CS511-L Dissolved
Oxygen Probe
Revision: 1/13
Copyright © 2001-2013
Campbell Scientific, Inc.
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Table of Contents
PDF viewers: These page numbers refer to the printed version of this document. Use the
PDF reader bookmarks tab for links to specific sections.
1. Introduction.................................................................1
2. Cautionary Statements...............................................2
3. Initial Inspection .........................................................2
3.1 Shipping Kit and Accessories ..............................................................2
3.1.1 Shipping Kit..................................................................................2
3.1.2 Optional Probe Accessories ..........................................................2
4. Quickstart .................................................................... 3
4.1 Getting Probe Ready to Use.................................................................3
4.2 Use SCWin to Program Datalogger and Generate Wiring Diagram....5
4.3 Mount Probe.........................................................................................8
5. Overview......................................................................8
6. Specifications .............................................................9
7. Operation...................................................................11
7.1 Wiring ................................................................................................11
7.2 Programming......................................................................................11
7.2.1 CRBasic ......................................................................................11
7.2.1.1 Example CR1000 Program Using VoltDiff......................12
7.2.1.2 Example CR200(X) Program ...........................................13
7.2.2 Edlog...........................................................................................14
7.2.2.1 Portion of CR10X Sample Program Using P1 .................14
7.2.2.2 Portion of CR10X Sample Program Using P2 .................14
7.3 Calibration..........................................................................................14
8. Maintenance ..............................................................16
8.1 Cleaning Probe and Replacing the Membrane ...................................16
Appendices
A.
Dissolved Oxygen Tables ...................................... A-1
i
Table of Contents
B. Sensorex’s Model DO6200/T ..................................B-1
B.1 DO6200/T Specifications ................................................................ B-1
B.2 Accessories for DO6200/T .............................................................. B-2
C. PT4-L Agitator .........................................................C-1
C.1 Description ...................................................................................... C-1
C.2 PT4-L Specifications....................................................................... C-2
C.3 Agitator Control .............................................................................. C-2
Figures
1-1. The CS511-L is currently Sensorex’s DO6400/T (left). The
DO6200/T (right) was shipped prior to June 2008 (refer to
Appendix B)..................................................................................... 1
8-1. Separate the lower body from the upper body................................... 16
8-2. Remove membrane and O-ring.......................................................... 17
8-3. Using a toothbrush to clean probe..................................................... 18
8-4. Proper O-ring placement ................................................................... 19
8-5. Installing membrane .......................................................................... 20
8-6. Check for leakage.............................................................................. 21
B-1. Sensorex’s model DO6200/T .......................................................... B-1
C-1. Preventing Bio-fouling of a DO Sensor........................................... C-1
C-2. DO sensor with PT4 Agitator .......................................................... C-2
C-3. Agitator Wiring ............................................................................... C-3
Tables
7-1. Sensor Wiring.................................................................................... 11
7-2. Wiring for Example 1........................................................................ 12
7-3. Wiring for Example 2........................................................................ 13
ii
CS511-L Dissolved Oxygen Probe
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).
Before installing the CS511, please study
• Section 2, Cautionary Statements
• Section 3, Initial Inspection
• Section 3.1, Quickstart
NOTE
DO6400/T
Currently, the CS511 is Sensorex’s Model DO6400/T. Prior to
June 2008, the CS511 was Sensorex’s Model DO6200/T.
Programming, wiring, and most specifications are the same for
these two sensors. However, they use different accessories and
look different (see FIGURE 1-1). Refer to Appendix B if you
have Sensorex’s Model DO6200/T.
DO6200/T
FIGURE 1-1. The CS511-L is currently Sensorex’s DO6400/T (left).
The DO6200/T (right) was shipped prior to June 2008 (refer to
Appendix B).
1
CS511-L Dissolved Oxygen Probe
2. Cautionary Statements
• The CS511 is a precision instrument. Please handle it with care.
• Because the CS511 is shipped dry, electrolyte needs to be added before
using the probe (see Section 4.1, Getting Probe Ready to Use).
• Letting the CS511 dry up shortens the life of the membrane and probe.
• Drain the solution from the CS511 before storing it out of water.
• Replace the membrane and recalibrate the probe before redeploying the
CS511 after it has been stored out of water or dried up in the field.
