FC220B

Description

The FC220B is a glass body, single junction pH electrode that has a BNC connector. The FC220B electrode features a triple ceramic junction with refillable electrolyte, a sensing bulb made of low temperature glass, and a spherical tip shape.This design consideration is ideal for pH measurements in products such as creams, sauces, or fruit juice samples. The recommended operating temperature range is from -5 to 70°C.

•  Low Temperature Glass
•  Refillable Electrode
•  Triple Ceramic Junction

The FC220B uses low temperature (LT) glass, spherical bulb, glass body, triple ceramic junction and is refillable with 3.5M KCl + AgCl.
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 FC220B is suitable to use with samples that measure from 0 to 50^°C.

  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
•  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.

Triple Ceramic Junction
•  The triple ceramic junction allows a higher flow rate of electrolyte from the reference cell into the measurement sample.
•  A typical pH electrode will have a single ceramic junction that flow rate of 15 to 20 µL/hour.
•  The FC220B has three ceramic junctions in contact with the sample providing for a flow rate of 40 to 50 µL/hour.
•  The increased flow provides a greater continuity between the reference electrode and the indicating electrode, making it suitable for viscous solutions or
samples of low conductivity, such as pure water.

  Refillable
•  The FC220B is a refillable probe. Since it is a single junction pH electrode the fill solution is the HI7071 3.5M KCl + AgCl.
•  If using a refillable pH electrode, the fill cap should be removed prior to calibration and measurement.
•  Removing the cap creates positive head pressure in the reference cell allowing for higher flow rate of electrolyte through the outer junction.
•  A higher flow rate will result in a faster and more stable reading.

BNC Connector
•  The FC220B uses a BNC connector.
•  This type of connector is universal in that it can be used on any pH meter that has the female BNC probe input.
•  Other type of connectors include DIN, screw type, T-type, and 3.5mm to name a few.

     SPECIFICATIONS