Xylem CG 853 User Manual

Conductivity meter

CG 853

Operating Manual

ba12245e_2 09/99

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.

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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

1.1 Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80

1.2 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .81

1.3 Sockets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .81

1.4 Declaration of Conformity . . . . . . . . . . . . . . . . . . .82

1.5 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . .83

2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

2.1 Authorized use . . . . . . . . . . . . . . . . . . . . . . . . . . .90

2.2 General safety instructions . . . . . . . . . . . . . . . . . .90

3 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . 93

4 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

4.1 Switch on the instrument . . . . . . . . . . . . . . . . . . . .95

4.2 Measuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .97

4.2.1 Conductivity . . . . . . . . . . . . . . . . . . . . . . . .99

4.2.2 Salinity . . . . . . . . . . . . . . . . . . . . . . . . . . .100

4.2.3 TDS (total dissolved solids) . . . . . . . . . . .101

4.2.4 Transmitting measured values . . . . . . . .102

4.3 Determining/setting up the cell constant [C] . . . .103

4.4 Storing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .114

4.4.1 Manual storage . . . . . . . . . . . . . . . . . . . . .114

4.4.2 Switching on AutoStore (Int 1) . . . . . . . . .116

4.4.3 Outputting the data storage . . . . . . . . . . .118

4.4.4 Clearing the storage . . . . . . . . . . . . . . . . .124

4.5 Data transmission . . . . . . . . . . . . . . . . . . . . . . . .125

4.5.1 Data transmission interval (Int 2) . . . . . . .125

4.5.2 Recorder (analog output) . . . . . . . . . . . . .127

4.5.3 PC/external printer (RS232 interface) . . .128

4.6 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . .129

4.7 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .134

List of contents

5 Maintenance, cleaning, disposal . . . . . . . . . . . 137

5.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . .137

5.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .138

5.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .138

6 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . 139

7 Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141

1Overview

Overview

The compact perform conductivity measurements rapidly and reliably. The

CG 853

fort, reliability and measuring safety for all applications. The proven procedures to determine or set up the cell con-

stant support your work with the conductivity meter.

CG 853

provides the highest degree of operating com-

precision conductivity meter lets you

1 Keypad 2 Display 3 Sockets

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.

Overview

1.1 Keyboard

Measuring instrument ON/OFF

Select measuring mode

ì>

Set up or determine cell constant; select temperature compensation <CAL>

Activate/deactivate AutoRead function

Store measured value

<STO>

Display/transmit measured values

<RCL>

Reduce values, scroll

▼>

Confirm inputs, start AutoRead

Increase values, scroll

▲>

1.2 Display

1.3 Sockets

Overview

Status line

Measured value display

Function and temperature displ a y

Connections:

1 8 pole socket with pin contacts 2 RS 232 interface/analog output 3 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.

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-A059-00/990329

Ambient

temperature

1.5 Technical data

Storage temperature

- 25 °C ... + 65 °C

Overview

Measuring ranges

and resolution

Operating temperature

Allowable relative humidity

[µS/cm]

[mS/cm]

0 °C ... + 55 °C

Annual mean: < 75 % 30 days/year: 95 % Other days: 85 %

0.000 ... 1.999

-1

(only with 0.01 cm

cell constant )

0.00 ... 19.99 (only with 0.01 cm

-1

0.1 cm

cell constant )

-1

constant and

0.0 ... 199.9 0 ... 1999

0.00 ... 19.99

0.0 ... 199.9 0 ... 500

SAL 0.0 ... 70.0 according to the IOT

table

TDS [mg/l] 0 ... 1999

Factor can be set in the range

0.40 ... 1.00 T [°C] − 5.0 ... + 100.0 T [°F] + 23.0 ... + 212.0

Overview

Measuring accuracy

(± 1 digit)

Given as measuring uncertainty at a confidence level of 95%. All accuracies additionally depend on the accuracies of the measuring probes.

No compensation:

Accuracy ± 0.5 %

Non-linear compensation : Accuracy Test sample temperature ± 0.5 % 0 °C ... 35 °C according to EN 27 888; ± 0.5 % 35 °C ... 50 °C extended nLF function according to SCHOTT measurements

Linear compensation : Accuracy Test sample temperature ± 0.5 % 10 °C ... 75 °C (the accuracy percentage always refers to the measured value!)

