In-situ RDO PRO-X Operator's Manual

Page 1

Operator's Manual

RDO®PRO-X Process Optical Dissolved Oxygen Probe

Informationsubject to change without notice. In-Situ, In-Situ logo, Baro Merge, BaroTROLL, HERMIT, HydroVu™, iSitu, Pocket-Situ, RDO, RuggedCable, RuggedReader, SmarTROLL™, TROLL, VuSitu, and Win-Situ are trademarks or registeredtrademarks of In-Situ Inc.©2008-

0090102 | 2019-05-10

Page 2

This document contains proprietary information which is protected by copyright. No part of this document may be photocopied, reproduced, or translated to another language without the prior written consent of In-Situ

In-Situ makes no warranty of any kind with regard to this material, including, but not limited to, its fitness for a particular application. In-Situ will not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing, performance, or use of this material.

In no event shall In-Situ Inc. be liable for any claim for direct, incidental, or consequential damages arising out of, or in connection with, the sale, manufacture, delivery, or use of any product.

In-Situ and the In-Situ logo, Win-Situ, TROLL, Baro Merge, BaroTROLL, HERMIT, HyroVu™, iSitu, Pocket-Situ, RDO, RuggedCable, RuggedReader, TROLL, and VuSitu™, Win-Situ are trademarks or registered trademarks of In-Situ Inc. Microsoft and Windows are registered trademarks of Microsoft Corporation. Pentium is a registered trademark of Intel. Tefzel and Delrin are registered trademarks of E. I. DuPont de Nemours and Company. Viton is a registered trademark of DuPont Dow Elastomers. Kellems is a registered trademark of Hubbell Inc. Alconox is a registered trademark of Alconox Company. Lime-A-Way is a registered trademark of Reckitt Benckiser. Android is a trademark of Google Inc. iPod and iPhone are trademarks of of Apple Inc., registered in the U.S. and other countries. The Bluetooth word mark and logos are registered trademarks owned by the Bluetooth SIG, Inc. and any use of such marks by In-Situ Inc. is under license. NIST is a registered trademark of the National Institute of Standards and Technology, U.S.A. Other brand names and trademarks are property of their respective owners.

The presence of the Waste Electrical and Electronic Equipment (WEEE) marking on the product indicates that the device is not to be disposed via the municipal waste collection system of any member state of the European Union.

For products under the requirement of WEEE directive, please contact your distributor for the proper decontamination information and take back program, which will facilitate the proper collection, treatment, recovery, recycling, and safe disposal of the device.

