I am trying to quantify ethyl lactate in ethanol 20% (remainder water). When I run multiple injections, the RSD is 6-8% for the ethyl lactate peak. The ethyl lactate standard should be 0.2% v/v. We typically test samples that are 95-100% ethanol and use…
I went back and installed a no-hole ferrule and get a passing air/water check (I assume this rules out the MS interface), but when installing a column to the MS interface with the other end capped, the air/water check fails.
Otis,
This is the reply from Engineering:
the connection refused error indicates that the A-Plus server is not reachable, this can happen for two reasons:
The server has gone into error, in this case it is possible to launch A-plus from a dos…
Hello, I am looking for some advice on how to troubleshoot a small air leak in a 7010 triple quad. The leak is small enough that using an an air can at several of the check points can't detect a leak. So far I changed the side plate o-rings, vent valve…
Instrument: 7890 GC modified for gas injection with a 10-port valco valve. It's dual SS inlet, dual detector FID/TCD.
I have installed some components into the AUX bracket, two heating components into AUX 1 and AUX 2, and a valve actuator in V1. Valve…
In the ChemStation calibration table you can set Peak Qualifiers when using multiple signals. The ratio of the signals is calculated and compared for each compound. In the classic report this is then used also for peak identification. I tried building…
We are using EZChrom and two separate samples, so as to increase throughput and to limit solvent use. 7890A/7683/7683 ALS with dual FID. Thanks, Charles
I’m having problems with my injector. It will move up and down to the seat with no problem but will throw an error and not move down to a sample vial. Errors “Command from COSY list rejected (EE 4080,3061)” “Needle down failed (EE 4018, 16)” Also if you…
GC Inlet Maintenance
Find links and part numbers to the consumables used in the video here.
GC Septum
Inlet septa are used to maintain a leak-free seal at the GC inlet, even after repeated injections.
If the septum has a dimple, the dimple…
This Information Applies To: Agilent Liquid Chromatography (LC) systems
Issue:
Shutting down the HPLC for a long period requires following this general procedure to prevent damage to the system and the column.
Steps to follow:
Store the...
This Information Applies To: Agilent G7129A/B Autosampler with Sample Thermostat/Cooler G7167-60101 or G7167-60005.
Issue:
The autosampler may stop working from time to time, potentially giving off loud noises and switching off the light. The only...
This Information Applies To: Agilent 5977A/B GC/MSD with EI source, EI Extractor Source, or CI Source.
Issue:
During normal operation of the GC/MSD, the source will require cleaning. It is time to clean the source when:
There is a loss in analyte...
This Information Applies To: Agilent HES source, Agilent 5977 Series GC/MSD
Issue:
During normal operation of the GC/MSD, the source will require cleaning. It is time to clean the source when:
There is a loss in analyte response not improving...
This Information Applies To: Agilent 5977 and 5975 Series GC/MSD systems
Issue
The autotune fails and reports the error Tune action stopped: Gain and offset = 0 and peaks are too narrow!
Resolution
The MSD autotune program is run after routine...
This Information Applies To: Agilent ICP-MS systems (7700/7800/7850/7900/8800/8900)
Issue
Condition new or cleaned ICP-MS skimmer cones and sampler cones by aspirating a Conditioning Solution before use.
Background
Drift up can be a sign of...
Turn On the GC/MS Interface and Oven Using OpenLab CDS
Multiple Results
This Information Applies To: Agilent GC/MS instruments controlled by OpenLab CDS software
Issue
Turning on the GC/MS interface heater and Oven using OpenLab CDS software.
Steps to Follow
From the Home tab, click Method > Instrument Setup...
This Information Applies To: Agilent ICP-MS systems (7700/7800/7850/7900)
Issue
The signal monitor function in MassHunter can help with troubleshooting low sensitivity, carry over, contamination, or high background. It can also be used to optimize...
This Information Applies To: Agilent UV detectors (Variable Wavelength Detectors, Multiple Wavelength Detectors, and Diode Array Detectors)
Issue
Checking accumulated hours on the UV lamp.
Steps to Follow
There are four ways to check the accumulated...
This Information Applies To: Agilent 7700/7800/7850/7900/8800/8900 ICP-MS
Issue:
Poor internal standard (ISTD) mixing can cause high relative standard deviation (RSD).
The recommendations in this article are applicable if:
It takes a long...