Xylem CG 843 Manual de usuario

Laboratory pH MeterCG 843ba12243e_2 09/99Operating Manual 69

Overview78 Keypad Foil keypad (Polyester)Length [mm] 230Width [mm] 210Height [mm] 70Weight [kg] Approx. 1.3 (without plug-in power supply unit)Mat

Overview79 Data storage Ring store for 200 value pairs, pH/mV, temperatureBatteries 4 x 1.5 V AA type alkaline manganese batteriesRuntime Approx. 300

Overview80Electrodes Socket acc. to DIN 19 262 or BNC4-mm socket for reference electodeTemp. probe 4-mm socket for temperature probeInterface/analog o

Safety812 SafetyThis operating manual contains basic instructions that you must follow during the commissioning, operation and main-tenance of the pH

Safety822.1 Authorized useThis instrument is authorized exclusively for pH and Redox measurements in the laboratory. The technical specifications as g

Safety83Safe operation If safe operation is no longer possible, the instrument must be taken out of service and secured against inadvertent op-eration

Safety84

Commissioning853 CommissioningPerform the following activities for the initial commissioning:l Set the date and timel Connect the plug-in power supply

Commissioning86Connecting theplug-in powersupply (optional)The measuring instrument works battery-powered. It can, however, also be supplied by the pl

Operation874Operation4.1 Switch on the instrumentNoteThe instrument has an energy saving feature to avoid unnecessary battery depletion. The energy sa

70Accuracy whengoing to pressAll details contained in this operating manual are valid data at the time of going to press. However, SCHOTT may add det

Operation884.2 MeasuringPreparatoryactivitiesPerform the following preparatory activities when you want to measure:NoteIncorrect calibration of the pH

Operation89Temperature probe Measurements can be performed with and without a temper-ature probe. A connected temperature probe is indicated by TP on

Operation904.2.1 Measuring the pH valueAutoRead AR(Drift control)The AutoRead function (drift control) checks the stability of the measurement signal.

Operation91NoteThe current AutoRead measurement (with acceptance of the current value) can be terminated at any time by pressing <run/enter>.4.2

Operation924.2.3 Transmitting measured values You can transmit measured values (data records) in 3 ways:l Switch on the data transmission (Int 2) (see

Operation934.3 CalibratingWhy calibrate? pH electrodes age. This changes the asymmetry (zero point) and slope of the pH electrode. As a result, an ine

Operation94Calibration protocol The calibration protocol contains the calibration data of the current calibration. You can call up the calibration pro

Operation95CalibrationevaluationAfter the calibration, the instrument automatically evaluates the current status. The asymmetry and slope are separate

Operation964.3.1 Calibration interval (Int 3)The flashing sensor symbol reminds you to calibrate regu-larly. After the selected calibration interval (

Operation974.3.2 AutoCal TECUse any two or three of the Technical buffer solutions for this procedure in increasing or decreasing order.NoteSteps 2, 6

List of contents711 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 731.1 Keypad . . . . . . . . . . . . . . . . . . . . . . .

Operation986 If necessary, set the temperature of the second buffer solution by pressing <▲> <▼>.7 Submerse the electrode in the second bu

Operation99NoteYou can also prematurely terminate the three-point calibra-tion by pressing <pH>. The values of the two-point calibra-tion for th

Operation1004.3.3 AutoCal DINUse two or three different DIN buffer solutions for this proce-dure in increasing or decreasing order.NoteSteps 2, 6 and

Operation1015 Thoroughly rinse the electrode with distilled water.6 If necessary, set the temperature of the second buffer solution by pressing <▲&

Operation102NoteYou can also prematurely terminate the three-point calibra-tion by pressing <pH>. The values of the two-point calibra-tion for s

Operation1034.3.4 ConCalTwo-point calibrationUse two buffer solutions for this procedure:l pH 7.0 ± 0.5l any other buffer solutionNoteSteps 2 and 9 ar

Operation1048 Thoroughly rinse the electrode with distilled water.9 If necessary, set the temperature of the second buffer solution by pressing <▲&

Operation105Single-point calibrationUse a buffer solution in the range pH = 7.0 ± 0.5 for this pro-cedure.NoteOnly the electrode asymmetry is determin

Operation1064.4 StoringThe pH meter has an internal data storage device. Up to 200 data records can be stored in it. A complete data record consists o

Operation107 *(+,, message This message appears if all 200 memory locations are full.You have the following options:2 Confirm with <run/enter>

List of contents725 Maintenance, cleaning, disposal . . . . . . . . . 1255.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . .1255.2 C

Operation1084.4.2 Switching on AutoStore (Int 1) The storage interval (Int 1) determines the time interval between automatic storage processes. After