Page 3

Table of Contents

1 Optical RDO PRO-X Dissolved Oxygen Probe Specifications

2 Introduction

System Description 6

Serial Numbers 7

Unpack the Probe 7

3 Calibrate the RDO PRO-X Probe

1-Point Calibration 9

Water-Saturated Air 9

2-Point Calibration 9

100% and 0% Saturation 9

4 Probe Deployment

5 Care and Maintenance

Clean the Sensor Cap 12

Clean the Optical Window 12

Clean the Probe 12

Sensor Cap Storage 12

Replace the Sensor Cap 12

Maintain Desiccant 13

6 Controller Requirements and Connections

Wiring Overview 14

Analog (4-20 mA) 3-wire 15

SDI-12 (3-wire) 16

Modbus Master with Built-in RS485 17

Modbus Master with Built-in RS232 (Converter Required) 18

Converter 19

Power Connections 19

Communications 19

7 Modbus Registers

Common Registers 20

Sensor Status Registers 20

Device Specific Register 0042 Data Quality ID 20

Device Specific Registers 21

8 Dissolved Oxygen Equations

Dissolved Oxygen Concentration 22

Dissolved Oxygen, % Saturation 23

9 Calibration Registers

Live Salinity Value 24

Default Salinity Value 24

Live Barometric Pressure 24

Default Barometric Pressure 24

Page 4

100% Saturation Calibration Values 24

0% Saturation Calibration Values 24

Calibration Slope and Offset 25

Entering Calibration Registers 25

Calibration Calculations 26

10 Service

Sensor Health Table 27

11 Appendix A - Communication Device

Install and Open the Software 28

Connect the Probe to the Communication Device 28

12 Declaration of Similarity

Page 5

Optical RDO PRO-X Dissolved Oxygen Probe Specifications

Optical RDO PRO-X Dissolved Oxygen Probe

Sensor Type Optical (luminescent) dissolved oxygen sensor

Range: 0 to 60 mg/L concentration

Accuracy: ±0.1 mg/L from 0 to 20 mg/L

RDO PRO-X Probe

RDOClassic Cap

RDO-X Sensor Cap

RDOFast Cap

Temperature sensor

Transmitter/local display Optional, or use with Con TROLL PRO System

Communications options Modbus/RS485, 4-20 mA, SDI-12

Max. power consumption 50 mA at 12 VDC

Measure current 6 mA typical at 24 VDC

Idle current (no measurement or communication)

Maximum cable length Up to 1,219 m (4,000 ft) (for Modbus and 4-20 mA) or up to 60.96 (200 ft) for SDI-12

Cable options

Internal mounting thread 1¼ - 11 ½ NPT

IP rating IP-67 with cap off, IP-68 with cap installed

Compliance Heavy industrial, IEC 61000-6-2:2005

Salinity compensation Fixed or real-time capable (using controller)

Barometric pressure Fixed or real-time capable (using controller)

Maximum pressure 150 psi from 0 to 50° C; 300 psi @ 25° C

Warranty

Methods

±2% of reading from 20-60 mg/L

Resolution: 0.01 mg/L

Response time: T90 < 45 sec; T95 < 60 sec @ 25°C

Storage conditions: -5° to 60° C (23° to 140° F)

Usage life: 2 years typical

Storage conditions: 1° to 60° C (33° to 140° F), in factory container

Range: 0° to 50° C (32° to 122° F)

Accuracy: ±0.1° C typical

Resolution: 0.01° C

160 µA typical at 24 VDC

10 m fixed stripped-and-tinned; Twist-lock connector with user-selectable cable length

Probe: 3 years from date of shipment RDO-X Sensor Cap: 2 years in typical applications

Standard Methods 4500-O; In-Situ Methods 1002-8-2009,1003-8-2009, 1004-8-2009 (EPA approved)

Page 6

Introduction

The RDO PRO-X Probe is a rugged, reliable instrument designed to deliver accurate dissolved oxygen (DO) data across a wide measurement range and to reduce maintenance costs. The probe features the latest optical technology for DO measurement.

System Description

The RDO PRO-X system consists of the following items.

l Black probe body with removable nose cone

l Optical RDO-X Sensor Cap, Classic Cap, or Fast Cap

l Titanium thermistor

RuggedCable System

l 10-m standard length with stripped-and-tinned ends

l Customized lengths with titanium twist-lock connectors

1 Cable end, stripped-and-tinned

2 Nose cone

3 RDO-X Sensor Cap

4 Thermistor

Page 7

1 Probe

2 Cable end, twist-lock connector and RuggedCable System

Serial Numbers

The probe serial number is engraved on the side of the unit. The cap serial number is programmed on the memory chip inside the cap.

Unpack the Probe

1. Remove the probe from the box and other packaging materials.

2. Unscrew the nose cone from the probe and remove the red protective dust cap from the sensor. Save the dust cap for later use.

1 Dust cap

2 Nose cone

3. Remove the RDO cap from the storage sleeve.

4. Align the arrow on the cap with the index mark on the probe and firmly press the cap onto the probe, without twisting, until it seals over the probe body.

Page 8

1 Alignment arrow on cap

2 Cap installed over lens

3 Nose cone

Do not allow moisture or atmospheric humidity inside the cap. Keep the cap in its sealed package until you are ready to install it. Install promptly. Ensure that O-ring grooves are dry and that the O-ring is not rolled or pinched inside the cap. The typical cap lifetime is two years after the first reading has been taken.

5. Reattach the nose cone.

Page 9

Calibrate the RDO PRO-X Probe

Calibrate the sensor with Win-Situ 5 software or the VuSitu mobile app, or calibrate directly with your controller.

1-Point Calibration

The optical Rugged Dissolved Oxygen sensor is very stable. The factory calibration should produce readings within 3% accuracy. If you require readings with greater accuracy we recommend that you perform a 1-point, 100% water-saturated air calibration as described below.

