YSI 556 MPS - Manual (Page 44)

Section 6 Calibrate
YSI 556 MPS YSI Incorporated Page 38
WARNING: Calibration reagents may be hazardous to your
health. See Appendix D Health and Safety for more
information.
NOTE: For maximum accuracy, the conductivity standard
you choose should be within the same conductivity range as
the samples you are preparing to measure. However, we do
not recommend using standards less than 1 mS/cm. For
example:
9 For fresh water use a 1 mS/cm conductivity standard.
9 For brackish water use a 10 mS/cm conductivity standard.
9 For seawater use a 50 mS/cm conductivity standard.
NOTE: Before proceeding, ensure that the sensor is as dry as
possible. Ideally, rinse the conductivity sensor with a small
amount of standard that can be discarded. Be certain that you
avoid cross-contamination of solutions. Make certain that
there are no salt deposits around the oxygen and pH/ORP
sensors, particularly if you are employing standards of low
conductivity.
7. Carefully immerse the sensor end of the probe module into
the solution.
8. Gently rotate and/or move the probe module up and down to
remove any bubbles from the conductivity cell.
NOTE: The sensor must be completely immersed past its vent
hole. Using the recommended volumes from Table 6.1
Calibration Volumes, should ensure that the vent hole 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.