HI-1131S REFILLABLE COMBINATION PH ELECTRODE WITH SCREW CAP CONNECTOR
HI-1131S
Perfect for any laboratory use, the HI-1131S is a glass-bodied combination pH electrode with a screw cap connector.
With a double junction design and the ability to change out contaminated electrolyte, this economical pH electrode ensures great results in your laboratory, clean water testing and beer production.
- High temperature glass can stand up to the effects of elevated temperatures leading to longer probe life
The HI-1131S uses high temperature (HT) glass, spherical bulb, glass body, single ceramic reference, double junction and is refillable with 3.5M KCl.
High Temperature Glass Formulation
The measurement of pH at very high temperatures is detrimental to the sensitive glass bulb and will shorten the life of it. A pH electrode with general purpose (GP) glass will have a resistance of 100 megaohms at 25°C, while the resistance of HT glass is around 400 megaohms at 25°C. As the HI-1131S is used at elevated temperatures, the resistance decreases to approach that of GP glass. The HI-1131S is suitable to use with samples that measure from 0 to 100°C.
Spherical Glass Tip
The spherical bulb is for general purpose use. Other tip shapes include conic for penetration and flat tip for surface measurements.
Glass Body
The glass body is ideal for laboratory use. The glass is resistant to many harsh chemicals and is easily cleaned. The glass body also allows for a fast transfer of heat to the internal reference electrolyte. The mV generated by the reference cell is temperature dependent. The faster the electrode reaches equilibrium, the steadier the reference potential.
Single Ceramic Double Junction Reference
The HI-1131S is a double junction design. pH electrodes are available as single junction or double junction. See below for a complete description of the differences. The junction also known as a salt bridge is necessary component of the electrical circuit. The movement of ions must flow through the junction for a steady reading. The outer reference has a single ceramic reference. The ceramic is a porous material that is easily fused with the glass body and has a similar expansion coefficient. A single ceramic junction has a flow rate of 15-20 μL/hour. Other junction types are available with higher flow rates and made with different materials.
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| Reference | single, Ag/AgCl | |
| Junction/Flow Rate | ceramic, single / 15-20 µL/h | |
| Electrolyte | KCl 3.5M + AgCl | |
| Max Pressure | 0.1 bar | |
| Range | pH: 0 to 13 | |
| Recommended Operating Temp. |
0 to 100°C | |
| Tip/Shape | spheric (dia: 9.5 mm) | |
| Temperature Sensor | no | |
| Amplifier | no | |
| Body Material | glass | |
| Cable | coaxial; 1 m (3.3’) | |
| Connection | Screw cap |
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