Water-Saturated Air

1. Remove the storage cap from the top of the calibration chamber and replace it with the vented calibration cap.

1 Storage cap

2 Vented calibration cap

Figure 6.1 Storage cap and vented calibration cap shown together

2. Place the sponge wafer in the bottom of the calibration chamber and saturate with approximately 10 mL water.

3. Gently dry the instrument and sensing material with a paper towel, making sure there is no water or debris on the instrument or on the sensing surface.

4. Place the instrument into the calibration chamber about 2.5 cm (1 in.) above the water-saturated sponge.

Figure 6.2 Calibration chamber with water-saturated sponge

5. Allow 5 to 10 minutes for temperature stabilization prior to starting the calibration procedure. Do not leave the instrument in the calibration chamber for more than 30 minutes. This can allow condensation to form on the sensing material, which will produce false low readings after calibration. If condensation does occur, remove the instrument, dry the sensing material, place the instrument in the chamber, and calibrate.

2-Point Calibration

100% and 0% Saturation

We recommend that you perform the 0 % oxygen calibration only if you intend to measure dissolved oxygen at a concentration of less than 4 mg/L.

Page 10

1. Set up the calibration procedure as previously described, and perform a water-saturated air calibration.

2. Remove the water-saturated sponge from the calibration chamber and fill the chamber to the fill line with approximately 60 mL of fresh sodium sulfite solution.

1 Fill line

2 Temperature sensor

2. Place the instrument into the solution. Leave at least 13 mm (0.5 in.) between the surface of the sensing material and the bottom of the chamber.

3. Ensure that the temperature sensor is completely submerged in the solution.

4. Allow at least 5 minutes for the temperature to stabilize prior to performing the calibration procedure.

5. Once calibration is complete, remove the sensor, and thoroughly rinse to remove all of the sodium sulfite.

Page 11

Probe Deployment

The cable end of the RDO PRO-X Probe is internally threaded (1¼ – 11½ NPT) and can be attached to a male threaded pipe. When deployed, make sure that the nose cone and thermistor are completely submerged.

1 10 m cable attached

2 Twist-lock connector

3 1 1/4 NPT threading

Page 12

Care and Maintenance

Clean the Sensor Cap

1. The cap and nose cone must remain on the probe.

2. Rinse the sensor with clean water from a squirt bottle or spray bottle.

3. Gently wipe with a soft-bristled brush or soft cloth if biofouling is present. Use Alconox to remove grease.

4. If extensive fouling or mineral build-up is present, soak the cap end in vinegar for 15 minutes, then soak in deionized (DI) water for 15 minutes.

Do not use organic solvents—they will damage the sensing element. Do not remove the cap from the sensor prior to cleaning.

5. After cleaning, perform a 1- or 2-point user calibration or calibration check.

Clean the Optical Window

1. Clean the optical window only when you change the cap. See full instructions in the sensor cap replacement kit.

2. Remove the cap and gently wipe the lens with the supplied lens cloth.

Do not wet the lens area with water or any solution. Use only the supplied lens cloth for cleaning. Do not use any other cloth or material.

Clean the Probe

With the RDO cap installed on probe, gently scrub the probe with a soft-bristled brush or nylon dish scrubber. Use Alconox to remove grease or other matter. Soak in vinegar and DI water to remove mineral deposits or extensive fouling.

Sensor Cap Storage

Prior to installation—Store in factory supplied container.

Installed—Store in the calibration chamber with the storage cap attached and a few drops of clean water.

Replace the Sensor Cap

1. Remove the probe nose cone.

2. Use a lint-free cloth to remove any moisture from the probe.

3. Pull the used RDO cap off of the sensor, without twisting.

4. Remove the existing O-rings from the sensor.

Ensure that there is no moisture in the O-ring grooves. Do not touch or clean the lens with anything other than the supplied lens wipe.

5. Use your finger to apply a very light layer of silicone-based lubricant around the O-ring grooves.

6. Place the O-rings on the sensor. Apply another thin layer of lubricant to the O-rings and grooves.

Note: Do not transfer grease to the lens or sensor pins.

7. Clean the sensor lens with the wipe provided in the kit and allow it to thoroughly dry. Inspect for scratches or dirt.

