Xylem ODO RTU Manuale utente

ODO RTU™User Manual

OPTICAL DISSOLVED OXYGEN & TEMPERATURE SENSOR

USER MANUAL

ITEM# 627379-01

REVISION A

The information contained in this manual is subject to change without notice.

Effort has been made to make the information in this manual complete, accurate, and current.

The manufacturer shall not be held responsible for errors or omissions in this manual.

Consult YSI.com for the most up-to-date version of this manual.

Thank you for purchasing a YSI ODO RTU dissolved oxygen probe. This manual covers setup, operation, and functionality.

Safety Information

Please read this entire manual before unpacking, setting up or operating this equipment. Pay attention to all precautionary

statements. Failure to do so could result in serious injury to the operator or damage to the equipment. Do not use or install this

equipment in any manner other than that speciﬁed in this manual.

The manufacturer is not responsible for any damages due to misapplication or misuse of this product including, without limitation,

direct, incidental and consequential damages, and disclaims such damages to the full extent permitted under applicable law. The

user is solely responsible to identify critical application risks and install appropriate mechanisms to protect processes during a

possible equipment malfunction.

NOTICE: Indicates a situation which, if not avoided, may cause damage to the instrument

Precautionary Symbols

Product Components

Carefully unpack the instrument and accessories and inspect for damage. If any parts or materials are damaged, contact YSI

Customer Service at 800-897-4151 (+1 937 767-7241) or the authorized YSI distributor from whom the instrument was purchased.

NOTE: Information that requires special emphasis

WARNING: Indicates a potentially or imminently hazardous situation which, if not avoided, could result in death

or serious injury

CAUTION: Indicates a potentially hazardous situation that may result in minor or moderate injury

When viewing this document as an AdobeTM

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will bring up the ﬁnger-point icon. Clicking

elements of the Table of Contents, website URLs,

or references to certain sections will take you

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THIS IS AN

INTERACTIVE DOCUMENT

TABLE OF CONTENTS

1. Introduction

1.1 Probe Assembly

1.2 Preparing the Probe and Sensor

2. Setup

2.1 Wiring

2.2 Power

3. Calibration

3.1 Calibration Setup

3.2 Conductivity

3.3 Dissolved Oxygen

4. Maintenance and Storage

4.1 Conductivity Sensor

4.2 Optical Dissolved Oxygen Sensor

5. Modbus Conﬁguration & Commands

5.1 Modbus Serial Conﬁguration

5.2 Device Information

5.3 Data

5.4 Calibration

5.5 User Values for Derived Parameters

5.6 Conductivity Settings

5.7 Appendix A: Register Mapping Tables

6. Accessories

6.1 Ordering

7. Safety and Support

7.1 Service Information

7.2 Technical Support

7.3 Declaration of Conformity

7.4 Warranty

8. Appendices

8.1 Appendix B - DO% Calibration Values

8.2 Appendix C - Oxygen Solubility Table

Introduction

1.1

1. Introduction

1.2

Probe Assembly

Preparing the Probe and Sensor

ODO RTU assemblies feature integral sensors — this means that these sensors cannot be removed from the probe and cable. Sensor

caps are user-replaceable and need to be changed out about once per year.

NOTE: Each ODO cable assembly and sensor cap includes an instruction sheet with important information unique and

speciﬁc to each individual sensing cap. These are important because they include calibration coefﬁcients needed for

proper setup.

NOTE: A new cable/probe assembly already has a sensor cap installed and the sensor cap coefﬁcients are preloaded into

the probe at the factory.

1. Remove the metal probe guard from the probe by turning it counterclockwise.

2. Remove the red storage cap which, contains a moist sponge, from the end of the probe by pulling it straight off the sensor.

Save this to use later for long-term storage.

3. Reinstall the probe guard by sliding it carefully over the sensor and then threading it onto the cable assembly with a

clockwise rotation.

CAUTION: It is important to always store your sensor in a moist environment so the sensor cap does not dry out. A grey

calibration/storage sleeve is shipped with your cable assembly for an easy storage option. Simply moisten

the sponge with a small amount of clean water and slide the sleeve over the probe guard to create a moist

atmosphere for the sensor.

