COLO.Science — WATER QUALITY / ELECTROCHEMISTRY — PRO5981
Ultra-Pure Water Electrode PRO5981
PRO5981 ultra-pure water electrode is a premium glass pH electrode for accurate pH measurement in ultra-pure water, low-conductivity water and Tris buffer workflows. It is designed for applications where conventional pH electrodes may show slow response, unstable readings or drift due to very low ionic strength. With a 0–11 pH range, glass sensor material, Longlife Reference, unmovable glass grinding mouth junction, 3 M KCl fill solution, 0–80 °C working temperature and S7 connector, PRO5981 is suitable for purified-water QC, pharmaceutical laboratories, biotechnology, semiconductor support laboratories and research use.
| Overview | HTML Spec | Quote | |
| Electrochemical Instruments | pH Meters | Video Coming Soon | Water Quality Knowledge |
COLO.SCIENCE — PH ELECTRODES / ELECTROCHEMISTRY / WATER QUALITY
Premium glass pH electrode for ultra-pure water and Tris buffers
The PRO5981 ultra-pure water electrode is intended for laboratories that measure pH in samples with very low conductivity. Ultra-pure water, deionized water and distilled water have low ionic strength and low buffering capacity, which can make pH measurement more sensitive to electrode design, sample handling and stabilization time.
PRO5981 uses a premium glass body, Longlife Reference system and unmovable glass grinding mouth junction to support stable pH readings in demanding purified-water workflows. The S7 connector should be matched with the correct meter input or S7-BNC(Q9) cable before ordering.
Key features
- Ultra-pure water electrode for low-conductivity and high-purity aqueous samples.
- Premium glass pH electrode for ultra-pure water and Tris buffer workflows.
- pH range 0–11 for purified-water and laboratory pH measurement.
- Longlife Reference system for stable reference behaviour.
- Unmovable glass grinding mouth junction for demanding low-conductivity samples.
- 3 M KCl fill solution and glass sensor material.
- Φ12 × 185 mm body format with S7 connector.
Suitable for
- Ultra-pure water and low-conductivity water pH measurement.
- Deionized water, distilled water and purified-water QC workflows.
- Tris buffer pH measurement in biotechnology and research laboratories.
- Pharmaceutical laboratories and water system support checks.
- Semiconductor support laboratories and sensitive analytical workflows.
- Laboratories requiring a premium glass pH electrode with S7 connection.
TECHNICAL SPECIFICATIONS — PRO5981 ULTRA-PURE WATER ELECTRODE
| Model / SKU | PRO5981 |
| Product type | Premium glass pH electrode for ultra-pure water / Tris |
| Electrode structure | pH composite electrode |
| Recommended sample type | Ultra-pure water, deionized water, low-conductivity water and Tris buffers |
| pH range | 0–11 pH |
| Reference type | Longlife Reference |
| Fill solution | 3 M KCl |
| Sensor material | Glass |
| Junction material | Unmovable glass grinding mouth |
| Working temperature | 0–80 °C |
| Dimension | Φ12 × 185 mm |
| Connector type | S7 |
Final measurement performance depends on the pH meter, electrode condition, buffer quality, sample handling, sample conductivity, temperature conditions, storage procedure and laboratory method. Connector compatibility must be confirmed before quotation.
Ultra-pure water electrode structure and practical laboratory use
Premium glass pH body
The glass electrode body supports demanding pH measurement where stable response is required in ultra-pure water, low-conductivity samples and Tris buffer applications.
Longlife Reference
The Longlife Reference system is intended to support stable reference behaviour and improved measurement reliability in purified-water laboratory workflows.
Glass grinding junction
The unmovable glass grinding mouth junction helps maintain stable liquid junction behaviour in low-ionic-strength samples where standard electrodes may drift.
