This Information Applies To: Agilent 7697A headspace sampler.
The headspace sampler may present a flow shutdown or poor chromatography with decreased area counts or shifted retention times, caused by leaks or restrictions in the sampler. The hardware has a built-in restriction and pressure decay test that can be utilized to help with troubleshooting.
Things to know about the test:
|Six Port Valve Cap
|No Hole Ferrule
|Blue Leak Test Vial
|1/8-inch Nylon Swagelok plug
Steps to Follow:
If the test Fails:
Failure at Restriction Test 1/3: Sample Probe (without sample loop in line)
Failure at Restriction Test 2/3: Sample Probe (with sample loop in line)
Tips: If the sampler has been running water samples that have been saturated with inorganic salts, these salts may have got in the probe and the valve. The valve can be removed and cleaned by removing the rotor and cleaning the 6 ports of the valve body with a cleaning wire (9301-0985). Contamination of the Flow Block Weldment is the least likely cause of the problem, unless higher boiling compounds are being analyzed. These tend to condense out in the condensation coil and block the Weldment.
Failure at Restriction Test 3/3: Vent Line
Failure at Pressure Decay Test 1/3:
Failure at Pressure Decay Test 2/3:
Failure at Pressure Decay Test 3/3
If the test Passes:
Restore the instrument to operating condition.
If the test passes all stages, the sampling system is leak free. If still experiencing leak-like symptoms or poor chromatography
Learn how to effectively troubleshoot your 7697A:
SI-7697A-2260r - How to Run the Agilent 7697A Headspace Sampler Restriction and Leak Tests e-learning available from Agilent education.
Leak Testing the Headspace Sampler user manual on Agilent.com.