Uecd Analog Output; Recommended Starting Conditions For New Uecd Methods; Uecd Makeup Gas Notes - Agilent Technologies 7890 Series Advanced Operation Manual

5
Detectors

uECD analog output

Recommended starting conditions for new uECD methods

uECD makeup gas notes

186
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.
If you intend to use the analog output from the uECD, you
must set the output Range to 10.
Press [Analog Out 1] or [Analog Out 2].
1
Scroll to Range.
2
Type 10 and press [Enter].
3
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.
Table 47 Starting values
Gas
Carrier gas
Packed columns
(nitrogen or argon-methane)
Capillary columns
(hydrogen, nitrogen, or
argon-methane)
Capillary makeup
(nitrogen or argon-methane)
Temperature
250 °C to 400 °C
Detector temperature is typically set 25 °C greater than the highest oven ramp
temperature.
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.
Recommended flow range
30 to 60 mL/min
0.1 to 20 mL/min,
depending on diameter
10 to 150 mL/min
(30 to 60 mL/min typical)
Advanced Operation Manual