Campbell CS511 Bedienungsanleitung

Revision: 03/2022

Campbell Scientific, Inc.

Table of contents

1. Introduction 1

2. Precautions 1

3. Initial inspection 1

4. QuickStart 2

5. Overview 4

6. Specifications 5

7. Installation 6

7.1 Getting sensor ready to use 7

7.2 Wiring 8

7.3 Programming 8

7.4 Calibration 9

8. Maintenance 10

Appendix A. Importing Short Cut code into CRBasic Editor 13

Appendix B. Example program 14

Appendix C. Dissolved oxygen tables 16

Table of Contents - i

1. Introduction

The CS511 is a rugged, low-maintenance sensor that is manufactured by Sensorex. It consists of a

self-polarizing galvanic cell that generates a millivolt signal proportional to the amount of

oxygen present in the measured medium (typically water).

NOTE:

This manual provides information only for CRBasic data loggers. For retired Edlog data logger

support, see an older manual at www.campbellsci.com/old-manuals . Also refer to an older

manual if the CS511 was purchased before June 2008 and for information on using the retired

PT4-L Agitator.

2. Precautions

lREAD AND UNDERSTAND the Safety section at the back of this manual.

lThe CS511 is a precision instrument. Please handle it with care.

lBecause the CS511 is shipped dry, electrolyte needs to be added before using the sensor.

See Getting sensor ready to use (p. 7) for more information.

lLetting the CS511 dry in the field shortens the life of the membrane and sensor.

lThe sensor should be stored dry and empty. Therefore, empty the electrolyte, rinse the

sensor, and remove the membrane.

lReplace the membrane and recalibrate the sensor before redeploying the CS511 after it has

been stored out of water or dried up in the field.

lWhile cleaning, do not touch the center electrode. See Maintenance (p. 10) for more

information.

3. Initial inspection

lUpon receipt of the CS511 inspect the packaging and contents for damage. File damage

claims with the shipping company.

CS511 Dissolved Oxygen Sensor 1

lImmediately check package contents against the shipping documentation. Contact

Campbell Scientific about any discrepancies.

lThe model number and cable length are printed on a label at the connection end of the

cable. Check this information against the shipping documents to ensure the expected

product and cable length were received.

4. QuickStart

A video that describes data logger programming using Short Cut is available at:

www.campbellsci.com/videos/cr1000x-data logger-getting-started-program-part-3 .Short

Cut is an easy way to program your data logger to measure the sensor and assign data logger

wiring terminals. Short Cut is available as a download on www.campbellsci.com . It is included

in installations of LoggerNet,RTDAQ, and PC400.

The following procedure also shows using Short Cut to program the CS511.

1. Open Short Cut and click Create New Program.

2. Double-click the data logger model.

3. In the Available Sensors and Devices box, type CS511 or locate the sensor in the Sensors >

Water >Quality folder. Double click on the CS511 Dissolved Oxygen Probe. The default

calibration value of 0.34 is based on an average. It is preferable to calibrate the sensor by

using the procedure provided in Calibration (p. 9).

CS511 Dissolved Oxygen Sensor 2

4. Click on the Wiring tab to see how the sensor is to be wired to the data logger. Click OK

after wiring the sensor.

5. In Output Setup, type the scan rate, meaningful table names, and Data Output Storage

Interval. Click Next.

CS511 Dissolved Oxygen Sensor 3

6. Select the measurement and its associated output option.

7. Click Finish and save the program. Send the program to the data logger if the data logger

is connected to the computer.

8. If the sensor is connected to the data logger, check the output of the sensor in the data

display in LoggerNet,RTDAQ, or PC400 to make sure it is making reasonable

measurements.

5. Overview

The CS511 is a galvanic sensor, which produces a millivolt signal proportional to the amount of

oxygen present in the measured medium. Oxygen diffuses through the membrane onto the

cathode, reacts chemically, and combines with the anode. An electrical current is produced by

this chemical reaction which is converted from microamps to millivolts by an in-line resistor. An

in-line thermistor also conditions the signal providing automatic temperature compensation.

With these features, the sensor produces a linear, millivolt output proportional to the oxygen

present in the medium in which it is placed.

