Waters Autospec Premier Operator's Manual page 246

Chromatogram with peak areas displayed
To calculate the EI sensitivity
Calculate the EI sensitivity using the following equation:
60A
S
×
--------------------- -
=
9
×10
1.07
Where
S is the EI sensitivity in coulombs/µg.
A is the average area of the peaks in bit-minutes, as determined in
process the data" on page
bit-minutes to bit-seconds).
1.07 × 10
the EPC.
1.00 × 10
maximum response.
G is the gain, as determined in
page 7-84.
The EI sensitivity must be at least 5 × 10
value is less than this value, contact Waters for advice.
See "Waters contact information" on page
7-88 Routine maintenance
6 –
×10
1.00
------------------------ -
G
7-87; multiply this value by 60 to convert from
9
is the maximum response of the analog-to-digital converter in
-6
is the ion beam current, in amps, that would produce the
"To measure the detector gain" on
-7
coulombs/µg. If the calculated
i-iv.
"To