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Campbell 247 Instruction Manual

Conductivity and temperature probes
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247 Conductivity and
Temperature Probes
Revision: 3/96
C o p y r i g h t
( c )
1 9 9 4 - 1 9 9 6
C a m p b e l l
S c i e n t i f i c ,
I n c .

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  • Page 1 247 Conductivity and Temperature Probes Revision: 3/96 C o p y r i g h t ( c ) 1 9 9 4 - 1 9 9 6 C a m p b e l l S c i e n t i f i c ,...
  • Page 2 Warranty and Assistance The 247-L CONDUCTIVITY & TEMPERATURE 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...

  • Page 3: Table Of Contents

    247 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 Temperature Sensor ..................1 2. Specifications .............1 2.1 Probe......................1...
  • Page 4 10. Instruction 11 Details..........9 11. Electrically Noisy Environments......10 12. Long Lead Lengths Temperature......10...

  • Page 5: Overview

    1. OVERVIEW the center electrode with positive and negative 247 Probes (247-L and 247W-L) are designed for voltage. The two outer electrodes return the measuring the electrical conductivity, dissolved signal to the datalogger.

  • Page 6: Ec Sensor

    Temp. Range of Use: Above freezing to 50°C. temperature or measurement errors will result. EC Range: Approx. 0.005 to 7.5 mS cm To make previous versions of the 247 (those Accuracy: in KCl and Na , NaHCO , and without an orange lead) compatible with the NaCl standards at 25°C:...

  • Page 7: Measurement Programming

    247 CONDUCTIVITY AND TEMPERATURE PROBES FIGURE 4-1. 247 Wiring Diagram AC Half Bridge 5.2 MEASUREMENT PROGRAMMING. EC Results from Instructions 5 or 6 (chosen 2500 mV fast Range automatically as part of the autoranging feature (Use 5000 mV fast for 21X)

  • Page 8: Correction Of Ionization Errors In Ec Measurement

    247 CONDUCTIVITY AND TEMPERATURE PROBES Full Bridge NOTE: The cell constant (K ) is printed on the label of each sensor. It is entered in place of 250 mV fast Range nnn in this segment. (Use 500 mV fast for 21X)

  • Page 9: Correction Of Temperature Errors

    102). X Loc Ct 6.3 FACTORY CALIBRATION Z Loc [:100*Ct ] The 247 is shipped with a cell constant Z=X*F calibrated in a 0.01 molal KCl solution at 25.0°C X Loc A ±0.05°C. The solution has a EC of 1.408 mS Enter TC (%°C...

  • Page 10: Field Calibration

    Corrosion and abrasion, however, have the Loc [Rp ] potential of causing significant errors. -.005 Loc [:Rp A field calibration of the 247 cell constant can be accomplished as follows: Z=X+Y X Loc Rs 1. Make a 0.01 molal KCL solution by Y Loc Rp dissolving 0.7456 g of reagent grade KCl in...

  • Page 11: Maintenance

    After Correction: Routine maintenance includes thoroughly < 2.0%, 0.45 to 7.0 mS cm cleaning the orifice of the 247 probe with the < 8.0%, 0.005 to 0.45 mS cm black nylon brush provided and a little soapy Correction of Ionization Errors. Figures 8.1-1 and water.

  • Page 12: Temperature Measurement Error

    247 CONDUCTIVITY AND TEMPERATURE PROBES 8.2 TEMPERATURE MEASUREMENT ERROR TABLE 8.2-1. Thermistor Interchangeability Specification The overall probe accuracy is a combination of the Temperature thermistor's interchangeability specification, the Temperature (°C) Tolerance (±°C) precision of the bridge resistors, and the polynomial error.

  • Page 13: Deriving A Temperature Compensation Coeffecient

    9. DERIVING A TEMPERATURE at several temperatures are shown in Table 10-1. COMPENSATION COEFFICIENT 1. Place the 247 in a sample of the solution to TABLE 10-1. Temperature , Resistance, and be measured. Bring the sample and the Datalogger Output probe to 25°C.
  • Page 14 ENVIRONMENTS TEMPERATURE AC power lines can be the source of electrical If the 247-L/247W-L has lead lengths of more noise. If the datalogger is in an electronically than 300 feet, use the DC Half Bridge noisy environment, the 107/107B temperature...
  • Page 15 247 CONDUCTIVITY AND TEMPERATURE PROBES 13. 247 SCHEMATIC FIGURE 11-1. 247 Conductivity and Temperature Circuit Diagram...
  • Page 16 247 CONDUCTIVITY AND TEMPERATURE PROBES This is a blank page.
  • Page 17 This is a blank page.
  • Page 18 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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247-l247w-l

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