4 the methods, Method 2 – Metrohm 813 Compact Autosampler User Manual

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Operation

813 Compact Autosampler

3.4 The methods

All methods of the 813 Compact Autosampler make use of the

built-in peristaltic pump to aspirate the sample and to fill the

sample loop of the Ion chromatograph connected. The pump du-

ration is controlled by the time program of the Ion chromato-

graph's PC software by sending Remote signals to the Autosam-

pler.

The number of samples to be processed is to be set in the sam-

ple queue of the control software. The Autosampler should be

stopped manually after processing the last sample.

Method 1 (detailed command sequence, see section 4.2 Se-

quences)

Single determination with air gap after each run, needle lifted after

sample transfer.

Sequence:

1. Await first Remote signal of the instrument.
2. Get sample tube and immerse needle.
3. On receiving second Remote signal, switch on the peristaltic

pump. Sample is transferred.

4. Await third Remote signal. The instrument starts its determi-

nation.

5. Peristaltic pump is switched off after 12 s.
6. Raise needle out of sample and aspirate air for 6 s.

Method 2

(detailed command sequence, see section 4.2 Se-