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Summary of Contents for Campbell CS547
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Page 1: A547 Interface
CS547 Conductivity and Temperature Probe and A547 Interface Revision: 9/00 C o p y r i g h t ( c ) 1 9 9 4 - 2 0 0 0 C a m p b e l l S c i e n t i f i c ,... - Page 2 Warranty and Assistance The CS547 CONDUCTIVITY AND TEMPERATURE PROBE AND A547 INTERFACE are 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.
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Page 3: Table Of Contents
CS547 Probe and A547 Interface 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. Overview..............1 1.1 EC Sensor ....................1 1.2 A547 Interface ..................1 2. - Page 4 CS547 Probe and A547 Interface Table of Contents 9. Deriving a Temperature Compensation Coefficient ..............15 10. Instruction 11 Details..........15 11. Electrically Noisy Environments......16 12. Long Lead Lengths Temperature......17 13. CS547 Schematic ............18...
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Page 5: Overview
CS547 Conductivity and Temperature Probe and A547 Interface 1. Overview The CS547 conductivity and temperature probe, and A547 interface are designed for measuring the electrical conductivity, dissolved solids, and temperature of fresh water with Campbell Scientific dataloggers. They require the use of AC excitation, so they can be used with the CR10(X), 21X, and CR7 dataloggers but not with the BDR301 or BDR320. -
Page 6: Specifications
, U t a T E R F A C IN U A547 FIGURE 1-1. A547 Interface and CS547 Conductivity and Temperature Probe 2. Specifications 2.1 CS547 Probe The probe housing is stainless steel Construction Size Probe Length: 3.7 inches (94 mm) Diameter: 0.95 inches (24.13 mm) -
Page 7: Temperature Sensor
CS547 Conductivity and Temperature Probe and A547 Interface 2.3 Temperature Sensor Betatherm 100K6A1. Thermistor Range 0°C to 50°C. Accuracy Error ±0.4°C (See Section 8.2). 3. Installation CAUTION Rapid heating and cooling of the probe, such as leaving it in the sun and then submersing it in a cold stream, may cause irreparable damage. -
Page 8: Programming
FIGURE 4-1. CS547 Wiring Diagram for Example Below 5. Programming 5.1 Programming Overview Typical datalogger programs to measure the CS547 consist of four parts: Measurement of EC and temperature Correction of ionization errors in EC measurements Correction of temperature errors in EC measurements... - Page 9 CS547 Conductivity and Temperature Probe and A547 Interface *Table 1 Program 01: 5 Execution Interval (seconds) ;Make a preliminary measurement of resistance for autoranging. 1: Full Bridge (P6) 1: 1 Reps ±2500 mV Fast Range 2: 15 3: 1 DIFF Channel...
- Page 10 CS547 Conductivity and Temperature Probe and A547 Interface 9: Full Bridge (P6) 1: 1 Reps ±2500 mV Fast Range 2: 15 3: 1 DIFF Channel 4: 1 Excite all reps w/Exchan 1 5: 2500 mV Excitation 6: 1 Loc [ Rs 7: -.001...
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Page 11: Correction Of Ionization Errors In Ec Measurement
5.3 Correction of Ionization Errors in EC Measurement Ionization caused by the excitation of the EC sensor can cause large errors. Campbell Scientific has developed a linear correction for conductivity between 0.005 and 0.44 mS cm , and a quadratic correction for conductivity between 0.44 and 7.0 mS cm... -
Page 12: Correction Of Temperature Errors
CS547 Conductivity and Temperature Probe and A547 Interface The following program segment automatically chooses which correction to apply to the measurement. ;The following program set corrects for errors of ionization in the EC ;measurement. 25: IF (X<=>F) (P89) 1: 3... -
Page 13: Output Processing
CS547 Conductivity and Temperature Probe and A547 Interface ;This next program set will correct errors in the EC measurement resulting ;from temperature differences. 31: Z=X+F (P34) 1: 4 X Loc [ Temp_degC ] 2: -25 3: 6 Z Loc [ A... -
Page 14: Calibration
(USGS Water-Supply Paper 1473, p. 102). 6.3 Factory Calibration The CS547 is shipped with a cell constant calibrated in a 0.01 molal KCl solution at 25.0°C ±0.05°C. The solution has a EC of 1.408 mS cm 6.4 Field Calibration The cell constant is a dimensional number expressed in units of cm . - Page 15 CS547 Conductivity and Temperature Probe and A547 Interface Connect the CS547 and A547 or probe and interface to the datalogger using the wiring described in Section 4. Enter the following program into the datalogger. The calibration solution temperature must be between 1°C and 35°C; the polynomial in step 11 (P58) corrects for temperature errors within this range.
