted to replace one of the lamp cathode shields, while Roof is mounted on top of, or on one side of the lamp cathode. These mercury dispensers can withstand the typical manufacturing process of fluorescent lamps without any problem.
The quality of TQS and Roof is continuously monitored by on-line checking systems, in order to guarantee the maximum reliability and reproducibility of mechanical features and of the mercury dose. |
Product Composition & Models
TQS and Roof are based on SAES Getters' High Yield GEMEDIS material and incorporate a copper-tin family of promoters to ensure that St 505, the proprietary titanium-mercury inter-metallic compound, maximizes Hg release. The lamp performance and lifetime are boosted by SAES St 101 zirconium-aluminum getter alloy, which is part of TQS and Roof structure: after activation, the Non-Evaporable Getter alloy starts absorbing gaseous impurities in the bulb, such as hydrogen that is known to increase lamp starting voltage, and oxygenated gases, which could irreversibly trap Hg through the formation of mercury oxide.
St 505, in combination with the promoter and St 101, are coated in different tracks on a nickel plated iron wide strip: TQS and Roof can be customized to specific application requirements, offering extreme flexibility in terms of geometry and number of powder tracks.
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Roof | The products are capable of withstanding temperature processing in air up to 450 °C without losing mercury, and are suitable to dispense mercury in high-speed horizontal lines, horizontal lines and vertical lines.
Product Activation
TQS and Roof release Hg and start gettering action after lamp tip-off through a specific process, the so called “activation”. During activation, TQS or Roof are heated by radio frequency induction up to 800-900 ºC for 15-30 seconds.
The mercury release is enhanced and accelerated by the presence of the copper-tin promoter. The heating process also allows the getter to get active and remove impurities in lamp.
TQS Typical Hg yield curve
Learn more about the competitive advantages that our TQS and Roof can deliver by downloading the full products datasheet.
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