Xylem CG 843P Manual do Utilizador

Laboratory pH MeterCG 843Pba12244e_2 09/99Operating Manual 73pH meter with integrated printer

Overview821.5 Technical data Storage temperature - 25 °C ... + 65 °C Operating temp. 0 °C ... + 55 °CAllowable relative humidityAnnual mean: <

Overview83 Keypad Foil keypad (Polyester)Data storage Ring store for 200 value pairs, pH/mV, temperatureLength [mm] 230Width [mm] 210Height [mm] 7

Overview84 Batteries 4 x 1.5 V AA type alkaline manganese batteriesRuntime Approx. 3000 operating hoursMains power supply (option)Plug-in power suppl

Overview85Electrodes Socket acc. to DIN 19 262 or BNC4-mm socket for reference electodeTemp. probe 4-mm socket for temperature probeInterface/analog o

Overview86

Safety872 SafetyThis operating manual contains basic instructions that you must follow during the commissioning, operation and main-tenance of the pH

Safety882.1 Authorized useThis instrument is authorized exclusively for pH and Redox measurements in the laboratory. The technical specifications as g

Safety89Safe operation If safe operation is no longer possible, the instrument must be taken out of service and secured against inadvertent op-eration

Safety90

Commissioning913 CommissioningPerform the following activities for the initial commissioning:l Set the date and timel Connect the plug-in power supply

74Accuracy whengoing to pressAll details contained in this operating manual are valid data at the time of going to press. However, SCHOTT may add det

Commissioning92Connecting theplug-in powersupplyThe plug-in power supply supplies the pH meter with low voltage (7.5 V ... 12 V DC).WarningThe line vo

Operation934Operation4.1 Switch on the instrumentNoteThe instrument has an energy saving feature to avoid unnecessary battery depletion. The energy sa

Operation944.2 MeasuringPreparatoryactivitiesPerform the following preparatory activities when you want to measure:NoteIncorrect calibration of the pH

Operation95Temperature probe Measurements can be performed with and without a temper-ature probe. A connected temperature probe is indicated by TP on

Operation964.2.1 Measuring the pH valueAutoRead AR(Drift control)The AutoRead function (drift control) checks the stability of the measurement signal.

Operation97NoteThe current AutoRead measurement (with acceptance of the current value) can be terminated at any time by pressing <run/enter>.4.2

Operation984.2.3 Printing/transmitting measured values Measured values (data records) can be:l printed on the integrated printer orl transmitted to th

Operation994.3 CalibratingWhy calibrate? pH electrodes age. This changes the asymmetry (zero point) and slope of the pH electrode. As a result, an ine

Operation100AutoRead In calibration using AutoCal TEC and AutoCal DIN, the AutoRead function is automatically activated. The current AutoRead measurem

Operation101CalibrationevaluationAfter the calibration, the instrument automatically evaluates the current status. The asymmetry and slope are separat

List of contents751 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 771.1 Keypad . . . . . . . . . . . . . . . . . . . . . . .

Operation1024.3.1 Calibration interval (Int 3)The flashing sensor symbol reminds you to calibrate regu-larly. After the selected calibration interval

Operation1034.3.2 AutoCal TECUse any two or three of the Technical buffer solutions for this procedure in increasing or decreasing order.NoteSteps 2,

Operation1045 Thoroughly rinse the electrode with distilled water.6 If necessary, set the temperature of the second buffer solution by pressing <▲&

Operation105NoteYou can also prematurely terminate the three-point calibra-tion by pressing <pH>. The values of the two-point calibra-tion for t

Operation1064.3.3 AutoCal DINUse two or three different DIN buffer solutions for this proce-dure in increasing or decreasing order:NoteSteps 2, 6 and

Operation1075 Thoroughly rinse the electrode with distilled water.6 If necessary, set the temperature of the second buffer solution by pressing <▲&

Operation108NoteYou can also prematurely terminate the three-point calibra-tion by pressing <pH>. The values of the two-point calibra-tion for s

Operation1094.3.4 ConCalTwo-point calibrationUse two buffer solutions for this procedure:l pH 7.0 ± 0.5l any other buffer solutionNoteSteps 2 and 9 ar

Operation1108 Thoroughly rinse the electrode with distilled water.9 If necessary, set the temperature of the second buffer solution by pressing <▲&

Operation111Single-point calibrationUse a buffer solution in the range pH = 7.0 ± 0.5 for this pro-cedure.NoteOnly the electrode asymmetry is determin

List of contents765 Maintenance, cleaning, disposal . . . . . . . . . 1315.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . .1315.1.1

Operation1124.4 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

Operation113 *(+,, message This message appears if all 200 memory locations are full.You have the following options:2 Confirm with <run/enter>

Operation1144.4.2 Switching on AutoStore (Int 1) The storage interval (Int 1) determines the time interval between automatic storage processes. After

Operation115NoteThe AutoStore function is interrupted if you perform other functions, e.g. output data storage. After completing the other function, t

