pH and ORP Buffers & Solutions
Manufactured with quality in mind
Using high-quality solutions to calibrate and maintain your sensors is the best way to ensure your data is both accurate and reproducible. When choosing buffers and solutions for pH measurement, pay attention to the quality of the water and chemicals used. Use USP grade water whenever possible.
Thermo Scientific Orion buffers and solutions are manufactured with USP grade purified water and are traceable to NIST certified standards. They undergo rigorous quality testing throughout the process to prevent contamination before and after bottling.
Avoid using low-quality, reconstituted, or expired buffers. These can lead to measurement errors, which require lengthy troubleshooting, or may go unnoticed. Our bottles of buffers have a safety seal to eliminate leaking during shipment and also as a tamper-proof measure.
View the brochure, browse our complete portfolio or let one of our experts help you make a selection.
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Quality pH measurements
The quality of your measurement results depends upon the quality of your standards, buffers, and reagents. We offer a complete selection of quality-assured support solutions for virtually any electrochemistry analysis. Our pH buffers are designed to meet end-user requirements, including laboratory grade and DIN standards. Buffer temperature tables are programmed into the meter software for use with the Auto-Buffer-Recognition feature.
Attention to quality ensures accurate and reproducible measurements:
- USP-grade purified water
- NIST traceability
- Rigorous testing for accuracy and shelf life performance
- Manufacturing in the USA under ISO 9001 standards and strict ecological controls
Electrochemistry expertise enables solution performance and longevity:
- Solutions formulated exclusively for electrochemistry
- Produced using ultra-pure water and chemicals
- Strict control over manufacturing process
- Special handling and packaging when applicable
Extensive application knowledge results in the right solution for your needs, when you need it:
- All the solutions you will need from one high-quality source
- Technical and applications phone support
- Quick and timely shipments ensure measurement readiness
pH buffers and test kits
We offer pH buffers and test kits for a variety of applications. All Orion pH buffers and standards are traceable to NIST reference materials and are available in a variety of sizes ranging from 15 mL single-use pouches to large-volume 19 L cubitainers.
Featured pH buffers and test kits
Orion pH Buffer
Individual Use Pouches
- Color coded: pH 4.01 buffer is pink, pH 7.00 buffer is yellow, and pH 10.01 buffer is blue
- Packaged with buffer/temperature tables for accurate calibrations and NIST traceability
- Manufactured under ISO 9001 quality standards
- Pouches are 15mL each and are available in 10 packs or 25 packs
Orion ORP Standards for Redox/ORP Electrodes
- Stable shelf life without hazardous chemicals
- Included in the new ASTM ORP method
- Used as relative mV standard to calibrate the offset of sample
- +220mV vs. Ag/AgCl using 4M KCl saturated with AgCl filling solution (Part No. 900011), +420mV vs. Standard Hydrogen Electrode (EH)
Orion pH Buffer Bottles
All Orion pH buffer bottles have pH/temperature tables printed on the labels for accurate calibrations and NIST traceability. Manufactured under ISO 9000 quality standards.
Buffer color codes:
- pH 4.01 buffer is pink
- pH 5.00 buffer is orange
- pH 7.00 buffer is yellow
- pH 10.01 buffer is blue
Container sizes: pH buffers and ORP standards
All Orion pH buffer bottles have pH/temperature tables printed on the labels for accurate calibrations and NIST traceability, manufactured under ISO 9000 quality standards. The buffers are available in pint (475 mL) bottles, portable five packs of 2 oz. (5 x 60 mL) bottles, convenient All-in-One buffer kits, 5 gallon (19 L) cubitainers, and single-use pouches. See the table below to identify which size buffers and standards are necessary for your applications.
