Agilent Technologies SD-1 User Manual page 96

8
Maintenance and Repair
Cleaning Check Valves
Cleaning Check Valves with 20 % Nitric Acid
If the above cleaning procedure does not restore normal performance, you
can try using 20 % nitric acid to dissolve the deposits.
1 Remove the check valve from the pump head.
Chemical burns to eye, skin and respiratory tract
WARNING
A 20 % nitric acid solution is a strong acid. Strong acids are extremely corrosive and
pose severe risks.
➔
➔
2 Soak check valve in 20 % nitric acid for ten minutes.
3 Carefully remove the check valve from the acid bath and rinse thoroughly
4 Reinstall the check valve on the pump head.
If this procedure fails to correct the problem you should replace the check valve as
N O T E
described in
96
Observe all standard laboratory safety precautions when using strong acids.
Always wear appropriate personal protective equipment.
with deionized water.
"Replacing Check Valves" on page 97.
SD-1 Solvent Delivery - User Manual