Page 88 - Praxair - Specialty Gases and Equipment Reference Guide

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