Analyzer AZHT 94/4
The company's most sought-after product is the AZhT-94 turbidimetric analyzer—specifically, its fourth modification, which features various cuvettes for measuring turbidity across ranges of 0.2–35 mg/L, 0.3–50 mg/L, 0.4–75 mg/L, and 1–220 mg/L (see Figs. 1 and 2). Optical fouling has been reduced threefold thanks to a new cuvette design, and cleaning is performed via a built-in, automatically driven mechanism. This analyzer model is suitable for water temperatures of 1–45°C, while the AZhT-94/4-VT variant (also equipped with a cleaning mechanism) operates at temperatures up to +55°C.
The latest type approval certificate (RU.C. 31.005.A No. 58867) is registered in the State Register of Measuring Instruments under No. 60758-15 (dated May 27, 2015) and is valid until 2030.
Industrial trials of the initial AZhT-94/4 units demonstrated that, with a 30-minute interval between cleanings, the measurement error caused by optical fouling from intake (river) water does not exceed 0.5% at a turbidity level of approximately 15 mg/L (silt, organic matter). Measurements taken with the AZhT-94/4 are highly representative: a vertical sample column (150 mm in height and 13 mm in diameter) is illuminated simultaneously—representing a volume of 15 cm³, compared to less than 2 cm³ in nephelometers. The new transparent cuvette allows for visual monitoring of the sample flow and wall siltation, and is highly convenient to operate. Verification of the 100% transmittance level is performed using air, while the conversion slope can be adequately checked using a certified turbidity reference standard at one or two points within the mid-range of the measurement scale. This eliminates the need to flush the flow-through cell until it reaches the cleanliness level of distilled water—a crucial advantage, given that achieving such a state is impossible under actual operating conditions.
For the AZhT-94/4, an optional pressure regulator is available to stabilize the flow rate through the cell (0.6–1.5 L/min), along with a chamber for removing fine and micro-sized gas bubbles.
The latest type approval certificate (RU.C. 31.005.A No. 58867) is registered in the State Register of Measuring Instruments under No. 60758-15 (dated May 27, 2015) and is valid until 2030.
Industrial trials of the initial AZhT-94/4 units demonstrated that, with a 30-minute interval between cleanings, the measurement error caused by optical fouling from intake (river) water does not exceed 0.5% at a turbidity level of approximately 15 mg/L (silt, organic matter). Measurements taken with the AZhT-94/4 are highly representative: a vertical sample column (150 mm in height and 13 mm in diameter) is illuminated simultaneously—representing a volume of 15 cm³, compared to less than 2 cm³ in nephelometers. The new transparent cuvette allows for visual monitoring of the sample flow and wall siltation, and is highly convenient to operate. Verification of the 100% transmittance level is performed using air, while the conversion slope can be adequately checked using a certified turbidity reference standard at one or two points within the mid-range of the measurement scale. This eliminates the need to flush the flow-through cell until it reaches the cleanliness level of distilled water—a crucial advantage, given that achieving such a state is impossible under actual operating conditions.
For the AZhT-94/4, an optional pressure regulator is available to stabilize the flow rate through the cell (0.6–1.5 L/min), along with a chamber for removing fine and micro-sized gas bubbles.
The AZhT-94/4 analyzer can also function as an in-line photocolorimeter operating at a specific wavelength (280–800 nm) to measure the concentration of substances dissolved in water. To enable this, a simple mechanical filter—such as one from a drinking water purification system—is installed upstream of the analyzer. Within its measurement ranges, the AZhT-94 analyzer is fully comparable to Western-made equivalents.
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