Xylem YSI ProDSS, User Manual

Page: 53 / 92

51
Calibration
ISE Calibration 3-Point
1. Perform the “Calibration setup (pH, ORP, ISE, conductivity, turbidity,
and total algae sensors)” on page 33 . Rinse the sensor 2-3 times
with a small amount of standard #1.
NOTE:
It is best to calibrate in order of increasing concentration
(e.g. if using 1 mg/L and 100 mg/L standards, calibrate with
1 mg/L first).
2. Push the Cal key, then select the applicable ISE sensor.
3. Carefully immerse the sensors into a solution of standard #1.
4. Allow the temperature of the standard to stabilize, then select
Calibration value . Enter the calibration value that corresponds to
standard #1.
5.
Observe the actual measurement readings for stability (white line
on graph shows no significant change for 40 seconds), then select
Accept Calibration
( Figure 59 ). “Ready for cal point 2” will be
displayed in the message area.
6. Select Finish Calibration to complete a 1-point calibration.
Otherwise, continue the calibration procedure to complete at least
a 2-point calibration.
NOTE: A 2-point calibration is extremely accurate and is the
preferred method.
7. Rinse the sensor 2-3 times with a small amount of standard #2.
Discard the standard after rinsing.
8. Carefully immerse the sensors into a fresh solution of standard #2.
9. Allow the temperature of the solution to stabilize then select
Calibration value . Enter the calibration value that corresponds to
standard #2.
10.
Observe the actual measurement readings for stability (white line
on graph shows no significant change for 40 seconds), then select
Accept Calibration
( Figure 59 ). “Ready for cal point 3” will be
displayed in the message area.
11. Select Finish Calibration to complete a 2-point calibration.
Otherwise, continue the calibration procedure to complete a
3-point calibration.
NOTE: To calibrate with a chilled third standard, see “Chilled third
calibration point” on page 52 .
12. Rinse the sensor 2-3 times with a small amount of standard #3.
Discard the standard after rinsing.
13. Carefully immerse the sensors into a fresh solution of standard #3.
14. Allow the temperature of the solution to stabilize then select
Calibration value . Enter the calibration value that corresponds to
standard #3.
15.
Observe the actual measurement readings for stability (white line
on graph shows no significant change for 40 seconds), then select
Accept Calibration
. “Calibration successful!” will be displayed in
the message area.
Figure 59 Calibrate ISE