• Measuring range: 0 to 12 pH, Sample temperature range: -5 to 70 °C (23 to 158 °F), Sample pressure ≤0.1 bar; BNC connector

• Suitable for measurement of samples such as fats and creams, high-purity water, soil samples, drinking water, semi-solid products, low-conductivity solutions, emulsions, etc.

• When using a new electrode, first remove the protective cap from the top and inspect the entire electrode. If salt crystals are found on the electrode head and inside the protective cap due to evaporation of the internal electrolyte through the dialysis membrane, this does not affect normal use of the electrode and indicates that the electrode dialysis membrane is functioning properly; simply rinse it off with clean water. During transport, air bubbles may form inside the glass bulb of the electrode head. In this case, gently shake the electrode as you would a common mercury thermometer to remove the bubbles. If the glass sensing membrane or dialysis membrane head of the electrode is relatively dry, soak the electrode in HI70300 electrode storage solution for at least 1 hour to keep the dry glass sensing membrane and dialysis membrane moist; frequent soaking is beneficial to the electrode.

• Note: Do not use distilled water or deionized water to store or soak the electrode, as this will cause the electrode sensor to fail.

HI1053P features low-temperature (LT) glass, conical bulb, glass body, triple ceramic junction, refillable with 3.5M KCl.

Low-temperature glass formulation

Measuring pH at very high temperatures is harmful to sensitive glass bulbs and shortens their service life. pH electrodes with general-purpose (GP) glass have a resistance of 100 megohms at 25°C, while LT glass has a resistance of approximately 50 megohms at 25°C. As the glass temperature in the sample decreases, the resistance of LT glass approaches that of GP glass. If GP glass is used, the resistance will increase beyond the range, causing increased impedance and ultimately affecting the measurement. HI1053B is suitable for samples from -5 to 100°C.

Conical glass

The conical design allows penetration into solids, semi-solids, and emulsions for direct pH measurement in foods, including meat, cheese, yogurt, and milk.

Glass body

The glass body is ideal for laboratory use. The glass resists many harsh chemicals and is easy to clean. The glass body also allows heat to be transferred quickly to the internal reference electrolyte. The mV generated by the reference cell is temperature-dependent. The faster the equilibrium, the more stable the reference potential.

Triple ceramic junction

The triple ceramic junction allows electrolyte to flow from the reference into the solution more quickly.  A standard pH electrode uses a single ceramic junction, allowing an electrolyte flow of 15 to 20 μL/hour; the HI1053P has three ceramic junctions, providing an electrolyte flow of 40 to 50 μL/hour. This high flow rate provides faster electrode response and more stable measurement in viscous solutions or low-conductivity samples such as pure water, where long stabilization times are typically observed.

Double-junction reference

A double-junction electrode has an internal compartment around 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 contains no silver. 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 where silver precipitates at the junction are  highly oxidizing.

Refillable

The HI1053P is a refillable probe. Because it is a double-junction pH electrode, the filling solution is HI7082 3.5M KCl. This solution does not contain any silver as found in single-junction electrode filling solutions. The absence of silver will prevent any silver precipitates from forming at the junction and clogging it. A clogged junction will cause reading drift and instability.

BNC + pin connector

The HI1053P is equipped with BNC and pin connectors. The BNC connector is universal, as it can be used with any pH meter that has a female BNC probe input.  The pin connector is used to enable the CAL Check function on benchtop pH meters; HI122, HI123, HI221, HI222, HI223, HI2221, HI2222 and HI2223.