Emerson Process Management 430 DO Section General Description and Specifications

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MODEL 430 DO

SECTION 1.0

 

DESCRIPTION AND SPECIFICATIONS

SECTION 1.0

GENERAL DESCRIPTION AND SPECIFICATIONS

•LARGE ELECTROLYTE RESERVOIR allows up to twelve months and often longer between refills.

•OPTIONAL MOUNTING BRACKET allows easy removal of the sensor from an aeration basin without the use of tools.

•MODULAR PRESSURE COMPENSATOR AND MEMBRANE RETAINER simplify recharg- ing and membrane replacement.

•MEMBRANE RETAINER REPLACEMENT AND RECHARGING require no tools.

1.1 FEATURES AND APPLICATIONS

The Rosemount Analytical® Model 430 Dissolved Oxygen Sensor, used with the Model 1181 Dissolved Oxygen Transmitter, measures oxygen levels in a vari- ety of applications. The most widely used application is the secondary phase of the waste treatment process where a critical dissolved oxygen level must be main- tained for the digestive process to occur. Other appli- cations include water quality monitoring in natural bod- ies of water such as rivers and streams, or any location where adequate oxygen content is important to sustain aquatic life.

The Model 430 Dissolved Oxygen Sensor is construct- ed of PVC with an oxygen permeable Teflon1 mem- brane .

1.2 OPERATION

As oxygen passes through the Teflon membrane an oxygen dependent electrochemical reaction takes place between the gold cathode and silver anode in the presence of the electrolyte. The resultant current flow between these elements is proportional to the quantity of oxygen which has entered the sensor.

Temperature and pressure compensation are both standard features on the Model 430. Temperature com- pensation is necessary for two reasons: First, the solu- bility of oxygen in water decreases with an increase in temperature; secondly, the permeability of the Teflon membrane and the oxygen diffusion rate increase as the temperature increases. For these reasons, it is

important for a dissolved oxygen measurement to be accompanied by an accurate temperature measure- ment. Temperature compensation is accomplished by means of a thermistor located in the sensor housing, and its associated circuitry in the analyzer.

Pressure compensation is a mechanical rather than electronic correction. It is important for the tension on the Teflon membrane to remain constant at all times, even with sample pressure changes. Fluctuations in membrane tension affect its diffusion characteristics. By means of a pressure compensator the pressure on the sample side of the compensator membrane is transmitted to the electrolyte reservoir so the pressure on both sides of the membrane remains equal. In this manner, sample pressure changes do not affect the dif- fusion rate of oxygen through the membrane.

The Teflon membrane is held in place by a retainer. A water-tight seal is made with an O-ring between the membrane and sensor reservoir. Membrane replace- ment is rarely required, but in those situations when it is necessary, the procedure can be performed quickly and easily.

Since oxygen diffuses through the Teflon membrane at a faster rate than through the sample, it is necessary to continuously maintain a fresh sample in front of the membrane. A stream velocity of approximately 1.5 feet per second (0.5 m/s) is required to ensure that a fresh sample is in contact with the membrane at all times.

1 Reg. U.S. Pat. Office for du Pont’s fluorocarbon resins.

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Contents Dissolved Oxygen Sensor Essential Instructions Hazardous Area InstallationModel Dissolved Oxygen Table of ContentsList of Tables Table of Contents List of FiguresFeatures and Applications Section General Description and SpecificationsWetted Materials Housing PVC Membrane Teflon Specifications Process ConnectionTemperature Compensation 40043019Optional Mounting Bracket 40043018Model Electrode Connections Sensor Lead Model 1181DO Section Installation40043001 Codes and 01 and 02 Flow Through Installation40043002 Code 03 Sensor DimensionsPage Do not Remove IT Section MaintenanceTemperature Resistance Chart Section Troubleshooting40045052 Section Parts ListsPart Number Description Qty 4004301640043015 40043017 Section Return of Material NON Warranty REPAIR. Contact Factory For AuthorizationASIA-PACIFIC Americas HeadquartersEUROPE, Middle EAST, and Africa Additional Sales OfficesSensor or Circuit Board only Return of Materials RequestPage Warranty Specifications subject to change without notice

430 DO specifications

Emerson Process Management has long been a pioneer in the field of automation and instrumentation, and one of its standout products is the 430 DO, a digital output module widely used in various industrial applications. The 430 DO is engineered to facilitate increased efficiency, reliability, and flexibility in process management systems.

One of the main features of the 430 DO is its ability to support a range of output configurations. It typically offers multiple channels, allowing operators to control various field devices simultaneously. This high-density output capability makes it ideal for applications where space and resources are constrained.

The module utilizes advanced digital signal processing technology, which enhances its performance and responsiveness. This technology ensures that the 430 DO can handle robust signal processing, leading to improved speed and accuracy in control processes. Moreover, the module complies with the industry standards for electromagnetic compatibility (EMC), ensuring minimal interference and enhanced operational integrity in diverse environments.

In terms of connectivity, the 430 DO is designed to integrate seamlessly within Emerson's DeltaV™ control system, enabling quick deployment and straightforward configuration. The use of an intuitive interface simplifies setup and allows operators to quickly adapt to changing process requirements. Additionally, the module supports extensive communication protocols, which facilitates interoperability with various devices and systems, enhancing overall operational versatility.

Another notable characteristic of the 430 DO is its built-in diagnostic capabilities. Real-time monitoring offers insights into the status and health of the outputs, allowing for proactive maintenance actions to be taken before potential failures occur. This feature not only enhances operational reliability but also contributes to reduced downtime and maintenance costs.

Safety is paramount in any industrial environment, and the 430 DO module incorporates safety features that comply with international safety standards. These features enable fail-safe operations, ensuring that process integrity is maintained even in the event of an unexpected shutdown or fault.

In summary, Emerson Process Management's 430 DO digital output module stands out for its versatile output configurations, advanced signal processing technologies, seamless integration with control systems, built-in diagnostics, and emphasis on safety. Its design reflects Emerson's commitment to providing tools that enhance performance and streamline operations in the ever-evolving landscape of industrial automation. With the 430 DO, organizations can expect improved efficiency and reliability in their process management systems.
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