pH

pH Meters pH Meters Handheld pH meters

Electrodes

Portable pH meters

Accessories

Laboratory pH meters

pH The pH is a measure of the acidity or alkalinity of a sample. A pH of 7 means that the sample is neutral and reacts neither like an acid nor like a base. Fresh tap water, for example, is approximately neutral. Samples with a pH of less then 7 are acidic, e.g. lemonade, lemon juice or hydrochloric acid. In practice pH values down to below -1 are known. An alkaline sample has a pH of more than 7, e.g. stale tap water, water containing detergents or soda lye. The pH scale reaches values of more than 15.

orange juice

sea water

Cola

ammonia

0.4% HCI

-1

0

1

2

milk

3

acidic

4

5

6

7

0.4% NaOH

8

neutral

9

10

11

12

13

14

15

basic/alkaline

The more the pH differs from 7, the more aggressive the sample. For each pH unit the acidic or basic effects increase by a factor of 10. pH can be measured by electrochemical pH measuring systems, indicator strips, indicators or colorimeters. Of these only electrochemical measurements provide accurate results. Measurements are made with an electrode. The electrode is an electrochemical sensor which consists of a measuring electrode and a reference electrode. The voltage at a membrane alters according to the pH of the sample solution. The electrodes normally used today are constructed so that the voltage at the membrane is 0 mV when the pH is 7. The more the pH differs from 7, the larger the voltage signal produced. The pH meter uses this signal to calculate the pH.

Literature 26

Further information on this subject can be requested from WTW:

pH handbook Application reports Offprints

Wissenschaftlich-Technische Werkstätten GmbH & Co. KG · Dr.-Karl-Slevogt-Straße 1 · 82362 Weilheim · Germany · Tel.: +49 (0) 881-1 83-0 · Fax: +49 (0) 881-62 53 9

Laboratory & Field pH

General Features

pH Meters

ORP

pH meters for every application

Classic Robust, impact-resistant, waterproof, transportable, pH depth measurements down to 100 m

32

Laboratory pH meters

inoLab® top quality in 3 stages - simple and reliable - compact and communicative - flexible and powerful

34

Electrodes

favorably priced, universal, reliable

38

pH meter accessories ❍ Calibration and maintenance supplies - for pH measurement - for maintenance and cleaning ❍ Temperature sensors ❍ Recommended accessories - stands and electrode holders - stirrers - measuring and storage vessels

Portable pH meters

For documentation

Software, printer and accessories

44 45

180 46

Colony Counter

ORP measurements

42 42

Oxygen (D.O.)

Portable pH meters

Handheld pH meters

Conductivity

28

MultiParameter

Quality in a set of three - Simple to operate model - Time-proven model with memory function - All-rounder with interface

BOD

Handheld pH meters

ISE

from page

Respiration Sample Preparation

Model

from page 48

Multi-parameter instruments

96

Software, Printers

Turbidity

Ion meters

Photometry

Other instruments with built-in pH measurement

Customer Service

Laboratory pH meters

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27

pH General Information about handheld pH meters can be found on pages 14 - 17.

pH Meters Handheld pH Meters pH 315i, pH 330i and pH 340i

NEW

Features Handy Waterproof Low-power system allows continuous operation for up to 3000 h Easy to use GLP-conform

Pocket-sized precision WTW handheld pH meters are dustproof and waterproof, they can also be submersed. The large and clear multifunctional display allows the values to be read off safely and comfortably. The silicone keypad with tactile response ensures simple operation. Automatic switch-off combined with an energysaving system permits continuous operation for up to 3000 h.

Complete in SET

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Laboratory & Field General Features

Handheld pH Meters

pH 315i, pH 330i, pH 340i

ISE

ORP

pH

handy · waterproof · GLP-conform

WTW handheld pH meters are available in three versions:

Oxygen (D.O.)

pH 315i:

MultiParameter

Conductivity

Very robust and waterproof battery-operated pH/mV meter. Measuring errors are avoided by the silicone keypad with only 5 keys and a simplified calibration method with automatic buffer recognition and display for standard buffers. AutoRead also ensures stable and reproducible results.

pH 330i:

Respiration Sample Preparation

BOD

Very robust and waterproof battery-operated pH/mV meter with built-in datalogger, realtime clock, GLP-supporting functions, display for calibration switchable between pH and mV. MultiCal® automatic calibration with buffer recognition, automatic temperature compensation.

pH 340i:

IP 66 IP 67

3 Year Warranty

Wissenschaftlich-Technische Werkstätten GmbH & Co. KG · Dr.-Karl-Slevogt-Straße 1 · 82362 Weilheim · Germany · Tel.: +49 (0) 881-1 83-0 · Fax: +49 (0) 881-62 53 9

Customer Service

Software, Printers

Turbidity

pH 315i

Photometry

Colony Counter

Very robust and waterproof pH/mV meter for battery or mains supply operation with built-in datalogger, real-time clock, GLP-supporting functions, display for calibration switchable between pH and mV. MultiCal® automatic calibration with buffer recognition, automatic temperature compensation and additional RS 232 analog and digital output.

