Hitachi ZA3000 Series Instruction Manual page 520

Symptoms
3. Absorption signal does
not appear (while AAS
is normal)
4. Absorption sensitivity is
too low
5. Bine is poor.
(Ambient environment is
normal)
6. Reproducibility is poor.
(Ambient environment is
normal)
Causes (check methods)
Tube is not connected from HFS-4 to a
heat absorption cell.
(Check connecting tube.)
Condensation has occurred inside
connecting tube (particularly in Se
measurement).
(Check connecting tube.)
Argon gas flow rate is abnormal.
(Check argon gas supply pressure.)
Reagent concentration is too low.
(Check bubbles in separator.)
Absorption cell is deteriorated (cell has
become white.)
Condensation has occurred inside
connecting tube (particularly in Se
measurement).
(Check connecting tube)
Tip of drain tube is dipped into waste
liquid.
(Check the waste drain bottle)
Argon gas flow rate is inadequate.
(Check argon gas supply pressure)
NaBH is deteriorated.
4
(Check if the reagent is fresh.)
Pump warm-up is inadequate.
Reagent deteriorated or polluted.
(Check an adjustment day.)
Reagent concentration is unusual.
(Check bubbles in separator.)
Argon gas flow rate is inadequate.
(Check argon gas supply pressure.)
5 - 4
Remedies
Connect the tube.
Eliminate condensation or
replace the connecting tube.
Adjust supply pressure to
500 kPa
Prepare reagent again.
Replace the absorption cell.
Eliminate condensation or
replace the connecting tube.
Discard waste liquid
Adjust the length of tube.
Adjust supply pressure to
500 kPa.
Prepare the reagent again.
Warm up for about 10 min.
Prepare reagent again.
Prepare reagent again.
Adjust supply pressure to
500 kPa.