Hach BODTrak, Instrument Manual, Page: 6 / 63

v
CERTIFICATION ....................................................................iii
SPECIFICATIONS .................................................................vii
SAFETY .................................................................................... ix
OPERATION ............................................................................. 1
SECTION 1 INTRODUCTION ................................................ 3
1.1 Before Operating the BODTrak Instrument ................... 3
1.2 Unpacking the BODTrak Instrument ............................. 3
1.3 Applying Power.............................................................. 4
1.4 The BOD Test ................................................................ 4
SECTION 2 INSTRUMENT OPERATION ............................ 7
2.1 Principles of Operation................................................... 7
2.1.1 Oxygen Transfer to Sample ................................... 7
2.1.2 Pressure Sensor Function ....................................... 7
2.1.3 Removing Carbon Dioxide .................................... 7
2.2 Key Functions................................................................. 8
2.3 Setting the Clock .......................................................... 10
2.4 RS232 Interface ............................................................ 11
2.4.1 Hardware Configuration....................................... 11
2.4.2 Commands............................................................ 12
2.4.3 Downloading and Printing Test Results............... 16
SECTION 3 THE BOD TEST ................................................ 19
3.1 BODTrak Test Procedure ............................................. 19
3.2 Interpreting Test Results .............................................. 26
3.2.1 Bottle Leak ........................................................... 26
3.2.2 Time Lag .............................................................. 27
3.2.3 High Oxygen Demand.......................................... 27
3.2.4 Nitrification .......................................................... 27
3.3 Accuracy Check ........................................................... 28
SECTION 4 SPECIAL CONSIDERATIONS ....................... 31
4.1 Range and Volume Selection ....................................... 31
4.2 Sample Dilutions .......................................................... 31
4.2.1 When Oxygen Demand Exceeds 700 mg/L ......... 31
4.2.2 Preparing Several Identical Samples.................... 32
4.3 Sample Seeding ............................................................ 32
TABLE OF CONTENTS
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