Hach MP-4 User Manual page 4

Table of contents
4.1 Calibration intervals ...................................................................................31
4.2 Calibration limits ........................................................................................31
4.3 Calibration records ....................................................................................31
4.4 Calibrate the meter ....................................................................................31
4.5 Exit calibration mode .................................................................................32
4.6 Calibrate conductivity, mineral/salt or TDS ................................................32
4.7 Calibrate resistivity ....................................................................................33
4.8 Reset factory calibration-conductivity, mineral/salt or TDS .....................33
4.9 pH calibration .............................................................................................33
4.10 Set multiple point pH calibrations ............................................................34
4.11 ORP calibration .......................................................................................35
4.12 Temperature calibration ...........................................................................35
Section 5 Maintenance
5.1 Temperature extremes ..............................................................................37
5.2 Battery replacement ..................................................................................37
5.2.1 Maintain the conductivity cup ..........................................................38
5.2.2 Maintain the pH/ORP sensor cup ....................................................38
5.3 pH/ORP sensor replacement .....................................................................38
5.4 Clean the sensors ......................................................................................38
5.4.1 Clean the conductivity/resistivity/TDS sensor .................................38
5.4.2 Clean the pH/ORP sensor ...............................................................39
Section 6 Troubleshooting
Section 7 Contact Information
Section 8 Replacement parts and accessories
8.1 Replacement parts ....................................................................................45
8.2 Accessories ...............................................................................................45
8.3 Consumables .............................................................................................45
8.4 Recommended cleaning consumables ......................................................46
Section 9 Limited Warranty
Appendix A Temperature compensation
A.1 Compensation to 25 ºC .............................................................................49
A.2 Changes in temperature compensation ....................................................49
A.3 Graph of comparative error .......................................................................50
A.4 Other solutions ..........................................................................................50
Appendix B Conductivity conversion
B.1 How conductivity conversion works ..........................................................51
B.2 Solution characteristics .............................................................................51
Appendix C Temperature compensation and TDS derivation
C.1 Conductivity characteristics ......................................................................53
C.2 Temperature compensation of unknown solutions ...................................53
C.2.1 Find temperature compensation by calculation ..............................53
C.2.2 Find temperature compensation by adjustment ..............................53
C.3 TDS ratio of unknown solutions ................................................................54
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