3. Initial Inspection
• Upon receipt of the CS511, inspect the packaging and contents for
damage. File damage claims with the shipping company.
• Immediately check package contents against the shipping documentation
(see Section 3.1, Shipping Kit and Accessories). Contact Campbell
Scientific about any discrepancies.
• The 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 are received.
3.1 Shipping Kit and Accessories
NOTE
3.1.1 Shipping Kit
3.1.2 Optional Probe Accessories
Except for the agitator, these items are for Sensorex’s
DO6400/T. Refer to Appendix B if you have a DO6200/T.
(1) Membrane replacement tool
(1) Bottled DO electrolyte, 250 ml
(2) Teflon membranes
(2) Membrane O-rings
(2) Membrane spaces
• PT4─L Agitator with Repeat Cycle Timer for stagnant conditions (see
Appendix C)
• 22261 Maintenance Kit containing (5) Teflon membranes, (5) membrane
O-rings, (5) tensioning washers, and a 250-ml bottle of electrolyte
2
• 22262 Maintenance Kit containing (25) Teflon membranes, (25) membrane
O-rings, (25) tensioning washers, and a 500-ml bottle of electrolyte
• 22263 Spare Parts Kit containing (2) membrane locks, (2) tensioning
washers, (2) body O-rings, and (1) membrane-replacement tool
4. Quickstart
4.1 Getting Probe Ready to Use
CS511-L Dissolved Oxygen Probe
Please review Section 7, Operation, for wiring, programming, and calibration
information.
1. Unscrew the lower body from the upper body.
2. Inspect the membrane for wrinkles. Replace membrane if wrinkled (see
Section 8.1, Cleaning Probe and Replacing the Membrane).
3
CS511-L Dissolved Oxygen Probe
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 Section 8.1, Cleaning Probe and Replacing the
Membrane).
Water
NOTE
4. Pour fresh electrolyte in the bottom cap and fill to the top of the cap.
5. Keep the probe upright with the cable pointed upwards (not sideways).
Screw the bottom cap onto the upper body until hand tight.
Excess electrolyte will leak out at the joint between the probe’s
cap and upper body.
4
CS511-L Dissolved Oxygen Probe
4.2 Use SCWin to Program Datalogger and Generate Wiring Diagram
The simplest method for programming the datalogger to measure the 034B is to
use Campbell Scientific’s SCWin Program Generator.
1. Open Short Cut and click on New Program.
2. Select the datalogger and enter the scan interval.
5
CS511-L Dissolved Oxygen Probe
3. Select CS511 Dissolved Oxygen Probe, and select the right arrow (in
center of screen) to add it to the list of sensors to be measured, and then
select Next.
4. Define the name of the public variables and enter the calibration
multiplier. Variables default to DOmv for the millivolt measurements and
DOppm for the ppm values. The default calibration value of 0.34 is based
on an average. It is preferable to calibrate the probe using the procedure
provided in Section 7.3, Calibration. After entering the information, click
on OK, and then select Next.
6
CS511-L Dissolved Oxygen Probe
5. Choose the outputs and then select Finish.
6. In the Save As window, enter an appropriate file name and select Save.
7. In the Confirm window, click Yes to download the program to the
datalogger.
8. Click on Wiring Diagram and wire according to the wiring diagram
generated by SCWin Short Cut.
NOTE
Campbell Scientific also recommends connecting the shield wire
to ground.
7
CS511-L Dissolved Oxygen Probe
4.3 Mount Probe
Mount the CS511 in water at a slight angle, which prevents bubbles from
becoming trapped on the membrane.
5. Overview
The CS511 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 linear, 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 of a screw-on membrane cap. The probe 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 probe is self-polarizing and requires no external power source.
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 uses a strong, easy-to-clean, and easy-to-change
8
membrane in a screw-on membrane cap. Regular servicing is not required.
When necessary, the probe can be fully overhauled in five min.
The CS511’s cable can terminate in:
6. Specifications
Features:
CS511-L Dissolved Oxygen Probe
• Pigtails that connect directly to a Campbell Scientific datalogger
(option –PT).
• Connector that attaches to a prewired enclosure (option –PW). Refer
to www.campbellsci.com/prewired-enclosures for more information.
