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10. Automatic Datalogging .................................................................. 24
11. RS232 Port ..................................................................................... 25
11.1 Setting the Baud Rate ..................................................................................... 25
11.2 Sending Readings to the RS232 Port .............................................................. 25
11.3 RS232 Configuration...................................................................................... 25
11.4 Communication and Statistical Software ........................................................ 25
11.5 Commands ..................................................................................................... 26
11.6 Data Format ................................................................................................... 27
12. Battery Saver Function.................................................................. 28
13. Clock Function............................................................................... 29
13.1 Setting the Clock ............................................................................................ 29
13.2 Displaying or Hiding the Clock ...................................................................... 29
14. Selecting k=0.1 or k=10 Sensors .................................................. 30
15. Selecting pH6.88 or pH7.00 as the Primary Buffer ...................... 31
16. Initialising the WP-81T................................................................... 32
17. Instrument firmware version number. .......................................... 32
18. Troubleshooting ............................................................................ 33
18.1 General Errors................................................................................................ 33
18.2 Conductivity and TDS Troubleshooting.......................................................... 34
18.3 pH Troubleshooting........................................................................................ 36
18.4 Temperature Troubleshooting......................................................................... 37
19. Warranty ......................................................................................... 38
20. Appendices .................................................................................... 40
20.1 Care, Cleaning and Maintenance of Conductivity Electrodes .......................... 40
20.2 Replatinising Conductivity Electrodes ............................................................ 41
20.3 pH Electrode Fundamentals............................................................................ 42
20.4 Checking the reference junction of a pH electrode. ......................................... 44
20.5 Determining if an instrument or pH sensor is faulty........................................ 45