Heath Consultants Hi Flow Sampler - Manual (Page 33)

Hi Flow

Sampler Operation
Instruction 0055-9017 33
5. The user is now asked to choose a new or different Test ID.
Selecting Yes causes the Access Records menu to appear (refer to Section 2.15).
After selecting or creating a new Test ID, start the measurement by pressing ESC
until the Main Screen appears. Selecting No returns the display to the Main Screen
and starts the measurement using the current Test ID.
6. (Optional) The instrument normally controls the flow rate for measurements #1 and
#2; however, the user can manually set the flow rate using the Speed function. Each
press of the I/O ↵ key will lower the flow rate as indicated by the speed bar moving
to the left.
7. After both measurements are complete, 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 examples below, the measured leak concentration was 15% gas during the first
measurement and 18% gas in the second, while the calculated leak rates were 42.5 and
40.8 lpm, respectively. A difference of 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.
8. When in the automatic mode, measurements are automatically saved. These saved
measurements along with their associated Test IDs can be downloaded to a
personal computer at a later time for analysis. Refer to Section 2.16 Importing
Saved Data into a Spreadsheet.