Emerson Process Management 430 DO User Manual
Model 430 DO
Dissolved Oxygen Sensor
Instruction Manual
PN 51-430/rev.A
May 1996
CAUTION
SENSOR/PROCESS
APPLICA
TION COMPATIBILITY
The wetted sensor materials may not be
compatible with process composition
and operating conditions. Application
compatibility is entirely the responsibility of the user.
DANGER
HAZARDOUS AREA INSTALLATION
Installations near flammable liquids or in hazardous
area locations must be carefully evaluated by qualified on site safety personnel. This sensor is not
Intrinsically Safe or Explosion Proof.
To secure and maintain an intrinsically safe installation, the certified safety barrier, transmitter, and
sensor combination must be used. The installation system must comply with the governing
approval agency (FM, CSA or BASEEFA/CENELEC) hazardous area classification requirements. Consult your analyzer/transmitter instruction 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 instruments 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; property damage; damage to this instrument; and warranty invalidation.
• Read all instructions prior to installing, operating, and servicing the product. If this Instruction Manual is not the correct manual, telephone 1-800654-7768 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 procedures can affect the product’s performance and place the safe operation of your process at risk. Look alike substitutions may result in fire, electrical 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
© Rosemount Analytical Inc. 2003
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
i
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
ii
MODEL 430 DO TABLE OF CONTENTS
1
•
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 recharging 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 variety of applications. The most widely used application is
the secondary phase of the waste treatment process
where a critical dissolved oxygen level must be maintained for the digestive process to occur. Other applications include water quality monitoring in natural bodies 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 constructed of PVC with an oxygen permeable Teflon1membrane .
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 compensation is necessary for two reasons: First, the solubility 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 measurement. 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 diffusion 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 replacement 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.
2
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 selected. 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 mounting 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
3
MODEL 430 DO SECTION 1.0
DESCRIPTION AND SPECIFICATIONS
FIGURE 1-2 Optional Mounting Bracket
DWG. NO. REV.
40043018 B
MILLIMETER
INCH
4
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.
1
Reg. U.S. Pat. Office for du Pont's fluorocarbon resins.
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