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Refillable Combination ORP Electrode with BNC Connector Hanna Instruments HI3131B

Product Information

Manufacturer: Hanna Instruments
Model: HI3131B
Warranty: 12 months

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Description

The HI3131B is a glass body, refillable, single junction ORP electrode with a BNC connector. This electrode has a single ceramic junction as part of the reference cell and a platinum ORP sensing pin.
This design consideration is ideal for laboratories and general purpose ORP measurements, as well as for use as an indicating electrode in ORP titrations.

refillable electrode

Refillable Electrode

Double Reference Junction

Single Ceramic Junction

Platinum Sensing Pin

Platinum Pin
Hanna Instruments offers a wide variety of ORP electrodes that are designed for many different applications. The type of material used for the sensing pin, type of glass used for body material, type of junction, type of reference and electrolyte used are just some of the design considerations.
The HI3131B uses a platinum pin, glass body, single ceramic junction and is refillable with 3.5M KCl + AgCl.
Platinum Sensing Pin
The HI3131B ORP sensor is made with platinum. An ORP sensor must be chemically inert; it cannot be oxidized or reduced itself. It must also have the proper surface characteristics to promote rapid electron exchange, a property known as high exchange current density. Two noble metals have proven to work well for this purpose: pure platinum and pure gold are both used in the construction of ORP sensors. The platinum sensor is often preferred because it is mechanically simpler and safer to produce. Platinum can be welded to glass and has the same thermal coefficient. The platinum sensor signal is carried through the electrode body, and together with the reference signal is conducted to the measurement meter.
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 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 equilibrium the steadier the reference potential.
Single Ceramic Junction
The outer junction of an electrode, 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
The HI3131B is a refillable probe. Since it is a single junction ORP electrode the fill solution is the HI7071 3.5M KCl + AgCl. If using a refillable ORP electrode, the fill cap should be removed prior to 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 HI3131B 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. These types of connectors tend to be proprietary for a particular type of meter and are not interchangeable.

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Thông số kỹ thuật

ORP Sensing Type	Platinum
Measurement Range	ORP: ±2000 mV
Reference Cell Type	single, Ag/AgCl
Junction Type/Flow Rate	ceramic, single / 15-20 μL/h
Refill Electrolyte	3.5M KCl + AgCl
Body Material	glass
Tip / Shape	platinum pin
Matching Pin	no
Max. Pressure	0.1 bar
Temperature Operating Range	-5 to 70°C (23 to 158°F)
Body Length/Overall Length	150 mm / 205.5 mm
Temperature Sensor	no
Outer Diameter	12 mm
Cable	coaxial; 1 m (3.3’)
Connector Type	BNC
Amplifier	no
Recommended Use	general purpose, laboratory general purpose, ORP titrations