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HI1043P

Refillable Double Junction pH Electrode with BNC + Pin Connector

$195.00

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The HI1043P is a glass body, refillable, 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 high temperature glass.


 


This design consideration is ideal for applications involving Tris buffer, hydrocarbons, paint, solvents, high conductivity samples, strong acids and bases, and for measuring samples at elevated temperatures.

  • Refillable Electrode
  • Double Junction Design
  • High Temperature Glass

Details

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 HI1043P uses high temperature (HT) glass, spherical bulb, glass body, single ceramic frit, double junction and is refillable with 3.5M KCl.

high temperature glass

 

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 HI1043P is used at elevated temperatures the resistance decreases and approaches the resistance of GP glass. The HI1043P is suitable to use with samples that measure from 0 to 100°C.

high temperature glass

 


Spherical Bulb

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

glass body

 

 


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 allow for a fast transfer of heat to the internal reference electrolyte. The mV generated by the reference cell is temperature dependent. The faster the equilibrium the steadier the reference potential.

double junction reference

   

Single Ceramic Double Junction Reference

The HI1043P 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.

refillable  

Refillable

The HI1043P 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.

bnc + pin connector

 

BNC + Pin Connector

The HI1043P has a BNC and pin connector. The BNC 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 Junction Versus Double Junction pH Electrodes

junction types


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. 


Specifications

Body Material glass
Reference double, Ag/AgCl
Junction / Flow Rate ceramic, single / 15-20 μL/h
Electrolyte 3.5M KCl
Range pH: 0 to 14
Max Pressure 0.1 bar
Tip Shape spheric (dia: 9.5 mm)
Diameter 12 mm
Body Length / Overall Length 120 mm / 175.5 mm
Recommended Operating Temperature 0 to 100°C (32 to 212°F) - HT
Temperature Sensor no
Matching Pin no
Amplifier no
Digital no
Cable coaxial; 1 m (3.3’)
Connection BNC + PIN
Applications high conductivity samples, hydrocarbon, paints, sea water, solvents, strong acid and base, tris buffer
Warranty 6 months

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