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HACH ULR

HACH ULR (Ultra-Low Range) is a product line from Hach, a brand established in 1947 and headquartered in Loveland, Colorado, USA, known for water analysis instrumentation and chemistries. The ULR series focuses on fluorescence-based test kits designed for detecting trace-level contaminants in water, specifically targeting sulfite and chlorine species at concentrations in the parts-per-billion (µg/L) range. These kits are used in applications where standard colorimetric methods lack sensitivity, such as monitoring boiler feedwater, condensate return, and high-purity process water in power generation, chemical processing, and semiconductor manufacturing. The kits employ a fluorescence quenching principle, which provides a direct measurement without the need for sample dilution or complex sample preparation, reducing potential errors from handling. Each kit includes pre-measured reagents, a vial stand, and instructions for use with a compatible fluorometer (sold separately). The sulfite test kit covers a range of 6 to 500 µg/L SO₃, while the free chlorine kit spans 2 to 100 µg/L Cl₂, and the total chlorine kit covers 3 to 100 µg/L Cl₂. All kits are supplied as 100-test packages, with reagents in sealed bottles to maintain stability. The test parameters are specific to each kit, and the fluorescence method is less susceptible to interferences from turbidity or color compared to traditional DPD methods. 3G Electric stocks multiple SKUs from the HACH ULR line, including the sulfite, free chlorine, and total chlorine kits, and provides datasheets and logistics support for global procurement. These kits are suitable for field or laboratory use, with a typical analysis time of under 5 minutes per test. The fluorescence method is EPA-approved for certain applications, though users should verify compliance with local regulations. The kits are designed for single-use, disposable reagents, minimizing cross-contamination risks. For engineers and maintenance managers requiring precise low-level monitoring, the HACH ULR series offers a reliable, standardized approach without the need for extensive training or specialized equipment beyond a fluorometer.

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About HACH ULR

HACH ULR (Ultra-Low Range) is a product line from Hach, a brand established in 1947 and headquartered in Loveland, Colorado, USA, known for water analysis instrumentation and chemistries. The ULR series focuses on fluorescence-based test kits designed for detecting trace-level contaminants in water, specifically targeting sulfite and chlorine species at concentrations in the parts-per-billion (µg/L) range. These kits are used in applications where standard colorimetric methods lack sensitivity, such as monitoring boiler feedwater, condensate return, and high-purity process water in power generation, chemical processing, and semiconductor manufacturing. The kits employ a fluorescence quenching principle, which provides a direct measurement without the need for sample dilution or complex sample preparation, reducing potential errors from handling. Each kit includes pre-measured reagents, a vial stand, and instructions for use with a compatible fluorometer (sold separately). The sulfite test kit covers a range of 6 to 500 µg/L SO₃, while the free chlorine kit spans 2 to 100 µg/L Cl₂, and the total chlorine kit covers 3 to 100 µg/L Cl₂. All kits are supplied as 100-test packages, with reagents in sealed bottles to maintain stability. The test parameters are specific to each kit, and the fluorescence method is less susceptible to interferences from turbidity or color compared to traditional DPD methods. 3G Electric stocks multiple SKUs from the HACH ULR line, including the sulfite, free chlorine, and total chlorine kits, and provides datasheets and logistics support for global procurement. These kits are suitable for field or laboratory use, with a typical analysis time of under 5 minutes per test. The fluorescence method is EPA-approved for certain applications, though users should verify compliance with local regulations. The kits are designed for single-use, disposable reagents, minimizing cross-contamination risks. For engineers and maintenance managers requiring precise low-level monitoring, the HACH ULR series offers a reliable, standardized approach without the need for extensive training or specialized equipment beyond a fluorometer.

Common Applications

  • Power generation — HACH ULR Sulfite Test Kit for monitoring oxygen scavenger residuals in boiler feedwater
  • Semiconductor manufacturing — HACH ULR Free Chlorine Test Kit for trace chlorine control in ultrapure water systems
  • Chemical processing — HACH ULR Total Chlorine Test Kit for verifying chlorine removal in process water
  • Pharmaceutical production — HACH ULR Sulfite Test Kit for ensuring low sulfite levels in water-for-injection systems
  • Food and beverage — HACH ULR Free Chlorine Test Kit for rinse water monitoring in bottling plants
  • Municipal water treatment — HACH ULR Total Chlorine Test Kit for low-level disinfection residual checks in distribution systems

Frequently asked questions

Common questions about HACH ULR from 3G Electric.

What is the detection principle of HACH ULR test kits?

HACH ULR test kits use a fluorescence quenching method. The reagent reacts with the target analyte (sulfite or chlorine), causing a change in fluorescence intensity proportional to the concentration. This is measured with a fluorometer, providing direct readings in µg/L without dilution. The method is specific and less affected by sample color or turbidity than colorimetric tests.

What is the shelf life of HACH ULR reagents?

HACH ULR reagents typically have a shelf life of 12 to 24 months from the date of manufacture when stored in a cool, dry place (15–25°C) and away from direct sunlight. Each kit includes expiration dates on the reagent bottles. 3G Electric recommends checking the lot number and expiration upon receipt to ensure optimal performance.

Can HACH ULR kits be used with any fluorometer?

HACH ULR kits are designed for use with Hach fluorometers, such as the DR 3900 or specific ULR fluorometer models. The kits include calibration standards and protocols tailored to Hach instruments. Using non-Hach fluorometers may require validation of the method and calibration curve, as fluorescence response can vary between instruments.

What is the difference between free chlorine and total chlorine HACH ULR kits?

The free chlorine kit (SKU 908RF1) measures only free chlorine (hypochlorous acid and hypochlorite ion) in the range 2–100 µg/L Cl₂. The total chlorine kit (SKU 908RF2) measures combined chlorine (chloramines) plus free chlorine, with a range of 3–100 µg/L Cl₂. Both use fluorescence but with different reagents. The sulfite kit (SKU 908RF0) is a separate parameter for sulfite detection.

How many tests are in a HACH ULR kit, and what is included?

Each HACH ULR kit contains 100 tests. The package includes pre-measured reagent bottles (typically 2 bottles for free chlorine, 1 for sulfite and total chlorine), a vial stand, and an instruction manual. The fluorometer and sample vials are not included and must be purchased separately. The reagents are sufficient for 100 individual measurements.

What are typical applications for HACH ULR sulfite test kits?

HACH ULR sulfite kits are used to monitor sulfite residuals in boiler feedwater and condensate to prevent corrosion from oxygen scavenging. They are also applied in industrial water treatment where low-level sulfite control is critical, such as in power plants and chemical processing. The ultra-low range (6–500 µg/L) allows detection of trace sulfite that standard methods miss.