Emerson Dissolved Oxygen Sensor Model 430 DO Manual de usuario

Model 430 DO

Dissolved Oxygen Sensor

Instruction Manual

PN 51-430/rev.A

May 1996

CAUTION

SENSOR/PROCESS

APPLICATION COMPATIBILITY

The wetted sensor materials may not be

compatible with process composition

and operating conditions. Application

compatibility is entirely the responsibili-

ty of the user.

DANGER

HAZARDOUS AREA INSTALLATION

Installations near flammable liquids or in hazardous

area locations must be carefully evaluated by qual-

ified on site safety personnel. This sensor is not

Intrinsically Safe or Explosion Proof.

To secure and maintain an intrinsically safe instal-

lation, the certified safety barrier, transmitter, and

sensor combination must be used. The installa-

tion system must comply with the governing

approval agency (FM, CSA or BASEEFA/CEN-

ELEC) hazardous area classification require-

ments. Consult your analyzer/transmitter instruc-

tion manual for details.

Proper installation, operation and servicing of this

sensor in a Hazardous Area Installation is entirely

the responsibility of the user.

ESSENTIAL INSTRUCTIONS

READ THIS PAGE BEFORE PROCEEDING!

Rosemount Analytical designs, manufactures, and tests its products to

meet many national and international standards. Because these instru-

ments are sophisticated technical products, you must properly install, use,

and maintain them to ensure they continue to operate within their normal

specifications. The following instructions must be adhered to and integrated

into your safety program when installing, using, and maintaining Rosemount

Analytical products. Failure to follow the proper instructions may cause any

one of the following situations to occur: Loss of life; personal injury; proper-

ty damage; damage to this instrument; and warranty invalidation.

• Read all instructions prior to installing, operating, and servicing the prod-

uct. If this Instruction Manual is not the correct manual, telephone 1-800-

654-7768 and the requested manual will be provided. Save this

Instruction Manual for future reference.

• If you do not understand any of the instructions, contact your Rosemount

representative for clarification.

• Follow all warnings, cautions, and instructions marked on and supplied

with the product.

• Inform and educate your personnel in the proper installation, operation,

and maintenance of the product.

• Install your equipment as specified in the Installation Instructions of the

appropriate Instruction Manual and per applicable local and national

codes. Connect all products to the proper electrical and pressure sources.

• To ensure proper performance, use qualified personnel to install, operate,

update, program, and maintain the product.

• When replacement parts are required, ensure that qualified people use

replacement parts specified by Rosemount. Unauthorized parts and pro-

cedures can affect the product’s performance and place the safe opera-

tion of your process at risk. Look alike substitutions may result in fire, elec-

trical hazards, or improper operation.

• Ensure that all equipment doors are closed and protective covers are in

place, except when maintenance is being performed by qualified persons,

to prevent electrical shock and personal injury.

Emerson Process Management

Liquid Division

2400 Barranca Parkway

Irvine, CA 92606 USA

Tel: (949) 757-8500

Fax: (949) 474-7250

http://www.raihome.com

About This Document

This manual contains instructions for installation and operation of the Model 430 Dissolved Oxygen

Sensor. The following list provides notes concerning all revisions of this document.

Rev. Level Date Notes

A 5/96 This is the initial release of the product manual. The manual has been refor-

matted to reflect the Emerson documentation style and updated to reflect any

changes in the product offering.

MODEL 430 DO TABLE OF CONTENTS

MODEL 430

DISSOLVED OXYGEN

TABLE OF CONTENTS

Section Title Page

1.0 DESCRIPTION AND SPECIFICATIONS................................................................. 1

1.0 Features and Applications ...................................................................................... 1

1.2 Operation ................................................................................................................ 1

1.3 Available Models...................................................................................................... 2

1.4 Specifications........................................................................................................... 2

1.5 Ordering Information ............................................................................................... 4

2.0 INSTALLATION ....................................................................................................... 5

2.1 General.................................................................................................................... 5

2.2 Unpacking and Inspection ...................................................................................... 5

2.3 Mechanical Installation ........................................................................................... 5

2.4 Electrical Installation................................................................................................ 5

3.0 MAINTENANCE ...................................................................................................... 9

3.1 General.................................................................................................................... 9

3.2 Recharging the Sensor............................................................................................ 9

4.0 TROUBLESHOOTING............................................................................................. 10

4.1 General.................................................................................................................... 10

4.2 Troubleshooting ....................................................................................................... 10

4.3 Bench Testing .......................................................................................................... 10

5.0 PARTS LIST ........................................................................................................... 11

5.1 General.................................................................................................................... 11

6.0 RETURN OF MATERIAL ......................................................................................... 15

6.1 General.................................................................................................................... 15

6.2 Warranty Repair....................................................................................................... 15

6.3 Non Warranty Repair ............................................................................................... 15

TABLE OF CONTENTS CONTINUED

LIST OF FIGURES

Number Title Page

1-1 Flow Through Senson Assemblies ......................................................................... 2

1-2 Optional Mounting Bracket ..................................................................................... 3

2-1 Code 01 and 02 Flow Through Installation ........................................................... 6

2-2 Sensor Dimensions ................................................................................................ 7

5-1 Model 430 (Codes 01 and 02) Dissolved Oxygen Sensor ..................................... 11

5-2 Model 430 Sensor Assembly .................................................................................. 12

5-3 Model 430 (Code 03) Dissolved Oxygen Sensor ................................................... 13

5-4 Model 430 (Code 04) Dissolved Oxygen Sensor.................................................... 14

LIST OF TABLES

Number Title Page

2-1 Electrical Connections ........................................................................................... 5

MODEL 430 DO TABLE OF CONTENTS

•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.

