Hach PAT700 DS, Basic User Manual

Page: 19 / 192

Figure 9 Calibration resistor
1 Calibration resistor (optional)
Do a system suitability test
A system suitability test examines analyzer measurements according to the guidelines established in
USP Method <643> using 500 ppb sucrose and 500 ppb 1,4-benzoquinone standards.
1. Make sure that the system suitability test standards are at room temperature.
2. Push << to show the sliding menu.
3. Push BOTTLE MODE , then RUN STANDARDS .
4. Push SYSTEM SUITABILITY .
5. Install the standards in the order shown on the screen.
Note: If the bottle bay door closes too soon, push UNLOCK to open the door.
6. Close the bottle bay door, then push the forward icon.
If bottles have been properly loaded and the RFID tags can be read, the review test setup dialog
box shows. If not, enter the bottle information as prompted.
7. Push START .
Three samples are drawn from each bottle. After all the repetitions are complete, the analyzer
repeats the process for the rest of the bottles.
Once all the bottles have been analyzed, the analyzer compares the average reading of the
sucrose standard to the average reading of the 1,4 benzoquinone. If the two values are within
±15% of each other, the test passes. The analyzer then shows the test summary dialog box. The
formulas that follow are used to calculate the response efficiency.
r
e
= 100 × (SR ÷ LR)
Where:
SR = suitability response of the analyzer defined as (r
ss
– r
w
)
LR = limit response of the analyzer defined as (r
s
– r
w
).
r
e
= response efficiency of the PAT700
r
w
= average TOC response for the blank
r
s
= average TOC response for the sucrose standard
English 19