Microseal Performance
Microseals function well over the entire range of GC injection
port temperatures (50 - 400C) and within the specified pressure
ranges of 3 - 100 psi (20 - 690 Kpa) for the General Purpose and
SPME versions and 1-45 psi (7 -310 Kpa) for the Low Pressure
version. The resistance to wear is valuable in keeping the injection
port liner free of septum particles which can cause sample
adsorption or decomposition.
Microseal lifetimes can vary depending on sample composition,
operating conditions and laboratory environment. Lifetimes range
from over 10,000 injections to as few as 1,000.
When leaks occur they are typically caused by the accumulation
of material in the duckbill lips. Traces of samples containing
derivitizing reagents or high concentrations of non-volatile
material can leave traces on the needle tip. The residue can
gradually accumulate in the duckbill lips which can interfere
with the ability of the duckbill to seal. A small amount of glass
wool in the injection port liner can wick away sample from the
tip of the needle to alleviate this problem. Microseal leaks add
to the septum purge flow and are not as critical as leaks at a
column fitting, for example.
Safety
Read and follow the directions and safety precautions in the
instrument manual for replacing the septum.
1. The injection port and nut may be hot.
2. The injection port may be under pressure.
3. Wear safety glasses as you always do in the laboratory.
4. Use particular caution with flammable carrier gases like
hydrogen.
Part Description
Part #
For Agilent Instruments
Low Pressure Microseal Kit (nut & 2 #978422 Microseals)
979400
Low Pressure Microseal Kit (nut & 1 #978422 Microseals)
978465
General Purpose Microseal Kit (nut & 2 #978412 Microseals)
979989
General Purpose Microseal Kit (nut & 1 #978412 Microseals)
977495
Microseal Nut
979980
For Shimadzu Instruments
Microseal Kit for Shimadzu (nut, adapter assembly & 2 #978412 Microseals)
979990
For Bruker/Varian Instruments
Microseal Kit for Varian 1079 (nut, adapter, o-ring & 1 #978412 Microseals)
979987
Microseal Kit for Varian 1177 (nut, adapter, o-ring & 1 #978412 Microseals)
979988
For PerkinElmer Instruments
Microseal Kit for PerkinElmer (nut, adapter, o-ring & 2 #978412 Microseals)
979986
Replacment Microseals
Low Pressure Microseal (1 to 45 psi)
978422
General Purpose Microseal (most applications, 3 to 100 psi)
978412
Microseal for SPME Applications (3 to 100 psi)
979985