Page 13

8. Remove the new cap from its sealed packaging and attach it to the sensor, being careful to press firmly, without twisting, until it seals over the lens. Make sure that the O-rings are not pinched or rolled between the cap and sensor.

9. Replace the nose cone.

10. Perform a 1- or 2-point calibration.

Maintain Desiccant

Desiccant installed in a controller or transceiver protects probe electronics from condensation. A desiccant pack changes color from blue to pink as it becomes saturated with moisture.

It is extremely important to use the proper size desiccant for your deployment and to change desiccant often. Desiccant should be changed before the entire pack has turned pink, and you should use enough to effectively keep cables and probes dry until your next scheduled maintenance. Desiccant lifespan is dependent on site conditions.

Page 14

Controller Requirements and Connections

The RDO PRO-X Probe may be connected to a controller or logger for communication via the following options.

l Analog (4-20 mA) provides a configurable 4-20 mA current loop output

l SDI-12

l RS485 Modbus

l RS232 to Modbus

Wiring Overview

Refer to diagrams on the following pages. Trim and insulate unused wires. The shielded wire should be connected to a chassis ground or earth ground.

The inside of the controller must be kept free of moisture and humidity. Condensed moisture can migrate through the wiring and cause the probe to fail. Therefore, desiccant should be installed in the controller and be replaced on a regular basis.

Page 15

Analog (4-20 mA) 3-wire

Signal Color

Ground/Return Black

External Power (12-36 VDC)

Red

4-20 mA Brown

Cable length must not exceed 1219 m (4000 ft.) Analog signal must be enabled in Win-Situ 5 Software or the Comm Kit Software prior to use.

Page 16

SDI-12 (3-wire)

Signal Color

Ground/Return Black

External Power (9.6-16 VDC)

Red

RS485 (-) Green

RS485 (+) Blue

SDI-12 White

Cable length must not exceed 60.96 m (200 ft.)

Page 17

Modbus Master with Built-in RS485

Signal Color

Ground/Return Black

External Power (12-36 VDC)

Red

RS485 (-) Green

RS485 (+) Blue

Cable length must not exceed 1219 m (4000 ft.)

Page 18

Modbus Master with Built-in RS232 (Converter Required)

Signal Color

Ground/Return Black

External Power

(12 VDC, voltage limited by converter)

RS485 (-) Green

RS485 (+) Blue

Red

Cable between converter and master must not exceed 60.96 m (20 ft.) Cable between master and slave must not exceed 1219 m (4000 ft.)

Page 19

Converter

Power Connections

The red wire provides power for all system modes. Analog output is disabled by default. However, the 4-20 mA current loop output can be continuous in Modbus or SDI-12 mode as long as Modbus device register 9507 is set to 1.

Communications

The device automatically switches between Modbus and SDI-12 modes depending on which of the two interfaces has activity. Modbus and SDI-12 cannot be used at the same time—whichever one is currently in use will block communication on the other.

Page 20

Modbus Registers

Common Registers

Mode &

9001 1 R/W ushort

9002 2 R/W ulong Device serial number

9004 3 R/W time Manufacture date

Sensor Status Registers

0005 3 R1 time

0008 3 R1 time

Device Specific Register 0042 Data Quality ID

Access Level

(R/W)

Mode &

Access Level

(R/W)

Data Type Description

Device ID = 19 for RDO Titan31 for RDO PRO-X35 for RDOBlue

Data Type Description

Cap start date/time 0 = no cap

Cap end of usable life date/time 0 = no cap

Register 0042 is responsible for returning the various data quality IDs for the RDO sensor. For a list of the Data Quality IDs and definitions, see the Sensor Health Table in the Service and Troubleshooting section of this manual.

