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Gebrauchsanleitung / Operating manual
Labor-pH-Meter
Laboratory pH Meter
CG 842
Bedienungsanleitung |
Seite 1 |
Operating manual |
Page 45 |
ba12242de_2 09/99
Operating Manual
Laboratory pH Meter
CG 842
ba12242e_2 |
09/99 |
45 |
Accuracy when All details contained in this operating manual are valid data going to press at the time of going to press. However, SCHOTT may add details for both technical and commercial reasons, or in or-
der to fulfil legal requirements of different countries. This does not affect the characteristics described.
Warranty The designated instrument is covered by a warranty of three declaration 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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1.1 |
Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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1.2 |
Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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1.3 |
Sockets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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1.4 |
Declaration of conformity . . . . . . . . . . . . . . . . . . . . . |
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1.5 |
Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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2 |
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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2.1 |
Authorized use . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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2.2 |
General safety instructions . . . . . . . . . . . . . . . . . . . |
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3 |
Commissioning . . . . . . . . . . . . . . . . . . . . . . . . |
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4 |
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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4.1 Switch on the instrument . . . . . . . . . . . . . . . . . . . . . 63 4.2 Measuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 4.2.1 Measuring the pH value . . . . . . . . . . . . . . . . 65
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
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List of contents
48
Overview
1 Overview
The compact CG 842 precision pH meter lets you perform pH measurements rapidly and reliably.
The CG 842 provides the highest degree of operating comfort, reliability and measuring safety for all applications.
The proven calibration procedures and special AutoRead function support your work with the pH meter.
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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.
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Overview
1.1Keyboard
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
Overview
1.2Display
Status line
Measured value display
Function and temperature display
1.3Sockets
1 |
2 |
3 |
4 |
1Socket according to DIN 19262/BNC
2Pt1000/NTC30 connector
for pH combined electrodes with temperature probe
3Reference electrode connector
4Connector 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
1.4Declaration 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
Overview
Ambient temperature
Measuring ranges and resolution
Measuring accuracy (± 1 digit)
1.5Technical data
Storage temperature |
- 25 °C ... + 65 °C |
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Operating temperature |
0 °C ... + 55 °C |
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Allowable relative hu- |
Annual mean: < 75 % |
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midity |
30 days/year: |
95 % |
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Other days: |
85 % |
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pH |
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- 2.000 ... + 16.000 |
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(resolution selectable) |
- 2.00 ... + 16.00 |
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U [mV] |
- 999.9 ... + 999.9 |
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- 1999 ... + 1999 |
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T [°C] |
- 5.0 ... + 100.0 |
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T [°F] |
+ 23.0 ... + 212.0 |
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Given as measuring uncertainty at a confidence level of 95%. All accuracies additionally depend on the accuracies of the measuring probes.
pH |
± 0.005 at + 15 °C ... + 35 °C |
(± 2 pH units around the |
± 0.01 |
calibration point) |
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U [mV] |
± 0.4 at + 15 °C ... + 35 °C |
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± 1 |
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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 |
Length [mm] |
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230 |
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Width [mm] |
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210 |
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Height [mm] |
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70 |
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Weight [kg] |
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Approx. 0.850 |
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Material |
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ABS |
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EMC and |
Interference emission |
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EN 50081-1 |
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VDE norms |
(generic standard) |
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FCC class A |
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Interference immunity |
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EN 50082-1 |
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(generic standard) |
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Protective class |
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3, EN61010-1 |
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Climatic class |
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2, VDI/VDE 3540 |
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Test marks |
TÜV GS, UL/CUL, CE |
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1 |
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Display |
Multifunctional LCD |
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Temperature com- |
Automatically with Pt |
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-5 ... 99.9 °C |
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pensation |
1000/NTC (30 kW) |
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Manual input |
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-20 ... 130 °C resolution 1K |
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Keypad |
Foil keypad (Polyester) |
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54
Overview
Energy supply |
Batteries |
4 x 1.5 V AA type alkaline manga- |
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nese batteries |
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Runtime |
Approx. 3000 operating hours |
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Mains power supply |
Connection max. overvoltage cate- |
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(option) |
gory II (valid for all plug-in power |
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supply units): |
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Plug-in power supply (Euro plug): |
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Type no.: Z851 |
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Order no.: 28 520 4897 |
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FRIWO FW3288, 11.8134 |
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Friwo Part No. 1816492 |
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Input: 230V ~ / 50 Hz / 23 VA |
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Output: 6 V = / 1,8 A /10,8 VA |
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Plug-in power supply (US plug): |
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Type no.: Z852 |
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Order no.: 28 520 4901 |
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FRIWO FW3288, 11.8451 |
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Friwo Part No. 1816493 |
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Input: 120V ~ / 60 Hz / 21,5 VA |
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Output: 6 V = / 1,8 A |
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Plug-in power supply (UK plug): |
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Type no.: Z849 |
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Order no.: 28 520 4975 |
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FRIWO FW3288, 11.8453 |
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Friwo Part No. 1770896 |
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Input: 230V ~ / 50 Hz / 23 VA |
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Output: 6 V = / 1,8 A |
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55
Overview
Connections
Input amplifier
Calibration modes
Electrodes |
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Socket according to DIN 19 262 |
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or BNC |
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4 mm socket for reference elec- |
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trode |
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Temperature probe |
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4 mm socket for |
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temperature probe |
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Plug-in power supply |
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2-pole special Friwo |
unit |
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Input impedance |
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³ 1012 W |
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Offset current |
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£ 10-12 A |
AutoCal TEC |
With Technical buffers |
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(given in pH): |
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2.00; 4.00; 7.00; 10.00 at 25 °C; |
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buffers are temperature com- |
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pensated in the range 0 ... 90 °C |
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AutoCal DIN |
With standard buffers according |
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to DIN 19 266/NIST (given in |
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pH): |
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1.68; 4.01; 6.87; 9.18 at 25 °C; |
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buffers are temperature com- |
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pensated in the range 0 ... 90 °C |
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ConCal |
With any buffers; |
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single-point and two-point cali- |
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bration, |
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manual acceptance of measured |
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values and temperature input |
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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 laboratory.
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.
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