Liquid Analytical Systems

Liquid analytical systems are the transmitters and complete analyzers that turn a sensor signal or a wet-chemistry measurement into a value the control room can use. This category covers conductivity, pH and dissolved oxygen transmitters, online analyzers for silica, sodium, hydrazine, fluoride and total organic carbon, turbidity and oil-in-water monitors, and laboratory titrators. The main brands are ABB, Hach, Sitelab, Galvanic and Endress+Hauser. Seven Star LLC supplies these industrial liquid analyzers to plants in Oman and the GCC.

Types of liquid analyzer listed

• Transmitters: single, dual and multi-channel units for conductivity, pH/ORP and dissolved oxygen sensors, from ABB, Endress+Hauser and Yokogawa.
• Online water analyzers for silica, sodium, hydrazine and fluoride from ABB and Hach.
• Online TOC analyzers from Hach and Forbes Marshall.
• Turbidity, suspended solids, color and oil-in-water monitors from Galvanic.
• Sitelab UV fluorescence instruments for TPH and oil fingerprinting.
• Metrohm titrators and process analyzers, a BARTEC salt in crude analyzer, and units from AppliTek and ProMinent.

Selecting a liquid analyzer system

Begin with the parameter and the range, then describe the sample. Temperature, pressure, solids, oil and air bubbles at the sample point decide how much sample preparation an online analyzer needs: cooling, pressure reduction, filtration or degassing. Wet-chemistry analyzers work in cycles and need reagents, a drain and regular attention, so the number of streams, the cycle time and the reagent consumption belong in the comparison. Transmitters are simpler. The questions there are which sensors they accept, how many channels are needed and which outputs the control system expects, typically 4-20 mA with HART, Modbus or PROFIBUS. In classified areas the analyzer needs a suitable Ex version or a purged enclosure.

What to send for a quotation

Send the parameter, range and required detection limit, the sample composition, temperature and pressure, the number of sample streams, outputs, power supply, ambient conditions and area classification. For a replacement, add the model code and serial number of the existing unit. We check the configuration against the manufacturer documentation, propose the manufacturer’s successor for obsolete models, and provide datasheets and manufacturer certificates on request.