Xylem CG 842 Manual de usuario

Labor-pH-MeterLaboratory pH MeterCG 842ba12242de_2 09/99Gebrauchsanleitung / Operating manualBedienungsanleitung Seite 1Operating manual Page 45

Overview531.5 Technical data Measuring accuracy(± 1 digit)Given as measuring uncertainty at a confidence level of 95%. All accuracies additionally de

Overview54 1 Keypad Foil keypad (Polyester)Length [mm] 230Width [mm] 210Height [mm] 70Weight [kg] Approx. 0.850Material ABSInterference emission (

Overview55Batteries 4 x 1.5 V AA type alkaline manga-nese batteriesRuntime Approx. 3000 operating hoursMains power supply (option)Connection max. over

Overview56Electrodes Socket according to DIN 19 262 or BNC4 mm socket for reference elec-trodeTemperature probe 4 mm socket fortemperature probePlug-i

Safety572 SafetyThis operating manual contains basic instructions that you must follow during the commissioning, operation and main-tenance of the pH

Safety582.1 Authorized useThis instrument is authorized exclusively for pH and Redox measurements in the laboratory. The technical specifications as g

Safety59Safe operation If safe operation is no longer possible, the instrument must be taken out of service and secured against inadvertent op-eration

Safety60

Commissioning613 CommissioningPerform the following activities for the initial commissioning:l Set the °C or °Fl Set the resolutionl Connect the plug-

Commissioning62Connecting theplug-in powersupply (optional)The measuring instrument works battery-powered. It can, however, also be supplied by the pl

Laboratory pH MeterCG 842ba12242e_2 09/99Operating Manual 45

Operation634Operation4.1 Switch on the instrumentNoteThe instrument has an energy saving feature to avoid un-necessary battery depletion. The energy s

Operation644.2 MeasuringPreparatoryactivitiesPerform the following activities when you want to measure:NoteIncorrect calibration of the pH electrode w

Operation654.2.1 Measuring the pH valueAutoRead AR(Drift control)The AutoRead function (drift control) checks the stability of the measurement signal.

Operation66NoteThe current AutoRead measurement (with acceptance of the current value) can be terminated at any time by pressing <run/enter>.4.2

Operation674.3 CalibratingWhy calibrate? pH electrodes age. This changes the asymmetry (zero point) and slope of the pH electrode. As a result, an ine

Operation68CalibrationevaluationAfter the calibration, the instrument automatically evaluates the current status. The asymmetry and slope are separate

Operation694.3.1 AutoCal TECUse any two of the Technical Buffer Solutions for this proce-dure.NoteSteps 2 and 6 are not required if you use a temperat

Operation706 If necessary, set the temperature of the second buffer solution by pressing <▲> <▼>.7 Submerse the electrode in the second bu

Operation714.3.2 AutoCal DINUse two different DIN buffer solutions for this procedure:NoteSteps 2 and 6 are not required if you use a temperature prob

Operation725 Thoroughly rinse the electrode with distilled water.6 If necessary, set the temperature of the second buffer solution by pressing <▲&g

Accuracy whengoing to pressAll details contained in this operating manual are valid data at the time of going to press. However, SCHOTT may add detail

Operation734.3.3 ConCalTwo-point calibrationUse two buffer solutions for this procedure:l pH 7.0 ± 0.5l any other buffer solutionNoteSteps 2 and 9 are

Operation748 Thoroughly rinse the electrode with distilled water.9 If necessary, set the temperature of the second buffer solution by pressing <▲&g

Operation75Single-point calibrationUse a buffer solution in the range pH = 7.0 ± 0.5 for this pro-cedure.NoteOnly the electrode asymmetry is determine

Operation764.4 ResetBasic settings The following functions are reset (initialized) to the values they had on delivery:Proceed as follows:Measuring mod

Maintenance, cleaning, disposal775 Maintenance, cleaning, disposal5.1 MaintenanceThe measuring instrument is almost maintenance-free. The only mainten

Maintenance, cleaning, disposal785.2 CleaningOccasionally wipe the outside of the measuring instrument with a damp, lint-free cloth. Disinfect the hou

What to do if...796 What to do if... Cause RemedypH electrode:– Not connected – Connect electrode– Air bubbles in front of the diaphragm– Remove

What to do if...80 Buffer solutions:– Incorrect buffer solutions – Change calibration procedure– Buffer solutions too old – Only use once.Note the

What to do if...81 Cause Remedy– pH electrode unsuitable – Use suitable electrode– Temperature difference between buffer and sample too large– Adjust

What to do if...82

List of contents471 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 491.1 Keyboard . . . . . . . . . . . . . . . . . . . . . . .

Lists837ListsThis chapter provides additional information and orientation aids.Abbreviations The list of abbreviations explains abbreviations that app

Lists84AbbreviationsAR AutoRead (drift control)ARng Automatic range switchingMeasuring instrument measures with high-est resolutionASY AsymmetryAutoCa

Lists85TP Temperature probeTemperature measurement activeUASY Asymmetry potential°C Temperature unit, °Celsius°F Temperature unit, Fahrenheit

Lists86GlossaryAsymmetry Zero point of a pH electrode.Resolution Number of decimal places that appear for a measured val-ue.AutoRead Monitors the elec

Lists 87IndexAasymmetry 67authorized use 58AutoCal DIN 67, 71AutoCal TEC 67, 69AutoRead 65Bbasic settings 76battery compartment 77Buchsenfeld 51Ccalib

List of contents48

Overview491OverviewThe compact CG 842 precision pH meter lets you perform pH measurements rapidly and reliably. The CG 842 provides the highest degree

Overview501.1 KeyboardSwitch measuring instrument ON/OFF<on/off>Select measuring mode<pH>Call up calibration procedure<CAL>Activate/

Overview511.2 Display1.3 Sockets CautionOnly connect probes to the instrument that cannot feed ex-cessive voltages or currents (> SELV and > cir

Overview521.4 Declaration of conformity29.03.99SCHOTT Geräte GmbHIm Langgewann 5D 65719 Hofheim am TaunusDeutschland, Germany, Allemagne29. März, Marc