VISUAL REFERENCE — ELECTRODE AND CONNECTOR
PRO5981 electrode body and S7 / S7-BNC(Q9) connector reference
Main electrode: PRO5981 premium glass pH electrode for ultra-pure water, low-conductivity samples and Tris buffer workflows.
Connector reference: PRO5981 uses an S7 connector. For meters with BNC input, confirm the required S7-BNC(Q9) cable.
COLO.SCIENCE VIDEO
PRO5981 video presentation is in preparation
The video will present ultra-pure water pH measurement, low-conductivity sample handling, S7 connector matching, electrode storage, calibration practice and practical use with compatible COLO.Science pH meters.
COLO.SCIENCE ELECTROCHEMISTRY
Match PRO5981 with compatible pH meters and electrochemical instruments
PRO5981 should be selected together with the meter input configuration. Use the electrochemical instruments overview and pH meter section to confirm compatible instrument families, pH electrode inputs, cable requirements, temperature probe options and required accessories.
| Electrochemical Instruments | pH Meters |
COLO.SCIENCE KNOWLEDGE / OUTBOUND LINK
Learn more about pH measurement, calibration and water quality analysis
Correct pH measurement in ultra-pure water depends on electrode selection, fresh calibration buffers, clean vessels, stabilization time, storage solution, temperature conditions and routine electrode maintenance. Explore additional electrochemistry and water quality resources before selecting the final configuration.
| Read on COLO.Science → | NIST reference → |
Applications and laboratory value
Ultra-pure water QC
PRO5981 is suitable for purified-water and ultra-pure water checks where a dedicated low-conductivity pH electrode is required for stable measurement behaviour.
Pharmaceutical laboratories
The electrode is relevant for laboratory workflows involving purified water, low ionic strength samples and routine quality control where electrode choice affects reading stability.
Biotechnology and Tris buffers
PRO5981 supports Tris buffer workflows where a premium glass pH electrode and stable reference behaviour are important for reliable laboratory measurement.
Research and sensitive water samples
The electrode is useful in analytical chemistry, semiconductor support laboratories and research environments working with low-conductivity water samples.
How to choose the correct ultra-pure water electrode configuration
When selecting the PRO5981 ultra-pure water electrode, the complete measurement setup should be checked, not only the pH range. Confirm the meter model, S7 or BNC input, required S7-BNC(Q9) cable, sample type, expected conductivity level, calibration procedure and whether a separate temperature probe is required.
COLO.Science can help match PRO5981 with compatible pH meters, calibration buffers, electrode storage solutions, cables and accessories so that the final configuration supports the intended laboratory method and daily measurement workflow.
PRO5981 ultra-pure water electrode for low-conductivity pH measurement
The PRO5981 ultra-pure water electrode is a specialized pH electrode for laboratories that need reliable measurement in high-purity water, deionized water and low-conductivity aqueous samples. These samples are more difficult to measure than ordinary buffered solutions because they contain very few ions and can be easily affected by contamination, carbon dioxide absorption, vessel condition and electrode response behaviour.
In daily use, the quality of pH measurement depends on more than the electrode specification. Buffer freshness, calibration frequency, clean sample handling, stabilization time, electrode storage, junction condition and the selected pH meter all influence measurement stability. PRO5981 provides a premium glass ultra-pure water electrode platform, while the final laboratory setup should be defined as a complete pH measurement system.
Configuration notice
pH electrodes may be delivered or used in different configurations depending on the selected pH meter, connector/cable arrangement, temperature probe, calibration solutions and accessories. The official quotation defines the final scope of supply. Website content is provided for general product presentation and may not represent the exact delivered configuration. Specifications may change without notice.
COLO.Science · Ultra-Pure Water Electrode
PRO5981 is a premium glass ultra-pure water electrode for low-conductivity water and Tris buffers, with Longlife Reference, 3 M KCl and S7 connector.
pH 0–11 · Glass · Longlife Ref. · 3 M KCl · 0–80°C · S7 · SKU PRO5981
