Agilent Technologies 1100 Series Manual de Instruções descarregar pdf (Página 67)

1100 Series Capillary LC System Manual 57

Basic System Troubleshooting 4

System Pressure Abnormally High

Symptoms:

The current system pressure is significantly above the typical system pressure

produced by this method with this column.

System Pressure Abnormally High: Possible causes and actions

Possible Causes Suggested Actions Notes

The analytical column has

become plugged

• Replace the column. Otherwise, backflush the

column or replace the column inlet frit.

The filter in front (upstream)

of the EMPV has become

plugged

• Perform a pump purge at 1000 µl/min using

pure water. During the purge, check system

pressure. If pressure is >10 bar, replace the

EMPV filter.

If a new filter does not reduce the

pressure, replace the mixer.

A component in the

micro-sampler has become

plugged. This could be the

sample loop, needle, needle

seat assembly or injection

valve ports.

• Using the sampler maintenance positions,

switch the sampler injection valve from

mainpass to bypass. If pressure is significantly

reduced:

a Backflush or change the needle seat assembly.

b Replace the needle.

c Backflush or replace the sample loop capillary.

d Replace the injection valve rotor seal.

e Clean the stator head with acetone, and make

sure the stator head ports are free of particles.

For severe capillary tube plugs,

acetone is a good backflushing

solvent.

A pre-sampler, or

post-sampler capillary in the

system has become plugged,

broken, crushed by a module

cover or overtightened.

• Refer to the system flow diagram. One at a

time, disconnect the capillaries in the following

order. When the defective capillary is found, it

may be backflushed with acetone, or replaced.

a EMPV-to-flow sensor capillary

b flow sensor-to-sampler injection valve capillary

c sampler injection valve-to-column inlet

capillary

d flow cell assembly (includes inlet and outlet

capillaries)

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Agilent Technologies 1100 Series Manual de Instruções Página 67

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