Replacement Parts And Accessories - Hach Lachat QuikChem Bedienungsanleitung

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Table 3 Troubleshooting guide (continued)

Problem

Solution

Poor recovery of a QC sample

Make sure that the reagents are made fresh.

that consists of complex-

Make sure that sample flows through all pump

cyanide

lines.

Make sure that the temperature agrees with

the QuikChem method.

Look at the small hole on the top of the

instrument to see if the UV lamp is turned on. If

not, replace the lamp.

Poor or no recovery of a QC

Examine the pump tubes for flow.

sample

Examine the temperature setting.

Make sure that the reagents are made

correctly.

For the cyanide determination, make sure that

the acid line is put in the digestion solution.

Examine the pump tubes for the acid, the

sample and the acceptor.

Read the QuikChem method notes to learn

more about the expected recoveries.

Table 3 Troubleshooting guide (continued)

Problem

Solution

Air flow though the diffusion

Make sure that there are no blockages or

block gets very fast, then slows

crimps in the reagent and samples tubing.

almost to a stop

Make sure that the waste tubing flows freely. If

not, there is excessive back pressure.

Make sure that the instrument waste goes into

a waste container that is applicable for that

solution. Make sure that the tubing is above

the liquid level and that the container is vented

to prevent pressure inside the container. To

prevent cavitation and vapor lock, the waste

container must be at the same level as the

instrument.

Examine the reagent and water bath tubing for

plugs or crimps. Small dirt particles or algae

from a dirty water bath causes flow problems.

Imprecision when running

Examine the timings in

replicates

on page 11.

Replace the bubble trap membrane.

Make sure that all pump tubes are in good

condition and that there is good liquid flow.