OmniView Process Software V2.5 – Lab Wizard Module

In June 2020, the engineering team completed testing on version 2.5 of the Omniview Process Control Software for the NIR-O Full Spectrum Process Analyzer. In addition to several bug fixes, this version introduces a wizard to help guided users on how to collect data for model creation and validation. The Lab Wizard is accessible from the analyzer setup window and acts as an alternative to Demand Scan functionality that has existed since version 1 of Omniview.

The lab wizard supports two use cases. The first mode is for the collection of data which will be used to create a new NIR calibration. The second mode is for QC operations and enables users to scan a series of samples with an existing NIR calibration. In both modes, the multiple scans can be exported into a single csv file for post-processing or manual submission to a LIMS system.

Overview

The Lab Wizard module was designed to allow users with a NIR-O process analyzer to collect on-demand scans and export them into a single file that is accessible by other software (Unscrambler© software, LIMS systems, etc.). The functionality of the Lab Wizard runs in parallel to the normal process software functionality. Changing channel configuration settings such as the number of scans to average (coadds) will also change the settings for the spectral data collected by the Scheduler. Additionally, the Scheduler can remain active while the Lab Wizard is running. This enables users to collect on demand scans on specific channels with minimal impact to ongoing operations.

Using the Lab Wizard

1) To enable the Lab Wizard button, click the Lock button,in the Analyzer window.

Omniview V2.5 screen shot of analyzer setup
Omniview V2.5 screen shot of analyzer setup

2) Click the Lab Wizard button to begin,

Omniview V2.5 screen shot of analyzer setup

3) The Setup tab of the Lab wizard allows for the general scope or data-set of the on-demand scans to be defined. A user with Technician level privileges can only select a previously defined data-set from the drop down list. A user with Engineer level privileges can select an existing data-set or create a new data-set by clicking the plus button.

Omniview V2.5 screen shot of lab wizard tab1

Parameters that define a dataset include: file name prefix, file path to export scans to, selecting which channel spectra will be collected on, if any lab reference values will be supplied, if any existing models/methods should be called.  Additionally, lab required meta information such as the time that a sample was pulled can be entered as a lab reference value. The Procedure drop down list is currently a place holder

Omniview V2.5 screen shot of lab wizard tab 1 defining datasets

4) Once a data-set is selected, click the Next button to proceed to the Scan Setup tab.

5. The Scan Setup tab allows for modification by a user with Engineer privileges to change the channel configuration.  

Omniview V2.5 screen shot of lab wizard tab 2

6. The ZERO Scan tab allows for the collection of ZERO scans and follows the same logic as the ZERO Wizard. Both Technician and Engineer users can collect a new zero or proceed with the existing zero scan.

Omniview V2.5 screen shot of lab wizard tab 3

7) The Collect Scans tab allows for data to be collected as defined by the previous tabs. If reference values were setup on the data configuration tab, the user will be prompted for them once the scan is completed. If a sample collection time is to be entered use the date format. Additionally, users will be prompted to provide a comment.  The comment can be a sample name or any other information that may be useful.  Both fields can be left blank. To collect a scan click the Perform Scan Button.

Omniview V2.5 screen shot of lab wizard tab 4

7) The lab reference value or sample scan time can be entered in the popup:

Omniview V2.5 screen shot of lab wizard - defining reference value

8) Once a scan is complete the spectrum will appear in the chart and tabulated data in the table above it. Additional scans added to the collection will appear in both the table and chart.

Omniview V2.5 screen shot of lab wizard populating a data collection

9) To export the collection of scan to a file, click the Export Collected Scans button.  The collection of scans and tabular information will be exported according to the previously selected file format (csv, gwj, etc)

10) Selecting scans in the table enables the deletion button. Scans removed from a collection are still stored in the database. Removing a scan simply removes it from the collection.  The entire collection can be deleted using the Clear Collection button.

Omniview V2.5 screen shot of lab wizard exporting data collection

11) A trend chart of Lab Wizard answers can be displayed by opening the Answer window and selecting the data from the list of available answers. At this time, lab reference values cannot be displayed inside of the OmniView process software. To generate a ‘Predicted vs Actual value chart, use the exported file of the collection.

