Campbell OXYGUARD TYPE III CS512 Manual de usuario

Campbell Scientific CS512

Oxyguard Type III

Dissolved Oxygen Probe

Revision: 12/06

Campbell Scientific, Inc.

Warranty and Assistance

The CS512 OXYGUARD TYPE III DISSOLVED OXYGEN PROBE is

warranted by CAMPBELL SCIENTIFIC, INC. to be free from defects in

materials and workmanship under normal use and service for twelve (12)

months from date of shipment unless specified otherwise. Batteries have no

warranty. CAMPBELL SCIENTIFIC, INC.'s obligation under this warranty is

limited to repairing or replacing (at CAMPBELL SCIENTIFIC, INC.'s option)

defective products. The customer shall assume all costs of removing,

reinstalling, and shipping defective products to CAMPBELL SCIENTIFIC,

INC. CAMPBELL SCIENTIFIC, INC. will return such products by surface

carrier prepaid. This warranty shall not apply to any CAMPBELL

SCIENTIFIC, INC. products which have been subjected to modification,

misuse, neglect, accidents of nature, or shipping damage. This warranty is in

lieu of all other warranties, expressed or implied, including warranties of

merchantability or fitness for a particular purpose. CAMPBELL SCIENTIFIC,

INC. is not liable for special, indirect, incidental, or consequential damages.

Products may not be returned without prior authorization. The following

contact information is for US and International customers residing in countries

served by Campbell Scientific, Inc. directly. Affiliate companies handle

repairs for customers within their territories. Please visit

www.campbellsci.com to determine which Campbell Scientific company

serves your country. To obtain a Returned Materials Authorization (RMA),

contact CAMPBELL SCIENTIFIC, INC., phone (435) 753-2342. After an

applications engineer determines the nature of the problem, an RMA number

will be issued. Please write this number clearly on the outside of the shipping

container. CAMPBELL SCIENTIFIC's shipping address is:

CAMPBELL SCIENTIFIC, INC.

RMA#_____

815 West 1800 North

Logan, Utah 84321-1784

CAMPBELL SCIENTIFIC, INC. does not accept collect calls.

CS512 Table of Contents

PDF viewers note: These page numbers refer to the printed version of this document. Use

the Adobe Acrobat® bookmarks tab for links to specific sections.

1. General Information.....................................................1

2. Specifications ..............................................................2

3. Optional Probe Accessories.......................................3

4. Optional Agitator .........................................................3

5. Application Information ..............................................4

6. Wiring............................................................................4

7. Programming ...............................................................5

8. Calibration....................................................................6

9. Maintenance.................................................................7

10. Agitator Control.........................................................7

Appendix

A. Dissolved Oxygen in Fresh Water Table...............A-1

Figures

1-1. CS512......................................................................................................1

4-1. Preventing Bio-fouling of the CS512......................................................3

4-2. CS512 with PT4 Agitator........................................................................4

10-1. Agitator Wiring.....................................................................................7

Table

6-1. Sensor Wiring..........................................................................................4

CS512 Table of Contents

Examples

1. Sample Program using P1.......................................................................... 5

2. Sample Program using P2.......................................................................... 5

3. Sample Program using VoltSE .................................................................. 5

4. Sample Program using VoltDiff ................................................................ 5

5. Sample Program using VoltSE .................................................................. 5

6. Sample Program using P36........................................................................ 6

7. Sample Program using Expression ............................................................ 6

8. Sample Program using P86 and P22 Instructions ...................................... 8

9. Sample Program using Portset................................................................... 8

10. Sample Program using Portset................................................................. 8

Campbell Scientific CS512 Oxyguard

Type III Dissolved Oxygen Probe

An accurate and reliable sensor is a critical element in any measurement system. The

Oxyguard Stationary Probe meets these criteria for the measurement of dissolved oxygen.

1. General Information

The Oxyguard Stationary Probe is a galvanic probe 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 probe produces a millivolt output

proportional to the oxygen present in the medium in which it is placed. The probe

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

comprising a screw on membrane cap with fitted membrane. The cap is filled with

electrolyte and simply screwed onto the top component.

