Portable meters are available with probes that use either the Clarke-Type Polarographic, Galvanic, or Optical technologies. The portable meters include those with manual calibration and manual selection of altitude and salinity compensation values. Portable meters also include versions that have a barometric pressure transducer for automatic pressure compensation along with versions that have an EC sensor for salinity compensation. Meters are available with the BOD, OUR and SOUR programs built-in for automatic calculation.
Benchtop meters are available with Clark-Type Polarographic Probes. Benchtop meters are available with manual entry of salinity and altitude for compensated measurement. Meters are also available to perform BOD (Biochemical Oxygen Demand), OUR (Oxygen Uptake Rate), and SOUR (Specific Oxygen Uptake Rate). Parameters including bottle volume and seed are used to calculate the BOD based on two measurements taken 5 days apart.
Electrodes & Probes
The following are replacement probes and sensors for benchtops and portable meters that can measure dissolved oxygen.
Solutions for probe style measurements include fill solutions for polarographic and galvanic probes. In this category is zero oxygen solution for calibrating meters to 0 mg/L (ppm).
The solution category also include the CAL Check standards for verifying portable and benchtop photometers. Each CAL Check standard is supplied with a Certificate of Analysis stating the accuracy and traceability of the standard
Spectrophotometers are available that have a dissolved oxygen method pre-programmed into the meter. The spectrophotometer also has oxygen scavenger methods built in for boiler maintenance. The spectrophotometer offers the highest precision due to the quality of the optical system that has a wavelength accuracy of +/- 1.5 nm. The spectrophotometer allows for custom methods.
Benchtop photometers include multiparameter versions for water quality, wastewater and Environmental. Each photometer is customized to have the parameters used by a specific industry. Some models, like the version for boilers and cooling towers, include the oxygen scavenger methods. All benchtop have a digital pH electrode input allowing it to be used as a traditional pH meter.
A portable photometer is available for measuring dissolved oxygen.
Chemical Test Kits
A dissolved-oxygen chemical test kit (CTK) is available as a single parameter or available with multiparameter CTKs. The dissolved-oxygen CTK uses a modified Winkler titration method. All accessories are included with the CTK to measure dissolved-oxygen.
Reagents include the reagents used with the photometers and chemical test kit to measure dissolved oxygen. Also included in this category are the oxygen scavenger reagents.
Accessories include cuvette cleaning solution, microfiber cloths, and replacement cuvettes and caps for photometers. Also included are accessories for the meters that use probes.
Process controllers are available for the continuous monitoring of solutions. Process controllers include a programmable set point that can activate a relay connected to a solenoid valve, dosing pump, or other device to make adjustments to a process. The process controllers offer a analog output for connection to a remote device such as SCADA, PLC or other compatible devices.