Figure 1 ODO probe and cable assembly

1 Probe

2 Sensor

3 Sensor Cap

Setup

2.1 Wiring

2. Setup

ODO RTU is conﬁgured with native Modbus output built around the RS485 standard physical layer. The ﬂying lead cable is

terminated with its ends trimmed and tinned for easy wiring. These ends can be connected to a third party Modbus capable PLC

or data logger.

Wire Color Purpose

Red Power

Green Ground

White Modbus A

Black Modbus B

2.2 Power

ODO RTU requires 10-16 VDC with a maximum current of 15 mA. The sensor will pull 0.12 W while powered. Once power is

supplied to the sensor, the probe will complete a 1-2 second power up sequence before it can be queried for a value. Please note,

while the probe can return a value, if the sensor cap is not equilibrated, the returned value may be inaccurate. This is not an issue if

the sensing cap has been continuously submerged in the sample.

Calibration

3.1

3. Calibration

ODO RTU requires periodic calibration. Calibration procedures follow the same basic steps with variations for the speciﬁc

parameter. The speciﬁc Modbus commands that accompany the calibration can be found in the Modbus Conﬁguration and

Commands section of this document

Make sure the calibration cup, sensor guard, and all sensors are clean. YSI strongly recommends installing the sensor guard before

placing the sensors into the calibration cup.

For highest data accuracy, thoroughly rinse the calibration cup and sensors with a small amount of the calibration standard for the

sensor to be calibrated. Discard the rinse standard, and proceed with a fresh standard.

Be careful to avoid cross-contamination with other standards between calibrations by thoroughly rinsing with DI water and drying

the calibration cup and sensors.

Calibration Setup

Calibration

3.2 Conductivity

If installed, the conductivity/temperature sensor can measure and calculate conductivity, speciﬁc conductance (temperature

compensated conductivity), salinity, non-linear function (nLF) conductivity, TDS, resistivity, and density. Calibration is only

available for speciﬁc conductance, conductivity, and salinity. Calibrating one of these options automatically calibrates the other

conductivity/temperature parameters listed above. For both ease of use and accuracy, YSI recommends calibrating speciﬁc

conductance.

Select the appropriate calibration standard for the conductivity of the sampling environment. Standards at least 1 mS/ cm (1000

μs/cm) are recommended for the greatest stability. For fresh water applications, calibrate to 1,000. For salt water applications,

calibrate to 50,000 μS.

Conductivity Calibration

1. Make sure the conductivity sensor is clean prior to calibration. If necessary,

clean the conductivity cell with the supplied soft brush.

2. Place the correct amount of conductivity standard into a clean and dry or

pre-rinsed calibration cup.

3. Carefully immerse the sensors into the solution. Make sure the solution is

above the vent holes on the side of the conductivity sensor.

If using the ODO/CT assembly, ensure the vent holes at the top of the

sensor are completely immersed and the solution level is at least 1 cm

higher than the top vent holes (Figure 2). A graduated cylinder is included

with ODO/CT cable assemblies for the purpose of calibrating conductivity.

4. Gently rotate and/or move the sensor up and down to remove any

bubbles from the conductivity cell. Allow at least 40 seconds for

temperature equilibration before writing the value with the appropriate

Modbus command (see Modbus Conﬁguration and Commands for

more details).

5. Rinse the sensor in clean water then dry.

NOTE: If the data is not stabilized after 40 seconds, gently rotate

the sensor or remove/reinstall the calibration cup to make

sure that no air bubbles are in the conductivity cell.

If you get calibration error messages, check for proper

sensor immersion, verify the calibration solutions is fresh,

the correct value has been entered into the handheld, and/

or try cleaning the sensor.

Figure 2 ODO/CT Cable Assembly

Top Vent

Holes

Side Vent

Holes

Calibration

3.3 Dissolved Oxygen

ODO calibration requires the current “true” barometric pressure. Make sure that the barometric pressure has been input properly

and accurately prior to ODO calibration. See Modbus Conﬁguration and Commands for more details.

ODO% - Water Saturated Air Calibration

1. Place a small amount of clean water (5 mL) in the calibration cup or a wet

sponge into the calibration sleeve (Figure 3).

2. Make sure there are no water droplets on the ODO sensor cap or

temperature sensor.