• Connector that attaches to a CWS900 Wireless Sensor Interface
(option –CWS). The CWS900 allows the probe to be used in a
wireless sensor network. Refer to www.campbellsci.com/cws900 for
more information.
• In-line thermistor provides automatic temperature compensation
• Agitator available that keeps the probe clean and moves water across
membrane for more accurate readings
• Compatible with all Campbell Scientific dataloggers
Compatible Dataloggers: CR200(X)-series
CR800 series
CR1000
CR3000
CR5000
CR9000X
CR510
CR10(X)
CR23X
CR7
21X
Principle of Measurement:
Output Signal:
Accuracy:
Response Time:
Materials of Construction:
Body:
Anode:
Cathode:
Membrane-covered, galvanic oxygen probe
33 mV ± 9 mV (100% saturation),
< 2 mV (0% saturation)
Better than ± 2% of reading ± 1 digit when
calibration temperature equals measuring
temperature ± 5°C
5 min. from 100% to 0% oxygen
Noryl
Silver
Zinc
Diameter:
Height:
5.72 cm (2.25 in)
17.78 cm (7 in) from bottom of sensor to end
of cable-strain relief
9
CS511-L Dissolved Oxygen Probe
Shipping Weight
Cable Jacket Material:
Operating Conditions:
Temperature
Pressure:
Minimum Submersion Depth:
Minimum Water Flow:
Calibration:
Temperature Compensation:
Range of Dissolved Oxygen:
Probe Electrolyte:
red wire (+)
flexible cable
strain relief
black wire (-)
black waterproof
cable (10ft length standard)
0.8 kg (1.75 lb)
PVC
0° to 50°C (32° to 122°F)
0 to 100 psig
60 mm (2.5 in)
5 cm/s (2 in/sec) across membrane
In air or in air saturated water
Automatic from 4° to 40°C (40° to 104°F)
0.5 to 50 ppm
NaCl + glycerol (prevents freezing)
Noryl Body
0.99”
(25.1mm)
2.25”
(57.2mm)
7.00"
(177.8mm)
10
7. Operation
7.1 Wiring
CS511-L Dissolved Oxygen Probe
The CS511 can use one differential channel or one single-ended channel.
Differential wiring is better at rejecting electrical noise and ground loop error.
TABLE 7-1. Sensor Wiring
Color
White Signal + Differential High,
Black Signal - Differential Low or AG Ground
Clear Shield Ground Ground
7.2 Programming
NOTE
7.2.1 CRBasic
This section describes using CRBasic or Edlog to program the
datalogger. See Section 4.2, Use SCWin to Program Datalogger
and Generate Wiring Diagram, if using Short Cut.
Dataloggers that use CRBasic include the CR200(X)-series, CR800, CR850,
CR1000, CR3000, and CR5000. Dataloggers that use Edlog include the
CR510, CR10X, and CR23X. CRBasic and Edlog are included with
LoggerNet and PC400 software.
Function
CR510, CR10X, CR800,
CR850, CR23X, CR1000,
CR3000, CR5000
or Single-Ended Channel
CR200(X)-Series
Single-Ended Channel
In the CR800, CR850, CR1000, CR3000, and CR5000, VoltDiff() or VoltSE()
can be used to measure the CS511. In the CR200(X)-series dataloggers, only
the VoltSE() instruction can be used since these dataloggers do not support
differential measurements. Example programs are provided in Section 7.2.1.1,
Example CR1000 Program Using VoltDiff, and Section 7.2.1.2, Example
CR200(X) Program.
11
CS511-L Dissolved Oxygen Probe
7.2.1.1 Example CR1000 Program Using VoltDiff
This example is a CR1000 program but programming for the CR800, CR850,
CR3000, and CR5000 is similar. TABLE 7-2 shows the wiring for the
example.
