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Some physical parameters in water are rapidly changing yet dynamically influenced by others like pH, temperature etc. Ammonia and Chlorine are examples.
The photometric method is a recognized standard (ISO 11732/ DIN 38408) and is widely used in industrial processes. It is identically same as laboratory method yet the operation is fully automatic. The measurement interval is approximately 4 minutes with periodic self cleaning and calibration (for ammonia). The sizes are compact, wall mounted possible and the operating cost is low.
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