29

pH

Technical Data Model

pH 315i

pH 330i

Measuring range/ resolution

pH

-2.00 … +16.00 pH

pH

mV

-1999 … +1999 mV

Accuracy (± 1 digit)

Temp. -5.0 … +105.0 °C

-2.000 ... +19.999 pH -2.00 … +19.99 pH mV -999.9 ... +999.9 mV -1999 … +1999 mV Temp. -5.0 ... +105.0 °C

pH

pH

±0.01 pH

pH 340i

mV ±0.3 mV at +15 °C … +35 °C Temp. ±0.1 K

±0.005 pH at +15 … +35 °C mV ±0.3 mV at +15 °C … +35 °C Temp. ±0.1 K

pH

±0.003 pH at +15 … +35 °C mV ±0.2 mV Temp. ±0.1 K

Temperature compensation

Automatic for pH electrodes with built-in temperature sensor, TFK 325 / Pt 1000

Automatic for pH electrodes with built-in temperature sensor, TFK 325 / Pt 1000 manual by entering sample temperature

Display

LCD display 60 x 45 mm visible area, simultaneous display of measurement, temperature, special characters

Sensor evaluation

Depends on calibration results, shown on display

Calibration alarm

–

1 ... 999 days, adjustable

AutoRead

For reproducibility better than 0.05 pH

For reproducibility better than 0.02 pH

Calibration

Simplified 1, 2 or 3-point calibration with automatic buffer recognition AutoCal automatic 3-point calibration with DIN buffers

MultiCal® automatic calibration: AutoCal automatic 2 or 3-point calibration with DIN buffers AutoCal-TEC automatic 2 or 3-point calibration with WTW technical buffers ConCal® conventional 1-point calibration with any buffers

Calibration protocol

–

GLP-conform calibration protocol; last protocol stored in memory

Data storage

–

500 data sets (measurement, temperature, date/time, identity no.); time-controlled storage at intervals 5 s ... 60 min, non-volatile data storage (even when changing batteries)

Data output

Via display

Via display

Via display or interface, time-controlled at intervals 5 s ... 60 min

Interface

–

–

Self-configuring as analog output according to electrode potential, i.e. 50 - 60 mV/pH unit, or RS 232 bi-directional interface

Operating period

3000 hours with normal 4 x 1.5 V batteries (AA) with AutoSwitchOff after 1 h (except logger operation)

Protection type

IP 66 and IP 67 to IEC 529

Dimensions

172 x 80 x 37 mm (H x B x D)

Weight

Approx. 300 g

Certified to

CE, TÜV/GS, UL and/or cETLus, CUL

Warranty

3 years

3000 hours continuous operation with batteries, optional mains power supply, no rechargeable batteries

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Laboratory & Field General Features

Handheld pH Meters

SET Equipment

pH

Each handheld pH meter is available in a complete application-oriented set

Basic equipment:

Robust and waterproof handheld pH meter, for battery operation

2A10-100

pH 330i

Robust and waterproof handheld pH meter with datalogger, for battery operation

2A20-100

pH 340i

Robust and waterproof handheld pH meter with datalogger and serial interface, for battery operation

2A30-100

pH 340i

Robust and waterproof handheld pH meter with datalogger and serial interface, for battery or mains operation

2A30-110

Ordering Information SETs Handheld pH meter, with electrode, professional case and accessories

2A10-101

pH 330i

Handheld pH meter, with electrode, professional case and accessories

2A20-101

pH 340i

Handheld pH meter, with electrode, professional case and accessories

2A30-101

pH 340i

Handheld pH meter with mains power supply, with electrode, professional case and accessories

2A30-111

Colony Counter

Order No.

pH 315i

SenTix® electrodes – please select one pH combination electrode, gel electrolyte pH combination electrode, gel electrolyte and temperature sensor TFK 325/HC pH combination electrode with built-in temperature sensor, gel electrolyte SenTix® 81 pH combination electrode with built-in temperature sensor and measuring vessel for drinking water

SET ordering example pH 315i + SenTix® 41 electrode

1 1

1

2 T

2A10-101

2

Note: other electrodes in SET or instrument versions for 120 VAC/60 Hz are available on request.

