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seal calibration passed!!!! But suspicious about numbers
Posted: Thu Mar 01, 2012 5:04 pm
by hplctroubleshooting
up seal-360
down seal-70
seal width-40
the up seal numbers don't seem right, but the test passed (717 plus autosampler Waters LC) , do higher numbers indicate a better seal or a worse off seal? Should I move the needle platform more upwards or downwards?
Re: seal calibration passed!!!! But suspicious about number
Posted: Thu Mar 01, 2012 6:10 pm
by Hollow
as far as I remeber:
The numbers are steps of the needle motor, so in fact give the position of the upper and lower seal.
Nothing to do with sealing quality. For this, use the compression check (>purge injector, use a column for backpressure when purging injector and compression check).
The seal width is the space between the seals, where the needle is in place for injection and during the whole run.
If compression check is ok, you should be fine.
Re: seal calibration passed!!!! But suspicious about number
Posted: Thu Mar 01, 2012 8:39 pm
by hplctroubleshooting
as far as I remeber:
The numbers are steps of the needle motor, so in fact give the position of the upper and lower seal.
Nothing to do with sealing quality. For this, use the compression check (>purge injector, use a column for backpressure when purging injector and compression check).
The seal width is the space between the seals, where the needle is in place for injection and during the whole run.
If compression check is ok, you should be fine.
the compressibility test did not pass, got the message "compressibility exceeds limit", tried the valve tests and all of them seem to work out just fine.
Re: seal calibration passed!!!! But suspicious about number
Posted: Thu Mar 01, 2012 8:41 pm
by hplctroubleshooting
btw, with all due respect, the "up seal count" still seems a bit skewy to me, compared to the numbers that I see online....