Analytical Technology A15 Especificações descarregar pdf (Página 26)

ATI A15/76 Turbidity Monitor Part 6 – Operation

O&M Manual

Rev-H (8/11)

1. Refer to Figure 7 on page 11. The 3-way valve supplied with the flowcell provides a convenient port

for draining the flowcell and introducing a calibration standard into the flowcell. As part of the system,

a 60 cc syringe and 18” of silicon tubing is provided for use in feeding standard into the flowcell.

2. Prior to feeding standard, the flowcell must be drained. Turn the yellow valve handle so that the OFF

position is facing the sample inlet tube. This will stop sample flow and open the side port. Allow water

from the flowcell to drain out this port. Opening the flow control valve (white screw) on top of the

flowcell will allow sample to drain more quickly.

3. Remove the plunger from the syringe and set it aside. Connect the silicon tubing from the syringe to

the side port of the valve designated for calibration standard inlet. Use the syringe body like a funnel,

holding the bottom of the syringe silightly above the flowcell. Pour 40 NTU calibration solution (or 4

NTU if preferred) into the funnel until you have fed about 80-100 cc into the flowcell. Then close the

white flow control valve on top of the flowcell completely. This will lock calibration solution inside the

flowcell.

4. From display D2, press CAL once and then press ENTER. The display will indicate “SENS: XX.X%”,

with the XX.X indicating the relative sensitivity of the sensor.

5. Press CAL and the display will change to “CAL S: XX.X%”, and then press ENTER. The display will

now read “CAL S: XXX NTU”. Allow the standard to sit undisturbed while the monitor display comes

to a stable reading. Then use the UP or DOWN keys to adjust the display to the value of the

standard, either 4 or 40 NTU. Press ENTER and the UPDATE message will flash, indicating that the

calibration has been successful.

NOTE: The monitor calculates a new sensitivity % during the update. If the value you enter

results in a sensitivity value of less than 80% or more than 120%, an error message will

indicate this condition. Press ENTER and a NO UPDATE message will appear. This could

be due to a fouled sensor or a turbidity standard that has been contaminated.

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Analytical Technology A15 Especificações Página 26