INSTRUCTION MANUAL CS526 ISFET pH Probe Revision: 4/15 C o p y r i g h t © 2 0 0 9 - 2 0 1 5 C a m p b e l l S c i e n t i f i c , I n c .
Limited Warranty The CS526 ISFET pH Probe is warranted for six (6) months subject to this limited warranty: “Products manufactured by CSI are warranted by CSI to be free from defects in materials and workmanship under normal use and service for twelve months from the date of shipment unless otherwise specified in the corresponding product manual. (Product manuals are available for review online at www.campbellsci.com.
Assistance 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) 227-9000.
Precautions DANGER — MANY HAZARDS ARE ASSOCIATED WITH INSTALLING, USING, MAINTAINING, AND WORKING ON OR AROUND TRIPODS, TOWERS, AND ANY ATTACHMENTS TO TRIPODS AND TOWERS SUCH AS SENSORS, CROSSARMS, ENCLOSURES, ANTENNAS, ETC. FAILURE TO PROPERLY AND COMPLETELY ASSEMBLE, INSTALL, OPERATE, USE, AND MAINTAIN TRIPODS, TOWERS, AND ATTACHMENTS, AND FAILURE TO HEED WARNINGS, INCREASES THE RISK OF DEATH, ACCIDENT, SERIOUS INJURY, PROPERTY DAMAGE, AND PRODUCT FAILURE.
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 ............................................... 1 3. Initial Inspection ......................................................... 2 4. Quickstart .................................................................... 2 4.1 4.
Table of Contents A.1 Importing Short Cut Code into a Program Editor............................ A-1 B. Example Program.................................................... B-1 C. Calibration ............................................................... C-1 C.1 Example Calibration Program ......................................................... C-2 9-1. Tip of the CS526 probe ..................................................................... 11 7-1. 7-2. 7-3. 7-4. Wiring ........................
CS526 ISFET pH Probe 1. Introduction The CS526 ISFET pH Probe measures pH from 1 to 14 in aqueous or semisolid solutions. It outputs TTL serial data that is read by compatible dataloggers (see Section 6, Specifications (p. 5)). Before using the CS526, please study • • • Section 2, Cautionary Statements (p. 1) Section 3, Initial Inspection (p. 2) Section 4, Quickstart (p. 2) More detailed instructions for operation, troubleshooting, and maintenance are available in the remaining sections. 2.
CS526 ISFET pH Probe 3. Initial Inspection Upon receipt of the CS526, inspect the packaging and contents for damage. File damage claims with the shipping company. 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 correct product and cable length are received. 4. Quickstart For complete installation, programming, and calibration information, see Sections 7.1 Wiring (p. 6), through 7.
CS526 ISFET pH Probe 3. When Short Cut opens, select New Program. 4. Select Datalogger Model and Scan Interval (default of 5 seconds is OK for most applications). Click Next.
CS526 ISFET pH Probe 5. Under the Available Sensors and Devices list, select the Sensors | Water | Quality folder. Select CS526 ISFET pH Probe. Click selection to the Selected device window. 4 to move the 6. After selecting the sensor, click at the left of the screen on Wiring Diagram to see how the sensor is to be wired to the datalogger. The wiring diagram can be printed out now or after more sensors are added. 7.
CS526 ISFET pH Probe 5. 8. If LoggerNet, PC400, or PC200W is running on your PC, and the PC to datalogger connection is active, you can click Finish in Short Cut and you will be prompted to send the program just created to the datalogger. 9. If the sensor is connected to the datalogger, as shown in the wiring diagram in step 6, check the output of the sensor in the datalogger support software data display to make sure it is making reasonable measurements.
CS526 ISFET pH Probe Operating Temperature: Water Pressure: 10 to 40 °C 0 to 700 kPa (0 to 101.5 psi) Power Requirement Source: Load: 5 Vdc 15 mA maximum Output: TTL logic, 2400 bps 8 data bits, no parity, 1 stop bit Maximum Cable Length: 100 m (328 ft) Cable Type: Three-twisted pair, 24-AWG cable with Santoprene jacket Sensor Material: PEEK Weight w/10-ft cable: 318 g (11.2 oz) Dimensions Length: Diameter: 102 mm (4 in) 16 mm (0.63 in) Certifications: 7.
