NexSens Technology WQ-DO Manual de usuario

For Sales & Service Contact

2650 E. 40th Ave. • Denver, CO 80205

Phone 303-320-4764 • Fax 303-322-7242

1-800-833-7958

www.geotechenv.com

NexSens Technology, Inc.

WQSensors User’s Manual 2

TABLE OF CONTENTS

1Sensor Operation................................................................................................................3

1.1 Dissolved Oxygen & Temperature Sensors..................................................................3

1.1.1 WQ-DO – Dissolved Oxygen & Temperature Sensor.......................................................................3

1.1.2 Making DO Sensor Measurements...................................................................................................4

1.1.3 Maintenance and Care ...................................................................................................................10

1.1.4 Dissolved Oxygen Troubleshooting Guide.....................................................................................12

2Software Operation...........................................................................................................13

2.1 Working with Data ....................................................................................................13

2.2 Data Validation and Review ......................................................................................17

2.3 Changing Software Settings.......................................................................................19

2.4 Science Library..........................................................................................................21

2.5 Help and Support.......................................................................................................22

2.6 Working with Project Files ........................................................................................23

Appendix ..................................................................................................................................25

Appendix A: Material Safety Data Sheets..............................................................................25

Appendix B: Warranty and Service .......................................................................................25

Appendix C: Computer Requirements...................................................................................26

Appendix D: Step-by-Step Driver Installation .......................................................................26

What is a WQSensor?

WQSensors offer the latest in smart sensor technology with direct computer interface. An

integral USB connector offers a simple, hassle-free connection without meters, batteries, or

power supplies - displaying the data in real-time directly onto the PC. Common water

quality parameters include: temperature, dissolved oxygen, pH, ORP, NO3, NH4, and Cl.

Every sensor ships with WQSensor Software, which offers a simple graphical interface to the

smart sensors. The software includes the popular NexSens SCIENCE LIBRARY with an

interactive periodic table, unit converter, and other useful science utilities. Download a FREE

copy today!

Software Installation

WQSensor Software is distributed on CD-ROM. The setup program starts automatically when

the CD is inserted. If the program does not load automatically, you can manually start the setup

process by running Setup.exe from the CD ROM drive. We suggest that you accept the default

options presented by the WQSensor Software setup program.

Uninstalling WQSensors Software

If you need to uninstall WQSensor Software, click Settings in the Start Menu. Select Control

Panel, followed by Add / Remove Programs. Follow the step-by-step instructions to remove

WQSensor Software and all associated files.

NexSens Technology, Inc.

WQSensors User’s Manual 3

1Sensor Operation

1.1Dissolved Oxygen & Temperature Sensors

1.1.1 WQ-DO – Dissolved Oxygen & Temperature Sensor

WQSensor probes come ready to go out of the box. Accessories and maintenance items may be

purchased from a NexSens Technology dealer:

http://www.nexsens.com/company/where_to_buy.htm

WQ-DO Sensor

Based on the US EPA approved method (360.1), this

polarographic WQSensor is designed for laboratory accuracy.

Probe maintenance is minimal and simple with a screw-on cap

membrane. An integral temperature sensor automatically

compensates dissolved oxygen readings for sample temperature.

An internally stored unique ID and GLP file ensures quality data

and tracks calibration and sensor status.

Dissolved Oxygen Package Includes:

WQ-DO: Dissolved oxygen & temperature sensor with

6 feet of cable and integral USB connector

Dissolved Oxygen storage bottle

Electrolyte Filling Solution

Polishing Strips

Membrane Cap

WQSensor Software & Knowledge Library CD

WQSensor Quick Start Guide

WQ-DO Sensor Specifications

Concentration Range 0% to 200% (0-20mg/L) O2

Temperature Range 0 to 50°C

Temperature Accuracy ± 0.2°C

DO Response Time 98% of full response in 60 seconds

at 25°C

DO Reproducibility ±2%

Electrode length 150 mm

Body Diameter 12 mm

Cap Membrane 16 mm OD x

30 mm L

Size:

Cable Length 6 ft.

NexSens Technology, Inc.

WQSensors User’s Manual 4

1.1.2 Making DO Sensor Measurements

Preparing DO Sensors for Measurements

Note: When preparing the sensor, be careful not to touch the membrane with your fingers.

The oils on your skin can affect the dissolution of oxygen through the membrane and in turn

affect the readings of the sensor.

1. Unscrew Membrane Cartridge at the bottom of the electrode.

2. Rinse the Membrane Cartridge with distilled water; blot dry.

3. Rinse the internal anode/cathode element with distilled water, blot dry.

4. Fill Membrane Cartridge with the provided DO Electrolyte solution

5. Replace the filled Membrane Cartridge. Finger-tighten until snug. Do not over tighten.

Rinse the assembled electrode with distilled water.

6. Place the electrode in the electrode holder. Immerse the tip of the electrode in de-ionized

water and stir the water for 5 minutes. This will properly clean the electrode

NexSens Technology, Inc.

WQSensors User’s Manual 5

Making Dissolved Oxygen Measurements

The quality of results depends on the quality and accuracy of the measurement technique and

standards used. The following guidelines are recommended.

