The HI900602 photometric electrode has a red LED with a wavelength of 625 nm as a light source. This wavelength of light is useful for determining a purple endpoint when using indicators such as p-naphtholbenzein or calconcarboxylic acid during a volumetric titration. The HI900602 can be used for a variety of applications, including measuring the:
- Total acid number (TAN) of petroleum products,
- Concentration of barium, calcium, magnesium, lead, or zinc in unused lubricating oils,
- Concentration of iron, calcium, magnesium, or aluminum in cement,
- Calcium hardness, magnesium hardness, or total hardness of water, or
- Concentration of chondroitin sulfate, manganese sulfate, or zinc sulfate to USP and Ph. Eur. standards.
LED at 625 nm
HI900602 uses a LED that emits light at 625 nm (red color). This high quality LED will provide long term use since it takes thousands of hours for the LED intensity to dim naturally.
The HI900602 contains a glass flow through cell, which the sample fills. The LED shines light at 625 nm through the sample, which is reflected back by a platinum mirror sealed in the glass tip of the probe. The fixed path length of the reflective measurement allows for high color sensitivity in a compact design.
Automatic Temperature Compensation
All readings are compensated for the changes in temperature of the sample from 0 to 75℃ (32 to 167℉) to provide for accurate and repeatable measurements.
HI900602 probe has a glass-body that offers excellent chemical resistance against organic solvents. These solvents can be found in samples and can attack different forms of plastics.
The electronics of the probe are located in a steel shielding, which is covered by the glass-body. The steel sheilding of the probe also blocks out ambient light and protects against electronic interference.
12 mm Diameter Probe Body
HI900602 has a probe diameter of 12 mm (1/2″), which is the standard size for most pH/ORP electrodes. The 12 mm probe will fit in most electrode holders.
HI900602 has a BNC connector for connecting a pH/mV input of a meter. The mV range for the probe is from 10 to 1100 mV.
PS/2 Mini-DIN Connector
A PS/2 connector is used for supply power to the probe. The HI931and HI932 potentiometric titration systems have a ps/2 power output for the probe to be connected to. The HI900932 is a PS/2 Y-splitter that is also available and allows for multiple probes to use one power source.
LED Calibration Trimmer
Although the LED provides a very long life, it does slowly dim over time. A trimmer located in the head of the probe can be used to adjust the output intensity. This allows the probe to be recalibrated, ensuring accurate measurements. The probe is placed in DI or distilled water and the trimmer adjusted until 1000 mV (100% transmittance) is displayed.