Metrohm 731 User Manual

731 Relay Box

Manual

8.731.1003

Metrohm AG
CH-9100 Herisau
Switzerland
Phone [phone]
Fax [phone]
[e-mail]
www.metrohm.com

731 Relay Box

8.731.1003

Manual

05.1998 dm

Teachware
Metrohm AG
CH-9100 Herisau
[e-mail]

This documentation is protected by copyright. All rights reserved.

Although all the information given in this documentation has been
checked with great care, errors cannot be entirely excluded. Should you
notice any mistakes please send us your comments using the address
given above.

Documentation in additional languages can be found on

http://documents.metrohm.com.

Contents

1 Overview _____________________________________________1

1.1 Range of applications ________________________________ 1

1.2 Possible applications_________________________________ 1

1.3 Instrument description________________________________ 2

1.3.1 Front view.................................................................................... 2

1.3.2 Rear view.....................................................................................3

2 Installation___________________________________________ 4

2.1 Instrument setup_____________________________________ 4

2.1.1 Line supply.................................................................................. 4

2.2 Safety information ___________________________________ 7

2.3 Setting the DC output voltage__________________________ 9

2.4 Connections _______________________________________ 10

2.4.1 Remote control via remote lines................................................10

2.4.2 The Metrohm remote socket..................................................... 11

2.4.3 The 731 Relay Box and remote lines.........................................13

2.4.4 Connection cable......................................................................13

2.4.5 Application examples ............................................................... 15

3 Settings _____________________________________________21

3.1 Possible settings ___________________________________ 21

3.2 Inverting___________________________________________ 22

4 Technical specifications ___________________________23

5 Warranty and certificates __________________________25

5.1 Warranty __________________________________________ 25

5.2 EC Declaration of Conformity _________________________ 26

5.3 Certificate for conformity and system validation _________ 27

6 Accessories _________________________________________28

7 Index ________________________________________________29

Relay box 731, Instructions for use

1 Overview

1.1 Range of applications

The Metrohm 731 Relay Box is a versatile auxiliary instrument which
can be used in may different ways for switching various peripheral
devices in complex automated systems. It has been designed
specially for factory and laboratory use and makes a wide range of
applications possible. Together with a control instrument that is able
to set parallel remote lines, the 731 Relay Box allows the individual
switching of instruments that have no communication interfaces of
their own.

1.1 Range of applications

Thanks to the adjustable output level of the low-voltage direct
current outputs a wide range of instruments can be powered and
switched.

This means that you are able to assemble your laboratory
automation system according to your specific requirements.

1.2 Possible applications

The 731 Relay Box can be controlled by any Metrohm instrument (or
by an instrument from other manufacturers) that possesses a remote
output whose output lines (TTL level, 5 volt) can be set freely (e. g.
726 Titroprocessor, 730 Sample Changer, 711 Liquino) or which can
be set so that they are automatically event-controlled during a
method run (e.g. Titrinos, Metrohm pH meters).

Via the 230/110 volt current sockets (AC1 and AC2), instruments
such as pumps, heaters, coolers can be supplied with electricity.

Instruments that require a direct current supply voltage of between 5
and 24 volts or that can be controlled by voltage pulses, e.g. pumps
or Dosimats, can be connected to the low voltage direct current
outputs (DC1 and DC2).

Relay box 731, Instructions for use

1

1. Overview

DC2

1.3 Instrument description

1.3.1 Front view

INVERT

OFF ON

DC 1
DC 2
AC 1
AC 2

Inverter switches
(dip switches)

Fields for magnetic

marking labels

731 Relay Box

DC 1

DC 2

AC 1

AC 2

POWER

Operating elements
direct current output
DC1

Operating elements
direct current output

Operating elements
line output AC1

Operating elements
line output AC2

Instrument status
(LED)

Removable protective
cover

2

Relay box 731, Instructions for use

1.3.2 Rear view

Fixing screws for
protective cover

1.3 Range of applications

Identification
plate

Remote connection

IN (input)

Direct current output

DC1

Direct current output

DC2

Line voltage

outputs

AC1 and AC2

Remote connection
Out (output)

Banana
sockets DC1

Jack socket
DC1

Banana
sockets DC2

Jack socket
DC2

Fuse holders
AC1 and AC2
(line voltage
outputs)

Line connector

Relay box 731, Instructions for use

Line switch

Fuse holder (main fuse)
and voltage selector

3

2. Installation

2 Installation

2.1 Instrument setup

Packaging

The 731 Relay Box is supplied together with the specially packed
accessories in packaging containing shock-absorbing foam which
provides excellent protection. Please store this packaging as it guar­antees damage-free transport of the instrument.

Checks

Please check immediately on receipt whether the shipment is com­plete and undamaged (compare with delivery note and list of acces­sories in section 6). If transport damage is established please refer
to section 5.1 'Warranty'.

Location

The 731 Relay Box is a robust instrument and can therefore be used
even in rough conditions in factories and laboratories.
However, care should be taken that it is not exposed to a corrosive
atmosphere. Regular care of the instrument is essential if it is used
in rough surroundings.

If an instrument that has been stored at low temperatures is brought
into a heated room then the atmospheric humidity may cause water
to condense inside the instrument. In order to avoid damage to the
instrument, at least one hour should be allowed to elapse before it is
switched on.

2.1.1 Line supply

Follow the instructions given below for connection to the line supply.
If the instrument is operated with the line voltage incorrectly set
and/or the wrong line fuse there is a fire hazard!

Setting the line voltage

Before switching on the 731 Relay Box for the first time check that
the line voltage set on the instrument (see diagram on following

4

Relay Box 731, Instructions for use

page) corresponds to the local line voltage. If this is not the case

230

115

then the correct line voltage must be set as follows:

Pull out line cable

Remove fuse holder

Line connector

2.1 Instrument setup

• Pull the line cable out of the line connector of the

731 Relay Box.

• Use a screwdriver to loosen the fuse holder beside the line

connector and pull it out completely.

Fuse holder
(main fuse)

Voltage selection insert with
voltage display

Line switch

Checking and replacing the main fuse

• Carefully remove the fuse from the fuse holder and check its

specifications:

220…250 V 10A (slow-blow) Metrohm no. U.600.0026

• Exchange the fuse if necessary and reinsert it in the fuse

holder.

Make sure that the instrument is never operated with any other type of
fuse as otherwise there is a fire hazard!

Change line voltage

• Carefully remove the voltage selector insert with the help of a

screwdriver and rotate it. Replace the insert so that the required
voltage is visible in the fuse holder window.

Relay Box 731, Instructions for use

Replace fuse holder

• Insert the fuse holder and click it into position by pressing it down

strongly with a finger.

5