CS526 ISFET pH Probe CAUTION 7.2 This probe must be connected to the datalogger’s 5 V terminal (not 12 V). Connecting to a higher voltage will damage the probe beyond repair. Datalogger Programming 7.2.1 Get Data Command The datalogger needs to send a “get data” serial command to the CS526 to get the pH data. This command is sent to the CS526 via the SerialOut() CRBasic instruction (see Section 7.2.3.2, SerialOut() Instruction (p. 8)). TABLE 7-2 shows the “get data” command and its response. TABLE 7-2.
CS526 ISFET pH Probe NOTE Probe output is “Counts”. A corrected multiplier and offset are required to provide an output in pH units (see Appendix C, Calibration (p. C-1)). 7.2.3 Instruction Descriptions 7.2.3.1 SerialOpen() Instruction The SerialOpen() instruction has the following syntax: SerialOpen(ComPort,BaudRate,Format,TXDelay,BufferSize) ComPort—the datalogger COM port in which the probe is connected.
CS526 ISFET pH Probe 7.2.3.4 SplitStr() Instruction The SplitStr() instruction has the following syntax: SplitStr(SplitResult,SearchString,FilterString,NumSplit,SplitOption) SplitResult—an array in which the split string will be stored. SearchString—the string on which this instruction will operate. This will be the variable entered for the Dest parameter for the SerialIn() instruction (see above). FilterString—enter “String” (this value will be ignored because of the SplitOption that will be used).
CS526 ISFET pH Probe Problem: Output signal is at its maximum value. Possible reasons: o Probe is not in fluid. o Chip is polluted. o Diaphragm is polluted. o Chip is scratched. Suggestions: o Put probe in fluid. o Clean probe (Section 9.1, Cleaning (p. 10)). o Probe cannot be fixed if chip is scratched. Problem: Probe response is very slow. Possible reason: o Diaphragm is chipped or polluted. Suggestion: o Clean probe (Section 9.1, Cleaning (p. 10)). Problem: Probe signal is drifting.
CS526 ISFET pH Probe Clean the probe if any of the following occur: • • • • • • Low slope Drift Instability of the reading Slow calibration Probe will not calibrate pH value doesn’t change as expected when changing samples Additionally, when sampling colored liquids, the probe should be cleaned when the reference diaphragm is no longer white. 9.1.2 Cleaning Procedure Read Section 9.1.2.1, Cleaning Tips (p. 12), before following this procedure. CAUTION 1.
CS526 ISFET pH Probe 9.1.2.1 Cleaning Tips • To avoid scratches on the sensor surface, rinse the probe thoroughly using water before cleaning the probe with the soft brush supplied with the meter and tap water with a mild detergent added. Most scratches on the sensor are caused when there are hard particles in the sample and the sample is rubbed into the sensor when cleaning with the toothbrush.
Appendix A. Importing Short Cut Code This tutorial shows: • • How to import a Short Cut program into a program editor for additional refinement How to import a wiring diagram from Short Cut into the comments of a custom program A.1 Importing Short Cut Code into a Program Editor Short Cut creates files that can be imported into CRBasic Editor program editor. These files normally reside in the C:\campbellsci\SCWin folder and have the following extensions: • • • • .
Appendix A.
Appendix B. Example Program The following is a CR1000 program that measures the CS526. This program assumes the CS526 is connected to COM1 (C1 / TX and C2 / RX) on the CR1000.
Appendix B.
Appendix C. Calibration This calibration process uses 7-pH and 4-pH buffer solutions. NOTE Protect the sensing chip from UV radiation during calibration. If calibrating in sun or fluorescent light, shield the sensing chip from UV radiation by using dark containers for the buffer solutions. Load the example CRBasic program into the datalogger (Appendix C.1, Example Calibration Program (p. C-2)). Wire the CS526 to the datalogger according to the following diagram.
Appendix C. Calibration C.1 Example Calibration Program Following is a simple example program to facilitate the two-point calibration. Although this is a CR1000 program, the other dataloggers are programmed similarly.
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