Titanium Body pH Electrode for Boilers and Cooling Towers with Quick DIN Connector

SKU : ce0aafeaad6b

The HI729113 is a titanium body, polymer filled, double reference junction pH electrode with a Quick DIN connector. This flat tip sensing portion of this electrode is made with general purpose glass. The HI729113 also has a PTFE type junction along with a built-in temperature sensor and amplifier within a single probe design. This design consideration is ideal for measuring the pH in boilers and cooling towers. The HI729113 is designed for use with Hanna’s HI99141 pH meter.

  • Titanium Body
  • Built-In Temperature Sensor
  • Recessed, Flat Tip
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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 HI729113 uses general-purpose (GP) glass, flat tip bulb, titanium body, and PTFE junction with polymer electrolyte.

Porous ptfe junction

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 HI729113 is suitable to use with samples that measure from 0 to 80°C.

Porous ptfe junction

Flat Tip Bulb

The recessed flat tip bulb of the HI729113 is easy to clean and prevents solids in solutions from collecting on the sensor. Other tip shapes include conic for penetration and spheric for aqueous measurements.


titanium body

Titanium Body

A titanium body increases immunity to electrostatic and magnetic fields. It also allows for strong corrosion resistance, even in seawater.


titanium body

Matching Pin

A matching pin is a differential measurement technique used to eliminate ground loops and common mode perturbations for the measurement system. In a system without a matching pin, electrical currents in the sample can affect the reference half cell voltage that is connected via the liquid junction with the sample. In this case, the reference electrode picks up the electromagnetic fields and the measurement of the pH is altered. The matching pin isolates these current/magnetic fields from the reference electrode. The HI729113 titanium body serves as a matching pin for safe precise pH measurements.

Porous ptfe junction

PTFE Junction

Porous polytetrafluoroethylene (PTFE) is a hydrophobic material that is available with different porosities. This type of junction is often used on electrodes with polymer electrolytes. Because of its chemical advantages, PTFE is widely used in industrial applications.


Black Quick DIN Connector

Quick DIN Connector

The HI729113 uses a Quick DIN connector. This type of connector is generally proprietary to the meters they are supplied with and may not be interchangeable. The HI729113 is designed for use with Hanna’s HI99141 pH meter. Other types of connectors include BNC, screw type, T-type, and 3.5mm to name a few.



Single Junction Versus Double Junction pH Electrodes

Single junction vs double junction pH electrodes


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, leaQuick DINg 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 reaQuick DINgs 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 NameDetail
DescriptionpH electrode
Referencedouble, Ag/AgCl
Junction / Flow RatePTFE
Max Pressure3 bar
RangepH: 0 to 13
Recommended Operating Temperature0 to 80°C(32 to 176°F) – GP
Tip / Shapeflat
Temperature Sensoryes
Cable7-pole; 1 m (3.3’)
Recommended Usecooling towers, boilers
ConnectionQuick Connect DIN**
Special Note** Recommended for use with HI99141 pH meter