Advanced portable photometer for the measurement of chromium (VI) in water. This meter offers a superior optical system that utilizes a reference detector and narrow band interference filters for extremely fast and repeatable measurements.

• No warm up time before taking a measurement
• Tutorial mode for step-by-step instructions
• CAL Check to verify meter performance

This photometer uses an adaptation of the ASTM Manual of Water and Environmental Technology, D1687-92, diphenylcarbohydrazide method to measure chromium VI concentrations up to 1000 μg/L (ppb). 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 associated color change is then colorimetrically analyzed according to the Beer-Lambert Law. This principle states that light is absorbed by a complementary color, and the emitted radiation is dependent upon concentration. For higher levels of chromium VI, a narrow band interference filter at 525 nm allows only green light to be emitted and passed through the sample cuvette. As the change in color of the reacted sample increases, absorbance of the specific wavelength of light also increases, while transmittance decreases.

• Chromium, Hexavalent range: 0 to 1000 μg/L (as Cr(VI))
• Chromium, Hexavalent resolution: 1 μg/L
• Chromium, Hexavalent accuracy: ±5 μg/L ±4% of reading at 25°C
• Silicon photocell
• Bandpass filter bandwidth: 8 nm
• Bandpass filter wavelength accuracy: ±1.0 nm
• Cuvette type: round, 24.6 mm diameter (22 mm inside)
• 128 x 64 pixel B/W LCD with backlight display
• Logging memory: 50 readings
• 1.5 V AA Alkaline (3 pcs.) / > 800 measurements (without backlight)
• Automatic shut-off after 15 minutes of inactivity (30 minutes before a READ measurement)
• Dimensions: 5.6" x 4.0" x 2.0"