| Laboratory | Field | Pharmaceutical | Single use | Food and beverage |
|
| 15 mL (0.5 oz.) individual use pouches > available in 10 pack or 25 pack boxes | ✓ |
✓ |
✓ |
✓ |
✓ |
| 60 mL (2 oz.) bottle > available in 5 pack box | ✓ |
✓ |
✓ |
✓ |
|
| 475 mL (1 pint) bottle | ✓ |
✓ |
✓ |
||
| 1 L (0.25 gallon) bottle | ✓ |
✓ |
✓ |
||
| 4 L (1 gallon) bottle | ✓ |
✓ |
✓ |
||
| 19 L (5 gallon) cubitainer | ✓ |
✓ |
✓ |
| Solution | Description | Use with electrodes |
|---|---|---|
| 810007 | ROSS electrode fill solution, 3 M KCl, 5 x 60 mL | ROSS Ultra, ROSS and Micro ROSS Electrodes 800300, 800500U, 8102BN, 8102BNUWP, 8103BN, 8103BNUWP, 8104BN, 8104BNUWP, 8115BN, 8115BNUWP, 8135BN, 8135BNUWP, 815600, 8156BNUWP, 8157BNU, 8157BNUMD, 8157UWMMD, 8163BNWP, 8165BNWP, 8172BNWP, 8175BNWP, 8220BNWP, 8302BNUMD |
| 900011 | Silver Chloride pH electrode fill solution, 4 M KCl with Ag/AgCl, 5 x 60 mL | Standard, Specialty, Single Junction Refillable Green, Micro and ORP Electrodes 9102BNWP, 9103BNWP, 9104BNWP, 9156BNWP, 9157BN, 9157BNMD, 9162BNWP, 9165BNWP, 9172BNWP, 9180BNMD, 9678BNWP, 9778BNWP, 9780SC, 9810BN, 9826BN, 9863BN, GS9156BNWP |
| 900004 | Silver Chloride pH electrode (low level) fill solution, 2 M KCl with Ag/AgCl, 5 x 60 mL |
Standard, Specialty, Single Junction Refillable Green, Micro and ORP Electrodes (low ionic strength samples) 9102BNWP, 9103BNWP, 9104BNWP, 9156BNWP, 9157BN, 9157BNMD, 9162BNWP, 9165BNWP, 9172BNWP, 9180BN, 9180BNMD, 9678BNWP, 9778BNWP, 9780SC, 9810BN, 9826BN, 9863BN, GS9156BNWP |
| 910008-WA | Double junction pH electrode fill solution, 3 M KCl, 5 x 60 mL |
Double Junction, Double Junction Refillable Green and KNIpHE Electrodes 9102DJWP, 9110DJWP, 9120APWP, GD9156BNWP |
| 510011 | No Cal pH electrode fill solution, 5 x 60 mL | No Cal Electrodes 5107BNMD, 5107NC |
| 610001 | pHuture pH electrode fill solution, 5 x 60 mL | pHuture Electrodes |
| 900001 | Single junction reference electrode fill solution, equitransferent solution with Ag/AgCl, 5 x 60 mL | Single Junction Reference Electrode 900100 |
| 900002 | Double junction reference electrode inner fill solution, equitransferent solution with Ag/AgCl, 5 x 60 mL | Double Junction Reference Electrode 900200 |
| 900003 | Double junction reference electrode outer fill solution, 10% KNO3, 5 x 60 mL | Double Junction Reference Electrode 900200 |
Perfectly designed to work together
Orion solutions are an essential part of the entire Orion portfolio of electrochemistry measurement products. Whether you are in the lab or in the field, you can be confident that your Orion benchtop and portable meters, electrodes, accessories, and solutions will deliver the accuracy and repeatable measurements you need, every time.
Benchtop pH Meters
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The ideal choice for dedicated pH testing in water, process, research, and QA/QC samples. The Thermo Scientific portfolio of pH Meters offer a range from simple & economical models to powerful & sophisticated pH meters, to help you analyze your samples with confidence.
Portable pH Meters
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Our portable pH meters are designed to offer pH testing in the field for applications including environmental, drinking water, and wastewater analysis.
Electrodes and Probes
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An extensive assortment of quality pH electrodes and sensors are available in a variety of body materials, body styles, fill types, reference styles, and junctions to meet the needs of your sample measurements.
Orion pH buffer values vs. temperature
This useful guide illustrates how pH buffer values differ according to temperature.
Using high-quality solutions to calibrate and maintain your sensors is the best way to ensure your data is both accurate and reproducible. Learn more about why high-quality solutions deliver correct measurements every time.
Knowledge Base: Certificates of Analysis and SDS for Orion, ROSS, AQUAfast, AquaMate, and AquaSensors products.
Orion Meters Software and Upgrades
Thermo Scientific Orion benchtop and portable meters are designed to help deliver accurate, consistent results, day after day. Boost productivity by upgrading your software today.