MODEL 430 DO SECTION 1.0

DESCRIPTION AND SPECIFICATIONS

SECTION 1.0

GENERAL DESCRIPTION AND SPECIFICATIONS

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 Teflon1mem-

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.

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

MODEL 430 DO SECTION 1.0

DESCRIPTION AND SPECIFICATIONS

1.3 AVAILABLE MODELS

The Model 430-01 and -02 Sensor is a flow through

assembly. The sensor is supplied in a 1-1/2 inch PVC

tee for installation into a process line.

The Model 430-03 Submersible Sensor is for use in

those applications where the required flow velocity can

be maintained without the use of an agitator. When the

measurement is being made in a stagnant pond or

other media where the minimum flow rate of 1.5 FPS

cannot be obtained, the Model 430-04 must be select-

ed. This model is designed for submersible use and is

provided with its own agitator to ensure adequate flow

velocity at the membrane.

The Models 430-03 and 04 may be provided with an

optional mounting bracket assembly. This bracket is

constructed of light weight aluminum and can be

adjusted to satisfy virtually any aeration basin mount-

ing requirement. Once installed, the probe can be

removed without the use of tools. A single locking pin

holds the assembly rigidly in place but allows it to be

easily removed for inspection or cleaning.

1.4 SPECIFICATIONS

Process Connection:

430-00/01 1-1/2 inch socket fitting

Wetted Materials: HOUSING - PVC

MEMBRANE - Teflon

PRESSURE COMPENSATOR - Neoprene

Temperature Compensation:

0 to 50°C (32 to 122°F) Automatic

Sample Pressure: 0-50 psig (345 kPa abs)

Submersible to 200 ft. (61 m).

Agitator Power Requirement: Model 430-04 only)

115 Vac, ±10 60 Hz (0.2 amp)

Cable Length (standard):

6.1 meters (20 ft) on sensor and agitator

Maximum Cable Length:

305 meters (1000 ft)

Operating Time Between Electrolyte Recharge:

Approximately 12 months or longer, depending upon

application

Sample Flow Requirements for Models 430-01-02-03:

1.5 feet per seconds (0.5 m/s)

FIGURE 1-1 Flow Through Assemblies

DWG. NO. REV.

40043019 A

MILLIMETER

INCH

MODEL 430 DO SECTION 1.0

DESCRIPTION AND SPECIFICATIONS

FIGURE 1-2 Optional Mounting Bracket

DWG. NO. REV.

40043018 B

MILLIMETER

INCH

MODEL 430 DO SECTION 1.0

DESCRIPTION AND SPECIFICATIONS

1.5 ORDERING INFORMATION. The Model 430 Dissolved Oxygen Sensor: Includes PVC body with integral,

oxygen-permeable membrane of Teflon1. Temperature and pressure compensators included. Compatible with

Model1181DO.

MODEL

430 DO DISSOLVED OXYGEN SENSOR

CODE MOUNTING HARDWARE

01 1-1/2” PVC flow cell, 90° flow

02 1-1/2” PVC flow cell, 180° flow

03 PVC union with 3/4” FNPT for submersion service

04 PVC union with 1” FNPT and agitator with 20 foot cable for submersion. Agitator motor requires

115 VAC power only.

499 DO 01 16 EXAMPLE

CODE MOUNTING HARDWARE

11 Stainless steel tag (specify marking)

14 Handrail mounting bracket (P/N 1000857) for use with junction box (see Code 17 below).

15 Handrail mounting bracket (P/N 1000856) for use with Model 803

17 Weatherproof, NEMA 4X junction box (P/N 22719-02)

NOTES:

Recommended interconnecting cable from sensor to transmitter is Belden 8434 or equivalent, available from Rosemount Analytical as P/N

9200074. Specify length.

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

MODEL 430 DO SECTION 2.0

INSTALLATION

SECTION 2.0

INSTALLATION

2.1 GENERAL. This section provides instructions for

the Model 430 Dissolved Oxygen Sensor.

2.2 UNPACKING AND INSPECTION. Inspect the ship-

ping container and remove the sensor. Carefully check

the sensor and its associated hardware for any dam-

age. Report any damage to the carrier immediately.

2.3 MECHANICAL INSTALLATION. The sensor

comes in four different configurations. Follow the

instruction for the configuration being installed. See

Figure 2-2 for dimensions. Figure 1-2 illustrates

optional bracket assembly for sensor installation in

tanks or ponds.

2.4 Electrical Installation. Connect the sensor to the

transmitter as shown in Table 2-1.

2.3.1 Codes 01 and 02 (see Figure 2-1). These config-

urations are for flow through measurements. Install the

tee using 1-1/2 inch PVC. For the angle flow (Code

01), make sure the flow enters at the opening opposite

the sensor, so that the sample flows directly into the

membrane.

2.3.2 Codes 03 and 04 (see Figure 5-3 and Figure 5-

4). These configurations are for submersion into a tank

or pond. The Code 03 configuration requires a flow

past the sensor of 1.5 feet per second (0.5 m/s). The

Code 04 configuration is for stagnant or still tanks and

ponds.

Sensor Lead Model 1181DO

1. (Red) silver anode TB2-4

2. Shield TB2-2

3. (White) T.C. element TB2-1

4. (Green) T.C. element TB2-3

5. (Black) gold cathode TB2-3

TABLE 2-1 Electrode Connections

MODEL 430 DO SECTION 2.0

INSTALLATION

FIGURE 2-1. Codes and 01 and 02 Flow Through Installation

DWG. NO. REV.

40043001 G

MILLIMETER

INCH

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