Customer Service

Please refer to page 38 for electrodes and page 42 for further accessories.

Photometry

SenTix® 21 SenTix® 21 SenTix® 41 Drinking water kit

Turbidity

Handheld pH Meters SETs

BOD

Order No.

pH 315i

Software, Printers

Handheld pH Meters

Respiration Sample Preparation

Ordering Information Handheld pH Meters

MultiParameter

Conductivity

Oxygen (D.O.)

ISE

ORP

• Professional case with built-in measuring set-up and separate compartment for electrode and accessories • Instrument including batteries • Electrode as chosen • STH 320 stand • WTW technical buffers pH 4.01 - 7.00 • KCl solution (3 mol/l) • Beaker • Plug-in power supply (only pH 340i) • Operating instructions

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31

pH General Information about portable pH meters can be found on pages 18 – 19.

pH Meters Portable pH Meters ProfiLine pH 197 and ProfiLine pH 197-S

Features

3 Year Warranty

IP 66 IP 67

Robust

WTW portable pH meters

Shockproof

The WTW pH meters of the ProfiLine pH 197 series are both hose-proof (IP 66) and submersible (IP 67. They convince because of their high degree off operator comfort and safe operator guidance via the large multifunctional display. They are equipped with a carrying/support handle and carrying strap as standard.

Waterproof Portable Reliable Standard pH measurement and pH measurement at depths down to 100 m

The portable pH meters are available in 2 versions:

ProfiLine pH 197: Indestructible pH/mV meter. With rechargeable battery and mains operation, measurement storage, GLP-supporting functions, MultiCal®‚ automatic calibration, automatic temperature compensation... Also suitable for pH depth measurements down to 100 m with TA 197 pH depth armature.

ProfiLine pH 197-S: As ProfiLine pH 197 but with additional analog recorder outputs corresponding to display for pH/mV and temperature values.

Accessories for pH measurement at depths down to 100 m pH depth armature TA 197 pH with built-in temperature sensor, up to 100 m cable with waterproof plug (IP 67), steel armoring (material no. 1.4571) with screw-off protective hood, pressure-resistant to max. 10 bar, fits into 2” boreholes, without combination electrode (see page 33).

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ProfiLine pH 197

Measuring range/ resolution

pH mV Temperature

-2.00 ... +16.00 pH -1250 ... +1250 mV -5.0 ... +99.9 °C

ProfiLine pH 197-S

Accuracy (± 1 digit)

pH mV Temperature

±0.01 pH ±2 mV ±0.1 K

Temperature compensation

Automatic for pH electrodes with built-in temperature sensor TFK 325 / Pt 1000 manual by entering sample temperature

Display

LCD display 60 x 35 mm visible area, simultaneous display of measurement, temperature, special characters

AutoRead

For reproducibility better than 0.02 pH

Calibration

MultiCal® automatic calibration AutoCal automatic 2-point calibration with DIN buffers AutoCal-TEC automatic 2-point calibration with WTW technical buffers ConCal® conventional 1 or 2-point calibration with any buffers

Data storage

Ring memory for 50 pairs of measurements with data protection

Data output

Via display or interface

Interface

Unidirectional RS 232 interface

Operating time

Continuous operation from mains supply; 1500 hours with rechargeable batteries with AutoSwitchOff after 1 h

Protection type

IP 66 and IP 67 to IEC 529

Dimensions

230 x 185 x 90 mm (B x D x H)

Weight

Approx. 1.5 kg

Certified to

CE, TÜV/GS, UL, CUL

Warranty

3 years

Oxygen (D.O.)

ISE

ORP

pH

Model

General Features

Technical Data

Order No.

ProfiLine pH 197

Robust, waterproof, submersible pH/mV meter

100 350

ProfiLine pH 197-S

As ProfiLine pH 197, but additionally with 2 analog recorder outputs

100 315

Note: 120 VAC / 60 Hz versions on request

Standard pH combination electrode 103 635

Depth armatures for pH measurements with ProfiLine pH 197 and ProfiLine pH 197-S pH depth armatures with built-in temperature sensors, cable (length optional) with waterproof plug (IP 67) 1.4571 steel armoring and screw-off protective hood, pressure-resistant to max. 10 bar, fits into 2” boreholes, without combination electrode Cable length

Order No.

