18

Laboratory Catalogue 2004

1st Edition

18 19

Laboratory Catalogue 2004

1st Edition

19

High-resolution pH-meter, 0.001 pH and 0.1 mV. With different measurement programmes, and ease of communication with a PC. This is an ideal pH-meter for research labs.It also has the appropriate specifications for working with ion selective electrodes.

Key features

Direct control over a magnetic or rod stirrer, speed and on/off switch.

Interface for 40-column printer or for computer. If connected to a PC, the interface is two-way.

Interface for a PC keyboard, a useful feature for personalising reports.The measurement data appear both on the display and on the printed reports. See examples.

Capable of working with I.S.E., ion-selective electrode- Calibration at 2 or 3 points. - Direct reading in concentration

(mol/l, g/l or ppm).

Communications software, optional, which facilitates remote control of the pH-meter, data transfer and storage on a PC.

Special calibration. Apart from calibration with standard buffers, the GLP 22 can be calibrated using any reference solution. Capacity for registering the pH electrode history. The following details can be queried: electrode identification, type and number, date of installation, number of measurements taken, total measuring time, minimum and maximum pH values and temperature at which the electrode has been working and details of the last 10 calibrations.

Lab pH-meter, GLP 22

Password to protect the measure-ment programme.Built-in clock, thanks to which the instrument can also be used as a calendar, clock and chronometer.

Display of the time taken for each measurement. The higher this is, the faster the electrode is deteriorating.

Permanently enabled data logger. A constant database with the last 447 measurements with date and time of measurement, user, duration of the measurement and sample code. This information can be viewed on the display panel or sent to a printer or PC.Graphic reports can be obtained of measurements made in continuous mode.Two different modes of operation, one functional, simple and the other advanced, with 4 configurable measurement programs.

18

Laboratory Catalogue 2004

1st Edition

18 19

Laboratory Catalogue 2004

1st Edition

19

Display examples

During start-up...select language

Reading under way during measurement by stability.

Reading complete

Indications to be followed during calibration.

In functional mode, the GLP 22 works like a classical pH-meter, the user does not have access to modify any of the parameters:- measures pH with resolution of

0.01 pH.- stability reading mode.- calibration with two buffers.- transfer of data to a printer or a PC.

In advanced mode, however, the user can confi gure up to 4 different programs, selecting:- measurement mode: by stability,

continuous or by time.- measurement resolution.- the units of measurement: pH, mV

or ISE:- calibration with 2 or 3 buffers.- buffer type, technical or NIST

values.- limits to the measurement, making

quality control of the samples or process monitoring easier. An acoustic signal warns the user of the existence of abnormal measurements.

- an end point, with a warning once this has been reached.

Details on calibration

Measuring with selective electrode.

Electrode history.

Example of a report from a printer

Report of measurements with selective electrode.

Data-logger report

Reading under way during

Electrode history.

Measuring with selective electrode.

Reading complete

Indications to be followed during

PC display example

20

Laboratory Catalogue 2004

1st Edition

20 21

Laboratory Catalogue 2004

1st Edition

21

OperationThe GLP 22 software has been designed so that the operator can use this high-performance pH-meter by following on-screen instructions, using a simple keypad and practically without having to read the instructions manual.

Communications software GLP-PCSoftware for Windows, making capture and availability of data on PC easier.The GLP 22 can be operated from a PC thanks to its two-way RS 232 C interface.

GLP 22 (continuation)

PLUG-IN POWER SUPPLY: The instrument is supplied with a 230 VAC plug-in power supply. For 115 VAC, please specify when ordering.SENSORS: Electrodes. Please see pages 36... ATC Temperature probe, Please see page 44ACCESSORIES: flexible arm, electrode cable and 250 ml bottles of pH 4 and pH 7 buffer and electrolyte.OPTIONAL ACCESSORIES: See page 61

CertificatesThe GLP 22 is supplied with the specifications Certificate and the EC Declaration of Conformity as per directive EMC 89/336/EC.For further information, please see page 132.

Technical specifications

Measuring ranges pH -2 ... 16, mV ± 2000, ºC -20 ... 150 and relative mV, mol / l 10-5 ...10-1 (or ppm or g/l).

Resolution Standard, 0.01 pH, 1 mV, 0.1ºC. Selectable, 0.1, 0.001 pH, 0.1 mV.

Measuring error (± 1 digit) ≤ 0.003 pH, ≤ 0.2 mV, ≤ 0.2 ºC.

Reproducibility (± 1 digit) ± 0.01 pH, ± 1 mV, ± 0.1 ºC. ± 0.001 pH, ± 0.1 mV, ± 0.1 ºC.

Input impedance > 1012 Ohm (Ω).

Autom. temperature compensation With Pt 1000 ATC probe or entering data using the keypad.

pH calibration In 2 or 3 points, validity 0 h…7 days. Special calibration, 1 selectable point between 0…14 pH. Recalibration warning with option of forced recalibration. Rejection of defective electrodes. Accepted electrode values: - slope 50... 65 mV/pH, at 25 ºC. - sensitivity 86... 110%. - asymmetry potential ± 40 mV.

Autom. buffer recognition Technical pH 2.00, 4.01, 7.00, 9.21, 10.90, (at 25ºC). NIST pH 1.679, 4.0061, 6.865, 9.180, 10.254, (at 25ºC).

History of pH electrode Last 10 calibrations, No. of measurements, etc.

Measuring programs A fixed one and four user-modifiable ones.

Data logger Storage capacity: 447 readings. Alphanumeric and graphical reports

Display Alphanumeric backlit crystal display. 4 lines of 20 characters.

Languages English, spanish, french, italian.

Power up diagnostic RAM, EPROM, EEPROM memories, display and keypad.

Inputs and outputs Measuring electrode, BNC connector. Reference electrode, banana Ø 4. ATC, Pt 1000 type, telephone or banana connector Ø 4. Interface for standard PC keyboard. Interface RS 232 C, bidirectional. Polarising current, 10 µA (i.e. for Karl Fischer). Analog outlet, electrode potential follower. Control for CRISON stirrer: On/Off and speed.

Power supply 12 VDC / 275 mA external power supply

Electrical safety Meets EC, EN 61010.

EMC (Electromagnetic compatibility) Meets EC, EN 50081-1 and EN 50082-1.

Permitted ambient conditions Operating temperature 5...40 ºC Storage and transport temperature -15... 65 ºC. < 80 % relative humidity, non condensing.

Enclosure Casing material, high density polyurethane.

Physical parameters Weight 1.580 g, dimensions 180 x 215 x 130 mm.

Specifications suject to change without notice

Ordering informationCode Description

22 00 GLP 22 with accessories, without electrode

22 01 GLP 22 with accessories and electrode 52 01, with integrated ATC

22 02 GLP 22 with accessories and electrode 52 02

22 03 GLP 22 with accessories, electrode 52 02 and ATC 55 31

22 04 GLP 22 with accessories, electrode 52 01 and magnetic stirrer