Pyxis SP-380, Руководство пользователя

Страница: 9 / 27

6 Measurement
6.1 PTSA Measurement
When powered on, the SP-380 will default to the PTSA measurement mode. If the SP-380 is instead in
Fluorescein measurement mode, press
PTSA ( ) to switch to PTSA measurement mode. The water
sample can be transferred to the sample cell using a pipette or filled directly from a faucet, sample bottle,
or sample valve.
*
NOTE
*
Special care should be taken when pouring the sample into the cell to avoid air
bubble entrainment, which can interfere with reading accuracy.
Before beginning a measurement, use the sample water to rinse the sample cell at least three times. Allow
5–10 seconds for the SP-380 to stabilize. The values will be displayed in white with a blue background if
a stable value is reached (Figure 2). For a sample containing 100 ppb PTSA, the measured PTSA should be
stabilized within the range of 98–102 ppb.
*
NOTE
*
The time required to reach a stable reading may be slightly longer if the water
sample temperature is significantly different than the environmental temperature at which
the SP-380 had been equilibrated (stored).
6.1.1 High Color and Turbidity Warning
The SP-380 has extra channels to measure sample turbidity and color to automatically compensate sam-
ple color and turbidity interference. If sample turbidity and color values determined are too high, a PTSA
measurement warning will be displayed. In such a case, the user should filter the sample for PTSA mea-
surement.
SP-380 User Manual service@pyxis-lab.com | +1 (866) 203-8397 6