Calculations When Using An External Flow Meter; Variable-Volume Scenario - Teledyne 6712FR Installation And Operation Manual

Figure 5-3 Variable-Volume Scenario
5.11.2 Calculations when
Using an External Flow
Meter
SAMPLE VOLUME:
10 ml FOR EVERY
___ PULSES
9400 ml
3000 ml
0 1 2
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
From the scenario we can apply the factors for the equation.
10 ml for every 16.7 pulses
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.
6712FR Refrigerated Sampler
Section 5 Extended Programming
3 4 5 6 7
Hours
(Least Total Flow Vol) / (Flow Pulse Vol)
=
(Minimum Required Vol) / (10 ml per unit)
(500,000 gallons) / (100 gallons per pulse)
=
(3,000 ml / 10 ml)
666,667 gal
500,000 gal
8
5-21