Xylem CG 842 User Manual
Gebrauchsanleitung / Operating manual
Labor-pH-Meter
Laboratory pH Meter
CG 842
ba12242de_2 09/99
Bedienungsanleitung Seite 1
Operating manual Page 45
Laboratory pH Meter
CG 842
Operating Manual
ba12242e_2 09/99
45
Accuracy when
going to press
All details contained in this operating manual are valid data
at the time of going to press. However, SCHOTT may add
details for both technical and commercial reasons, or in order to fulfil legal requirements of different countries. This
does not affect the characteristics described.
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
© Hofheim SCHOTT Geräte GmbH 1999
Reprinting - even as excerpts - is only allowed with the
explicit written authorization of SCHOTT Geräte GmbH,
Hofheim.
Printed in Germany.
List of contents
1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
1.1 Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
1.2 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
1.3 Sockets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
1.4 Declaration of conformity . . . . . . . . . . . . . . . . . . . . .52
1.5 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
2.1 Authorized use . . . . . . . . . . . . . . . . . . . . . . . . . . . .58
2.2 General safety instructions . . . . . . . . . . . . . . . . . . .58
3 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . 61
4 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
4.1 Switch on the instrument . . . . . . . . . . . . . . . . . . . . .63
4.2 Measuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
4.2.1 Measuring the pH value . . . . . . . . . . . . . . . .6 5
4.2.2 Measuring the Redox voltage . . . . . . . . . . .66
4.3 Calibrating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
4.3.1 AutoCal TEC . . . . . . . . . . . . . . . . . . . . . . . . 69
4.3.2 AutoCal DIN . . . . . . . . . . . . . . . . . . . . . . . . .71
4.3.3 ConCal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
4.4 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .76
5 Maintenance, cleaning, disposal . . . . . . . . . . 77
5.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77
5.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .78
5.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
6 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . 79
7 Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
47
List of contents
48
1Overview
Overview
The compact
pH measurements rapidly and reliably.
The
CG 842
fort, reliability and measuring safety for all applications.
The proven calibration procedures and special
function support your work with the pH meter.
CG 842
provides the highest degree of operating com-
precision pH meter lets you perform
AutoRead
3
2
1 Keypad
2 Display
3 Sockets
1
Note
The measuring instrument can also be delivered as part of
a set.
Information on this and other accessories is available in the
SCHOTT general catalog.
49
Overview
1.1 Keyboard
Switch measuring instrument ON/OFF
<on/off>
Select measuring mode
<pH>
Call up calibration procedure
<CAL>
Activate/deactivate AutoRead
<auto read>
Reduce values, scroll
t>
<
Confirm inputs, start AutoRead
<run/enter>
Increase values, scroll
s>
<
50
1.2 Display
1.3 Sockets
Overview
Status line
Measured value display
Function and
temperature displ a y
1 2 3 4
1 Socket according to DIN 19262/BNC
2 Pt1000/NTC30 connector
for pH combined electrodes with
temperature probe
3 Reference electrode connector
4 Connector for
plug-in power supply (optional)
Caution
Only connect probes to the instrument that cannot feed excessive voltages or currents (> SELV and > circuit with current limiter).
Almost all commercial electrodes - especially SCHOTT
electrodes - meet these requirements.
51
Overview
1.4 Declaration of conformity
29.03.99
SCHOTT Geräte GmbH
Im Langgewann 5
D 65719 Hofheim am Taunus
Deutschland, Germany, Allemagne
29. März, March 29rd, 29, Mars, 1999
AGQSF0000-A056-00/990329
52
Ambient
temperature
Overview
1.5 Technical data
Storage temperature - 25 °C ... + 65 °C
Operating temperature 0 °C ... + 55 °C
Measuring ranges
and resolution
Measuring accuracy
(± 1 digit)
Allowable relative humidity
Annual mean: < 75 %
30 days/year: 95 %
Other days: 85 %
pH
(resolution selectable)
- 2.000 ... + 16.000
- 2.00 ... + 16.00
U [mV] - 999.9 ... + 999.9
- 1999 ... + 1999
T [°C] - 5.0 ... + 100.0
T [°F] + 23.0 ... + 212.0
Given as measuring uncertainty at a confidence level of
95%. All accuracies additionally depend on the accuracies
of the measuring probes.