Omniview V2.5 screen shot of answers trend chart

For more information on how to use OmniView software see our YouTube Channel.

European Sales Manager Retires After 29 Years

Guided Wave recently announced the retirement of André Van Den Broeck, Regional Sales Manager of Guided Wave’s European office located in Aalst, Belgium. André’s retirement was celebrated with a virtual farewell party at the end of June where the entire staff thanked him for his 29 years of dedication to the company. Susan Foulk, Guided Wave President, stated: “Andre will be greatly missed. His knowledge and leadership have been instrumental in our success throughout the years with not only the European office but locations in the Middle East and Asia as well.  We sincerely thank André for all he has done and taught us.”

In 1991 André started as a Customer Support Engineer for Guided Wave and Perstorp Analytical. His duties included hardware and software training in Belgium, the Netherlands, and Luxembourg on NIR spectroscopic analytical systems. Later, the region was extended to encompass Europe, India, and China. After helping create and set-up the sales and support offices in India and China, his responsibilities changed to a focus on Europe and the Middle East.  In 2005, André opened the Guided Wave office in Belgium and was promoted to Regional Manager EMEA (Europe, Middle East, and Africa). At this time, he also became responsible for sales in the region. André was at the forefront of all new product introductions and installations in the EMEA region. From the introduction of the Hydrogen Peroxide Monitor in 1997 to the release of the NIR-O spectrometer in 2018, he was there to support and train customers and new sales representatives on every product. According to Debra Hall, Guided Wave’s Sales and Marketing Director, “André’s experience has been invaluable in the mentoring of the next generation and his legacy will be carried on through our younger Guided Wave specialists worldwide.” She continued, “Thank you Andre for your contributions throughout the years!” Jim Low, Director of Sales and Support,added, “I’ve had the pleasure of working in partnership with André during his entire 29-year tenure, and I’m certain that Guided Wave’s success would not have been possible without him. André, you most certainly will be missed!”

ORTIX Design

André plans to spend his retirement enjoying more time with his wife and family. He is especially looking forward to finally having the time to help his son in Austria with his business, OTRIX, which specializes in graphic design for cars and motorbikes. As Guided Wave loses a talented manager and salesman OTRIX will surely gain from André’s skills and passion.

OTRIX Design

Please join us in congratulating André on his illustrious career and newfound retirement! With sincere appreciation we say good-bye André, and thank you!

Guided Wave Releases Sterilization Market Outlook in Spring 2020 Customer Newsletter

Guided Wave’s spring issue of its customer newsletter, “The Guide Post” was recently released. This issue focuses on current trends in the sterilization industry.

Medical issues that are arising from the COVID-19 pandemic have put sterilization technology at the forefront of the battle. Although many technologies are being considered to help sterilize and disinfect various health and medical items, vaporized hydrogen peroxide (VHP) is one of the few sterilization methods that is effective for virus deactivation and microbial reduction.

As the industry quickly adapts and creates new products to meet this healthcare crisis, this proven and accepted technology can reduce the time to market and ensure safe, reliable results.

In this issue we address the ability and power of NIR online process monitoring, along with Guided Wave’s VHP Analyzer systems, to well-equip the marketplace to meet the current and future sterilization challenges.

In this Issue of The Guide Post Newsletter:

  • Sample Interface – G-SST Vapor Probes for Hydrogen Peroxide Vapor
  • People/ Places:
    • Intern from US Department of Defense Joins GW
    • Dr. Terry Todd Retires
  • Education – Why Pathlength is Important for Sample Interface
  • Events:
    • HPV Analyzer Helps NASA Keep Planets Clean
    • Saybolt Analyzer with Free Fiber and Flow Cell

Download The Guide Post

Join our newsletter mailing list

Meeting the Needs of the Sterilization Industry – Safely and Effectively

Medical issues that are arising from the COVID-19 pandemic have put sterilization technology at the forefront of the battle. Although many technologies are being considered to help sterilize and disinfect various health and medical items, vaporized hydrogen peroxide (VHP) is one of the few sterilization methods that is effective for virus deactivation and microbial reduction. To sterilize large amounts of products quickly and economically Vaporized Hydrogen Peroxide (VHP) Sterilization Isolators have been an effective proven option for over a decade.

