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13.
RS232 Port...........................................................................................36
13.1
Setting the Baud Rate ...................................................................36
13.2
Sending Readings to the RS232 Port ............................................36
13.3
RS232 Configuration .....................................................................36
13.4
Communication and Statistical Software........................................36
13.5
Commands....................................................................................38
13.6
Data Format ..................................................................................39
13.7
GLP Data Format ..........................................................................40
13.8
Importing Data into Microsoft Excel ...............................................41
14.
Battery Saver Function .......................................................................43
15.
Recharging the Battery.......................................................................44
16.
Clock Function....................................................................................45
16.1
Setting the Clock ...........................................................................45
16.2
Displaying or Hiding the Clock .......................................................45
17.
Selecting pH6.88 or pH7.00 as the Primary Buffer ............................46
18.
Initialising the WP-91..........................................................................47
19.
Instrument firmware version number. ...............................................47
20.
Troubleshooting .................................................................................48
20.1
General Errors...............................................................................48
20.2
Dissolved Oxygen Troubleshooting ...............................................49
20.3
pH and mV Troubleshooting ..........................................................50
20.4
Temperature Troubleshooting........................................................51
21.
Dissolved Oxygen Sensor Fundamentals .........................................52
21.1
Operating Principle........................................................................52
21.2
Maintenance Of The Membrane ....................................................53
21.3
Probe Storage ...............................................................................53
21.4
Notes On Units Of Dissolved Oxygen ............................................54
21.5
Equilibrium Conditions...................................................................55
21.6
Velocity Past The Membrane.........................................................56
22.
pH Sensor Fundamentals...................................................................57
22.1
Asymmetry of a pH Sensor............................................................57
22.2
Slope of a pH Sensor ....................................................................58
22.3
pH Temperature Compensation.....................................................59
22.4
Checking the reference junction of a pH sensor.............................59
22.5
Determining if a pH meter or an sensor is faulty ............................60
23.
Warranty ..............................................................................................61