INFICON Protec P3000(XL) Helium Leak Detector - Manual (Page 79)

Equipment Settings
4-24
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in
a
26
e Ch
ap
te
r
4
.fm
Tech
ni
ca
l Ha
nd
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ok
(1
20
9)
Converting an output
voltage to a leak rate
If the recorder outputs a certain voltage and you want to convert this to a leak rate,
the following formula applies:
(2 is used since one decade is spread over 2 Volts. 3 is used because the trigger
level will always be within the range of 3 to 5 V).
Example calculations:
Trigger
Trigger
exponent Output
voltage
Leak rate
0.1 oz/yr -1 5.35V
3 g/a 0 5.60V
6.4V
5 x 10 -4
mbar l/s
-4 2.8V
6.556V
leak rate
⋅
10
Trigger onent exp
⋅ U 3 –
2
------------- +
=
10
1 –
5 35
,
3 –
2
--------------------- +
1 5oz
,
yr
⁄
=
10
0 –
5 6
,
3 –
2
------------------ +
20g a
⁄
=
10
0 –
6 4 , 3 –
2
---------------- +
50g a
⁄
=
10
4 –
2 8 , 3 –
2
------------------ +
8 10
⋅ 5 –
mbarl s
⋅
=
10
4 –
6 55 , 3 –
2
--------------------- +
1 5mbarl s
⋅ ,
=