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HI1131B Refillable Combination
Hanna Instruments offers a wide variety of pH electrodes that are designed for many different applications. The type of glass used for sensing pH, bulb shape, body material, type of junction, type of reference and electrolyte used are just some of the design considerations. The HI1131B uses high temperature (HT) glass, spherical bulb, glass body, single ceramic frit, double junction and is refillable with 3.5M KCl. HI1131B Refillable Combination
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℃ while the resistance of HT glass is around 400 megaohms at 25℃. As the HI1131B is used at elevated temperatures the resistance decreases to approach the that of GP glass. The HI1131B is suitable to use with samples that measure from 0 to 100℃. HI1131B Refillable CombinationSpherical 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. HI1131B Refillable Combination
Single Ceramic Double Junction Reference
The HI1131B 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 frit. 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. HI1131B Refillable Combination
Refillable
The HI1131B is a refillable probe. Since it is a double junction pH electrode the fill solution is the HI7082 3.5M KCl. This solution does not contain any silver as with single junction electrode. The absence of silver will prevent any silver precipitate from forming at the junction surface and clogging it. Clogging of the junction will result in drifty and erratic readings. HI1131B Refillable Combination
BNC Connector
The HI1131B uses a BNC connector. This type of connector is universal in that it can be used on any pH meter that has the female BNC probe input. Other type of connectors include DIN, screw type, T-type, and 3.5mm to name a few. These types of connectors tend to be proprietary for a particular type of meter and are not interchangeable. HI1131B Refillable CombinationSingle Junction Versus Double Junction pH Electrodes
| SKU | HI1131B Refillable Combination |
| Name | Refillable Combination pH Electrode with BNC Connector – HI1131B |
| Measurement Range | pH: 0 to 13 |
| Reference Cell Type | double, Ag/AgCl |
| Junction Type/Flow Rate | ceramic, single / 15-20 µL/h |
| Refill Electrolyte | 3.5M KCl |
| Body Material | glass |
| Tip / Shape | spheric (dia: 9.5 mm) |
| Matching Pin | no |
| Max. Pressure | 0.1 bar |
| Temperature Operating Range | 0 to 100°C (32 to 212°F) – HT |
| Temperature Sensor | no |
| Cable | coaxial; 1 m (3.3’) |
| Connector Type | BNC |
| Amplifier | no |
| Recommended Use | general purpose, high temperatures, laboratory general purpose |
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