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The new Triton DO8 dissolved oxygen analyser system from Electro-Chemical Devices (ECD) has been developed for tough municipal and industrial water treatment environments.

Combining an advanced multi-channel digital controller with a fluorescence quenching (FQ) sensing element, the new analyser is said to be a reliable monitoring system solution for water treatment.

ECD’s C22 multi-channel controller/monitor integrated with the Triton DO8 sensor creates an accurate oxygen analysis system.

The C22 features a multi-bus architecture that allows up to four sensor inputs, six outputs and six relays.

The compact C22 is claimed to offer simple maintenance and a low cost of operation.

The low-maintenance Triton DO8 sensor couples precision FQ optical technology with microprocessor-based electronics.

The self-monitoring DO8 stores calibration data within the sensor, which minimises maintenance over long service intervals while providing stable, dependable DO measurement.

The Triton DO8 sensor features a maximum error rate of less than two per cent, repeatability of +/-0.5 per cent and a resolution of 0.01ppm or 0.01 per cent saturation.

It operates over a wide measurement range with three different outputs from 0mg/litre to 20mg/litre (0-20ppm), 0-200 per cent saturation or 0-500hPa (0-6psi).

The Triton DO8 sensor withstands ambient temperatures from -20C to +60C (0-140F) and records measurements at temperatures from -5C to +50C (20-120F).

It withstands pressures up to a maximum of 10bar (145psi).

An FQ method enables the Triton DO8 sensor to determine oxygen concentration in water.

A circular layer of optically active, oxygen-sensitive molecules is integrated into a replaceable cap.

This durable layer is permeable to oxygen and rapidly equilibrates to its surroundings.

The cap aligns the optically active fluorescence layer above two optical components – an emitter and a detector – inside the sensor.

After the sensor’s emitter flashes a green light at the layer, the layer fluoresces back a red light.

The duration and the intensity of the fluorescence are directly dependent on the amount of oxygen in the layer.

With little to no oxygen in the layer, the response is longer and more intense.

The presence of more oxygen, however, quenches (or reduces) the fluorescence effect.

The Triton DO8 sensor calculates dissolved oxygen values by continuously analysing the oxygen level, water temperature and air pressure.

Via digital communications, the DO8 sends DO data to ECD’s C-22 controller, which provides a 4-20mA output signal to a water treatment plant’s control room.

The RS-485 digital signal is nearly immune to common EMI/RFI noise, which is a problem in many plant environments.

The Triton DO8 has no membranes to replace, no electrolytes to refill and no anode/cathode assemblies to service or replace, making it lower maintenance than amperometric sensors, according to the company.

The only service required is the replacement of the DO8’s sensor cap, which lasts two years or longer, and the occasional wiping of the sensor head with a damp rag.

Electro-Chemical Devices

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