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The Model DCA-23 Seawater Dechlorination Analyser from Electro-Chemical Devices (ECD) is a low-maintenance measurement system suitable for use in process and municipal water-treatment applications.

Seawater has multiple process-industry uses, including heat-exchange systems at LNG terminals, oil/gas refineries, electric power plants and SWAC systems (salt-water air conditioning) in commercial buildings.

Seawater desalination plants also chlorinate and dechlorinate the water before processing.

The chlorination of seawater inhibits the growth of marine life on the various filters, screens and heat-exchanger surfaces, but the seawater must be dechlorinated for environmental reasons before it is discharged back into the original water supply.

The DCA-23 is a single-purpose analyser that monitors chlorine in seawater from 0.0-2.00ppm.

It features an economical, low-maintenance design that requires no chemicals.

It measures the pH, temperature and Total Residual Oxidant (TRO) of seawater and converts them into an equivalent ppm chlorine value, which is displayed to conform with existing conventions.

It features a minimum detection limit (MDL) of 0.014ppm and a limit of quantification (LOQ) of 0.044ppm, making the DCA-23 Analyser suitable for monitoring in environments with stringent dechlorination regulations.

The DCA-23 features three sensors: pH, TRO and temperature.

The pH sensor measures from 0-14pH, the TRO sensor measures from +/-1,500mV and the temperature sensor measures from 0-100C.

During the re-gasification process at LNG terminals, large quantities of chlorine-treated seawater are used to heat the LNG heat exchangers.

Seawater gradually raises the temperature of cold liquid natural gas changing it from a compressed fluid into a gas for distribution through the service pipelines.

Recycling the seawater requires dechlorination monitoring with the DCA-23.

Seawater cooling is employed at both thermal and nuclear power plants in coastal regions.

The seawater flows over heat exchangers and condenses the steam used to drive the turbines.

The cooling is accomplished with chlorinated seawater, which requires monitoring with the DCA-23 before discharge.

Similar heat exchange processes are utilised by oil/gas refineries.

In water desalination plants, seawater is treated by reverse osmosis (RO) to remove the salt.

The intake seawater is treated with chlorine to kill algae and other organisms prior to the RO process.

The RO membranes are degraded by chlorine so the chlorinated seawater must be dechlorinated by a device such as the DCA-23 before contacting the membranes.

The DCA-23 Seawater Dechlorination Analyser is available in five configurations: Loop powered; 24VDC powered; 24VCD powered; 110VAC powered; and 220 VAC powered.

The maximum system pressure and temperature rating is 50psig at 60C.

The DCA-23 Seawater Dechlorination Analyser is an easy-to-install plumb-and-play device when ordered as a complete Uni-Strut rack-mounted system and it is also available as separate components.

The rack-mounted system is plumbed with 3/4in schedule 80 pipe, with slip fittings for input and drain.

The T-23 Analyser, two sensors, pH flow cell and TRO flow cell are rack mounted using the Uni-Strut rail.

Electro-Chemical Devices

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