Version 1 .0
38 |
•
Weigh 4 empty, clean BOD bottles.
•
Dispense water into the 4 empty, tared bottles for 5, 10, 15 and 18 seconds respectively.
•
Measure the weight of water in each bottle.
Time Delay
0
seconds
Flow Rate
14.500
ml/s
Water density applied: 1.00 g/ml. For more accuracy, use the actual density
TIME (s)
EMPTY
WT (g)
FUll WT (g)
H2O WT (g)
ExPECTED
WT (g)
OFF FROM ExCEPTED
(g)
REQUIREMENT
5
26.45
97.21
70.76
72.5
2.4%
<5%
10
26.9
163.03
136.13
145.0
6.1%
<2%
15
26.41
222.22
195.81
217.5
10.0%
<2%
18
26.48
258.42
231.94
261.0
11.1%
<2%
•
Draw a curve of volume dispensed Vs time and Time Vs volume (see graphs below).
•
The intercept (0.827) of the left curve is the Dilution Water Pump Delay (also called Time Delay) of the unit being calibrated.
•
Type the Time Delay in the field Dilution Water Pump Delay in the "
Admin-tools
" tab.
•
The slope (12.36) of the right curve is the flow rate. Type this flow rate in the field Dilution Water Pump flow rate in the "
utilities
" tab.
•
Validate these settings by repeating step 3-7.
•
If the "% off from expected" does not meet the requirements, start again from step 10.
•
Once the % off requirements are met, the new dilution pump calibration is finished.
9 .3 NEW SEED PUMP CAlIBRATION
•
Put the end of the seed pump tubing into a bottle of clean water.
•
In "
utilities
", Prime the seed pump. Make sure the dispensing line is filled with water and has no air bubbles.
•
Weigh 3 empty, clean BOD bottles.
•
Dispense water into three empty, tared bottles for 5, 10 and 20 ml respectively.
•
Measure the weight of water in each bottle and convert to volume.
•
Calculate the average ratio (ex. 1.055) of volume dispensed/volume required for the three samples.
•
In "
utilities
"/"
seed PumP
", in the field "Set", type the value 1, and in the field "Measure", type the average ratio value (ex. 1.055).
•
Press "Calibrate". The new flow rate will be calibrated.