VHP Room Bio-decontamination Isolator Advantages:

  • Compatible with many types of material, including sensitive electrical equipment and heat-sensitive parts
  • Rapid cycle and turnaround time
  • Adaptable and easily controlled process
  • Process is easily validated to meet user needs
  • No organic residue, oxygen, and water are the only by-products
  • More efficient and takes less time to process than heat microbial reduction (HMR)
  • Personnel safety and health issues are minimized because of containment
  • May be used in conjunction with various cleaning agents

Global leaders in the sterilization industry have selected and successfully implemented the Guided Wave Hydrogen Peroxide Vapor (HPV) Analyzer on numerous products due to the real-time, repeatable performance. The system can be utilized to:

•  Verify isolation chambers have proper HPV coverage
•  Ensure porous packaged products inside the chambers receive proper HPV dose
•  Confirm other monitors provide correct HPV data and result

As the industry quickly adapts and creates new products to meet this healthcare crisis, this proven and accepted technology can reduce the time to market and ensure safe, reliable results.

As stated in the Enforcement Policy for Sterilizers, Disinfectant Devices, and Air Purifiers During the Coronavirus Disease 2019 (COVID-19) Public Health Emergency Guidance for Industry and Food and Drug Administration Staff, “ the FDA does not intend to object to limited modifications to the indications or functionality of FDA-cleared or FDA-approved sterilizers1

Nevertheless, it is important to make sure that the on-board measurement system is industry-recognized to ensure that reliable results and industry standards are met to such essential sterilization requirements. The power of NIR online process monitoring, along with Guided Wave’s HVP Analyzer systems, are well-equipped to help the marketplace meet the current and future sterilization challenges.

Guided Wave’s Hydrogen Peroxide Analyzer simultaneously measures vaporized hydrogen peroxide and water vapor. By measuring VHP and water vapor continuously, these concentrations can be measured over time during the isolator decontamination cycle and used to determine reaction kinetics. Readings gathered from the HPV Analyzer can ensure that the isolator and sterilant kill load have similar vapor concentration profiles from run to run3.

Guided Wave’s HPV Analyzer is the preferred technology to validate sterilization isolators and whole room bio safety lab sterilization and virus deactivation.

Footnotes:

1 Enforcement Policy for Sterilizers, Disinfectant Devices, and Air Purifiers During the Coronavirus Disease 2019 (COVID-19) Public Health Emergency Guidance for Industry and Food and Drug Administration Staff, March 2020 https://www.fda.gov/media/136533/download

2 Environmental Control in Biological  Production rooms utilizing Vaporized  Hydrogen Peroxide (VHP®) and Ultra-violet Biodecontamination Applications; Steris Life Sciences Case Study 7, 2004 Download

3 Comparing and Contrasting Barrier Isolator Decontamination Systems Jim Fisher and Ross A. Caputo*, Pharmaceutical Technology, www.pharma.com, Nov 2004

Vaporized Hydrogen Peroxide – Applications and Monitoring Solutions

Sterilizing medical instruments in autoclave

Vaporized Hydrogen Peroxide is one of the few sterilization methods that is effective for virus deactivation and microbial reduction. This blog post discusses various aspects of the sterilization market and the need for spectroscopic monitoring equipment for validating hardware and sterilization cycle design.

Reducing Nosocomial or Hospital-Acquired Infections, Miniaturizing Technology for Table-Top Office Sterilizers

The future of the sterilization market is in small semiportable sterilization isolators geared towards doctors’ offices and other front-line medical personnel. The driving force behind the adoption of this technology is the reduction of nosocomial or hospital-acquired infections. Medical equipment is routinely disinfected with alcohol between each patient, but that is not always enough to properly disinfect the instruments. By placing medical equipment, such as a stethoscope into a microwave sized chamber, medical staff can be assured that the item is properly sterilized. If a protocol is established to effectively and efficiently sterilize equipment after each patient is treated nosocomial infections will be reduced.

