Xylem YSI ProDSS, Руководство пользователя

Страница: 42 / 92

40
Calibration
pH Calibration 2- or 3-Point
NOTE: If performing a 2- or 3-point calibration, one point should
be in buffer 7; however, the calibration points can be in any
order.
1. Perform steps 1-7 of the pH calibration 1-point procedure ( “pH
calibration 1-point” on page 39 ).
2. Rinse the sensor 2-3 times with a small amount of pH 4 or pH 10
buffer solution.
3. Rinse, then fill the calibration cup to the appropriate level with
the buffer solution that is the same value (pH 4 or pH 10) used to
rinse the sensor.
4.
Carefully immerse the sensors into the solution.
5. Allow at least one minute for temperature stabilization. The
Calibration value will automatically be adjusted based on the
selected buffer set and temperature. Alternatively, the Calibration
value can be manually entered.
6. Observe the actual measurement readings for stability (white line
on graph shows no significant change for 40 seconds), then select
Accept Calibration ( Figure 52 ). “Ready for cal point 3” will be
displayed in the message area.
7. After calibrating to the second point, select Finish Calibration
for a 2-point calibration or continue with an additional buffer to
complete a 3-point calibration. The procedure will automatically
finish after calibrating using a third buffer.
ORP Calibration
1. Obtain/prepare a standard with a known oxidation reduction
potential (ORP) value.
NOTE: YSI recommends Zobell solution.
2. Perform the “Calibration setup (pH, ORP, ISE, conductivity, turbidity,
and total algae sensors)” on page 33 .
3. Fill the calibration cup to the appropriate level with standard
solution.
4. Carefully immerse the sensors into the solution.
5. Push the Cal key, then select pH/ORP , then ORP .
6.
Allow the temperature of the standard to stabilize. If using YSI
Zobell solution, the
Calibration value
will automatically be
adjusted based on the temperature. Alternatively, the Calibration
value can be manually entered.
7. Observe the actual measurement readings for stability (white line
on graph shows no significant change for 40 seconds), then select
Accept Calibration ( Figure 53 ). “Calibration successful!” will be
displayed in the message area.
Figure 52 Calibrate pH 2- or 3-point
Figure 53 Calibrate ORP