Refillable Combination pH Electrode with BNC Connector - HI1131B

In stock
The HI1131B is a glass body, refillable, double junction, combination pH electrode with a BNC connector. This electrode has a single ceramic junction in the outer reference cell and the spherical pH sensing portion is made with high temperature glass. This design consideration is ideal for laboratory samples, beer and other liquid samples, as well as general purpose use.

Conventional electrodes are normally single junction. As depicted by the figure above, these electrodes have only a single junction between the internal refernce wire and the external solution. Under adverse conditions, such as high pressure, high temperature, highly acidic or alkaline solutions, the positive flow of the electrolyte through the junction is often reversed resulting in the ingress of sample solution into the reference compartment. If this is left unchecked, the reference electrode can become contaminated, leading to complete electrode failure. Another potential problem with single junction electrodes is the clogging of the junction due to silver chloride (AgCl) precipitation. Silver can be easily precipitate in samples that contain Tris buffer or heavy metals. When the electrolyte solution makes contact with the sample, some AgCl will precipitate on the external face of the junction. The result is drifty readings obtained from the sensor. Hanna’s double junction system, as the name implies, has two junctions, only one of which is in contact with the sample as shown in the figure. Under adverse conditions, the same tendency of sample ingress is evident. However, as the reference electrode system is separated physically from the intermediate electrolyte area, the contamination of the electrode is minimized. The likelihood of clogging of the junction is also reduced with a double junction electrode since the outer reference cell uses a fill solution that is “silver-free”. Since there is no silver present, there is no precipitate that can form to clog the junction.




Specification Name Detail
Description refillable, combination pH electrode
Reference double, Ag/AgCl
Electrolyte 3.5M KCl
Max Pressure 0.1 bar
Range pH: 0 to 13
Recommended Operating Temperature 0 to 100°C (32 to 212°F) — HT
Tip / Shape spheric (dia: 9.5 mm)
Temperature Sensor DIN model only
Amplifier DIN model only
Body Material glass
Cable coaxial; 1 m (3.3’)
Recommended Use laboratory general purpose, beer
Connection BNC
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