Using Spectroscopy to Compliment Rapid Biological Indicators

Biological indicators (BI) are the final go/no go of sterilization testing. By placing biological indicators in the sterilization chamber with the load (product to be sterilized), technicians can verify to regulatory standards that a kill dose of sterilant was received. Guided Wave’s HPV analyzer was developed to complement BI technology, by providing a real-time read-out of the sterilant concentration. If a biological indicator shows that a kill dose was not received the data produced by the Hydrogen Peroxide Vapor Analyzer can be used to help explain what went wrong with the sterilization cycle.  By combining biological indicators with spectroscopy, engineers designing the next generation of tabletop sterilizers can reduce the time to market for new products.

Benefits of Simultaneous Measurement of Water Vapor and Peroxide Vapor Concentration

A critical parameter during sterilization cycle development and validation of new sterilization hardware is that the product’s (item to be sterilized) surface is exposed for a minimum amount of time to the correct concentration of sterilant. In the case of vaporized hydrogen peroxide, one parameter to consider is the decomposition rate of hydrogen peroxide to water. By simultaneously measuring the water vapor and the hydrogen peroxide vapor, reaction kinetics can be determined.1 Spectroscopy is an accurate and reliable method to simultaneous determine water and hydrogen peroxide vapor.

The reaction kinetics (adsorption, absorption, and decomposition) of vaporized hydrogen peroxide (VHP) in a vacuum isolator will deviate from theoretical calculations as calculated by a mass balance equation.2 The Hydrogen Peroxide Vapor Analyzer uses near-infrared spectroscopy to measure the actual VHP and water vapor concentrations, corrections to reaction kinetics can be determined.  

Moreover, the water concentration is a critical measurement because it helps the engineers developing the sterilization cycle to avoid condensation. If hydrogen peroxide begins to rain inside of the sterilization chamber, the liquid may corrode or damage the products being sterilized. Condensation will also negatively impact the ability of the optics in the G-SST probe (link) to function as desired.

According to the scientific study by Corveleyn3 spectrally gaseous Water (H2O) has near-infrared absorbance peaks located at 1364 nm, 1378 nm, and 1400 nm. Whereas Hydrogen Peroxide Vapor (H2O2) was determined to have an absorbance peak located at 1420 nm. By selecting these wavelengths with the corresponding baseline corrections. The Hydrogen Peroxide Vapor Analyzer is factory calibrated to account for the interference. 

Why use Vacuum Sterilization?

Creating a vacuum is a critical part of many hydrogen peroxide sterilization systems. By pulling a vacuum inside of the sterilization chamber the air and other contaminants are removed. This prevents the air and contaminates from breaking down the hydrogen peroxide vapor prior to it reacting with the bacteria. Additionally, the vacuum may help drive the sterilant gas into the packaging material. The vacuum also increases the effectiveness of any aeration at the end of the cycle to neutralize the sterilant.

Monitoring the Vaporized Hydrogen Peroxide Concentration in Walk-in Vacuum Sterilization Isolators

Walk-in sterilization systems are used for high volume sterilization. Carts or mobile racks of the product can be loaded into and out of the isolation chamber to ensure high throughput. To ensure that proper mixing is achieved several G-SST probes can be placed in the isolation chamber. The data generated by the multiple probes provides a profile gradient that can be monitored during the sterilization process. Determining the sterilant gradient inside of a reaction chamber is an important step in validating the design of the chamber.

Bio-safety Room Decontamination and Virus Deactivation

Similar to isolators, BioSafety labs are large rooms used for biological experiments. Due to the nature of the research conducted, these rooms require periodic decontamination and virus deactivation. The National Cancer Institute (NIH) Research and Production Center at Ft. Detrick, Maryland uses vaporized hydrogen peroxide to decontaminate whole areas and rooms. The NIH facility uses spectroscopy to monitor sterilant levels in hard to access locations. Mounting a G-SST probe instead of a biological indicator in these locations saves time and increases technician safety. Learn more about this customer success story.