Operation1164.4.3 Outputting the data storageThe contents of the data storage can be output to the:l displayl printerl RS interfaceYou can perform the

Operation117NoteIf you want to find a specific parameter (e.g. date), proceed as follows:NoteYou can the cancel the transmission by pressing <pH>

Operation118Sample printout:The printout contains:l calibration protocoll storage contentsCALIBRATION PROTOCOL 02.03.99 14:19Device No.: 12345678C

Operation1194.4.4 Clearing the storage This function can erase the stored data records. 200 mem-ory locations will then become available again. NoteTh

Operation1204.5 Data transmissionYou can use the following options to transmit data:l One of the following options:– The AutoStore function (page 114)

Operation121Setting thedata transmissionintervalThe interval is set to OFF in the factory. To start the data transmission, set up an interval (5 s, 10

Overview771OverviewThe compact CG 843 P precision pH meter lets you perform pH measurements rapidly and reliably. The CG 843 P pro-vides the highest d

Operation1224.5.2 Recorder (analog output)You can transmit the data to a recorder via the analog out-put. Connect the analog output to the recorder vi

Operation1234.5.3 PC/external printer (RS232 interface)You can transmit data to a PC or an external printer via the RS232 interface. Connect the RS in

Operation1244.6 ConfigurationYou can adapt the pH meter to your individual requirements. To do this, the following parameters can be changed (the stat

Operation125 4 Set up the required baud rate by pressing <▲> <▼>.5 Confirm with <run/enter>.Int 2 appears on the display.6 Set up

Operation12610 Change between °C and °F by pressing <▲> <▼>.11 Confirm with <run/enter>.The date flashes on the display.Temperature

Operation127 20 Set the current time by pressing <▲> <▼>.21 Confirm with <run/enter>.The instrument changes automatically to the pH

Operation1284.7 ResetYou can reset (initialize) measuring and configuration parameters separately from one another.Measuring parame-tersThe following

Operation129 1 Press and hold down the <run/enter> key.2 Press the <CAL> key.3 Use <▲> <▼> to toggle between no and yes.yes: r

Operation130

Maintenance, cleaning, disposal1315 Maintenance, cleaning, disposal5.1 MaintenanceThe maintenance tasks are restricted to the following activ-ities:l

Overview781.1 KeypadSwitch measuring instrument on or off<on/off>Select measuring mode<pH>Call up calibration procedure<CAL>Activate

Maintenance, cleaning, disposal1325.1.1 Changing the batteriesCautionMake sure that the poles of the batteries are the right way round.The ± signs in

Maintenance, cleaning, disposal1335.1.2 Replacing the roll of printer paperNoteOnly use original SCHOTT rolls of printer paper. Information on this is

Maintenance, cleaning, disposal1345.2 CleaningOccasionally wipe the outside of the measuring instrument with a damp, lint-free cloth. Disinfect the ho

What to do if...1356 What to do if... Cause RemedypH electrode:– Not connected – Connect electrode– Air bubbles in front of the diaphragm– Remove

What to do if...136 Buffer solutions:– Incorrect buffer solutions – Change calibration procedure– Buffer solutions too old – Only use once.Note the

What to do if...137 Cause Remedy– Batteries almost depleted– Replace batteries(see section 5.1.1 CHANGING THE BATTERIES)Cause Remedy– Timeout of th

What to do if...138 –AutoStore function is switched on with a longer interval duration (Int 1)– Switch off AutoStore functionCause Remedy– AutoStor

Lists1397ListsThis chapter provides additional information and orientation aids.Abbreviations The list of abbreviations explains abbreviations that ap

Lists140AbbreviationsAR AutoRead (drift control)ARng Automatic range switchingMeasuring instrument measures with high-est resolutionASY AsymmetryAutoC

Lists141RCL Recallmemory dumpS SlopeSELV Safety Extra Low VoltageSEr Serial interfaceOutput of the data storage on the RS 232 or on the internal print

Overview79Print LED Red: printer off (offline) or malfunctionGreen: printer ready for operation (online)Printer ON/OFF<print on/off>Paper feed/l

Lists142GlossaryAsymmetry Zero point of a pH electrode.Resolution Number of decimal places that appear for a measured value.AutoRead Monitors the elec

Lists 143IndexAanalog output 122asymmetry 99authorized use 88AutoCal DIN 99, 106AutoCal TEC 99, 103AutoRead 96Bbatteriesreplacing 131battery compartme

Lists 144Ssafety 87safety precautions 87single-point calibration 99ConCal 111slope 99sockets 80Ttemperature probe 95three-point calibration 99AutoCal

Overview801.2 Display1.3 SocketsCautionOnly connect probes to the instrument that cannot feed ex-cessive voltages or currents (> SELV and > circ

Overview811.4 Declaration of conformity29.03.99SCHOTT Geräte GmbHIm Langgewann 5D 65719 Hofheim am TaunusDeutschland, Germany, Allemagne29. März, Marc