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 HI14143 uses low temperature (LT) glass, flat tip bulb, glass body, and open junction with viscolene gel electrolyte.
Low Temperature Glass Formulation
The glass tip uses a special LT glass formulation with a lower resistance of approximately 50 megaohms compared to general purpose (GP) with a resistance of about 100 megaohms. This is beneficial since many food products are stored at low temperatures. As the temperature of the glass decreases in the sample, the resistance of the LT glass will increase approaching that of GP glass at ambient temperatures. If using GP glass, the resistance would increase above the optimum resistance for the high impedance input of a pH meter.The HI14143 is suitable to use with samples that measure from 0 to 50°C.
Flat Glass Tip
A flat tip is recommended to optimize surface contact for measurement of leather and paper.
The glass body is ideal for laboratory use. The glass is resistant to many harsh chemicals and is easily cleaned. The glass body also allows for a fast transfer of heat to the internal reference electrolyte. The mV generated by the reference cell is temperature dependent. The faster the electrode reaches equilibrium, the steadier the reference potential.
Open Junction Reference
Suspended solids and proteins found in food products will clog a conventional ceramic reference junction. This clogging will impede the measurement circuit between the indicating electrode and the internal reference resulting in slower response time, erratic readings, and frequent electrode replacement. The open junction design consists of a solid gel interface (viscolene) between the sample and internal Ag/AgCl reference. This interface not only prevents silver from entering the sample, but also makes it impermeable to clogging, resulting in a fast response and stable readings.
The HI14143 uses a quick connect DIN connector. This type of connector is made for Hanna meters that accept a quick connect DIN connector. The HI14143 is recommended for the HI99171 pH meter. Other type of connectors include BNC, screw type, T-type, and 3.5mm to name a few.
Reference Cell Type single, Ag/AgCl Junction Type/Flow Rate open Type of Electrolyte viscolene Body Material glass Glass Type low temperature (LT) Tip / Shape flat Matching Pin no Max. Pressure 0.1 bar Optimum pH Range pH: 0 to 12 Temperature Operating Range 0 to 50°C (32 to 122°F) Body Length/Overall Length 110 mm / 153.5 mm Temperature Sensor yes Outer Diameter 12 mm Cable 7-pole; 1 m (3.3') Connector Type quick connect DIN connector Amplifier yes Recommended Use pulp, paper, and surface measurements