Pyxis Lab VoluCheck PTSA System Volume Verification Kits

Overview

PTSA is a colorless fluorescent dye that has been widely used for the determination of water volume for open and closed recirculating systems. The Pyxis Lab® VoluCheck PTSA System Volume Verification Kit includes a laminated calculation instruction sheet. As well as a quantity 10 – 0.45 micron syringe filters. VoluCheck Application Details The PTSA volume verification method is suitable in most recirculating water systems. Furthermore, closed systems treated with high levels of nitrite (>500 ppm) or containing high level suspended solids (>100 NTU) should be pre-flushed before using the PTSA sizing method to accurately determine the system volume. Basically, these elevated levels can interfere with the PTSA measurement. System flushing until nitrite residual is below 100ppm or turbidity is below 40 NTU is recommended. The SP-350 can be used to check if the water is suitable for the method. Procedure Use the SP-350 to measure the PTSA background. Fill the SP-350 sample cell with the system water. Record the initial background reading as ppb PTSA. If the system water is heavily colored or turbid, filter the water with the 0.45 micron syringe filter. Make a rough estimate of the system volume range to determine which PTSA solution bottle should be added according to information in the specifications table. Add the first full bottle from your VoluCheck kit to the system. Let the system recirculate and mix for 30 minutes (if the system recirculation rate is low and has many stagnant areas, allow longer mixing time). If necessary, add second or more full bottles to achieve the ideal target PTSA concentration in the range of 80 to 260 ppb. Record the total PTSA solution added in Ounces (oz.) and the final PTSA concentration.Calculate system volume by below. VoluCheck 1K Kit Formula Volume (US Gallons) = (Ounces Added x 50,000) / (PTSA in pub Final – PTSA ppb Background) VoluCheck 10K Kit Formula Volume (US Gallons) = (Ounces Added x 250,000) / (PTSA in pub Final – PTSA ppb Background) VoluCheck 100K Kit Formula Volume (US Gallons) = (Ounces Added x 625,000) / (PTSA in pub Final – PTSA ppb Background) Use with our SP-350 SP-710

Specifications

Documentation

Specifications reproduced from the manufacturer's published product information (pyxis-lab.com), retrieved 18 August 2026. Pyxis Lab is a trademark of its owner. Confirm all specifications with ForeverPure before purchase.