TABLE 7-2. Wiring for CR1000 Example
CR1000 Connection Sensor Wire
1H White
1L Black
Ground Clear
'CR1000
'Declare Variables and Units
Public Batt_Volt
Public DOmV
Public DOppm
Units Batt_Volt=Volts
Units DOmV=mV
Units DOppm=ppm
'Define Data Tables
DataTable(Table1,True,-1)
DataInterval(0,60,Min,10)
Sample(1,DOmV,FP2)
Sample(1,DOppm,FP2)
Sample(1,Batt_Volt,FP2)
EndTable
DataTable(Table2,True,-1)
DataInterval(0,1440,Min,10)
Minimum(1,Batt_Volt,FP2,False,False)
EndTable
'Main Program
BeginProg
Scan(5,Sec,1,0)
'Default Datalogger Battery Voltage measurement Batt_Volt:
Battery(Batt_Volt)
'CS511 Dissolved Oxygen Probe measurements DOmV and DOppm:
VoltDiff(DOmV,1,mV250,1,True,0,_60Hz,1,0)
DOppm=DOmV*0.34
'Call Data Tables and Store Data
CallTable(Table1)
CallTable(Table2)
NextScan
EndProg
12
CS511-L Dissolved Oxygen Probe
7.2.1.2 Example CR200(X) Program
The CR200(X)-series must use the VoltSE() instruction since these dataloggers
do not make differential measurements. If the other CRBasic dataloggers use
the VoltSE() instruction instead of the VoltDiff() instruction, their
programming will be similar to this example. TABLE 7-3 shows the wiring for
the example.
TABLE 7-3. Wiring for CR200(X) Example
CR200(X) Connection Sensor Wire
SE1 White
Ground Black
Ground Clear
'CR200(X) Series
'Declare Variables and Units
Public Batt_Volt
Public DOmV
Public DOppm
Units Batt_Volt=Volts
Units DOmV=mV
Units DOppm=ppm
'Define Data Tables
DataTable(Table1,True,-1)
DataInterval(0,60,Min)
Sample(1,DOmV)
EndTable
DataTable(Table2,True,-1)
DataInterval(0,1440,Min)
Minimum(1,Batt_Volt,False,False)
EndTable
'Main Program
BeginProg
Scan(10,Sec)
'Default Datalogger Battery Voltage measurement Batt_Volt:
Battery(Batt_Volt)
'CS511 Dissolved Oxygen Probe measurements DOmV and DOppm:
VoltSE(DOmV,1,1,1,0)
DOppm=DOmV*0.34
'Call Data Tables and Store Data
CallTable(Table1)
CallTable(Table2)
NextScan
EndProg
13
CS511-L Dissolved Oxygen Probe
7.2.2 Edlog
In Edlog, P1 is used for single-ended measurements, and P2 is used for differential
measurements. Section 7.2.2.1, Portion of CR10X Sample Program Using P1,
and Section 7.2.2.2, Portion of CR10X Sample Program Using P2, provide
examples.
7.2.2.1 Portion of CR10X Sample Program Using P1
NOTE
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
7.2.2.2 Portion of CR10X Sample Program Using P2
NOTE
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
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.
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.
14
7.3 Calibration
The multiplier is used to calibrate the CS511 probe. To calculate the multiplier:
1) Program the datalogger using a multiplier of one (see Section 4.2, Use SCWin
to Program Datalogger and Generate Wiring Diagram, or Section 7.2,
Programming).
2) Wire the CS511 to the datalogger (see wiring diagram generated by SCWin
or see Section 7.1, Wiring).
3) If the CS511 has been deployed in the field, gently wipe the membrane with a
soft cloth.
CS511-L Dissolved Oxygen Probe
4) Place the CS511 in air away from direct sunlight with the membrane facing
upward.
5) Place a drop of clean water on the membrane.
6) Wait for readings to stabilize. This may take 15 minutes or more.
7) Determine the air temperature and barometric pressure.
8) Using a calibration chart such as that provided in Appendix A, determine the
oxygen concentration of the air.
9) Use the following equation to calculate the multiplier:
M = P/R
where:
M = Multiplier
P = Concentration in PPM of the air (from the calibration chart)
R = The signal output of the probe when using a multiplier of one
10) Change the multiplier in the datalogger program from one to the calculated
number (see Section 4.2, Use SCWin to Program Datalogger and Generate
Wiring Diagram, or Section 7.2, Programming).
Instead of step 10, the multiplier can be entered using 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 datalogger.
For this method, CRBasic dataloggers can use the following expression. The
multiplier value is entered into the expression through the Public Table using
the numeric display in PC200W, LoggerNet, PC400, PConnect, PConnectCE,
or datalogger keyboard display.
