COLO.Science · Technical Specification
PRO5981
Premium Glass pH Electrode for Ultra-Pure Water / Tris
Ultrapure water and Tris buffer pH electrode · Longlife Reference · unmovable glass grinding junction · S7 connector
PRO5981 pH Premium Glass Electrode is designed for accurate pH measurement in ultra-pure water, low-conductivity water and Tris buffer solutions, where standard pH electrodes may show slow response, unstable potential or measurement drift. The electrode uses a glass body, Longlife Reference system and unmovable glass grinding mouth junction to support stable liquid-junction behavior in demanding high-purity water workflows.
Ultra-pure waterTris compatiblepH 0-110-80 °CGlass bodyLonglife Ref.Glass grinding junction3 M KClS7 connectorΦ12×185 mm
PRO5981 · premium glass pH electrode · ultra-pure water / Tris application
Model / SKUPRO5981
pH electrode
pH electrode
Address / HQPolje ob Sotli 4
SI-3255, Slovenia
SI-3255, Slovenia
Contactsales@colo.si
+386 64 222 724
+386 64 222 724
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PRO5981 · Premium Glass pH ElectrodeTechnical data sheet · Informational document · Controlled electronic document
Product page: Ultra-pure water electrode on colo.si
Product page: Ultra-pure water electrode on colo.si
PRO5981 · technical specificationpH premium glass electrode for ultra-pure water and Tris buffer measurement
pH range 0-11Working temp. 0-80 °CGlassLonglife Ref.3 M KClS7- Specialized electrode for high-purity water and Tris buffer laboratories
Product Overview
Application profile
Ultra-pure water: optimized for pH measurement in deionized, distilled and high-purity water samples.
Tris buffer solutions: suitable for biological and biochemical buffer work where Tris compatibility is required.
Low ionic strength: intended for samples where standard electrodes can drift, respond slowly or become unstable.
Extended reach: Φ12×185 mm body supports deeper vessels, flasks and laboratory setups requiring a longer electrode.
Design and measurement advantage
Composite pH electrode: pH measuring element and reference electrode are integrated in one practical probe.
Glass body: selected for chemical compatibility and stable laboratory measurement behavior.
Unmovable glass grinding junction: supports stable liquid junction potential in difficult high-purity water samples.
Longlife Reference: designed to provide durable reference behavior in demanding routine applications.
Key features
pH measurement: specified pH range from 0 to 11.
Body / sensor material: glass electrode body and sensor construction.
Reference system: Longlife Reference for stable operation.
Junction: unmovable glass grinding mouth junction.
Electrolyte: 3 M KCl fill solution.
Connection: S7 connector for compatible S7 cable or S7-BNC(Q9) cable setup.
Core technical summary
| Parameter | Specification |
|---|---|
| Model / SKU | PRO5981 |
| Electrode type | pH composite electrode for ultra-pure water / Tris |
| Fill solution | 3 M KCl |
| Sensor material | Glass |
| Reference type | Longlife Reference |
| Junction material | Unmovable glass grinding mouth |
| pH range | 0-11 |
| Working temperature | 0-80 °C |
| Dimensions | Φ12×185 mm |
| Connector | S7 |
Sample typeUltra-pure water / Tris
pH range0-11
ReferenceLonglife Ref. · glass grinding junction
ConnectorS7
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Technical Specifications
Electrode construction and measurement profile
| Parameter | Specification |
|---|---|
| Product name | pH premium glass electrode for ultra-pure water / Tris |
| Model / SKU | PRO5981 |
| Electrode type | pH composite electrode |
| Measurement parameter | pH |
| Recommended sample type | Ultra-pure water, low-conductivity water, deionized water, distilled water and Tris buffer solutions |
| pH range | 0-11 pH |
| Working temperature | 0-80 °C |
| Sensor material | Glass |
| Reference type | Longlife Reference |
| Junction material | Unmovable glass grinding mouth |
| Fill solution | 3 M KCl |
| Dimensions | Φ12×185 mm |
| Connector type | S7 |
Compatibility and use notes
| Topic | Technical note |
|---|---|
| Meter input | Requires compatible S7 connection or an S7-BNC(Q9) cable for pH meters with BNC input. |
| Temperature compensation | This is a pH electrode. Temperature compensation depends on the connected meter and separate temperature probe configuration. |
| Calibration | Calibrate with fresh pH buffers according to laboratory method, expected pH range and purified-water measurement practice. |
| Low-conductivity practice | Allow sufficient stabilization time and avoid sample contamination during measurement. |
