Teledyne manual 6712FR Refrigerated Sampler Extended Programming, 3 Variable-Volume Scenario

6712FR Refrigerated Sampler Section 5 Extended Programming

9400 ml

3000 ml

w

lo

F

d

e

ct

e

w

xp

lo

E

d

F

st

e

e

ct

at

e

p

e

x

r

t

E

G

s

a

e

L

666,667 gal

500,000 gal

0	1	2	3	4	5	6	7	8
				Hours

Figure 5-3 Variable-Volume Scenario

5.11.2Calculations when Using an External Flow Meter

SAMPLE VOLUME: 10 ml FOR EVERY

___ PULSES

The highest possible SAMPLE VOLUME value is determined by the minimum volume required for analysis and the least expected flow rate over the sampling duration. To calculate the number of pulses at this high end of the range, you should know:

•the least expected flow volume that will pass the flow measurement point

•the flow volume interval between each flow pulse from the external flow meter

•the minimum composite sample volume required for analysis. Allow for duplicates and spillage.

These factors would be applied to the following equation.

10 ml for every __ pulses =

(Least Total Flow Vol) / (Flow Pulse Vol)

(Minimum Required Vol) / (10 ml per unit)

From the scenario we can apply the factors for the equation.

(500,000 gallons) / (100 gallons per pulse)

10 ml for every 16.7 pulses =

(3,000 ml / 10 ml)

Because the SAMPLE VOLUME entry must be in whole numbers, 16.7 is rounded down to 16. It is important to note that this number is inversely proportional to the amount of volume collected. Rounding up would result in less volume collected.

The lowest possible SAMPLE VOLUME value is dependent upon the highest expected flow and the available bottle volume. To cal- culate the number of pulses or volume at this low end, you should know:

•the greatest expected flow volume that will pass the flow measurement point

•the flow volume interval between each flow pulse from an external flow meter

•the available bottle volume for sample collection.

5-21