CRBasic Expression for Entering Multiplier:
DOppm = DOMult * DOmV
Edlog dataloggers use Instruction 36. The multiplier is entered into an input
location called DOmult using the numeric display in PC200W, PC208W,
LoggerNet, PC400, PConnect, PConnectCE, or the datalogger keyboard
display.
Edlog Instruction 36 for Entering Multiplier:
57: Z=X*Y (P36)
1: 1 X Loc [ DOmV ]
2: 2 Y Loc [ DOmult ]
3: 3 Z Loc [ DOppm ]
15
CS511-L Dissolved Oxygen Probe
8. Maintenance
The only maintenance required is regular cleaning and replacement of the
membrane (see below).
8.1 Cleaning Probe and Replacing the Membrane
1. Unscrew the lower body from the upper body (FIGURE 8-1).
16
FIGURE 8-1. Separate the lower body from the upper body
2. Safely dispose of the electrolyte. Make sure the cap’s O-ring does not fall
out of the cap.
CS511-L Dissolved Oxygen Probe
3. Using the membrane tool, unscrew the membrane lock that is in the lower
body (see FIGURE 8-2).
4. Remove and dispose of the membrane and its O-ring as show in FIGURE
8-2.
Membrane Tool
Membrane Lock
Spacer
Membrane
Membrane O-ring
Cap O-ring
FIGURE 8-2. Remove membrane and O-ring
17
CS511-L Dissolved Oxygen Probe
5. To clean, immerse the top part of the sensor in distilled white vinegar (3%
acetic acid) for about 30 min. If vinegar is unavailable, use a soft
toothbrush, automatic dishwasher detergent, and clean water to clean the
cathode, anode, and plastic. Rinse all components thoroughly with clean
water after cleaning (see FIGURE 8-3).
18
FIGURE 8-3. Using a toothbrush to clean probe
CS511-L Dissolved Oxygen Probe
6. Replace the membrane and its O-ring by first placing the new O-ring at the
very bottom of the membrane cavity (see FIGURE 8-4). Remove the
paper backing from a new membrane and place the new membrane on top
of the O-ring, and then place the spacer on top of the membrane. Using
the membrane tool, install the membrane lock on top of the spacer as
shown in FIGURE 8-5. Make sure the cap is upright (not sideways) when
securing the membrane lock to the spacer.
FIGURE 8-4. Proper O-ring placement
19
CS511-L Dissolved Oxygen Probe
Membrane Tool
Membrane Lock
Spacer
Membrane
O-ring
FIGURE 8-5. Installing membrane
7. Inspect the membrane for wrinkles; replace membrane if wrinkled.
20
CS511-L Dissolved Oxygen Probe
8. Pour some clean water into the lower body and look for leakage around the
membrane (see FIGURE 8-6); replace membrane if there is leakage. If
there is no leakage, dispose of the water.
Water
NOTE
FIGURE 8-6. Check for leakage
9. Pour fresh electrolyte in the bottom cap and fill to the top of the cap.
10. Keep the sensor upright so that the cable is pointed upwards (not
sideways). Screw the bottom cap onto the upper body until hand tight.
Excess electrolyte will leak out at the joint between the sensor’s
cap and upper body.
21
CS511-L Dissolved Oxygen Probe
22
Appendix A. Dissolved Oxygen Tables
A-1
Appendix A. Dissolved Oxygen Tables
A-2
Appendix B. Sensorex’s Model DO6200/T
Prior to June 2008, Campbell Scientific’s CS511 was Sensorex’s model
DO6200/T (see FIGURE B-1) instead of Sensorex’s model DO6400/T.
Programming, wiring, and some specifications are the same for these two
sensors. However, they look different and use different accessories.