The sensor consists of two parts, an upper part with cathode, anode, and cable, and a lower part

comprising of a screw-on membrane cap. The CS511 is shipped dry, but has a membrane

installed in the cap. With the membrane in place, the cap must be filled with electrolyte solution

before the cap is screwed onto the top component.

The CS511 is self-polarizing and requires no external power source.

CS511 Dissolved Oxygen Sensor 4

Features:

lIn-line thermistor provides automatic temperature compensation

lCompatible with Campbell Scientific CRBasic data loggers: CR6, CR1000X, CR800-series,

CR350-series, CR300-series, CR3000, CR1000

6. Specifications

Principle of measurement: Membrane-covered, galvanic oxygen sensor

Output signal: 33 mV ± 9 mV (100% saturation), < 2 mV (0% saturation)

Measurement range: 0.5 to 50 ppm

Accuracy: Better than ± 2% of reading ± 1 digit when calibration

temperature equals measuring temperature ± 5 °C

Response time: 5 min. from 100% to 0% oxygen

Operating conditions

Temperature: 0 to 50 °C (32 to 122 °F)

Pressure: 0 to 100 psig

Minimum submersion depth: 60 mm (2.5 in)

Minimum water flow: 5 cm/s (2 in/s) across membrane

Calibration: In air or in air saturated water

Temperature compensation: Automatic from 4 to 40 °C (40 to 104 °F)

Sensor electrolyte: NaCl + glycerol (prevents freezing)

Materials

Body: Noryl

Anode: Zinc

Cathode: Silver

Cable jacket: PVC

Diameter: 5.72 cm (2.25 in)

Height: 17.78 cm (7 in) from bottom of sensor to end of cable-strain

relief; see Figure 6-1 (p. 6)

Shipping weight: 0.8 kg (1.75 lb) including sensor and shipping kit

CS511 Dissolved Oxygen Sensor 5

Figure 6-1. CS511 dimensions

7. Installation

If you are programming your data logger with Short Cut, skip Wiring (p. 8) and Programming (p.

8). Short Cut does this work for you. See QuickStart (p. 2) for a Short Cut tutorial.

CS511 Dissolved Oxygen Sensor 6

7.1 Getting sensor ready to use

1. Unscrew the lower body from the upper body.

Figure 7-1. Separate the lower body from the upper body

2. Inspect the membrane for wrinkles. Replace membrane if wrinkled. See Maintenance(p.10).

3. Pour clean water into the lower body and look for leakage around the membrane. Dispose

of the water, and if there is leakage, replace membrane. See Maintenance(p.10).

Figure 7-2. Check for leakage

CS511 Dissolved Oxygen Sensor 7

4. Pour fresh electrolyte in the bottom cap and fill to the top of the cap.

5. Keep the sensor upright with the cable pointed upwards (not sideways). Screw the bottom

cap onto the upper body until hand tight.

7.2 Wiring

Data logger connection is provided in following table. The CS511 can use one differential terminal

or one single-ended terminal. Differential wiring is better at rejecting electrical noise and ground

loop error.

Table 7-1: Wire color, function, and data logger connections

Wire

color Wire function Differential

data logger connection

Single-ended

data logger connection

White Signal high

Uconfigured for differential

input1,DIFF H (differential high,

analog-voltage input)

Uconfigured for single-ended

input1,SE (single-ended, analog-

voltage input)

Black Signal reference

Uconfigured for differential

input1,DIFF L (differential low,

analog-voltage input)

⏚(analog ground)

Clear Shield ⏚(analog ground) ⏚(analog ground)

1Uterminals are automatically configured by the measurement instruction.

7.3 Programming

Short Cut is the best source for up-to-date programming code for Campbell Scientific data

loggers. If your data acquisition requirements are simple, you can probably create and maintain a

data logger program exclusively with Short Cut. If your data acquisition needs are more complex,

the files that Short Cut creates are a great source for programming code to start a new program

or add to an existing custom program.

NOTE:

Short Cut cannot edit programs after they are imported and edited in CRBasic Editor.

AShort Cut tutorial is available in QuickStart (p. 2). If you wish to import Short Cut code into

CRBasic Editor to create or add to a customized program, follow the procedure in Importing

Short Cut code into CRBasic Editor (p. 13). This document provides programming basics for

CRBasic data loggers. A complete program is provided in Example program (p. 14).

CS511 Dissolved Oxygen Sensor 8

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