Bacharach HI FLOW Sampler, Instruction, Page: 41 / 72

Hi Flow Sampler Operation
Instruction 0055-9017
37
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.
1 1 / 2 2 / 0 4 0 9 : 4 7 : 1 5
B a c k ( % ) 0 . 8 0
L e a k ( % ) 1 5 . 0 0
L e a k ( l p m ) 4 2 . 5
S p e e d ( L O < > H I )
S a v e
S a m p l e T i m e - > 0 1 : 4 5
[ 0 0 0 1 ] ( M ) - 1 -
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.
1 1 / 2 2 / 0 4 0 9 : 4 9 : 0 0
B a c k ( % ) 0 . 8 0
L e a k ( % ) 1 8 . 0 0
L e a k ( l p m ) 4 0 . 8
S p e e d ( L O < > H I )
S a v e
S a v e
S a m p l e T i m e - > 0 3 : 3 0
[ 0 0 0 1 ] ( M ) - - 2
9. Saved measurements can downloaded to a personal computer at a
later time for analysis. Refer to Section
3.16 Importing Saved Data
into a Spreadsheet .