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New peracetic acid analyser helps maintain disinfection without harmful by-products

Liquid measurement expert Electro-Chemical Devices (ECD), based in Anaheim, California, has introduced the new panel mounted PA80 peracetic analyser for disinfection duties.

The new analyser simplifies process monitoring to ensure disinfection without the need for potentially harmful disinfection by-products (DPBs).

The plumb-and-play design of PA80 allows a single technician to install the unit right out of the box with no special tools or complex calibration routines.

Ready to go from the factory, the PA80’s design includes built-in flow control, eliminating the need to purchase or install pressure regulators and rotameters, which are typically an extra cost with many other types of liquid analysers.

Peracetic acid (PAA) is a colourless liquid with a characteristic pungent odour similar to vinegar, which is produced by a reaction between hydrogen peroxide and acetic acid.

Produced typically as an equilibrium solution combining these agents, PAA is supplied in concentrations of 5 to 15% and it is a powerful oxidiser, stronger than either chlorine or chlorine dioxide.

The food and beverage, medical, and pharmaceutical industries all rely on PAA as a cleaner and sanitiser of process equipment, medical instruments, and for bottle washing, and it is also used as a disinfectant in municipal wastewater treatment and industrial cooling towers.

The ECD PA80 features multiple PAA measurement ranges between 0-2000ppm, which allows plant engineers to select the monitoring range that best fits the requirements of their product batch recipes, processes, and equipment cleaning requirements.

The PA80’s design incorporates a constant head flow control device, a pH sensor, a PAA sensor, and ECD’s T80 analyser/transmitter, all mounted on a PVC panel.

The transmitter is 110-240VAC- or 24VDC-powered and allows either parameter to be graphically displayed with user defined line, bar, or gauge style graphs.

The standard configuration has two 4-20mA outputs, three alarm relays, and an industry standard Modbus remote terminal unit.

Relying on precision amperometric PAA sensors that are flow sensitive, the PA80 provides accurate measurement with a minimum flow rate past the sensor of 0.5ft/s, above which the output is virtually flow independent.

The PA80’s constant head flow control device (CFD) maintains the optimum flow past the sensor over a wide range of incoming sample flow rates.

The minimum flow required for the CFD is 10gal/h, and the maximum flow rate is 80gal/h with the sample draining at atmospheric pressure.

To reduce maintenance technician time and costs, the PA80 features an optional auto-clean configuration, which includes a solenoid actuated spray cleaner that uses either 30psi process water or air.