YSI 900 Chlorine Colorimeter - Manual (Page 6)

6
Operation
Turn the unit on using the [ON/OFF] key.
The display shows the following:
Select the required test using the [MODE] key.
Scroll Memory (SM)
To avoid unnecessary scrolling for the required test method, the instrument memo-
rizes the last method used before being turned off. When the instrument is turned
on again, the scroll list comes up with the last used test method first.
The display shows the following:
Fill a clean vial with the water sample up to the 10 ml mark, screw the cap on and
place the vial in the sample chamber making sure that the marks are aligned.
Press the [ZERO/TEST] key.
The "Method" symbol flashes for approx. 8 seconds.
The display shows the following:
After zero calibration is completed, remove the vial from the sample chamber. The
characteristic coloration appears after the addition of the reagents.
Replace the cap on the vial and place in the sample chamber making sure that the
marks are aligned.
Press the [ZERO/TEST] key.
(For Countdown/reaction period see page 7)
The "Method" symbol flashes for approx. 3 seconds.
The result appears in the display.
The result is saved automatically.
repeating the test:
Press the [ZERO/TEST] key again.
repeating the zero:
Press the [ZERO/TEST] key for 2 seconds.
METHOD
METHOD
METHOD
RESULT
On
Off
Mode
Zero
Test
Zero
Test
Zero
Test
0.0.0
Zero
Test
METHOD
Functional Description