3. Attach the probe guard and carefully slide into the calibration cup. Make

sure a seal is not created around the probe. Atmospheric venting is

required for accurate calibration.

4. Turn the instrument on and wait approximately 5 to 15 minutes for the air

in the storage container to be completely saturated with water.

5. Allow at least 40 seconds for equilibration before writing the value with

the appropriate Modbus command (see Modbus Conﬁguration and

Commands for more details).

ODO mg/L Calibration

1. Place the ODO and conductivity/temperature sensor into a water sample

that has been titrated by the Winkler method to determine the dissolved

oxygen concentration in mg/L.

2. Enter the dissolved oxygen concentration of the sample in mg/L.

3. Allow at least 40 seconds for equilibration before writing the value with

the appropriate Modbus command (see Modbus Conﬁguration and

Commands for more details).

4. Rinse the bulkhead and sensors in clean water then dry.

ODO Zero Point Calibration

1. Place the sensor in a solution of zero DO.

NOTE: A zero DO solution can be made by dissolving approximately 8-10

grams of sodium sulﬁte into 500 mL of tap water. Mix the solution

thoroughly. It may take the solution 60 minutes to be oxygen-free.

2. Allow at least 40 seconds for equilibration before writing the value with

the appropriate Modbus command (see Modbus Conﬁguration and

Commands for more details).

3. Thoroughly rinse the bulkhead and sensors in clean water then dry.

4. Perform a ODO % water-saturated air calibration after performing a zero

point calibration.

Figure 3 ODO Cable Assembly in

calibration sleeve

Maintenance and Storage

4.1

4. Maintenance and Storage

Follow all maintenance and storage procedures in this section. Incorrect or unapproved maintenance and/or storage can cause

sensor or cable damage not covered by the warranty.

Storage terms are deﬁned as follows:

Short-term Storage = Less than 4 weeks

Short-term storage is appropriate when the cables, and sensors will be used at regular intervals (daily, weekly, etc.).

Long-term Storage = More than 4 weeks

During long periods of inactivity, such as the “off-season” for environmental monitoring, the instrument, sensors, and cables should

be placed in long-term storage.

YSI recommends cleaning and maintenance before long-term storage.

The conductivity channels should be cleaned after each use. Dip the sensor’s

cleaning brush (included with the maintenance kit) in clean water, insert the brush

at the top of the channels, and sweep the channels 15 to 20 times (Figure 4).

If deposits have formed on the electrodes, use a mild solution of dish soap and

water to brush the channels. For heavy deposits, soak the sensor in white vinegar,

then scrub with the cleaning brush. Rinse the channels with clean water following

the sweepings or soak.

The ODO/CT probe must be stored in a moist environment.

Conductivity Sensor

Figure 4 Channel brush

Maintenance and Storage

4.2 Optical Dissolved Oxygen Sensor

The ODO sensor should be kept clean since some types of fouling may consume

oxygen which could affect the dissolved oxygen measurements.

To clean the sensor cap, gently wipe away any fouling with a lens cleaning tissue

that has been moistened with water to prevent scratches (Figure 5). Do not clean

the ODO sensor with organic solvents as they may damage the cap.

To minimize sensor drift, always store the ODO sensor in a wet or water-saturated

air environment.

Figure 5 Wiping the ODO

sensor window

Figure 6 ODO short-term storage

Short-term Storage:

Store the ODO sensor in a moist air environment. A storage sleeve with a wet

sponge or the calibration cup with a small amount of water is recommended.

Long-term Storage:

• Method 1: Submerge the sensing end of the sensor in a container of distilled

or deionized water. Periodically check the level of the water to make sure that it

does not evaporate.

• Method 2: Wet the sponge located in the cap originally included with the

ODO sensor, then install on sensing end of the ODO sensor. Replace the

sponge if it becomes dirty.

A grey storage sleeve is shipped with the cable for an easy storage option. Simply

moisten the sponge with a small amount of clean water and slide the sleeve over

the probe guard to create a moist atmosphere for the sensor.

ODO Sensor Rehydration

If the ODO sensor has accidentally been left dry for longer than 8 hours, it must

be rehydrated. To rehydrate, soak the ODO sensor in room temperature tap water

for approximately 24 hours. After the soak, calibrate the sensor.

Figure 7 ODO rehydration

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