Campbell CS511 Manual de usuario
Revision: 03/2022
Copyright © 2001– 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
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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