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Page 16: Maintenance
X Loc Act'l Con Y Loc Rs Z Loc [Kc (cm-1)] 7. Maintenance Routine maintenance includes thoroughly cleaning the orifice of the CS547 probe with the black nylon brush provided and a little soapy water. Rinse thoroughly. 8. Analysis of Errors 8.1 EC Measurement Error... - Page 17 CS547 Conductivity and Temperature Probe and A547 Interface Correction of Ionization Errors: Figures 8.1-1 and 8.1-2 show the amount of correction applied by the example program to compensate for ionization effects on the measurements. Also shown is an ideal correction. Factors were derived by measuring the standard solutions described in Section 2.2 with values of 0.0234,...
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Page 18: Temperature Measurement Error
CS547 Conductivity and Temperature Probe and A547 Interface 8.2 Temperature Measurement Error The overall probe accuracy is a combination of the thermistor's interchangeability specification, the precision of the bridge resistors, and the polynomial error. In a "worst case" all errors add to an accuracy of ±0.4°C over the range of -24° to 48°C and ±0.9°C over the range of -38°C to 53°C. -
Page 19: Deriving A Temperature Compensation Coefficient
CS547 Conductivity and Temperature Probe and A547 Interface 9. Deriving a Temperature Compensation Coefficient Place the CS547 in a sample of the solution to be measured. Bring the sample and the probe to 25°C. Enter the example program from Section 5.2 in the datalogger and record at 25°C from Location 3. -
Page 20: Electrically Noisy Environments
CS547 Conductivity and Temperature Probe and A547 Interface TABLE 10-1. Temperature , Resistance, and Datalogger Output 0.00 351017 -0.06 2.00 315288 1.96 4.00 283558 3.99 6.00 255337 6.02 8.00 230210 8.04 10.00 207807 10.06 12.00 187803 12.07 14.00 169924 14.06 16.00... -
Page 21: Long Lead Lengths Temperature
** On the 21X and CR7 use the 15 mV input range and 4000 mV excitation. 12. Long Lead Lengths Temperature If the CS547 has lead lengths of more than 300 feet, use the DC Half Bridge instruction (Instruction 4) with a 2 millisecond delay to measure temperature. -
Page 22: Cs547 Schematic
CS547 Conductivity and Temperature Probe and A547 Interface 02: Polynomial (P55) X Loc Temp_C F(X) Loc [:Temp_C ] -53.46 90.807 -83.257 52.283 -16.723 2.211 Proper entries will vary with program and datalogger channel and input location assignments. ** On the 21X and CR7 use the 15 mV input range and 4000 mV excitation. - Page 23 CS547 Conductivity and Temperature Probe and A547 Interface Datalogger Sensor Connections Connections EX TEMP EX COND EX COND 220µFD 220µFD HI COND COND 220µFD 220µFD LO COND SE TEMP TEMP EX TEMP SHIELD SHIELD FIGURE 13-2. A547 Interface Circuit Diagram...
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- Page 26 Campbell Scientific Companies Campbell Scientific, Inc. (CSI) 815 West 1800 North Logan, Utah 84321 UNITED STATES www.campbellsci.com info@campbellsci.com Campbell Scientific Africa Pty. Ltd. (CSAf) PO Box 2450 Somerset West 7129 SOUTH AFRICA www.csafrica.co.za sales@csafrica.co.za Campbell Scientific Australia Pty. Ltd. (CSA)
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