ASI is excited to announce the availability of its Optical Dissolved Oxygen Test System later this year. If you were at Pittcon 2012 in Orlando, you may have seen it being demonstrated. This new product offers our custom- ers the latest in dissolved oxygen measurement technology as a complete test system at a very affordable price. This technology is based on the proven optical sensor method whereas oxygen concentration is determined by the luminescent quenching of a dye embedded on the sensing surface. Unlike polarographic or galvanic sensors, this optical electrode does not require filling solutions, maintenance, sample flow, nor a “warm-up” time. It also has no measurement drift and is considered a faster, more accurate methodology - especially below 2 ppm where the other technologies can lose resolution. This optical technology also does not consume oxygen, which lends to it’s low range accuracy and making sample flow unimpor- tant. ASI will continue to supply and develop polarographic and galvanic sensors for our customers to meet the lower price point and reasonable performance that these technologies provide, and to service the large installed base of meters they are used on. The graphical display on the Optical Dissolved Oxygen Test System’s meter will provide the analyst with the dis- solved oxygen concentration in both mg/L and % saturation, sample temperature, barometric pressure, date & time, battery status, and measurement mode. It will be very easy to read in low light conditions and the contrast (Continued on page 2) Optical Dissolved Oxygen Test System will provide additional test capabilities for our customers. We value your feedback and needs as a customer. We would like to think we are meeting your product needs in electrochemistry but we know there are likely some ideas or solutions we could be offering to meet your business objectives. As you know, we excel in low-cost manufacturing capabilities for high quality elec- trodes, laboratory accessories, injection-molded or machined parts, component as- sembly, and other products and services. Maybe there is a chemical parameter you desire a test method for or a flow cell or electrode insertion that you need a solu- tion for? Our engineering staff can help you take your concept to production, or our sales staff can provide you with a quotation for an existing product that you would like to get a lower price point for. With our state of the art manufacturing facilities in both the United States and China, we can offer the best from both regions. Contact any of our staff listed on the next page to get your ideas started! ASI TODAY ASI TODAY A Newsletter for Customers of Analytical Sensors & Instruments, Ltd. A Newsletter for Customers of Analytical Sensors & Instruments, Ltd. Spring 2012 Spring 2012 Optical DO 1 Feedback Request 1 Chemist Corner 2 Connect with Us 3 Product Spotlight 3 From the President’s Desk 4 Inside this issue: www.asi-sensors.com phone: (281) 565-8818 FAX: (281) 565-8811 Page 1 Tell us what you are looking for
Transcript
ASI is excited to announce the availability of its Optical Dissolved Oxygen Test System later this year. If you were at Pittcon 2012 in Orlando, you may have seen it being demonstrated. This new product offers our custom-ers the latest in dissolved oxygen measurement technology as a complete test system at a very affordable price. This technology is based on the proven optical sensor method whereas oxygen concentration is determined by the luminescent quenching of a dye embedded on the sensing surface. Unlike polarographic or galvanic sensors, this optical electrode does not require filling solutions, maintenance, sample flow, nor a “warm-up” time. It also has no measurement drift and is considered a faster, more accurate methodology - especially below 2 ppm where the other technologies can lose resolution. This optical technology also does not consume oxygen, which lends to it’s low range accuracy and making sample flow unimpor-tant. ASI will continue to supply and develop polarographic and galvanic sensors for our customers to meet the lower price point and reasonable performance that these technologies provide, and to service the large installed base of meters they are used on. The graphical display on the Optical Dissolved Oxygen Test System’s meter will provide the analyst with the dis-solved oxygen concentration in both mg/L and % saturation, sample temperature, barometric pressure, date & time, battery status, and measurement mode. It will be very easy to read in low light conditions and the contrast
(Continued on page 2)
Optical Dissolved Oxygen Test System will provide additional test capabilities for our customers.
We value your feedback and needs as a customer. We would like to think we are
meeting your product needs in electrochemistry but we know there are likely some
ideas or solutions we could be offering to meet your business objectives.
As you know, we excel in low-cost manufacturing capabilities for high quality elec-
trodes, laboratory accessories, injection-molded or machined parts, component as-
sembly, and other products and services. Maybe there is a chemical parameter you
desire a test method for or a flow cell or electrode insertion that you need a solu-
tion for? Our engineering staff can help you take your concept to production, or our
sales staff can provide you with a quotation for an existing product that you would
like to get a lower price point for. With our state of the art manufacturing facilities
in both the United States and China, we can offer the best from both regions.
Contact any of our staff listed on the next page to get your ideas started!
ASI TODAYASI TODAY A Newsletter for Customers of Analytical Sensors & Instruments, Ltd.A Newsletter for Customers of Analytical Sensors & Instruments, Ltd. Spring 2012 Spring 2012
is adjustable. The software will allow a one or two point calibration procedure and uses multi-ple proprietary algorithms to increase accuracy, versus common linear algorithms. We expect the sensing membrane to last well over a year in most applications and it will require very infre-quent calibration.
ASI’s optical DO technology is based on the following methodology:
• The sensor has a “lumiphore” or dye material on its surface.
• An LED directs blue light to the sensor surface. • The blue light causes a reaction on the lumiphore material. A red light is emit-
ted as the material reacts.
• The time for the red light emission is measured by the optical sensor.
• A red LED is used as a reference for comparison. • The more oxygen present in the sample causes a decrease in the red light emission time. This red light emission time is measured by the optical sensor
and correlated to the oxygen concentration.
• Proprietary ASI algorithms increases accuracy versus common linear algorithms
This product will be released later this year and we are interested in customer feedback and opportunities. Contact your ASI Account Manager or send an e-mail to [email protected] with “Optical DO” in the subject line to get the latest information on this exciting new offering from ASI.
(Optical DO Test System — continued from page 1)
Dissolved Oxygen is the focus of this issue of the ASI Today Newsletter. With the pre-
view of our new Optical DO Test System later this year, we have been doing a lot of
testing on this parameter and want to share some information.
Dissolved Oxygen is a fact of life for water. It comes from the atmosphere, as well as from aquatic plants and al-
gae. It’s concentration is strictly controlled by three parameters: Pressure (influenced by weather conditions and
altitude or elevation), Temperature, and other Dissolved Ions (typically referred to as salinity or TDS). In fact, the
100% saturation point of oxygen in water is a very dynamic, moving target because of these three factors! And,
dissolved oxygen can be supersaturated in water and that’s why most meters have a specification that allows for
0-200% saturation! Luckily, any modern dissolved oxygen meter will have software that factors these three influ-
ences and gives you a valid answer. However, check your meter manual to make sure you are not overlooking a
user-input data point like salinity or pressure. Oftentimes temperature and pressure are automatically measured
by sensors, but salinity (and sometimes pressure) is often needed to be input manually based on a reading from a
conductivity meter or a barometric pressure reading from the weather service for your locality. Calibration of a
dissolved oxygen meter usually involves a single point at 100%. This is typically achieved by either vigorously bub-
bling atmospheric air into a sample of water, or by creating a humidity chamber that simulates 100% water satu-
rated air—in theory this is equal to 100% air saturated water. Some meters allow you to input a Zero calibration
point. This is easily achieved by adding Sodium Sulfite to a water sample, in excess, until all oxygen is converted
to Sodium Sulfate and becomes undetectable by the sensor. Contact ASI’s Technical Support for resources or tech-
nical support on the measurement of dissolved oxygen in water.