Cable length

Order No.

TA 197 pH-4

4m

108 260

TA 197 pH-25

25 m

108 265

TA 197 pH-6

6m

108 261

TA 197 pH-40

40 m

108 266

TA 197 pH-10

10 m

108 262

TA 197 pH-60

60 m

108 267

TA 197 pH-15

15 m

108 263

TA 197 pH-100

100 m

108 268

TA 197 pH-20

20 m

108 264

Combination electrodes suitable for depth armature TA 197 pH pH combination electrode for heavily polluted waters

109 115

SensoLyt® GDA

pH combination electrode for surface waters and slightly polluted waters

109 116

SensoLyt® PtA

ORP combination electrode

109 125

Please refer to page 38 for electrodes and page 42 for further accessories.

Customer Service

SensoLyt® SEA

Photometry

Colony Counter

For other electrodes and buffer solutions see Accessories

Turbidity

pH combination electrode with built-in temperature sensor and waterproof plug, immersion depth 120 mm

Software, Printers

Portable pH meters

Respiration Sample Preparation

BOD

MultiParameter

Conductivity

Unidirectional RS 232 interface 2 analog recorder outputs for measurement and temperature output corresponding to display

Ordering Information

SenTix® 41

Laboratory & Field

Portable pH Meters

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33

pH General Information about laboratory pH meters can be found on pages 20 - 25.

pH Meters Laboratory pH Meters inoLab® pH Level 1 inoLab® pH Level 2 inoLab® pH Level 3

inoLab® Level 1

Think innovative inoLab® pH Level 1: simple and reliable

Features Performance-oriented instrument range

Routine laboratory pH/mV meter with large multifunctional display for pH and temperature, automatic temperature compensation, MultiCal® calibration system; for battery or mains operation.

Simplified operator convenience

AutoRead automatic drift control for stable and reproducible measurements

Mains-independent Suitable as bench and wall-mounted models

inoLab® Level 2

Country-specific units ISO-conform documentation Application-oriented displays

See innovative inoLab® pH Level 2: compact and communicative Precision pH/mV meter with large multifunctional display for pH and temperature, automatic temperature compensation, MultiCal® calibration system, built-in measurement storage with GLP-conform documentation and digital interface. Option: with built-in printer (paper width 112 mm) and thermal paper accepted for use in official documents.

34

MultiCal® automatic calibration

IP 43

Feed and on/off keys keys for controlling the built-in printer

3 Year Warranty

Wissenschaftlich-Technische Werkstätten GmbH & Co. KG · Dr.-Karl-Slevogt-Straße 1 · 82362 Weilheim · Germany · Tel.: +49 (0) 881-1 83-0 · Fax: +49 (0) 881-62 53 9

General Features

Touch innovative

pH

inoLab® pH Level 3 with Terminal Level 3: flexible and powerful High-performance pH/mV/ion meter with graphics display and digital recorder function for pH, temperature and ion-selective measurement, automatic temperature compensation, high resolution (0.001 pH), MultiCal® calibration system, built-in measurement storage with GLP-conform documentation and digital interface. PC keyboard interface for connecting an external keyboard or a barcode reader. Includes software for direct control by PC. Option: with built-in printer (paper width 112 mm) and thermal paper accepted for use in official documents.

AutoRead automatic drift control for stable and reproducible measurements RUN/ENTER triggers the measuring process

IP 43

3 Year Warranty

Built-in digital plotter Connection for bar-code reader or PC keyboard Selectable instrument language Extended GLP functions Free-of-charge downloads for inoLab® pilot or terminal

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Respiration Sample Preparation Colony Counter

Graphic evaluation possible

Photometry

Freely selectable buffer sets

Turbidity

5-point calibration by linear regression

Software, Printers

Features

Customer Service

Terminal Level3

BOD

MultiParameter

Conductivity

Oxygen (D.O.)

ISE

menu-guided graphics display

ORP

inoLab® Level 3

Laboratory & Field

Laboratory pH Meters

35

pH Technical Data Model

pH Level 1

Range/ Resolution

pH mV Temp.

