Glass Body ORP Electrode with DIN Connector - HI3618D

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Glass Body ORP Electrode with DIN Connector - HI3618D

$160.00

The HI3618D is a glass body, refillable, single junction ORP electrode with a DIN connector. This electrode has a single ceramic junction in the outer reference cell and the ORP sensing pin is made with platinum.


This design consideration is ideal for laboratories and general purpose ORP measurements.


temperature sensor


Built-In Temperature Sensor


 


refillable electrode


Refillable Electrode


 


platinum sensing pin


Platinum Sensing Pin

Details

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 HI3618D uses a platinum pin, glass body, single ceramic junction and is refillable with 3.5M KCl + AgCl. 

Platinum Pin

Platinum Sensing Pin

The HI3618D 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

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 electrode reaches equilibrium, the steadier the reference potential.

 

Ceramic Junction

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

Refillable

The HI3618B 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.

 

DIN connector

 DIN Connector

The HI3618D uses a DIN connector. This type of connector is generally proprietary to the meters they are supplied with and may not be interchangeable. Other type of connectors include BNC, screw type, T-type, and 3.5mm to name a few. The HI3618D ORP probe is used witht eh HI8314 portable meter.

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 120 mm / 175.5 mm
Temperature Sensor yes
Outer Diameter 12 mm
Cable 5-pole; 1 m (3.3')
Connector Type DIN
Amplifier yes
Recommended Use laboratory general purpose

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