Endress+Hauser Flowfit CYA27, Руководство по эксплуатации

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Operation Flowfit CYA27
30 Hauser
7.2 Sampling
Depending on the module selected, the assembly can be optionally fitted with a valve for
sampling. The sample, for example for a DPD test for sensor calibration, is taken as
follows:
1. Carefully open the sampling valve and rinse for a few seconds.
 Collect this quantity of liquid in a suitable vessel and discard.
2. Take a sample in a suitable vessel.
3. Close the sampling valve.
4. Check the flow setting/function of the assembly and readjust if necessary.
A0044137
Reduced flow may cause the sensor signals to fluctuate during sampling. This applies to
the membrane-covered disinfection sensors and may occur in the following cases:
• in the case of assemblies with low flow rates of 5 l/h (1.1 gal/h) and/or
• in the case of large sample volumes or long rinsing intervals.
Expected deviations in the sensor signal from membrane-covered disinfection sensors
during sampling (determined under laboratory conditions)
Flow variant Q Sample volume Sensor signal deviation
5 l/h (1.1 gal/h) 10 ml (0.34 fl oz) Approx. 3 %
50 ml (1.69 fl oz) Approx. 20 %
100 ml (3.38 fl oz) Approx. 30 %
30 l/h (6.6 gal/h) 10 ml (0.34 fl oz) None
50 ml (1.69 fl oz) None
100 ml (3.38 fl oz) Approx. 1 %
Fluctuating sensor signal during sampling
Depending on the integration of the sensor measured values in a higher-level control
system, the fluctuation of the sensor signal during sampling may have undesirable or
inadmissible consequences, such as alarm signals or incorrect control processes and
dosages.