Hach Polymetron 9523 Manuel D'utilisation Simplifié page 8

3.3.1 Principle of operation (pH calculation)
The 9523 analyzer adheres to the recommendations contained in the guidelines for feedwaters,
boiler water and steam quality for power and industrial plants.
The pH calculations can only be applied under the following strict chemical conditions:
• The sample must only contain an alkaline agent (ammonia, sodium hydroxide or ethanolamine)
• Any impurity is principally NaCl (sodium chloride)
• The concentration of impurity must be negligible in comparison to the alkaline agent
Section 4 Installation
Multiple hazards. Only qualified personnel must conduct the tasks described in this section of the
document.
4.1 Analyzer mounting
Attach the analyzer to a stable, vertical surface. Refer to the guidelines that follow and
Note: If an external controller is used, refer to the controller documentation for mounting instructions.
• Put the instrument in a location that has access for operation, service and calibration.
• Make sure that there is good view of the display and controls.
• Keep the instrument away from a heat source.
• Keep the instrument away from vibrations.
• Keep the sample tubing as short as possible to minimize the response time.
• Make sure that there is no air in the sample supply line.
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C A U T I O N
Figure 2.