7.5
pH Calibration
The SP-710 is designed to provide a flexible calibration procedure. The user can start with the one-point
pH7 calibration and progressively add a two- and three-point calibration with the pH4 and pH10 buffers.
This allows the user to choose a procedure based on the need of measurement accuracy and the target pH
range. Follow the steps below to conduct either a one-point, two-point, or three-point pH calibration:
1. Power on the SP-710 by pressing
.
2. Rotate the pH/ORP cell seal to touch the front face of the module as seen in Figure 5. This is to power
on the module. The indicator light of the module will be green and flashing when powered on. After
the module is turned on, the seal can be positioned anywhere desired.
*
NOTE
*
If the module battery capacity is low, the indicator light will flash red .
3. Press
Calib
(
) as needed to highlight
pH
in the selection menu.
4. Press
to launch the
pH CALIBRATION
screen.
5. The main module of the SP-710 will automatically connect after the pH/ORP module has been pow-
ered up.
7.5.1
One-Point Calibration
6. Rinse the pH/ORP sample cell three times with the pH7 buffer. Fill the sample cell with the pH7 buffer.
7. Allow 5–10 seconds for the pH measurement to stabilize and the padlock (
) to appear.
8. Press
pH7
(
or
) to start a one-point calibration.
9. If the calibration succeeds, a checkmark (
) and a ”pH7 Calibration success!” message will appear
(Figure 44). Otherwise, a warning message is displayed.
10. After a successful one-point calibration, choose one of two options:
(a) Press
Next
(
or
) to proceed to a two- or three-point calibration,
or
(b) Press
Exit
(
) to end the calibration process at a one-point calibration.
7.5.2
Two-Point Calibration
11. Choose either the pH4 or pH10 buffer for a two-point calibration.
12. Rinse the pH/ORP sample cell three times with the chosen buffer. Fill the sample cell with the chosen
buffer.
13. Allow 5–10 seconds for the pH measurement to stabilize and the padlock (
) to appear.
14. Press
Calib
(
or
) to start a two-point calibration.
15. If the calibration succeeds, a checkmark (
) and a ”pH4 Calibration success!” or a ”pH10 Calibration
success!” message will appear (Figure 45). Otherwise, a warning message is displayed.
16. After a successful two-point calibration, choose one of two options:
(a) Press
Next
(
or
) to proceed to a three-point calibration,
or
(b) Press
Exit
(
) to end the calibration process at a two-point calibration.
SP-710 User Manual
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