| Storage | Store and clean according to the applicable laboratory method and electrode storage guidance. |
Product selection table
| Selection item | Specification / guidance |
|---|---|
| Recommended use | pH measurement in ultra-pure water and Tris buffer solutions where conventional electrodes may be unstable. |
| Best fit | Pharmaceutical water systems, biotechnology labs, purified-water QC, semiconductor support labs and research laboratories. |
| Handling advantage | Long glass electrode body supports deep vessels and stable laboratory positioning. |
| Reference design | Longlife Reference system for stable reference behavior in demanding applications. |
| Junction behavior | Unmovable glass grinding mouth junction supports stable contact between reference system and sample. |
| Instrument match | Confirm S7 connector compatibility or required S7-BNC(Q9) cable before ordering. |
| Product page | Open PRO5981 product page |
| Request quote | Contact COLO.Science for configuration confirmation |
Specification note
Connector matching: confirm whether the meter requires S7, BNC(Q9) or an S7-BNC(Q9) cable before ordering.
Low-conductivity practice: ultra-pure water has very low buffering capacity, so clean vessels and stable conditions are important.
Tris application: confirm method requirements and buffer type when selecting electrodes for biological buffer workflows.
Quotation control: final supplied configuration, cable, accessories and documentation should be confirmed in the official COLO.Science quotation.
Technical values are provided for product selection and orientation. Final delivered configuration, electrode type, accessory set, connector/cable arrangement and documentation should be confirmed through the official COLO.Science quotation or manufacturer-confirmed offer.
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Electrode Body and Connector Visual Support
Visual reference and functional elements
Electrode body: glass shaft in Φ12×185 mm extended format for laboratory holders and deeper sample vessels.
Sensor area: pH-sensitive measuring end intended for low-conductivity and ultra-pure water pH measurement.
Reference system: Longlife Reference system to support stable performance in high-purity water and Tris buffers.
Junction: unmovable glass grinding mouth junction for stable liquid-junction behavior.
Connector: S7 connection; use compatible S7 connection or S7-BNC(Q9) cable when connecting to BNC meters.
Product image references
Compatibility notice - connector and meter matching are essential
PRO5981 uses an S7 connector. When the pH meter has a BNC input, an S7-BNC(Q9) cable is required. Before ordering, verify the exact meter connector type, cable requirement and whether a separate temperature probe is needed for the intended measurement workflow.
Selection and Use Notes
For ultra-pure water
Sample handling: use clean vessels and avoid CO₂ absorption or contamination during measurement.
Stabilization: allow adequate reading stabilization time because low-conductivity samples respond differently from buffered samples.
For Tris buffers
Application fit: intended for pH work in Tris buffer solutions and high-purity water workflows.
Method check: verify buffer composition, temperature and calibration routine before measurement.
For ordering
Connector: confirm S7 connection or S7-BNC(Q9) cable requirement.
Documentation: request final quotation confirmation for supplied cable, packaging and accessories.
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COLO.Science · Final Support PageContact and Configuration Confirmation
COLO.Science support
PRO5981 · Premium Glass pH Electrode for Ultra-Pure Water / Tris
For quotation, connector confirmation, cable selection and delivery configuration, please contact COLO.Science. Confirm meter connector type, required cable, sample type and any temperature compensation requirement before ordering.
Quick contact
Configuration before purchase
Need to match PRO5981 with a pH meter?
Send the meter model, required connector type and sample application. COLO.Science can confirm the correct S7 / S7-BNC(Q9) cable arrangement and quotation configuration.
Disclaimer: This technical specification is an informational COLO.Science document prepared for product selection and communication. Product images, connector details, accessories, supplied cable configuration and technical values may be updated or adjusted by the manufacturer. Only the official quotation, order confirmation or manufacturer-confirmed technical documentation should be treated as the binding specification for procurement, tender or validation purposes.
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