Installing The Switchos With Other Hplc Systems; Inputs Connector - LC Packings SWITCHOS II User Manual

Advanced microcolumn switching unit

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Table of Contents

2.5

The electrical connections that are required depend on the nature of the

instrumentation and the desired application. In this section, we provide general

information about how the instrument can be interfaced to equipment from other

manufacturers. The user should also refer to the documentation provided with

this equipment. The Switchos is controlled via the INPUTS connector on the rear

panel and the keypad of the loading pump.

Caution: If you are interfacing the Switchos to instrumentation from other

CAUTION

manufacturers, ensure that input voltages and output voltages are within the

ranges indicated in the specifications (Chapter 7). If you have any questions,

please call LC Packings. The LC Packings warranty will not be valid if the

Switchos is damaged due to interfacing of the system to instrumentation from

third parties.

2.5.1 INPUTS Connector

The positions of the switching valves A and B and the Solvent Selection Valve

(SSV) are controlled by the INPUTS connector (FIGURE 2-6). Contact closure

(relay), TTL and open collector outputs can drive the Switchos inputs.

Caution: Check to make certain that the maximum ratings of the outputs

CAUTION

matches with the requirements of the Switchos Advanced Microcolumn

Switching Unit (Chapter 7).

FIGURE 2-6 Pin-Out INPUTS Connector

To control the switching valves A and B and the SSV:

•

Connect two outputs of the controlling instrument to the Switchos input pins

VALVE A and VALVE B of the INPUTS connector (FIGURE 2-7).

•

Connect the common terminals or the ground terminals of the controlling

instrument to the corresponding GROUND pins of the INPUTS connector

(FIGURE 2-7).

•

Connect the SSV pin and the corresponding GROUND in the same way to

another output of the controlling instrument (FIGURE 2-7).

Controlling

Instrument

Relay

A) Contact Closure (Relay) Output

FIGURE 2-7 Different Output Configurations of the Controlling Instrument

User's Manual Switchos