Page 21

Device Specific Registers

Mode &

0038 2 R1 float

0040 1 R1 ushort Parameter ID = 20

0041 1 R1/W2 ushort

0042 1 R1 ushort Data quality ID (See the Sensor Health Table)

0043 2 R1/W3 float Offline sentinel value (default = 0.0)

0045 1 R1 16 bits Available units = 0x0030 (48)

0046 2 R1 float Measured value

0048 1 R1 ushort Parameter ID = 1

0049 1 R1/W2 ushort

0050 1 R1 ushort Data quality ID

0051 2 R1/W3 float Offline sentinel value (default = 0.0)

0053 1 R1 16 bits Available units = 0x00030 (3)

0054 2 R1 float Measured value

0056 1 R1/W2 ushort Parameter ID = 21

0057 1 R1/W2 ushort

0058 1 R1 ushort Data quality ID

0059 2 R1/W3 float Offline sentinel value (default = 0.0)

0061 1 R1 16 bits Available units = 0x0001 (1)

0062 2 R1 float Measured value

0064 1 R1 ushort Parameter ID = 2 (pressure)

0065 1 R1/W2 ushort

0066 1 R1 ushort Data quality ID

0067 2 R1/W3 float Offline sentinel value (default = 0.0)

0069 1 R1 16 bits Available Units = 0x0200 (512)

Access Level

(R/W)

Data Type Description

Dissolved Oxygen Concentration

Measured value, C

Units ID 117 = mg/L (default) 118 = ug/L

Temperature

Units ID 1= °C (default) 2= °F

Dissolved Oxygen % Saturation

Units ID 177 = percent saturation (default)

Oxygen Partial Pressure

Units ID 26 = torr (default)

Page 22

Dissolved Oxygen Equations

Dissolved Oxygen Concentration

DO concentration is internally calculated in mg/L. Conversion to other units is as follows:

Page 23

Dissolved Oxygen, % Saturation

Page 24

Calibration Registers

0118 2 R1/W3 float Live salinity value (PSU)

0120 2 R1/W3 float Default salinity value (PSU, default = 0.0)

0122 2 R1/W3 float Live barometric pressure (mbar)

0124 2 R1/W3 float Default barometric pressure (mbar, default = 1013.25)

0126 2 R1/W3 float 100% saturation calibration reading (mg/L)

0128 2 R1/W3 float 100% saturation temperature reading (°C)

0130 2 R1/W3 float 100% saturation salinity value (PSU)

0132 2 R1/W3 float 100% saturation barometric pressure (mbar)

0134 2 R1/W3 float 0% saturation calibration reading (mg/L)

0136 2 R1/W3 float 0% saturation temperature reading (°C)

0138 2 R1/W3 float Calibration slope (default = 1.0)

0140 2 R1/W3 float Calibration offset (default = 0.0)

Mode & Access

Level (R/W)

Data Type Description

Live Salinity Value

The live salinity value is used to correct the oxygen concentration value for salinity. Values must be written in Practical Salinity Units (PSU) in the range 0 to 42 PSU. This is not a measured parameter.

Default Salinity Value

The default salinity value is loaded into the live salinity value register when power is first applied to the probe. The default salinity value is used in calculations until a live salinity value is written. This is not a measured parameter.

Live Barometric Pressure

The live barometric pressure is used in the calculation of percent saturation and to determine the theoretical saturation point during calibration. Values must be written in millibars in the range 506.625 to 1114.675 mbar. This is not a measured parameter.

Default Barometric Pressure

The default barometric pressure is loaded into the live barometric pressure register when power is applied to the probe. The default barometric pressure is used in calculations until a live barometric pressure is written. This is not a measured parameter.

100% Saturation Calibration Values

These values represent the sensor conditions while the probe is in a 100% saturation calibration environment. These are not measured values, they are written by the controller during the calibration process.

Writes to these registers are only accepted if the probe is in the calibration mode. The probe will return exception 0x85 (invalid device command sequence) if an attempt is made to write these registers when the calibration mode is off.

0% Saturation Calibration Values

These values represent the sensor conditions while the probe is in a 0% saturation calibration environment. These are not measured values, they are written by the controller during the calibration process.

Page 25

Calibration Slope and Offset

These values represent the slope and offset that will be applied to the raw concentration reading from the sensor to generate the final values reported by the sensor parameters. These registers may be written independently of the normal internal calibration procedure.

Entering Calibration Registers

The sensor is calibrated using the following procedure.

1. Optional: Read the Sensor Data Cache Timeout register 9463 and store the value.

2. Write the Sensor Data Cache Timeout register 9463 to a value less than your intended sample rate and greater than 1000 milliseconds. This will ensure that you get new sensor readings during the stabilization process.