SAL Range 0.0 ... 42.0

Accuracy Test sample temperature ± 0.1 at 5 °C ... 25 °C

± 0.2 at 25 °C ... 30 °C TDS [mg/l] 1 T [°C] NTC 30:

Accuracy± 0.1

PT 1000:

Accuracy Operating temperature

± 0.5 0 °C ... 15 °C

± 0.1 15 °C ... 35 °C

± 1 35 °C ... 55 °C

Overview

Measuring accuracy

(± 1 digit)

(Continuation)

Cell constant,

to be set

Cell constant,

calibrated

Reference tempera-

ture, selectable

T [°F] NTC 30:

Accuracy ± 0.2 PT 1000:

Accuracy Operating temperature ± 0.9 at 32 °F ... 59 °F ± 0.2 at 59 °F ... 95 °F ± 1.8 at 95 °F ... 131 °F

C [cm

-1

] 0.01

0.1

0.250 ... 2.500

C [cm

-1

] 0.450 ... 0.500

0.800 ... 1.200

REF [°C] 20

Temperature input

Dimensions and

weight

Manual [°C] - 5 ... +100

Length [mm] 240 Width [mm] 285 Height [mm] 85 Weight [kg] Approx. 1.1

(without plug-in power supply unit)

Overview

Power 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.: Z850

Order no.: 28520 4889

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.: 28520 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.: Z851

Order no.: 28520 4897

FRIWO FW3288, 11.8453

Friwo Part No. 1770896

Input: 230V ~ / 50 Hz / 23 VA

Output: 6 V = / 1,8 A

EMC and

VDE norms

Interference emission (generic standard)

Overview

EN 50081-1 FCC class A

Interference immuni-

EN 50082-1

ty (generic standard) Protective class 3, EN 61010-1 Climatic class 2, VDI/VDE 3540

Test marks TÜV GS, UL/CUL, CE

Display Multifunctional LCD Keypad Foil keypad (Polyester)

Data storage Ring store for 200 value pairs, conductivity/salinity/TDS,

temperature

Temperature

compensation

Automatic with Pt 1000/NTC (30 k

-5 ... 100,0 °C

Manual input -5 ... 100 °C resolution 1K

Connectors

Measuring cell 8 pole socket with pin contacts RS interface/

analog output

Bidirectional RS 232 interface or analog output with autom. recognition of the PC, printer, or recorder connected

Plug-in power

2 pole special Friwo

supply (option)

Overview

Safety

2 Safety

This operating manual contains basic instructions that you must follow during the commissioning, operation and maintenance of the instrument. 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 measuring cells, etc.

Safety

2.1 Authorized use

This instrument is authorized exclusively for measuring the conductivity, salinity, temperature and TDS (total dissolved solids) in the laboratory. The technical specifications as given in the section

ECHNICAL DATA, must be observed. Only the operation

1.5 T and running of the measuring instrument according to the instructions given in this operating manual is authorized. Any other use is considered unauthorized.

2.2 General safety instructions

This instrument is constructed and tested in compliance with the EN 61010-1 safety regulations for electronic measuring instruments. It left the factory in a safe and secure technical condition.

Function and opera-

tional safety

The smooth functioning and operational safety of the instrument can only be guaranteed if the generally applicable safety measures and the specific safety instructions in this operating manual are followed.

The smooth functioning and operational safety of the instrument can only be guaranteed under the climatic conditions specified in the section 1.5 T

ECHNICAL DATA.

If the instrument was transported from a cold environment to a warm environment, the formation of condensate can lead to the faulty functioning of the instrument. In this event, wait until the temperature of the instrument reaches room temperature before putting the instrument back into operation.

Caution

The instrument is only allowed to be opened by personnel authorized by SCHOTT.

Safety

Safe operation If safe operation is no longer possible, the instrument must

be taken out of service and secured against inadvertent operation. Safe operation is no longer possible if:

l the instrument has been damaged in transport l the instrument has been stored under adverse conditions

for a lengthy period of time

l the instrument is visibly damaged l the instrument no longer operates as described in this

manual

If you are in doubt contact the supplier of the instrument.