References

  1. https://pdfs.semanticscholar.org/9171/1c2b3ab32a797ac259598be912023a413549.pdf
  2. Brown, et al., “Calibration of Near-Infrared (NIR) H2O2 Vapor Monitor,” Pharm. Eng. 18, (6), 66–76, (1998)
  3. Corveleyn, S., Vandenbossche, G.M.R. & Remon, J.P. Near-Infrared (NIR) Monitoring of H2O2 Vapor Concentration During Vapor Hydrogen Peroxide (VHP) Sterilisation. Pharm Res14, 294–298 (1997). https://doi.org/10.1023/A:1012085702372

NASA uses HPV Analyzer to Help Keep Planets Protected

HPVA Helps Keep Plants Clean

NASA is going to Mars in 2020. The Mars 2020 Rover Mission is specifically looking for life on the Red Planet and will hunt for microscopic fossils. NASA is using Guided Wave’s Hydrogen Peroxide Vapor Analyzers (HPVAs) to help ensure that everything leaving Earth is sterilized so they don’t contaminate Mars.

The Guided Wave HPV analyzer is a simple turnkey solution for the measurement of hydrogen peroxide and water (H2O2 and H2O) concentrations in vapor phase. These are both measured together because they are codependent. The analyzer operates in real-time, which takes the guesswork out of determining the H2O2 and H2O concentrations during cycle development and throughout the actual sterilization cycle. NASA will gain continuous, accurate data for documentation and validation by using Guided Wave’s HPVA.

Why Choose Vapor Hydrogen Peroxide (VHP) Sterilization

Thermally sensitive electronics and hardware on modern spacecraft are not compatible with heat microbial reduction (HMR).  As a result, various low temperature vapor phase sterilization methods were considered. Ethylene oxide with Methyl bromide and Formaldehyde with Paraformaldehyde leave organic residue. Consequently, these alternatives are not ideal for organic sensitive hardware. On the other hand, Hydrogen peroxide (H2O2) does not leave organic residue. Oxygen and water are the only by-products. VHP is also cheaper, ideal for heat-sensitive parts, more efficient and takes less time to process than HMR.

The Jet Propulsion Laboratory (JPL) at the Biotechnology and Planetary Protection Group conducted literature review and research work to define process specifications in order to pursue vapor phase hydrogen peroxide (VHP) as an alternative sterilization technique. Quoted from their site,

“During research work, microbes were selected to test the lethality of the technique, including Bacillus stearothermophilus, Bacillus subtilis var. niger, Bacillus pumilus and Bacillus circulans.”

The microbes were deposited on different materials including aluminum, polymer, paint, and epoxied graphite. Following the research work and results, NASA PPO granted approval to use this technique for spacecraft subsystems and systems.

The initial stage for VHP sterilization involves a vacuum chamber where water is evacuated from the environment. In the next stage, H2O2 is injected into the chamber. In the third stage, sterile filtered air is injected into the chamber, which allows H2O2 vapor to penetrate the packaging and diffusion restricted areas to enhance the efficacy of the sterilization process. In the final stages of the process, the chamber is evacuated once more, followed by venting with sterile filtered air: the concentration of hydrogen peroxide vapor returns to ambient levels and the enclosure can be opened to retrieve contents.

NASA PPO has approved the use of VHP as a low-temperature sterilization modality, for simple surfaces, with specifications for time, rate, and H2O2 concentration levels. Complex geometries (e.g., vented boxes and electronic chassis inside the warm electronics box of a rover), however, require further directions. Thus, an additional study aims to describe the effect of VHP on electronic materials, materials with different configurations, solder joints, etc. Work has also begun for developing a portable VHP system that can be used locally (e.g., at the site of hardware integration in a cleanroom or on the launch pad).

Collecting Samples from Mars and the Consequences

For the first time, the Mars 2020 rover, carries a drill that can collect core samples of the most promising rocks and soils. The rover will set them aside in a “cache” on the surface of Mars. A future mission could potentially return these samples to Earth. That would help scientists study the samples in laboratories with special room-sized equipment that would be too large to take to Mars.

