wtw inoLab pH/Oxi Level 1 User manual

inoLab
pH/Cond Level 1
ba12234e03 10/2002 71
Operating manual
Measuring Instrument
for pH, Redox,
and Conductivity

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 declara-
tion
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 2002, WTW GmbH & Co. KG
Reprinting - even as excerpts - is only allowed with the ex-
plicit written authorization of WTW GmbH & Co. KG,
Weilheim.
Printed in Germany.

List of contents
73
1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
1.1 Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .76
1.2 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77
1.3 Sockets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77
1.4 Operating structure . . . . . . . . . . . . . . . . . . . . . .78
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
2.1 Authorized use . . . . . . . . . . . . . . . . . . . . . . . . .80
2.2 General safety instructions . . . . . . . . . . . . . . . .80
3 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . 83
4 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
4.1 Switch on the instrument . . . . . . . . . . . . . . . . . .85
4.2 Measuring the pH value/Redox voltage . . . . . .86
4.2.1 Measuring the pH value . . . . . . . . . . . . .88
4.2.2 Measuring the Redox voltage . . . . . . . . .89
4.3 Calibrating for pH measurements . . . . . . . . . . .90
4.3.1 AutoCal TEC . . . . . . . . . . . . . . . . . . . . .92
4.3.2 AutoCal DIN . . . . . . . . . . . . . . . . . . . . . .94
4.3.3 ConCal . . . . . . . . . . . . . . . . . . . . . . . . . .96
4.4 Measuring the conductivity . . . . . . . . . . . . . . . .99
4.4.1 Conductivity / Specific resistance . . . . .101
4.4.2 Salinity . . . . . . . . . . . . . . . . . . . . . . . . .102
4.4.3 TDS (total dissolved solids) . . . . . . . . .103
4.4.4 AutoRead AR (Drift control) . . . . . . . . .104
4.5 Determining/setting up the cell constant [C] . .105
4.5.1 Determining the cell constant
(calibration in control standard) . . . . . .105
4.5.2 Setting up the cell constant . . . . . . . . .108
4.6 Setting up the temperature compensation TC .111
4.7 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . .115
4.8 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .118
5 Maintenance, cleaning, disposal . . . . . . . . . 121
5.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . .121

List of contents
74
5.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . .122
5.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .122
6 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . 123
6.1 pH system messages . . . . . . . . . . . . . . . . . . .123
6.2 Conductivity system messages . . . . . . . . . . . .125
6.3 General errors . . . . . . . . . . . . . . . . . . . . . . . . .126
7 Technical Data . . . . . . . . . . . . . . . . . . . . . . . . 127
7.1 General data . . . . . . . . . . . . . . . . . . . . . . . . . .127
7.2 pH/Redox measurement . . . . . . . . . . . . . . . . .128
7.3 Conductivity measurement . . . . . . . . . . . . . . .129
8 Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
9 Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141

Overview
75
1Overview
The compact inoLab pH/Cond Level 1 precision measuring
instrument lets you perform pH, Redox, and conductivity
measurements rapidly and reliably. The inoLab pH/Cond
Level 1 provides the highest degree of operating comfort, re-
liability and measuring safety for all applications.
The proven MultiCal®calibration procedures and special
AutoRead function support your work with the instrument.
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
3
2
1

Overview
76
1.1 Keypad
1Measuring instrument ON/OFF
2Select measuring mode
3Call up calibration procedure
4Activate/deactivate AutoRead
5Confirm inputs, start AutoRead
6Select measuring mode, increase values,
scroll
7Select measuring mode, reduce values,
scroll
4
3
2
1
7
6
5

Overview
77
1.2 Display
1.3 Sockets
Caution
Only connect probes to the instrument that cannot feed ex-
cessive voltages or currents (> SELV and > circuit with cur-
rent limiter). Almost all commercial probes - especially WTW
probes - meet these requirements.
Connectors:
1Conductivity measuring cell
2pH/Redox electrode
3Temperature probe
4Reference electrode
5Mains power supply (option)
S
tatus
li
ne
Measured value display
Function and
temperature display
Sensor symbol
1
4
5

Overview
78
1.4 Operating structure
The following overview diagram shows which keys you have
to press to select between the different measuring modes:
Note
The conductivity, salinity and TDS measuring modes only
appear if a conductivity measuring cell with temperature pro-
be is connected to the instrument.
Note
When a conductivity measuring cell with temperature probe
is connected, the measuring instrument recognizes the
measuring cell and automatically switches to the previously
selected conductivity measuring mode. As soon as the mea-
suring cell is disconnected, the instrument switches to the
pH or Redox measuring mode.

Safety
79
2 Safety
This operating manual contains basic instructions that you
must follow during the commissioning, operation and main-
tenance of the instrument. Consequently, all responsible
personnel must read this operating manual before working
with the instrument.
The operating manual must always be available within the
vicinity of the instrument.
Target group This measuring instrument was developed for use in the lab-
oratory.
Thus, we assume that, as a result of their professional train-
ing and experience, the operators will know the necessary
safety precautions to take when handling chemicals.
Symbols used
Caution
indicates instructions that have to be followed to prevent
damage to your instrument.
Warning
indicates instructions that have to be followed to protect
yourself and the instrument from dangerous electrical volt-
age.
Note
Indicates notes that draw your attention to special features.
Note
Indicates cross-references to other documents, e.g. appli-
cation reports, operating manuals of combination elec-
trodes, etc.

Safety
80
2.1 Authorized use
This instrument is authorized exclusively for measuring the
pH, Redox, and conductivity in the laboratory.
The technical specifications as given in the chapter 7 TECH-
NICAL DATA, must be observed. Only the operation and run-
ning of the measuring instrument according to the
instructions given in this operating manual is authorized.
Any other use is considered unauthorized.
2.2 General safety instructions
This instrument is constructed and tested in compliance with
the EN 61010-1 safety regulations for electronic measuring
instruments.
It left the factory in a safe and secure technical condition.
Function and opera-
tional safety
The smooth functioning and operational safety of the instru-
ment can only be guaranteed if the generally applicable
safety measures and the specific safety instructions in this
operating manual are followed.
The smooth functioning and operational safety of the instru-
ment can only be guaranteed under the climatic conditions
specified in chapter 7 TECHNICAL DATA.
If the instrument was transported from a cold environment to
a warm environment, the formation of condensate can lead
to the faulty functioning of the instrument. In this event, wait
until the temperature of the instrument reaches room tem-
perature before putting the instrument back into operation.
Caution
The instrument is only allowed to be opened by personnel
authorized by WTW.