Operation109NoteThe AutoStore function is interrupted if you perform other functions, e.g. output data storage. After completing the other function, t

Operation1104.4.3 Outputting the data storageThe contents of the data storage can be output to the:l displayl RS interfaceYou can perform the followin

Operation111NoteYou can the cancel the transmission by pressing <pH> or <run/enter>.1 Select the parameter (e.g. date) by pressing <run

Operation112Sample printout:The printout contains:l calibration protocoll storage contentsCALIBRATION PROTOCOL 02.03.99 14:19Device No.: 12345678C

Operation1134.4.4 Clearing the storage This function can erase the stored data records. 200 mem-ory locations will then become available again. NoteTh

Operation1144.5 Data transmissionYou can use the following options to transmit data:l One of the following options:– The AutoStore function (108) is u

Operation115Setting thedata transmissionintervalThe interval is set to OFF in the factory. To start the data transmission, set up an interval (5 s, 10

Operation1164.5.2 Recorder (analog output)You can transmit the data to a recorder via the analog out-put. Connect the analog output to the recorder vi

Operation1174.5.3 PC/external printer (RS232 interface)You can transmit data to a PC or an external printer via the RS232 interface. Connect the RS in

Overview731OverviewThe compact CG 843 precision pH meter lets you perform pH measurements rapidly and reliably. The CG 843 pro-vides the highest degre

Operation1184.6 ConfigurationYou can adapt the pH meter to your individual requirements. To do this, the following parameters can be changed (the stat

Operation119 4 Set up the required baud rate by pressing <▲> <▼>.5 Confirm with <run/enter>.Int 2 appears on the display.6 Set up

Operation120 8 Set up the required time interval by pressing <▲><▼>.9 Confirm with <run/enter>.USE °C appears on the display.10 Chan

Operation121 16 Set the current year by pressing <▲> <▼>.17 Confirm with <run/enter>.The hours flash on the display.18 Set the curr

Operation1224.7 ResetYou can reset (initialize) measuring and configuration parameters separately from one another.Measuring parame-tersThe following

Operation123 1 Press and hold down the <run/enter> key.2 Press the <CAL> key.3 Use <▲> <▼> to toggle between no and yes.yes: r

Operation124

Maintenance, cleaning, disposal1255 Maintenance, cleaning, disposal5.1 MaintenanceThe measuring instrument is almost maintenance-free. The only mainte

Maintenance, cleaning, disposal1265.2 CleaningOccasionally wipe the outside of the measuring instrument with a damp, lint-free cloth. Disinfect the ho

What to do if...1276 What to do if... Cause RemedypH electrode:– Not connected – Connect electrode– Air bubbles in front of the diaphragm– Remove

Overview741.1 KeypadSwitch measuring instrument on or off<on/off>Select measuring mode<pH>Call up calibration procedure<CAL>Activate

What to do if...128 Buffer solutions:– Incorrect buffer solutions – Change calibration procedure– Buffer solutions too old – Only use once.Note the

What to do if...129 Cause Remedy– Batteries almost depleted– Replace batteries(see section 5.1 MAINTENANCE)Cause Remedy– Timeout of the interface –

What to do if...130

Lists1317ListsThis chapter provides additional information and orientation aids.Abbreviations The list of abbreviations explains abbreviations that ap

Lists132AbbreviationsAR AutoRead (drift control)ARng Automatic range switchingMeasuring instrument measures with high-est resolutionASY AsymmetryAutoC

Lists133RCL Recallmemory dumpS SlopeSELV Safety Extra Low VoltageSEr Serial interfaceOutput of the data storage on the RS 232 or on the internal print

Lists134GlossaryAsymmetry Zero point of a pH electrode.Resolution Number of decimal places that appear for a measured value.AutoRead Monitors the elec

Lists 135IndexAanalog output 116asymmetry 93authorized use 82AutoCal DIN 93, 100AutoCal TEC 93, 97AutoRead 90Bbattery compartment 125baud ratesetting

Lists 136sockets 75Ttemperature probe 89three-point calibration 93AutoCal DIN 102AutoCal TEC 99timesetting 85, 120two-point calibration 93AutoCal DIN

Overview751.2 Display1.3 SocketsCautionOnly connect probes to the instrument that cannot feed ex-cessive voltages or currents (> SELV and > circ

Overview761.4 Declaration of conformity29.03.99SCHOTT Geräte GmbHIm Langgewann 5D 65719 Hofheim am TaunusDeutschland, Germany, Allemagne29. März, Marc

Overview771.5 Technical data Storage temperature - 25 °C ... + 65 °C Operating temp. 0 °C ... + 55 °CAllowable relative humidityAnnual mean: <