FIGURE B-1. Sensorex’s model DO6200/T
B.1 DO6200/T Specifications
Principle of Measurement:
Output Signal:
Accuracy:
Output Impedance:
Response Time:
Materials of Construction:
Probe body:
O-rings:
Membrane:
Membrane covered, galvanic oxygen probe
1.65 mV ± 0.45 mV per mg/l
Better than ± 2 % of reading ± 1 digit when
calibration temperature equals measuring
temperature ± 5°C
10 kΩ nominal
After equilibration, 2 min. for 90% of final
value
Delrin
Membrane O-ring = Buna N
Body Seal O-ring = Viton
0.05 mm Teflon
B-1
Appendix B. Sensorex’s Model DO6200/T
Dimensions and Weight:
Cable Length:
Cable Description:
Operating Conditions:
Temperature
Pressure:
Minimum Submersion Depth:
Minimum Water Flow:
Calibration:
Temperature Compensation:
Range of Dissolved Oxygen:
Electrode Materials:
Probe Electrolyte:
B.2 Accessories for DO6200/T
14054 Teflon Membrane for DO6200/T (Qty 5)
14053 Teflon Membrane for DO6200/T (Qty 25)
14056 Membrane Replacement Tool for DO6200/T
14055 DO Electrolyte for DO6200/T, 500 ml
8.9 cm (3.5 in) height, 5.6 cm (2.2 in)
diameter, 0.5 kg (1.1 lb)
3 m (10 ft)
5-wire, 22 AWG-shielded, PVC jacketed
0° to 50°C (32° to 122°F)
Maximum 10 atmospheres (147 psig)
60 mm (2.5 in)
5 cm/s (2 in/sec) across membrane
In air or in air saturated water
Automatic from 4° to 40°C (40° to 104°F)
0 to 20 mg/l, 0 to 200 % saturated
Ag cathode/Zn anode
NaCl
B-2
Appendix C. PT4-L Agitator
C.1 Description
The PT4 agitator is a reliable, robust agitator for use in conjunction with probes
subjected to bio-fouling in ponds and stagnant water conditions (flow <5 cm/s).
O
probes require a minimum water velocity across their membranes to function
2
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 C-1. Preventing Bio-fouling of a DO Sensor
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 on the design of the probe and type of
membrane used and water conditions. An ON-time of 0.25 s and OFF-time of 5 s
is suitable in most circumstances.
C-1
Appendix C. PT4-L Agitator
FIGURE C-2. DO sensor with PT4 Agitator
C.2 PT4-L Specifications
Diameter: 8.3 cm (3.25 in)
Length: 18.0 cm (7.125 in)
Weight: 0.6 kg (1.25 lb)
Cable length: 3 m (10 ft)
Power requirements: 10.5 to 18 Vdc at the agitator
Active current consumption: 1.1 A
Maximum ON time: 3 s
C.3 Agitator Control
Campbell Scientific ships the agitator with a repeat cycle timer. Using the
repeat-cycle timer requires no datalogger programming. However, some users
choose to use a solid-state relay and have the datalogger agitate the water on
the probe face either periodically throughout the day or just before
measurement. Agitating just before the measurement saves on power and
causes less wear and tear on the agitator and probe membrane.
C-2
Appendix C. PT4-L Agitator
The wiring for the agitator as controlled by this example program is as follows:
Datalogger
Ground/G
Port C 1
4 1
#7321 Relay
Crydom D1D07
3 2
FIGURE C-3. Agitator Wiring
The following instructions would trigger the agitator as discussed in the
agitator manual.
The CR800, CR850, CR1000, CR3000, and CR5000 use the Portset()
instruction as follows:
WHITE
BLUE
+ -
12 V Battery
Agitator
Portset (1,1)
Delay (1,500,msec)
Portset (1,0)
Portset (1,1)
Delay(500,msec)
Portset(1,0)
CR1000 Portset() Instruction Example
The CR200(X)-series use the Portset() instruction as follows:
CR200(X) Portset() Instruction Example
C-3
Appendix C. PT4-L Agitator
45: Do (P86)
1: 41 Set Port 1 High
46: Excitation with Delay (P22)
1: 1 Ex Channel
2: 20 Delay W/Ex (units = 0.01 sec)
3: 0 Delay After Ex (units = 0.01 sec)
4: 0 mV Excitation
47: Do (P86)
1: 51 Set Port 1 Low
48: End (P95)
The CR510, CR10X, and CR23X use instruction P86 and P22 as follows:
CR10X P86 and P22 Instructions Example
The above examples are not as power efficient as possible and would require
AC power to maintain a sufficient battery charge. If it is necessary to operate
an agitator without AC power available, write the program so that the agitator
is only operated for a short period of time just before the measurement is to be
taken.
C-4
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