The question of “is there life on another planet?’ is an ancient thought. However, the consideration of protecting that life – is a relatively new one.  If life does exist on other planets, such as Mars, then we need to consider the consequences of what might occur when material is accidentally or inadvertently transferred between plants. Addressing these consequences is at the forefront of NASA’s Planetary Protection Policy.

NASA’s Planetary Protection Policy and Contamination

NASA, Jet Propulsion Laboratory, California Institute of Technology states,

“Planetary Protection addresses microbial contamination of the solar system by spacecraft that we launch from Earth (forward contamination). This contamination must be prevented in order to preserve the integrity of exploring the solar system; celestial bodies that may have once held an environment suitable for life (e.g., Mars and outer planet icy bodies) are especially vulnerable. Likewise, extraterrestrial contamination of the Earth and Moon (backward contamination), by way of sample return missions, must be prevented. We must approach with caution and preparedness in bringing unknown and potentially dangerous biological materials back to Earth.

While searching for life on the surface of a solar system body (via life-detection instruments) or in future samples returned to Earth, contamination could result in the “false-positive” indication of life. Thus, Planetary Protection’s primary strategy to prevent contamination is to confirm that spacecraft launched from Earth is clean. This precaution ensures that planets, and any life that might be there, remain in their original pristine state for scientific analysis. After the hardware is treated with various forms of microbial reduction, technicians assembling the spacecraft frequently wipe hardware surfaces with an alcohol solution to keep the spacecraft clean. Planetary Protection engineers carefully sample the surfaces and perform microbiology tests to show that the spacecraft meets the specified requirements for biological cleanliness.

In addition to this mission implementation role, the Biotechnology and Planetary Protection Group seeks to develop or adapt modern molecular analytical methods to rapidly detect, classify, and/or enumerate the widest possible spectrum of Earth microbes carried by spacecraft (on surfaces and/or in bulk materials, especially at low densities) before, during, and after assembly, test, and launch operations. Additionally, the group aims to identify new or improved methods, technologies, and procedures for spacecraft sterilization that are compatible with spacecraft materials and assemblies”

From the white paper The Evolution of Planetary Protection Implementation on Mars Landed Missions “ 

….”Cleaning and sterilization are distinctly different operations. Sterilization is the process to kill live microbes, while cleaning is a process that physically removes live and dead microbes and debris from hardware surfaces. The most commonly used current spacecraft hardware cleaning methods are precision cleaning and alcohol wiping. While these methods are efficient for cleaning massive contamination, they are not effective for removing micron and submicron-sized microbes and debris from hardware surfaces.

NASA planetary protection regulations state that a surface may be considered “sterile” if a microbial burden of less than 300 aerobic bacterial spores per meter2 can be treated to achieve a 104-fold reduction in viable endospores (spores).”  To read the entire paper link here

Count Down to NASA’ Mars 2020 Launch
The launch window for NASA’s Mars 2020 Rover named Perseverance is between July 17 – August 5, 2020. This time frame is the best landing opportunity as Earth and Mars are in good positions relative to each other. Consequently, it will take less power to travel to Mars in comparison to other dates when Earth and Mars are in different positions in their orbits. Landing is estimated for February 18, 2021. The mission duration is approximately 687 Earth days which is at least one Mars year. Guided Wave is excited to have our HPVA equipment be a part of this historic event.

NASA is determined to get its life-hunting Mars rover off the ground this summer despite the coronavirus outbreak.

Saybolt Color Analyzer Specially Priced Offer

Get Free Fiber and Flow Cell with Saybolt Analyer – Limited Time Offer

Simply request a quote by May 31st to get these savings and buy before December 31, 2020.

Get a Saybolt Analyzer System with FREE Sample Interface and Fibers for a limited time, Guided Wave is offering a Saybolt Analyzer including a free flow cell and the fiber cabling. (Fibers and the flow cell supplied are based on a standard configuration. Other configurations are available on request.)

