YSI 556 MPS - Manual (Page 54)

Section 6 Calibrate
YSI 556 MPS YSI Incorporated Page 48
NOTE: The sensor must be completely immersed. Using the
recommended volumes from Table 6.1 Calibration Volumes,
should ensure that the sensor is covered.
9. Screw the transport/calibration cup on the threaded end of the
probe module and securely tighten
NOTE: Do not over tighten as this could cause damage to the
threaded portions.
10. Use the keypad to enter the calibration value of the buffer you
are using at the current temperature.
NOTE: pH vs. temperature values are printed on the labels of
all YSI pH buffers.
11. Press Enter. The pH calibration screen is displayed.
Figure 6.14 pH Calibration Screen
12. Allow at least one minute for temperature equilibration before
proceeding. The current values of all enabled sensors will
appear on the screen and will change with time as they
stabilize.
13. Observe the reading under pH, when the reading shows no
significant change for approximately 30 seconds, press Enter.