Hach-Lange 9187 sc - Manual (Page 8)

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General Information
2.2 General Sensor Information
The system consists of a controller with an integrated display, and a sensor ( Figure 2 ).
The choice can be made to use this instrument with the specifications and processes of
the 9184sc, 9185sc, or 9187sc sensor. This is determined by selecting the parameter
during the initial sensor setup and the type of sensor being used. See
4.3 Sensor Setup
on page 19 .
2.3 Theory of Operation
Refer to the following Appendices.
• Appendix A 9184sc Theory of Operation on page 37
• Appendix B 9185sc Theory of Operation on page 39
• Appendix C 9187sc Theory of Operation on page 41
Figure 1 Sensor Cell Operation*
1. Membrane 7. Electrolyte
2. Membrane Holder 8. Probe Body
3. Anode 9. Cathode
4. Electrolyte Filling Plug 1
1 A small hole exists in the plug to allow the instrument to maintain a consistent pressure regardless of changes in atmospheric
pressure.
10. Membrane/Interface Sample
5. Electrolyte Filling Hole 11. Sample
6. Assembled Electrode
*See Replacement Parts and Accessories on page 31 .