Refillable PEI Body pH Electrode with BNC + Pin Connector - HI1332P

SKU: HI1332P

CA$181.00
Ships within 1-2 Business Days

The HI1332P is a PEI body, double junction pH electrode with a BNC and pin connector. The pin connector is used to enable the CAL Check function of the HI2221, HI2222, and HI2223 benchtop meters.

This electrode has a single ceramic junction in the outer reference cell and the pH sensing portion is made with general purpose glass and is protected by an extension of the durable PEI body. This design consideration is ideal for field applications as well as general purpose use.

  • Durable PEI Body
  • Double Junction Design
  • Refillable Electrode

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 HI1332P uses general purpose (GP) glass, spherical bulb, polyetherimide (PEI) body, single ceramic frit, and double junction.

 

Glass

General Purpose 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 LT glass is around 50 megaohms at 25°C. As the temperature of the glass decreases in the sample, the resistance of the LT glass will approach that of GP glass. If using GP glass, the resistance would increase above the optimum range, resulting in increased impedance and ultimately affecting the measurement. The HI1332P is suitable to use with samples that measure from 0 to 70°C.

Spherical Bulb

Spherical Bulb

The spherical bulb is for general purpose use. Other tip shapes include conic for penetration and flat tip for surface measurements.

PEI Body 

PEI Body

The body of the HI1332P is composed of polyetherimide (PEI) resin. The PEI body is suitable for a wide range of applications and excels in field measurements due to its durability. The shielding around the spherical glass tip minimizes breakage due to accidental bumping or dropping of the electrode. The PEI plastic is a high quality plastic that is chemically resistant to many aggressive chemicals.

 

Double Junction

Double Junction Reference

A double junction electrode has an internal compartment surrounding the reference wire. Silver ions are present in the electrolyte of the internal compartment, which houses the Ag/AgCl reference wire; the electrolyte outside this compartment is silver free. The double junction design means that virtually no silver from the electrode enters the sample. This design allows measurement in applications where silver ions in the sample are undesirable or silver precipitates on the junction are likely to form.

din connector

 BNC + Pin Connector

The HI1332P uses a BNC + Pin connector. The BNC type of connector is universal in that it can be used on any pH meter that has the female BNC probe input. The pin connector is used to enable the CAL Check function on the following benchtop pH meters; HI122, HI123, HI221, HI222, HI223, HI2221, HI2222, and HI2223.

 

single vs double junction

 

Conventional electrodes are normally single junction. As depicted by the figure above, these electrodes have only a single junction between the internal reference 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.

More Information
SKU HI1332P
Product Name Refillable PEI Body pH Electrode with BNC + Pin Connector - HI1332P
Quote Required No
Measurement Range pH
Reference Cell Type double, Ag/AgCl
Junction Type/Flow Rate ceramic, single / 15-20 μL/h
Refill Electrolyte 3.5M KCl
Body Material PEI
Tip / Shape spheric (dia
Matching Pin no
Max. Pressure 0.1 bar
Temperature Operating Range 0 to 70°C (32 to 158°F) - GP
Body Length/Overall Length 120 mm / 175.5 mm
Temperature Sensor no
Outer Diameter 12 mm
Cable coaxial; 1 m (3.3’)
Connector Type BNC + pin
Amplifier no
Recommended Use chemicals, field applications, quality control
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