186 Advanced Operation Manual
5 Detectors
elution temperature of the last compound. If you operate at
excessively high temperatures, your results will not
necessarily improve and you may increase sample and
column decomposition.
uECD analog output
If you intend to use the analog output from the uECD, you
must set the output Range to 10.
1 Press [Analog Out 1] or [Analog Out 2].
2 Scroll to Range.
3 Type 10 and press [Enter].
Recommended starting conditions for new uECD methods
Use the following information when selecting temperatures
and flows. Maximum source pressure must not exceed 100
psi. Use the maximum source pressure to achieve maximum
makeup flow rate.
uECD makeup gas notes
If the carrier gas type is different from the makeup gas type,
the makeup gas flow rate must be at least three times the
carrier gas flow rate.
uECD sensitivity can be increased by reducing the makeup
gas flow rate.
Tabl e 47 Starting values
Gas Recommended flow range
Carrier gas
Packed columns
(nitrogen or argon-methane)
Capillary columns
(hydrogen, nitrogen, or
argon-methane)
30 to 60 mL/min
0.1 to 20 mL/min,
depending on diameter
Capillary makeup
(nitrogen or argon-methane)
10 to 150 mL/min
(30 to 60 mL/min typical)
Temperature
250 °C to 400 °C
Detector temperature is typically set 25 °C greater than the highest oven ramp
temperature.
To Next Page
Loading...
Need help?
General