Accuracy (±1 digit)

pH mV Temp.

pH Level 2

pH Level 3

±0.005 pH from -2 ...105 °C ±0.01 pH ±0.3 mV ±1 mV ±0.1 K

±0.003 pH from -2 ...105 °C ±0.01 pH ±0.2 mV

-2.000 ... +19.999 pH -2.00 ... +19.99 pH -999.9 ... +999.9 mV -1999 ... +1999 mV -5.0 ... +105.0 °C ±0.005 pH from -2 ...105 °C ±0.01 pH ±0.3 mV ±1 mV ±0.1 K

Temperature compensation pH

0... +99 °C automatically with TFK 150, TFK 325 or Pt-1000, or -20... +130 °C if sample temperature entered manually

AutoRead

For reproducibility better than 0.02 pH

Real-time clock

–

Calibration

MultiCal® automatic calibration AutoCal: automatic 2-/3-point calibration with DIN buffers

±0.1 K

yes

AutoCal-TEC: automatic 2-/3-point calibration with WTW technical buffers ConCal®: conventional 1-/2-point calibration with any buffers

MultiCal® automatic calibration AutoCal: automatic 2-/3-/5-point calibration with DIN buffers AutoCal-TEC: automatic 2-3-point calibration with WTW technical buffers ConCal®: conventional 1-/2-point calibration with any buffers ISECal: 2 and 3 point calibration with standard solutions

Calibration protocol

–

GLP-conform protocol of calibration; last calibration stored in memory

Calibration timer

–

adjustable, 1... 999 days

Sensor evaluation

Depends on the calibration results, shown in display

Limit values

–

Data memory

–

Data output

Display only

Display or interface

Display, interface or PC

Analog interface

–

Corresponds to electrode potential, i.e. 50... 62 mV/pH unit

Analog output corresponding to display in combination with terminal Level 3

Digital interface

–

Bidirectional RS 232

Bidirectional RS 232

Operating period/ Energy supply

3000 h with commercially available 4 x 1.5 V batteries or mains power supply

manual limit input with acoustic alarm 200 records (measurement, temperature) 2000 records (measurement, temperature)

Protection type

IEC 529 / IP 43 without built-in printer

Dimensions

230 x 210 x 70 mm (B x D x H)

250 x 300 x 70 mm (B x D x H)

Weight

1.3 kg

1.6 kg

Certified to

CE, TÜV/GS, UL, CUL

Warranty

3 years on the instrument

With terminal: universal plug-in power supply 230 VAC or 120 VAC Without terminal: via PC keyboard interface

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Laboratory & Field General Features

Laboratory pH Meters

pH

Ordering Information for inoLab® pH meters inoLab® laboratory pH meters Compact precision pH meter with serial interface

1A20-110

inoLab® pH Level 2

Compact precision pH meter, additionally equipped with built- in printer for GLP-conform documentation

1A21-110

inoLab® pH Level 3

Flexible and powerful – the intelligent pH measuring place consisting of multifunction box and universal terminal, with PC software/connection cable

1A30-110

inoLab® pH Level 3

The intelligent pH measuring place, additionally equipped with built-in printer

1A31-110

inoLab® pH Level 3

The integrated pH measuring place, with PC software/connection cable, without printer/terminal

1A32-100

ISE

1A10-110

inoLab® pH Level 2

Ordering Information for inoLab® pH meters SETs – “ready to go” inoLab® pH SETs

1A10-111

inoLab® pH Level 2

Including electrode, passive multifunction box and accessories

1A20-111

inoLab® pH Level 2

Including built-in printer, electrode, passive multifunction box and accessories

1A21-111

inoLab® pH Level 3

Including terminal, electrode and accessories

1A30-111

inoLab® pH Level 3

With built-in printer, including terminal, electrode and accessories

1A31-111

inoLab® pH Level 3

Without printer/terminal, with PC software/connection cable, electrode and accessories

1A32-101

BOD

Including electrode, passive multifunction box and accessories

MultiParameter

Order No.

inoLab® pH Level 1

Conductivity

Oxygen (D.O.)

Simple and reliable pH meter for routine work

ORP

Order No.

inoLab® pH Level 1

21 41 61 81 HW

1

pH combination electrode, gel electrolyte pH combination electrode with built-in temperature sensor, gel electrolyte pH combination electrode, liquid electrolyte pH combination electrode with built-in temperature sensor, liquid electrolyte Precision electrode with ground diaphragm

SET ordering example inoLab® pH Level 1 + SenTix® 61 electrodes

2 3 4 H

1A10-111

3

Note: other electrodes in SET, instrument versions for 120 VAC/60 Hz or BNC versions are available on request

Customer Service

Software, Printers

Turbidity

Photometry

Please refer to page 38 for electrodes and page 42 for further accessories.

