Hach-Lange BODTRACK II User Manual - Manual (Page 22)

bottle fence. Move the tubing counter-clockwise and secure the bottle
cap inside the fence.
Troubleshooting
Incorrect BOD curves
Figure 4 shows incorrect BOD curves for a 10 day test period. For typical
curves, refer to Typical curves on page 17.
Figure 4 Incorrect curves
1 High oxygen demand 4 Initial sample temperature below
20 ºC or supersaturated with
oxygen
2 Nitrification 5 Bottle leak
3 Excessive time lag
High oxygen demand
Refer to Figure 4 on page 20. Samples that are above range (for
example, a BOD over 350 mg/L when a 160-mL sample is taken) will
20 English