Pyxis SP-395T TTA, Руководство по эксплуатации

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5. TTA Measurement
When powered on, the SP-395T will be in the measurement (read) mode (see figure 3). The displayed
value is the concentration of TTA.
Conversion to Alternate Species = To convert the reading value to Halogenated Azole (HRA), you may
multiply your TTA value reading by a factor of 0.75.
ie. 3.6ppm as TTA (SP-395T Reading) x 0.7 = 2.7ppm as Halogenated Azole
The water sample can be transferred to the measurement cell using a pipette or filled directly from a
faucet, sample bottle, or sample valve.
The light shield should be in the closed position in order to measure TTA.
Allow 5 seconds for the SP-395T to reach stable readings. For a sample containing 2 ppm TTA, the
measured TTA should be stabilized within the range of 1.9 to 2.1 ppm.
The SP-395T does not need to be turned off between measurements of two samples. Rinsing the
measurement cell several times is recommended.
5.1. High Color and Turbidity Warning & Background Fluorescence
The SP-395T has extra channels to measure sample turbidity and color. These measured parameters are
used in internal algorithms to automatically compensate sample color and turbidity interference from
your final TTA value. If sample turbidity and color values determined are too high, a warning will be
displayed. In such a case, the user should filter the sample for TTA measurement. Please note some
surface makeup waters can contain background fluorescence from organic contamination. In
applications like this it is important to pre-determine your background fluorescence and subtract that
value from your final reading. Measure the untreated surface makeup water and record the value.
Determine background for final reading adjustment.