Obligations of the

operator

The operator of this measuring instrument must ensure that the following laws and guidelines are observed when using dangerous substances:

l EEC directives for protective labor legislation l National protective labor legislation l Safety regulations l Safety datasheets of the chemical manufacturer.

Safety

Commissioning

3 Commissioning

Perform the following activities for initial comissioning:

l Set the date and time l Connect the plug-in power supply (option).

Setting the date

and time

1 Press and hold down the <ì> key. 2 Press the <on/off> key.

The

display test

appears briefly on the display. The measuring instrument then switches automatically to the setting of the baud rate.

3 Press the <run/enter> key repeatedly until the date

flashes on the display.

4 Set today’s date by pressing <

▲> <▼>.

5 Confirm with <run/enter>.

The date (month) flashes on the display.

6 Set the current month by pressing <

▲> <▼>.

7 Confirm with <run/enter>.

The year appears on the display.

8 Set the current year by pressing <

▲> <▼>.

9 Confirm with <run/enter>.

The hour field flashes on the display.

10 Set the current time by pressing <

▲> <▼>.

11 Confirm with <run/enter>.

The minutes field flashes on the display.

12 Set the current time by pressing <

▲> <▼>.

13 Confirm with <run/enter>. The measuring instrument

then switches to the measuring mode.

14 Switch off the instrument by pressing <on/off>.

Commissioning

Connecting the

plug-in power

supply (optional)

The measuring instrument works battery-powered. It can, however, also be supplied by the plug-in power supply which is available as an accessory.

Warning

The line voltage on site must lie within the input voltage range of the original plug-in power supply unit (see section

ECHNICAL DATA).

1.5 T

Caution

Use original plug-in power supplies only (see section

1.5 T

ECHNICAL DATA).

1 Insert the plug (1) into the socket (2) of the conductiv-

ity meter

2 Connect the original SCHOTT plug-in power supply

(3) to an easily accessible mains socket.

Note

You can also perform measurements without a plug-in power supply.

Operation

4Operation

4.1 Switch on the instrument

1 Place the instrument on a flat surface and protect it

against intense light and heat.

2 Connect the conductivity measuring cell to the instru-

ment.

3 Press the <on/off> key.

display test

The The instrument then switches automatically to the previously selected measuring mode.

4 Check or determine the cell constant [C]. The proce-

dure is described in section 4.3, on page 103.

appears briefly on the display.

Note

The instrument has an energy saving feature to avoid unnecessary battery depletion. The energy saving feature switches the instrument off if no key has been pressed for an hour. The energy saving feature is not active:

l if the power is supplied by the plug-in power supply l if the l if a PC is connected l if the recorder cable is connected l if the printer cable is connected

AutoStore

function is active

(for external printers)

Operation

Checking the cell

constant

1 Press the <CAL> key repeatedly until LF CELL is dis-

played.

2 Press the <run/enter> key.

The previously selected cell constant ist displayed, e. g. 0.475 cm

-1

with a calibrated cell constant.

3 To return to the measuring mode: press the <ì> key

when the correct cell constant ist displayed.

4 If a different cell constant is to be set, proceed ac-

cording to section 4.3 D

CELL CONSTANT [C].

ETERMINING/SETTING UP THE

4.2 Measuring

Operation

Preparatory

activities

Temperature probe Measurements can be performed with and without a temper-

Perform the following activities when you want to measure:

1 Connect the measuring cell to the instrument. 2 Adjust the temperature of the test solutions or mea-

sure the current temperature if the measurement is made without a temperature probe.

3 Calibrate the instrument with the measuring cell or

check the cell constant set up.

4 Select the measuring mode by pressing <

Caution

When connecting an earthed PC/printer, measurements cannot be performed in earthed media as incorrect values would result. The RS232 interface is not galvanically isolated.

ature probe. A connected temperature probe is indicated by TP on the display. If you want to use a SCHOTT conductivity measuring cell without a temperature probe, you have to connect it with an adapter (available at SCHOTT).

ì>.

Note

The conductivity meter automatically recognizes the type of the temperature probe used. As a result, you can connect electrodes with the NTC30 or Pt1000.

The temperature measurement is absolutely essential for a reproducible conductivity measurement. If the measurement is made without a temperature probe, proceed as follows:

1 Determine the current temperature using a thermom-

eter.

2 Set up the temperature by pressing <

▲> <▼>.

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