10 connection of external devices, 1 connection of the 750 autosampler – Metrohm 790 Personal IC User Manual

Page 55

2 Installation

790 Personal IC

2.10 Connection of external devices

2.10.1 Connection of the 750 Autosampler

The 750 Autosampler available from Metrohm as an option is an auto-

matic sampler for ion chromatography. It accommodates max. 128

samples each of 730 µL, which are automatically transferred to the

sample loop attached to the injection valve of the 790 Personal IC. The

samples on the 750 Autosampler are changed by a remote signal that

is outputted by the 790 Personal IC (790 Personal IC as "Master").
In order to connect the 750 Autosampler the 6.2128.160 Cable that is

available as an option is additionally required. The 750 Autosampler is

connected to the 790 Personal IC as follows:

1 Electrical connection 790 – 750

• Connect 6.2140.010 Connector plug to contact closure strip

10 of the 750 Autosampler (see 750 Instructions for Use).

• Connect one end of the 6.2128.160 Cable to the connections

13 "EXTERNAL INJECT INPUT" and 14 "GND" on the connec-

tor plug. The two cable ends are appropriately inscribed with

"750" (white) and "GND" (brown).

• Connect the other end of the 6.2128.160 Cable to the remote

interface 16

16 of the 790 Personal IC (see Fig. 2).

2 Tubing connection 750 – injection valve

• Pull aspiration tubing 23

23 completely out from feedthrough 4

and screw it off from connection "1" of injection valve 22

22.

• Cut transfer tubing 8888 mounted on the 750 Autosampler (see

750 Instructions for Use) to the shortest possible length be-

tween the needle of the 750 Autosampler and injection valve

22 of the 790 Personal IC.

• Pull the free end of transfer tubing 8888 through the feedthrough

4 on the 790 Personal IC and screw it onto connection "1" of

injection valve 22

22 using a 6.2744.010 PEEK compression fit-

ting.

3 Tubing connection injection valve – waste

• Remove coupling 24

24 and 6.2744.010 Compression fitting

from syringe tubing 25

25.

• Lead free end of syringe tubing 25

25 to the waste container and

fix in place.

4 Settings at the 750 Autosampler

• Set parameter "

Run time

" to

0.0

to activate the external start

of the 750 Autosampler (see section 3.5 of the 750 Instruc-

tions for Use). Filling the sample loop of the injection valve

only takes place when the impulse produced by the 790 Per-