The complete “ready-to-go” analytical system includes:

  1. Saybolt Analyzer (ClearView db photometer platform)
  2. Fiber Optic Cables (to remote the analyzer electronics from the sample point)
  3. Sample Interface (choice of Axial or Multi-Purpose Flow Cell)
  4. Control Software (built-in and pre-calibrated)

Get Your Quote Now and Lock in the Promotional Price and Savings!

With these uncertain times, we understand it may be hard to commit to purchasing soon. However, get your quote now and lock in this special promotional price, even if you buy later. Your quote with lower prices will be honored through the end of 2020. Remember there is no obligation to buy.

The Saybolt color scale varies from near water white (30) to dark yellow (-16).

Saybolt Color Scale (ASTM D156)

Guided Wave flow cells can measure the full range. But, if you need optimal precision at the high saybolt range then choose the 50mm pathlength Axial Flow Cell. Remember high saybolt means no color, low saybolt means high color.

Additional Options Available

  • Custom fiber length
  • Additional color scales such as ASTM can be added
  • ATEX Certification Ex d B+H2 T6 Gb Tamb -20°C to +40°C
  • Power Supply Converter
  • AC to 24VDC Power Supply
  • Spare Lamp for ClearView db
  • Field Service Start-up
  • Gold Brazed In-situ Transmission Probe

Reliable Saybolt Color Measurement with Low Maintenance

When accurate, actionable color data is critical, the Guided Wave Saybolt Color Analyzer is the preferred choice. Its linearity and repeatability, as well as, its low maintenance make it a cost-effective, smart choice to help optimize production, improve yields, ensure consistent product quality and enhance profitability.

Don’t miss this money-saving opportunity and complete the form below to receive a Saybolt Promotional Quote. To see the datasheet with specifications email [email protected] guided-wave.com or call for a free application review +1 916-648-4944 

Fiber Length Calculator

Need help estimating the maximum recommended distance between your analyzer and insertion probe or flow cell? Let Guided Wave’s Process Grade Fiber Length Calculator do the math for you. Simply pick a wavelength.

How to Choose Pathlength: for APHA Color

Pt-co-Scale
APHA Color Scale

The APHA/Platinum-Cobalt color scale is described in ASTM D1209. The ASTM method is an off-line manual laboratory method. The original test design required an observer to compare the color of a product to a known standard, and then judge the “color”. This color scale ranges from 0 to 500. The lowest value of 0 is referred to as water white. A value of 500 is distinctly yellow. (Above illustrates the contrast from 0- 100 range.)

Two Different Pathlengths are Recommended for APHA Applications

If the user needs to measure the whole range, then we recommend a 30 mm pathlength for either an SST Insertion Probe or MultiPurpose Flow Cell. This allows for long enough pathlength to measure the lightly colored samples and but short enough to still collect light for the dark samples. Conversely if the customer is interested in measuring the lightly color samples with scores less than 300 units, we recommend the 50 mm pathlength. The longer pathlength allows better precision for distinguishing between lightly colored samples.

Still Need Help Selecting a Pathlength?

Guided Wave selects a pathlength for the sample interface that provides the best solution from a technical and economic standpoint. Finding the balance between the signal-to-noise of the measurement and cost to manufacture, as well as accessibility for cleaning/maintenance by the user is always Guided Wave’s priority.  For more information contact us.



New Intern Joins from US Department of Defense

Guided Wave is proud to announce that Keaton Wakefield has joined our team as a software development intern. Keaton is part of the United States Department of Defense Skills Bridge program which links service members nearing the end of their enlistment with internships in industry. Keaton is currently working with Dr. Ryan Lerud and Dr. Steve Elam on improving the functionality of the OmniView software used with the NIR-O Full Spectrum Near Infrared Analyzer. According to Dr. Elam, “Keaton is a quick learner and is helping to bring new ideas to our development process. In just a few short weeks he has already contributed code improvements that will be included in our next software release.”

Keaton is currently attending Community College at American River College in Sacramento California. He is working for a degree in Software Engineering. Upon completion of the degree, Keaton plans on getting a job with a process automation company.

Thanks for your service Keaton and welcome to Guided Wave!