The probe is self-polarizing and requires no external power source. There are two

wires to connect.

Because the probe's output is linear, it is possible to connect it directly to a data

acquisition system capable of handling the small millivolt signal.

The probe's robust construction and simple design make maintenance and

servicing it straightforward. There is no need to send the probe back to the factory

for servicing. It utilizes a strong, easy-to-clean and easy-to-change membrane in a

screw-on membrane cap. Regular servicing is not required. When necessary the

probe can be fully overhauled in five minutes.

FIGURE 1-1. CS512

Campbell Scientific CS512 Oxyguard Type III Dissolved Oxygen Probe

2. Specifications

Principle of Measurement: Membrane covered galvanic oxygen probe

Output Signal: 2.5 to 5 mV per mg 1-1

Repeatability: Better than ±0.2 mg/l calibration temperature

equals measuring temperature ±5°C

Output Impedance: ∼1 kohm

Response Time: After equilibration, 1 minute for 95% of final

value

Materials of Construction:

Probe body:

O-rings:

Membrane:

Delrin

Membrane O-ring = Buna N

Body Seal O-ring = Viton

0.05 mm (2 mil) Teflon

Dimensions and Weight: 2.28” diameter x 2.3” height

15.9 oz.

Cable: standard length 7 m (23 ft); other lengths

available upon request

2-wire 22 awg shielded, PVC jacketed

Operating Conditions:

Temperature

Pressure:

Minimum Submersion Depth:

Minimum Water Flow:

0°to 40°C (32°to 122°F)

0 to 29 psig

60 mm (2 ½ in)

1 cm/s (.39 in/sec) across membrane

Calibration: In air or in air saturated water

Temperature Compensation: Automatic from 4°- 40°C (40°- 104°F)

Range of Dissolved Oxygen: 0-20 mg/l, 0-200% Sat

Ships with: 5 spare membranes with O-rings

50 ml electrolyte

cathode cleaning pad

Campbell Scientific CS512 Oxyguard Type III Dissolved Oxygen Probe

3. Optional Probe Accessories

PT4-L — Agitator for stagnant conditions

18026 — DO electrolyte, 1 liter

18027 — Membrane kit, 10 membranes

4. Optional Agitator

The PT4 Agitator is a reliable and robust agitator for use in conjunction with

probes subjected to bio-fouling in ponds and stagnant water conditions.

O2probes require a minimum water velocity across their membranes to function

properly. Therefore, to measure DO in stagnant water conditions, it is necessary to

move the water past the membrane to get accurate and reliable DO measurements.

In many instances the water also has a high bio-loading and the probes become

fouled resulting in inaccurate DO measurements.

FIGURE 4-1. Preventing Bio-fouling of the CS512

The PT4 Agitator overcomes these problems. The device is designed so that a soft

bristle brush sweeps across the probe membrane or sensor tip. This sweeping

action of the brush provides the required water velocity as well as prevents the

membrane from becoming bio-fouled.

The optimum sweeping frequency depends upon the design of probe and type of

membrane used and water conditions. An ON-time of 0.25 seconds and OFF-time

of 5 seconds is suitable in most circumstances.

Agitator’s overall size: 7-1/8" x 3-1/4" diameter, 1-1/4 lb. (180mm x 83mm, 0.6 kg)

Supplied with 10 ft. (3 meters) cable.

Power required: 10.5 to 18 VDC at the agitator, 1.1 amps. Maximum ON-time is

3 seconds.

Campbell Scientific CS512 Oxyguard Type III Dissolved Oxygen Probe

FIGURE 4-2. CS512 with PT4 Agitator

Optional Repeat Cycle Timer for Agitators: Reciprocating action may be

controlled by the optional solid state Repeat Cycle Timer. It sends 12 VDC pulses

to the agitator coil. The ON-time is 0.25 sec. The OFF-time is adjustable from 3

to 12 sec.; requires supply voltage 10 to 17 VDC; housed in watertight cylinder

6.6" x 2" diameter (170 mm X 50 mm).

