CP-3800 GC Operator’s Manual
143
ECD Pneumatics
The 3800 GC is tested at the factory at the flow rates listed in the
Getting
Started
manual, Table 2. Use these flow rates as a starting point. Adjust the
flow rate at the pneumatics panel before you use the detector. Measure the
flow rate at the exit tube of the ECD cell.
You may need periodically to clean the detector cell with carrier gas. Flow
rates for the thermal cleaning procedure are also listed in the
Getting Started
manual, Table 2.
Refer to the installation section for a list of gas filters recommended for
packed column or capillary applications.
Note:
Each ECD kit is equipped with a Teflon® flow tube assembly. When
setting/checking the flow rate, attach the end of the flow tube with the ferrule to
the 1/16-inch OD exit tube of the ECD cell. Attach the other end of the flow tube
assembly to a flowmeter. To prevent cross-contamination between detectors, use
the flow tube only with the ECD and store the assembly with the ECD kit.
WARNING:
RADIATION SOURCE
After prolonged use of the ECD detector, radioactive
contaminants may build-up on the detector cap and exit
tube. In such cases, it is possible that you could come in
contact with radioactive material when checking or
adjusting the carrier gas flow rate. Refer to Radiation
Safety Manual. Always wash your hands after handling
the top of the ECD.
Table 25 ECD Gases, Pressures, Purity, and Flow Rates
Gas
Inlet Pressure at
Gas Cylinder
Minimum
Purity
Recommended
Flow Rate (mL/min)
Carrier:
N
2
, He, or Ar/CH
4
(90:10)
80 psig
99.999%
30 (packed column)
≤
5 (capillary columns)
Detector Make-Up (capillary):
N
2
or Ar/CH
4
80 psig
99.999%
20 to 30
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