Yokogawa PH72 Personal pH/ORP Meter - Manual (Page 5)

IM 12B03D02-01E 4
Contents
CONTENTS
Preface ...................................................................................................................... 1-1
1. Outline ................................................................................................................. 1-1
1.1 Features ......................................................................................................................... 1-1
1.2 Specifications ................................................................................................................. 1-2
1.3 When You Receive the PH72 Meter Package .............................................................. 1-3
1.4 PH72 Meter Kit .............................................................................................................. 1-4
1.5 PH72 Meter — Part Names and Functions .................................................................. 1-5
1.6 Sensors — Types, Part Names and Functions ............................................................. 1-6
1.7 Options (Available Separately) ...................................................................................... 1-8
1.8 Spare Parts .................................................................................................................... 1-9
2. Preparation .......................................................................................................... 2-1
2.1 Installing the Batteries ................................................................................................... 2-1
2.2 Connecting the Sensor Cable ....................................................................................... 2-2
2.3 Setting the Date and Time ............................................................................................ 2-3
2.4 Selecting pH or ORP Measurement .............................................................................. 2-4
2.5 Wetting Cap ................................................................................................................... 2-4
2.6 Manual Temperature Setting ......................................................................................... 2-5
2.7 pH Calibration ................................................................................................................ 2-5
3. Measurement ...................................................................................................... 3-1
3.1 Precautions .................................................................................................................... 3-1
3.2 Measurement Procedures ............................................................................................. 3-2
3.3 Measurement Display Panel .......................................................................................... 3-3
3.4 Saving a Measured Value ............................................................................................. 3-3
4. Calibration ........................................................................................................... 4-1
4.1 Automatic Calibration ..................................................................................................... 4-3
4.2 Manual Calibration ......................................................................................................... 4-6
5. Keypad and Display Functions ......................................................................... 5-1
5.1 Keypad Functions .......................................................................................................... 5-2
5.2 Display Items ................................................................................................................. 5-4
5.3 Function Mode ............................................................................................................... 5-5
6. Maintenance ........................................................................................................ 6-1
6.1 For Optimum Meter Performance .................................................................................. 6-1
6.2 pH Electrode Cleaning ................................................................................................... 6-2
6.3 Sensor Replacement ..................................................................................................... 6-3
6.4 Rehydrating the Glass Electrode ................................................................................... 6-3
6.5 Replenishing the Electrode with Filling Solution (KCl solution) .................................... 6-4
6.6 Cleaning and Drying Connectors .................................................................................. 6-5
6.7 Storage and O-ring/Gasket Replacement ..................................................................... 6-6
7. Troubleshooting ................................................................................................. 7-1
7.1 Causes of Abnormal Readings and Errors ................................................................... 7-1
7.2 Error Messages, Possible Causes, and Corrective Actions ......................................... 7-2
7.3 Causes of Abnormal Measured Values ......................................................................... 7-5
7.4 Other Conditions ............................................................................................................ 7-6
8. ORP Meter ........................................................................................................... 8-1
8.1 ORP Measurement ........................................................................................................ 8-1
8.2 Maintenance of ORP Sensors ....................................................................................... 8-2
8.3 Checking the ORP Sensor ............................................................................................ 8-3
9. Technical Information ......................................................................................... 9-1
9.1 Measurement Principle of pH Meter (Glass Electrode Method) ................................... 9-1
9.2 Relationship between EMF of Glass Membrane and pH Value ................................... 9-2