Heath Consultants Hi Flow Sampler - Manual (Page 35)

Hi Flow

Sampler Operation
Instruction 0055-9017 35
7. Once a stable leak measurement is obtained, highlight Save and press the I/O
↵ key. Observe that the measurement is saved in memory, and that the flow rate is
automatically lowered.
In the example below, the measured leak concentration for measurement #1 was
15% gas, and the calculated leak rate was 42.5 lpm.
8. Continue sampling at the reduced flow rate until once again a stable leak
measurement is achieved. If desired, the flow rate can again be manually
controlled by using the Speed function.
With Save highlighted, press the I/O ↵ key to save measurement #2 in memory. The
blower then stops and the values in the Main Screen are put on hold (as indicated by
“H--” appearing at the bottom of the screen), allowing the user to make note of these
values before turning off the instrument or proceeding to the next measurement.
In the example below, the leak concentration was 18% gas, the leak rate was
40.8 lpm, and the percent difference between measurements #1 and #2 was 4%.
IMPORTANT: For a test to be considered valid, the percent difference between
measurements #1 and #2 must be less than 10%. Scroll up to the #1–#2 function on
the Main Screen to see the percent difference between the last two measurements.
9. Saved measurements can be downloaded to a personal computer at a later time for
analysis. Refer to Section 2.16 Importing Saved Data into a Spreadsheet.
2.18.4 Leak Rate Measurement – Manual 1-Stage Mode
Note:
The Manual 1-Stage Mode can only be selected if operating in the Expanded Menu
Mode. Refer to Section 2.8.
1. If not already done, place the instrument into its Manual 1-Stage mode. Refer to
Section 2.14.2.2.