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Rapidlab 1200 Operator’s Guide: System Overview and Intended Use
1-31
02087462 Rev. V
Using an established convention, the activity of ions that are measured by sensors
can be expressed in terms of concentration. This convention contains the
assumption that the normal ionic strength of blood plasma water is 160 mmol/kg.
3
Because ionic strength is the primary variable affecting the activity coefficient of
ionic species in solution, controlling the ionic strength of calibrating solutions to
160 mmol/kg sets the activity coefficients of ionic species in the calibrating
solutions equal to those of blood plasma water at sample ionic strengths close to
normal. Both calibrations and the expression of measured quantities may then be
made in units of concentration instead of activity.
4
Reference Sensor
The reference sensor for the 1200 systems works with certain measuring sensors
in the measurement module to create an electrochemical cell. The reference
sensor provides a fixed potential, which is independent of analyte activity. The
system compares the fixed potential of the reference sensor to the measured
potential from the following sensors:
Sensor
System
pH
1240, 1245, 1260, 1265
Na
+
1260, 1265
K
+
1260, 1265
Cl
-
1260, 1265
Ca
++
1260, 1265
Summary of Contents for Rapidlab 1200
Page 1: ...Rapidlab 1200 Systems Operator s Guide 02087462 Rev V 2010 01 ...
Page 6: ...iv Rapidlab 1200 Operator s Guide Using This Guide 02087462 Rev V ...
Page 88: ...1 68 Rapidlab 1200 Operator s Guide System Overview and Intended Use 02087462 Rev V ...
Page 126: ...2 38 Rapidlab 1200 Operator s Guide Operating the System 02087462 Rev V ...
Page 206: ...5 64 Rapidlab 1200 Operator s Guide Maintenance 02087462 Rev V ...
Page 290: ...6 84 Rapidlab 1200 Operator s Guide Troubleshooting 02087462 Rev V ...
Page 344: ...A 4 Rapidlab 1200 Operator s Guide Safety Instructions 02087462 Rev V ...
Page 354: ...B 10 Rapidlab 1200 Operator s Guide Service Ordering and Warranty 02087462 Rev V ...
Page 360: ...D 4 Rapidlab 1200 Operator s Guide Supplies 02087462 Rev V ...
Page 448: ...I 8 Rapidlab 1200 Operator s Guide Index 02087462 Rev V ...