wtw inoLab pH 720 User manual

Accuracy when
going to press
The use of advanced technology and the high quality stan-
dard of our instruments are the result of continuous develop-
ment. This may result in differences between this operating
manual and your instrument.
We cannot guarantee that there are absolutely no errors in
this manual. We are sure you will understand that we cannot
accept any legal claims resulting from the data, figures or
descriptions.
Warranty
declaration
The designated instrument is covered by a warranty of three
years from the date of purchase.
The instrument warranty extends to manufacturing faults
that are determined within the period of warranty.
The warranty excludes components that are replaced during
maintenance such as batteries, etc.
The warranty claim extends to restoring the instrument to
readiness for use but not, however, to any further claim for
damages. Improper handling or unauthorized opening of the
instrument invalidates any warranty claim.
To ascertain the warranty liability, return the instrument and
proof of purchase together with the date of purchase freight
paid or prepaid.
Copyright ©Weilheim 2004, WTW GmbH
Reprinting - even as excerpts - is only allowed with the ex-
plicit written authorization of WTW GmbH, Weilheim.
Printed in Germany.

pH 720 Contents
3
1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.2 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.3 Sockets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1 Authorized use . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.2 General safety instructions. . . . . . . . . . . . . . . . 10
3 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . 13
3.2 Initial commissioning . . . . . . . . . . . . . . . . . . . . 13
4 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.1 Switch on the instrument . . . . . . . . . . . . . . . . . 15
4.2 Measuring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.2.1 Measuring the pH value . . . . . . . . . . . . 17
4.2.2 Measuring the Redox voltage . . . . . . . . 18
4.3 Calibrating . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.3.1 AutoCal TEC . . . . . . . . . . . . . . . . . . . . . 21
4.3.2 AutoCal DIN . . . . . . . . . . . . . . . . . . . . . 24
4.3.3 ConCal . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.4 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5 Maintenance, cleaning, disposal . . . . . . . . . . . 31
5.1 Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . 31
5.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
6 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . 33
7 Technical Data. . . . . . . . . . . . . . . . . . . . . . . . . . 37
8 Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Contents pH 720
4

pH 720 Overview
5
1 Overview
The compact inoLab pH 720 precision pH meter lets you
perform pH measurements rapidly and reliably.
The inoLab pH 720 provides the highest degree of operating
comfort, reliability and measuring safety for all applications.
The proven MultiCal®calibration procedures and special
AutoRead function support your work with the pH meter.
Note
The measuring instrument can also be delivered as part of
a set.
Information on this and other accessories is available in the
WTW catalog LABORATORY AND FIELD INSTRUMENTATION or
via the Internet.
1Keypad
2Display
3Sockets
pH
720
3
2
1