Principles of Operation
Section 10
YSI, Incorporated
Model 85
26
Specific Conductance (25°C) = Conductivity
1 + TC * (T - 25)
As noted above, unless the solution being measured consists of pure KCl in water, this temperature
compensated value will be somewhat inaccurate, but the equation with a value of TC = 0.0191 will
provide a close approximation for solutions of many common salts such as NaCl and NH
4
Cl and for
seawater.
Salinity is determined automatically from the Model 85 conductivity readings according to
algorithms found in Standard Methods for the Examination of Water and Wastewater (ed. 1989).
The use of the Practical Salinity Scale 1978 results in values which are unitless, since the
measurements are carried out in reference to the conductivity of standard seawater at 15 C.
However, the unitless salinity values are very close to those determined by the previously-used
method where the mass of dissolved salts in a given mass of water (parts per thousand) was reported.
Hence, the designation "ppt" is reported by the instrument to provide a more conventional output.
For further information on conductivity and the above standard information, refer to the ASTM
document, Standard Methods of Test for Electrical Conductivity of Water and Industrial
Wastewater, ASTM Designation D1125-82, and OIML Recommendation Number 56. ASTM
symbols for conductivity, cell constant, and path length differ from those preferred in the general
literature and also from those used in this manual.
Содержание 85
Страница 2: ...YSI Model 85 Handheld Oxygen Conductivity Salinity mg L C and Temperature System Operations Manual ...
Страница 6: ...Introduction Section 1 YSI Incorporated Model 85 2 ...
Страница 10: ...Preparing the Meter Section 2 YSI Incorporated Model 85 6 ...
Страница 12: ...Preparing the Probe Section 3 YSI Incorporated Model 85 8 ...
Страница 14: ...Overview of Operation Section 4 YSI Incorporated Model 85 10 ...
Страница 18: ...Calibration Section 5 YSI Incorporated Model 85 14 ...
Страница 23: ...Making Measurements Section 7 YSI Incorporated Model 85 19 ...
Страница 24: ...Making Measurements Section 7 YSI Incorporated Model 85 20 ...
Страница 28: ...Maintenance Section 9 YSI Incorporated Model 85 24 ...
Страница 36: ...Discussion of Measurement Errors Section 11 YSI Incorporated Model 85 32 ...
Страница 43: ...Warranty and Repair Section 13 YSI Incorporated Model 85 39 ...
Страница 45: ...Accessories and Replacements Section 14 YSI Incorporated Model 85 41 ...
Страница 47: ...Specifications Appendix A YSI Incorporated Model 85 43 ...
Страница 53: ...Required Notice Appendix C YSI Incorporated Model 85 49 ...
Страница 55: ...Conversion Chart Appendix D YSI Incorporated Model 85 51 ...
Страница 59: ...Calibration Values Table Appendix F YSI Incorporated Model 85 55 ...