pH
(± 2 pH units around the
± 0.005 at + 15 °C ... + 35 °C
± 0.01
calibration point)
U [mV] ± 0.4 at + 15 °C ... + 35 °C
± 1
T [°C] NTC 30: ± 0.1
PT 1000:
± 0.5 at 0 °C ... 15 °C
± 0.1 at 15 °C ... 35 °C
± 1 at 35 °C ... 55 °C
T [°F] NTC 30: ± 0.2
PT 1000:
± 0.9 at 32 °F ... 59 °F
± 0.2 at 59 °F ... 95 °F
± 1.8 at 95 °F ... 131 °F
53
Overview
Housing
EMC and
VDE norms
Length [mm] 230
Width [mm] 210
Height [mm] 70
Weight [kg] Approx. 0.850
Material ABS
Interference emission
(generic standard)
EN 50081-1
FCC class A
Test marks
Display
Temperature com-
pensation
Keypad Foil keypad (Polyester)
Interference immunity
EN 50082-1
(generic standard)
Protective class 3, EN61010-1
Climatic class 2, VDI/VDE 3540
TÜV GS, UL/CUL, CE
1
Multifunctional LCD
Automatically with Pt
1000/NTC (30 k
W)
-5 ... 99.9 °C
Manual input -20 ... 130 °C resolution 1K
54
Overview
Energy supply
Batteries 4 x 1.5 V AA type alkaline manga-
nese batteries
Runtime Approx. 3000 operating hours
Mains power supply
(option)
Connection max. overvoltage cate-
gory II (valid for all plug-in power
supply units):
Plug-in power supply (Euro plug):
Type no.: Z851
Order no.: 28 520 4897
FRIWO FW3288, 11.8134
Friwo Part No. 1816492
Input: 230V ~ / 50 Hz / 23 VA
Output: 6 V = / 1,8 A /10,8 VA
Plug-in power supply (US plug):
Type no.: Z852
Order no.: 28 520 4901
FRIWO FW3288, 11.8451
Friwo Part No. 1816493
Input: 120V ~ / 60 Hz / 21,5 VA
Output: 6 V = / 1,8 A
Plug-in power supply (UK plug):
Type no.: Z849
Order no.: 28 520 4975
FRIWO FW3288, 11.8453
Friwo Part No. 1770896
Input: 230V ~ / 50 Hz / 23 VA
Output: 6 V = / 1,8 A
55
Overview
Connections
Input amplifier
Calibration modes
Electrodes Socket according to DIN 19 262
or BNC
4 mm socket for reference elec-
trode
Temperature probe 4 mm socket for
temperature probe
Plug-in power supply
2-pole special Friwo
unit
12
10
-12
Ω
A
Input impedance ≥ 10
Offset current ≤
AutoCal TEC With Technical buffers
(given in pH):
2.00; 4.00; 7.00; 10.00 at 25 °C;
buffers are temperature com-
pensated in the range 0 ... 90 °C
AutoCal DIN With standard buffers according
to DIN 19 266/NIST (given in
pH):
1.68; 4.01; 6.87; 9.18 at 25 °C;
buffers are temperature com-
pensated in the range 0 ... 90 °C
ConCal With any buffers;
single-point and two-point cali-
bration,
manual acceptance of measured
values and temperature input
56
Safety
2 Safety
This operating manual contains basic instructions that you
must follow during the commissioning, operation and maintenance of the pH meter. 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 training 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 voltage.
Note
Indicates notes that draw your attention to special features.
Note
Indicates cross-references to other documents, e.g. application reports, operating manuals of combination electrodes, etc.
57
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