Page 88 - Praxair - Specialty Gases and Equipment Reference Guide
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Cryogenic Liquids
                                              Cryogenic Monitoring System




                              ™
            Praxair’s StarWatch  Cryogenic Monitoring System                             1
            The StarWatch  Cryogenic Monitoring System – available
                       ™
            exclusively from Praxair – provides a clear digital read-out of
            the liquid level and pressure in your dewar and alerts you with
            an audio and visual alarm when your supply runs low. The
            capacitance-based measurement of the StarWatch system
            provides a leap forward in reliability and accuracy versus
            conventional float gauges.
            When the StarWatch system detects the dewar supply to be                             2
            at or below your alarm levels, the corresponding conditions are
            displayed on the LCD, and the audiovisual alarms are activated
            until acknowledged by the user with a single push of a button.
            When a new low alarm condition is met, corresponding displays
            and alarms are activated again. Low and critically low alarms
            have distinct frequencies, so you can quickly assess your dewar   3          4
            and take action as necessary. The StarWatch system offers
            options to disable either the alarms alone or the measurements
            and alarms together during periods of process inactivity.





              Benefits                                           Features
            n  Easy-to-read, digital liquid level    n  Adjustable low and critically low    1  Audible and visual alarm beacon.
              and pressure indicator    lev el alarms          2  Clear and easy-to-read liquid-crystal display (LCD).
               n    Always know the supply level       n    Customize alert levels to your      Shows the liquid level (percent) and pressure (psi) in the    Section B – Pure Gases
                and pressure in your dewar      application and operations    dewar and indicates whether any alarms are active.
                ± 2 percent (liquid)     n    Enhance security against
                ± 1 psi (up to 60 psig service)     product outage  3  Connection to electronic pressure gauge on liquid dewar.
                ± 10 psi (up to 500 psig       n  Audible and visual alarm    4  Buttons to customize alarm set points. There are four
                service)               indicators                different alert levels: low liquid level, critically low liquid level,
               n    Reduce the risk of product        n    Recognize alarm condition       low pressure, and critically low pressure.
               outage                    through two different modes
               n    Minimize return of unused          of alert
                liquid
                                     n  Dedicated low or high pressure
                                       service
                                        n    Select dewars with pressure
                                         adjustment system suited to
                                        your application
                                        n    Minimize product losses from
                                         safety relief valve venting
                                         during liquid service









            The StarWatch system comes equipped on Praxair’s ProSpec
                                                         ™
            cryogenic dewars – high quality liquid packages dedicated to
            laboratory applications and optimized for either low (liquid) or high
            (gas) pressure service. The reliable ProSpec dewar, combined
            with the StarWatch system’s accurate level and pressure report-
            ing, allows you to stay focused on your work, avoiding process
            interruptions from product outages and the waste associated
            with residual returns.




            1-877-PRAXAIR                     www.praxairdirect.com                                        B•87
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