3. Optional: Read the temperature units register 0049 and saturation units register 0041 and store their values.

4. Write the temperature units register 0049 to its default value (1) and write the saturation units register 0041 to its default value (117).

5. Write the Calibration Mode On command (0xE000) to the sensor command register 9305.

6. Update the live salinity and barometric pressure registers if necessary.

7. Prompt the user to place the probe in a 100% saturation environment.

8. Read the oxygen concentration and temperature parameters. When these values have reached equilibrium, record them in their respective 100% saturation calibration registers. Write the current live salinity and barometric pressure readings to their respective calibration registers.

9. Place the sensor in a 0% saturation environment. When these registers have reached equilibrium, record them in their respective 0% saturation calibration registers. If a zero calibration is not to be performed, these registers can be set to zero or left at their previous values.

10. Write the Calibration Update command (0xE001) to the sensor command register. The sensor will calculate a new slope and offset, write the current time to the last user calibration time register, and set the next user calibration time register to zero (disabled). If the concentrations at 100% and 0% saturation are equal, the probe will return an exception response with code 0x97 (invalid calibration) and not attempt to compute a new slope and offset due to possible division by zero. If the slope does not calculate between 0.85 and 1.20 inclusive, or if the offset does not calculate between -0.2 and +0.2 inclusive, then the probe will return an exception response with code 0x97 (invalid calibration).The slope and offset will be available for read but will not be committed to flash.

11. Optional: Read the last user calibration time register, add the next calibration interval, and write the result to the next user calibration time register.

12. Write the Calibration Mode Off command (0xE002) to the sensor command register to place the sensor in normal operation. If the calibration mode is turned off without a calibration update command, or the calibration command returned an exception, the previous calibration shall be restored.

13. Optional: If you saved the temperature and saturation parameter units at the start of the process, write the original values back.

14. Optional: If you saved the Sensor Data Cache Timeout register 9463 at the start of the process, write the original value back.

Page 26

Calibration Calculations

Page 27

Service

The RDO PRO-X contains no user-serviceable parts. Do not attempt to open the probe case or service the unit yourself.

RDO Software Troubleshooting

Sensor health diagnostics indicate when the RDO sensor has been damaged in the field. If the sensor has sustained moderate damage, the probe provides a DO value that includes a (DIS or Data Quality ID 5) warning. The same warning is included with readings taken after the sensor has reached its 24-month recommended lifespan.

However, if the sensor has been severely damaged, an error message is shown (ERR or Data Quality ID 3), a DO value is not provided and the sentinel value is shown. This prevents you from receiving an erroneous reading.

Sensor Health Table

The following error messages appear in the software and the data file when a sensor issue has been detected.

Abbreviation Data Quality ID Text Description

None 0 None Normal Data Quality

UC 1

FC 2

User Cal Expired

Factory Cal Expired

ERR 3 Unknown Error

WU 4

DIS 5

CAL 6

Sensor Warmup

Sensor Warning

Sensor Calibrating

OL 7 Sensor Missing

Parameter measured without errors using an expired user calibration.

Parameter measured without errors using an expired factory calibration.

Parameter measured with error, sentinel value supplied.

Sensor is warming up, sentinel value supplied.

Parameter measured but does not meet normal quality criteria. The sensor has sustained moderate damage, or the recommended lifespan has been reached.

Sensor is calibrating, calibration value supplied.

Sensor communication failed, sentinel value supplied. Make sure the sensor cap is installed and properly seated.

Page 28

Appendix A - Communication Device

The Communication Device is an accessory product that can be used to calibrate and set up RDO probes.

Install and Open the Software

The Comm Kit Software must be installed on a computer before you connect to the probe.

Connect the Probe to the Communication Device

The Communication Device connects a stripped-and-tinned probe to a computer via USB connection.

1. Disconnect the instrument from the PLC.

2. The communication device includes an electrical connection diagram label. To attach the instrument to the communication device, depress a lever and insert the appropriate wire in the location specified by the diagram.

3. Attach the USB connector to a USB port on the computer. Follow the directions provided in the Communication Device Kit to set up the probe.

Page 29