Remove another version before first start and your config will be used. My machine took too many hours to build the package so not my option.Ĭhecksums for the download are available, it is advisable to use them. This is a Userbuild so some trust is involved. I moved back to the portable version available from *CAL Check™ standards and testing reagents sold separately.The OBS builds of ungoogled chromium are lagging behind latest which is 1.75-1 HI96723 is supplied with two sample cuvettes with caps, 9V battery, instrument quality certificate, and instruction manual. Silicon Photocell with narrow band interference filter 525 nmĪfter ten minutes of non-use in measurement mode after one hour of non-use in calibration mode with last reading reminderĠ to 50☌ (32 to 122☏) RH max 95% non-condensing The reac- tion between chromium and the reagent causes a purple tint in the sample. As the change in color of the reacted sample increases, absorbance of the specific wavelength of light also increases, while transmittance decreases.Ĭhromium, Hexavalent High Range Portable Photometer - HI96723Īdaptation of the ASTM Manual of Water and Environmental Technology, D1687-92, diphenylcarbohydrazide method. For higher levels of chromium VI, a narrow band interference filter at 525 nm (green) allows only green light to be detected by the silicon photodetector and omits all other visible light emitted from the tungsten lamp. This principle states that light is absorbed by a complementary color, and the emitted radiation is dependent upon concentration. The associated color change is then colorimetrically analyzed according to the Beer-Lambert Law. When the diphenylcarbohydrazide reagent is added to samples containing chromium VI, the sample will turn a purple hue the greater the concentration, the deeper the color. The HI96723 uses an adaptation of the ASTM Manual of Water and Environmental Technology, D1687-92, diphenylcarbohydrazide method to measure chromium VI concentrations of less than 1000 µg/L (ppb). Due to its toxicity to humans, animals, and aquatic life, hexavalent chromium is actively monitored and neutralized in wastewater from the above industries. Hexavalent chromium salts are used in various industrial applications, such as in the manufacture of paints, dyes, explosives, and ceramics, and extensively in the metal finishing and plating industries. Units of measure - Appropriate unit of measure is displayed along with reading. Battery icon blinks when the capacity is less than 10 %. The instrument has a battery level indicator to display reaming life as follows: Prevents wastage of batteries in the event the meter is accidentally not turned off. This photometer has a cooling lamp indicator that is displayed for a short period of time before each measurement in order to allow the components to cool and obtain the highest accuracy possible.Įrror messages - Messages on display alerting to problems including no cap, over range and under range readings, and light source error.Īuto-shut off - Automatic shut off after 10 minutes of non-use when the meter is in measurement mode. This ensures that the cuvette is indexed consistently (same position) in order to maintain the same path length for accurate results.Ĭooling Lamp Indicator - It is necessary to maintain a consistent temperature of the optical components in order to maintain a narrow wavelength band of light. Indexing indent on meter - The meter has an indent that allows for a lock and key fit with the cuvette cap. This feature ensures consistency across multiple users. At the end of the timer countdown the meter will automatically take the reading. GLP - Records the date of the last user calibration performed.īuilt in timer - Allows the use of a timer to ensure the appropriate 3 minutes and 30 seconds reaction time is used for the chemical reaction. The exclusive cuvette locking system ensures that the cuvette is inserted into the measurement cell in the same position every time to maintain a consistent path length.ĬAL Check ™ - Allows for performance verification and calibration of the meter using a CAL Check NIST traceable secondary standard. The Hanna exclusive CAL Check ™ feature utilizes ready-made, NIST traceable standards to verify both meter validation and calibration. Hanna's portable photometers feature an advanced optical system the combination of a special tungsten lamp, a narrow band interference filter, and silicon photodetector ensure accurate photometric readings every time. The HI96723 portable photometer is for the measurement of chromium VI.
0 Comments
Leave a Reply. |