Colony Counter

SenTix® SenTix® SenTix® SenTix® SenTix®

Respiration Sample Preparation

SenTix® electrodes – please select one

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37

pH ®

SenTix The clever idea for filling SenTix® electrodes Anyone who has to frequently work with pH electrodes knows about the awkward properties of KCl solution: • it climbs up beaker walls, • it penetrates even the finest pores and cracks and • it crystallizes out leaving an unpleasantlooking residue.

Topping up the electrolyte solution of combination electrodes and reference electrodes seldom happens without some drops escaping and forming harmless but nasty-looking crystalline stains in a very short time. This is why this should always be carried out on a working surface. This can even happen with the new range of SenTix® electrodes, but far less often when it is carried out correctly. But how?

Take the enclosed plastic dropping bottle and: • remove the red cap • cut off tip – if still sealed – as near the end as possible so that the tip can be inserted in the refilling hole of the SenTix® electrode to seal it off • in order to prevent overpressure in the electrode squeeze the dropping bottle gently and then insert the tip into the refilling hole so that the dropped bottle is seated firmly in the refilling hole. • by releasing and squeezing the bottle several times in succession (pumping) the topping-up process can be carried out perfectly without any mess

®

SenTix electrodes

SenTix® – the new electrode system from WTW offers more comfort, quality and precision ● The low-impedance membrane glass ensures that stable measurements are rapidly achieved even at low sample temperatures ● The reference electrolyte with its low silver ion content together with the temperature-insensitive platinum diaphragm prevent interference by precipitated silver. ● SenTix® electrodes are robust and shockproof. A special membrane glass and the plastic shaft ensure mechanical stability. ● SenTix® with liquid electrolyte – the optimized outflow speed rinses the platinum diaphragm free and prevents contamination by precipitates or dirt even during changes in temperature; with new membrane glass for even quicker response. ● SenTix® H and HW ground diaphragm electrodes allow the electrolyte outflow speed at the diaphragm to be altered. ● The clever sliding closure prevents the electrolyte from escaping during storage. ● Waterproof DIN or BNC plugs, either plug head system or with fixed cables, can be selected.

High-quality pH electrodes with liquid electrolyte for demanding work: SenTix® 60, SenTix® 61, SenTix® 62 SenTix® 81, SenTix® 82

pH electrodes with gel electrolyte for routine measurements on-site or in the laboratory: SenTix® 20, SenTix® 21, SenTix® 21-3, SenTix® 22, SenTix® 41, SenTix® 41-3, SenTix® 42 Surface pH electrode SenTix® Sur Penetration pH electrode SenTix® Sp

pH micro electrode SenTix® Mic

38

Precision pH electrode SenTix® H and SenTix® HW Wissenschaftlich-Technische Werkstätten GmbH & Co. KG · Dr.-Karl-Slevogt-Straße 1 · 82362 Weilheim · Germany · Tel.: +49 (0) 881-1 83-0 · Fax: +49 (0) 881-62 53 9

Order No.

Connection Electrode cable Electrode plug

103 631 as SenTix® 20, but with: Fixed cable Length 1 m DIN plug

103 640 as SenTix® 60, but with: Fixed cable Length 1 m DIN plug

SenTix® 21-3

SenTix® 41-3

103 632 as SenTix® 20, but with: Fixed cable Length 3 m DIN plug

103 636 as SenTix® 41, but with: Fixed cable Length 3 m DIN plug banana plug

SenTix® 22

SenTix® 42

SenTix® 62

SenTix® 82

103 633 as SenTix® 20, but with: Fixed cable Length 1 m BNC plug

103 637 as SenTix® 41, but with: Fixed cable Length 1 m BNC plug

103 641 as SenTix® 60, but with: Fixed cable Length 1 m BNC plug

103 643 as SenTix® 81, but with: Fixed cable Length 1 m BNC plug

Technical Data Order No. Measuring range pH Operating range °C Reference electrolyt Internal buffer Membrane shape Membrane resistance Diaphragm Shaft material Shaft length Shaft diameter Connection Electrode cable Electrode plug Temperature sensor

Laboratory & Field General Features Oxygen (D.O.)

SenTix® 61

MultiParameter

SenTix® 21

DIN plug and banana plug built-in NTC (30 KΩ)

Conductivity

DIN plug and banana plug built-in NTC (30 KΩ)

pH

103 642 0 ...14 pH 0 ...100 °C KCl 3 mol/l, Ag+-free pH = 7.0 ±0.25 conical