5. Application Information

SCWin users: This manual was written primarily for those

whose needs are not met by SCWin. Your procedure is much

simpler: just add the CS512 probe (it’s in the water folder), save

your program, and follow the wiring shown in Step 2 of SCWIN.

6. Wiring

The CS512 probe can use one differential channel or one single-ended channel.

Differential wiring is better at rejecting electrical noise and ground loop error.

TABLE 6-1. Sensor Wiring

Colo

Functio

CR510, CR10X, CR800, CR850,

CR23X, CR1000, CR3000

CR200 Series

Whit

e Signal + Differential High,

or Single-Ended Channel Single-Ended

Channel

Blue Signal - Differential Low or AG Ground

NOTE

Campbell Scientific CS512 Oxyguard Type III Dissolved Oxygen Probe

7. Programming

In the CR510, CR10X, and CR23X datalogger, Instruction P1 or P2 can be used.

Example 1 uses a single-ended measurement for the CS512 probe; example 2 uses

a differential measurement. The example measurement instructions that follow do

not store data to final storage. Additional instructions (typically P92, P77, and

output processing instructions such as P70) are required to store data permanently.

EXAMPLE 1. Sample Program using P1

1: Volt (SE) (P1)

1: 1 Reps

2: 24 250 mV 60 Hz Rejection Range ; code 23 used for CR23X

3: 1 SE Channel

4: 1 Loc [ DOmV ]

5: 1.0 Multiplier *See Calibration*

6: 0.0 Offset

EXAMPLE 2. Sample Program using P2

1: Volt (Diff) (P2)

1: 1 Reps

2: 24 250 mV 60 Hz Rejection Range ; code 23 used for CR23X

3: 1 DIFF Channel

4: 1 Loc [ DOmV ]

5: 1.0 Multiplier *See Calibration*

6: 0.0 Offset

In the CR1000, CR800, CR850, and CR3000 dataloggers, instruction VoltDiff

or VoltSE is used to measure the CS512 probe.

EXAMPLE 3. Sample Program using VoltSE

VoltSE (DOmV,1,mV250,1,1,0,_60Hz,1.0,0)

EXAMPLE 4. Sample Program using VoltDiff

VoltDiff (DOmV,1,mV250,1,True ,0,_60Hz,1.0,0)

In the CR200 series dataloggers, only the instruction VoltSE is used to

measure the CS512 probe.

EXAMPLE 5. Sample Program using VoltSE.

VoltSE (DOmV,1,1,1.0,0)

Campbell Scientific CS512 Oxyguard Type III Dissolved Oxygen Probe

8. Calibration

The multiplier is used to calibrate the CS512 probe. To calculate the multiplier:

1) Program the datalogger using a multiplier of one.

2) Place the OxyGuard probe in the air, shaded from the sun. Wait for readings

to stabilize. This may take 15 minutes or more.

3) Determine the air temperature and barometric pressure.

4) Using a calibration chart such as that provided in the probe’s manual,

determine the oxygen concentration of the air.

5) Use the following equation to calculate the multiplier:

M = P/R

M = Multiplier

P = Concentration in PPM of the air (from the calibration chart in Appendix A)

R = The signal output of the OxyGuard probe when using a multiplier of one

6) Change the multiplier in the datalogger program from one to the calculated

number.

A more common way to enter the multiplier is to insert a separate instruction in

the program. This will allow a new multiplier to be added to the program

without rewriting, compiling, and downloading the program to the data logger.

In the CR510, CR10X, and CR23X, use Instruction P36. The multiplier is

entered into an input location called DOmult using the numeric display in

PC200W, PC208W, LoggerNet, PC400, PConnect, PConnectCE, or the

CR10KD.

EXAMPLE 6. Sample Program using P36

57: Z=X*Y (P36)

1: 1 X Loc [ DOmV ]

2: 2 Y Loc [ DOmult ]

3: 3 Z Loc [ DOppm ]

In all dataloggers that use CRBasic, an expression is written. The multiplier

value is entered into the expression through the Public Table using the numeric

display in PC200W, LoggerNet, PC400, PConnect, and PConnectCE.

EXAMPLE 7. Sample Program using Expression

DOppm = DOMult * DOmV

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