1. After plugging the sensor in, allow the probe at least 15 to 30 minutes before calibrating

or measuring. Polarographic probes, such as the WQ-DO sensor, need time to warm up

to ensure proper polarization of the electrodes.

2. To ensure that the membrane has no air bubbles in the electrolyte solution, always

prepare the sensor as stated in the preparation section above. The membrane caps are

designed to release all air while the module is being installed.

3. Do not allow any air bubbles to be trapped on the exterior membrane surface, as it will

read an air bubble as an oxygen-saturated sample.

4. Calibrate your electrode at temperatures close to the sample temperature even though

automatic temperature compensation (ATC) is used. The temperature sensor on the side

of the sensor, if submerged, can be used to the sample temperature. This will reduce the

error margin.

5. It is important during measurement to stir the solution, as oxygen consumption by the

probe can momentarily reduce the oxygen concentration at the probe surface. Stirring

can be done manually or with a stir plate. The Micro-stirrer (WQ-STIR) snaps onto any

WQ-sensor and is a convenient way to provide motion near the probe surface.

6. Membranes wear out over time. The life of the membrane will depend on the

environment in which it is used. Check regularly for any punctures, tears, or fouling

residue.

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WQSensors User’s Manual 6

NexSens Technology, Inc.

WQ Sensor User’s Manual 7

Calibrating Dissolved Oxygen Sensors

The WQ-DO sensor requires only a 1-point calibration. Calibration is performed in a 100%

saturated dissolved oxygen environment (Air Calibration) or in a known dissolved oxygen

concentration solution (In-Situ Calibration). In order to ensure proper polarization of the

electrodes, the probe must warm up for 15-30 minutes before calibrating. 30 minutes is

recommended.

The dissolved oxygen sensor should be calibrated as often as possible. Each day before use is

recommended. Calibration drift can be checked by immersing the probe in a 100% saturated

environment. If the value has changed significantly since calibration, recalibrate.

During air calibrations, you will see your 100% saturation value change according to your

corresponding barometric pressure and salinity values. The saturation value falls below 100% at

lower barometric pressures and higher salinities. For instance, when the barometric pressure

drops to 745 mmHg, the “100% saturation value” will drop to around 98%. For the most

accurate readings, salinity and barometric pressure readings can set in the Settings menu.

To see how salinity and temperature affect the Dissolved Oxygen reading, click on the Library

menu, select Environmental and then Dissolved Oxygen Solubility. As you can see, at 25

degrees Celsius the difference of Oxygen in mg/L can differ as much as 1.5mg/L from freshwater

(0 ppt salinity) to salt water (~35 ppt salinity).

NexSens Technology, Inc.

WQ Sensor User’s Manual 8

Air Calibration

The two methods described below may be used to achieve a 100% air-saturated

environment:

Method 1: Fill a clean beaker with distilled water. Bubble air through the water while stirring for

20 minutes. This will saturate the water with air.

Method 2: Place a small amount of distilled water in the calibration bottle. Insert the electrode

into the cap of the bottle. Place the cap on calibration bottle loosely so that it remains vented to

the atmosphere. Allow the electrode to sit in the calibration bottle for 20 minutes. The air in the

bottle will be saturated with water.

Use either Method 1 or 2 to obtain a 100% air-saturated environment for the WQ-DO calibration.

1.) Connect the dissolved oxygen probe to the PC via the USB connector.

2.) Let the dissolved oxygen probe warm up for 15-30 minutes before calibration.

During the warm-up time, place the dissolved oxygen probe in a 100% air-saturated

environment (Method 1 or 2 above).

3.) After the probe has warmed up for 15-30 minutes in a 100% air-saturated

environment, click the Calibrate button and click on the DO Saturation reading.

4.) Enter the barometric pressure reading and click OK to calibrate.

NexSens Technology, Inc.

WQ Sensor User’s Manual 9

In-Situ Calibration

If you have a solution of known dissolved oxygen concentration reading, verified with another

calibrated meter or WQ-DO Sensor, you can calibrate per the mg/L:

1.) Connect the dissolved oxygen probe to the PC via the USB connector.

2.) Let the dissolved oxygen probe warm up for 15-30 minutes before calibration. During

the warm-up time, place the sensor into the known solution and allow the probe to

stabilize.

3.) After the readings are stable, press the ‘Calibrate’ button and click on the mg/L reading.

4.) Enter the known mg/L reading and click the ‘Calibrate’ button again.

If measuring dissolved oxygen in solutions that contain amounts of salinity such as salt water,

make sure the salinity setting is changed in the Settings menu.

NexSens Technology, Inc.

WQ Sensor User’s Manual 10

1.1.3 Maintenance and Care

Sensing Module Assembly

Sensor Storage

Short Term (1-3 days)

The assembled electrode should be stored in a moist environment, such as in the

provided calibration/storage bottle cup or in a beaker of water. When storing in

calibration/storage cup, place a small piece of sponge inside. Moisten sponge with

distilled or de-ionized water.

Long Term:

Completely disassemble the electrode. Rinse the anode/ cathode element and Membrane

Cap with distilled or de-ionized water. Blot dry all of the parts. The Membrane Cap may

be placed on the electrode, but do not tighten. Store all parts securely in the original box.

When ready to use the probe again, follow the instructions in the “Preparing DO Sensors

for Measurement” section.

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