Contents
1. Introduction ..................................................................................... 5
1.1 WP-81 Display and Controls .................................................................. 5
1.2 Unpacking Information ........................................................................... 7
1.3 Specifications ......................................................................................... 8
2. WP-81 Menu Structure .................................................................. 11
3. Operating Modes ........................................................................... 12
3.1 Selecting Conductivity, TDS (setting factor) or Salinity Mode ............. 12
3.2 Selecting pH or ORP (mV) Mode ......................................................... 12
4. Conductivity (TDS/Salinity) Calibration ....................................... 13
4.1 Calibration Procedure .......................................................................... 13
4.2 Calibration Notes ................................................................................. 15
4.3 Calibration Messages .......................................................................... 15
5. pH Calibration ................................................................................ 16
5.1 Calibration Procedure .......................................................................... 16
5.2 Calibration Notes ................................................................................. 17
5.3 Calibration Messages .......................................................................... 18
6. mV/ORP Calibration ...................................................................... 18
7. Temperature Calibration ............................................................... 19
7.1 Calibration Procedure .......................................................................... 19
7.2 Calibration Notes ................................................................................. 19
7.3 Calibration Messages .......................................................................... 20
7.4 Manual Temperature Setting ............................................................... 20
8. Good Laboratory Practices (GLP) ................................................ 21
8.1 To recall GLP information on the display ............................................. 21
8.2 Failed Calibration ................................................................................. 22
8.3 Printing GLP Information to the RS232 Port ........................................ 22
8.4 Instrument Serial Number .................................................................... 23
8.5 Additional GLP Features ...................................................................... 23
9. Notepad Function .......................................................................... 24
9.1 Recording Readings into the Notepad ................................................. 24
9.2 Recalling Records from the Notepad ................................................... 24
9.3 Erasing Records from the Notepad ..................................................... 25
9.4 Printing Records from the Notepad to the RS232 Port ........................ 25
10. Automatic Data logging ............................................................. 26
11. RS232 Port ................................................................................. 28
11.1 Setting the Baud Rate ...................................................................... 28
11.2 Sending Readings to the RS232 Port .............................................. 28
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