pH METERS

Handheld pH Meters
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.
WTW handheld pH meters are available in three versions:

• pH 315i: 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: 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: 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.

Portable pH Meters
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.
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.

Laboratory pH Meters
The Laboratory pH meters are available in 3 versions:

• inoLab® pH Level 1:Routine laboratory pH/mV meter with large multifunctional display for pH and temperature, automatic temperature compensation, MultiCal® calibration system; for battery or mains operation.

• inoLab® pH Level 2: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.

• inoLab® pH Level 3: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.

Handheld Oxygen Meters
WTW handheld oxygen meters are both dustproof and waterproof as well as being submersible. The large clear display with operator guidance allows the measurements to be read off unambiguously and comfortably. The silicone keys with tactile answerback guarantee simple operation.

WTW handheld oxygen meters are available in three versions:

• Oxi 315i : Simple, robust handheld meter with simplified keypad, without memory function and with no manual input facilities; together with DurOx 325 particularly suitable for use in aeration tanks

• Oxi 330i : Proven robust battery-operated handheld meter with manual input functions, built-in datalogger, GLPsupporting functions, automatic temperature, air pressure and salinity compensation.

• Oxi 340i : As Oxi 330i, but with additional analog and digital RS 232 output and mains power supply as option

Portable oxygen meters
The WTW oxygen meters of the ProfiLine Oxi 197 series are both hose-proof (IP 66) and submersible (IP 67). They convince because of their high degree of operator comfort and foolproof operator guidance via the large multifunctional display. They are equipped with a carrying/support handle and carrying strap as standard.
The portable oxygen meters are available in 2 versions:

• ProfiLine Oxi 197 : Indestructible oxygen meter. With rechargeable battery and mains operation, measurement storage, GLP-supporting functions, OxiCal® rapid calibration, AutoBar automatic air pressure compensation by built-in pressure sensor, automatic temperature compensation by IMT compensation. Additional connection for self-stirring oxygen sensor StirrOx® G. Also suitable for oxygen depth measurements down to 100 m with TA 197 Oxi depth armature.

• ProfiLine Oxi 197-S : As ProfiLine Oxi 197 but with additional analog recorder outputs corresponding to display for oxygen and temperature values.

Portable oxygen meters
The WTW oxygen meters of the ProfiLine Oxi 197 series are both hose-proof (IP 66) and submersible (IP 67). They convince because of their high degree of operator comfort and foolproof operator guidance via the large multifunctional display. They are equipped with a carrying/support handle and carrying strap as standard.
The portable oxygen meters are available in 2 versions:

• inoLab® Oxi Level 2 : Standard laboratory oxygen meter with large multifunctional display for routine use in the laboratory. Automated functions such as air pressure correction, temperature compensation by the IMT method and OxiCal® rapid calibration make work easier. The built-in measurement store, the analog and digital output RS 232 as well as the optional built-in printer (paper width 112 mm) guarantee QA-conform documentation.The StirrOx® G can be operated by the inoLab® Oxi Level 2 for BOD5 determination according to DIN EN 1899-1 resp. DIN EN 1899-2 with manual start/stop functions.

• inoLab® Oxi Level 3 : High-performance oxygen meter with graphics display and digital recorder function for oxygen measurement in the laboratory. Automated functions such as air pressure correction, temperature compensation by the IMT method and OxiCal® rapid calibration make work easier. The built-in measurement store, the digital output RS 232 and the optional built-in printer guarantee QA-conform documentation. The StirrOx® G can be operated by the inoLab® Oxi Level 3 for BOD5 determination according to DIN EN 1899-1 resp. DIN EN 1899-2 with automatic start/stop functions.

Handheld Conductivity Meters
Universal conductivity meters with large multifunction display for measurement of conductivity, temperature, salinity and total dissolved solids. With the proven dirt-insensitive Tetracon® 4-electrode system they offer the highest degree of precision and operating comfort. WTW Handheld Conductivity Meters are available in three versions:

• Cond 315i : The simple conductivity meter for meeting higher demands. With only 5 keys for error-free measurement with parallel temperature measurement, automatic temperature compensation, 4-electrode measuring technology.

• Cond 330i : Robust and waterproof handheld conductivity meter for battery operation; with parallel temperature display, integrated datalogger, GLP supporting functions, automatic and manual temperature compensation with linear temperature function and non-linear function for ultrapure water and natural waters according to DIN 38 404 and EN 27 888. The temperature compensation can be switched off; either 20 °C or 25 °C can be selected as the reference temperature.

• Cond 340i : As Cond 330i, but with additional analog and digital RS 232 output and optional mains power supply

Portable conductivity meters
The WTW conductivity meters of the ProfiLine LF 197 series are both hose-proof (IP 66) and submersible (IP 67). They convince because of their high degree of operator comfort and foolproof operator guidance via the large multifunctional display. They are equipped with a carrying/support handle and carrying strap as standard. The portable conductivity meters are available in 2 versions:

• ProfiLine LF 197 : ProfiLine conductivity meter, extremely robust, hose-proof (IP 66) and submersible (IP 67), for connection of TetraCon® 325 4-electrode measuring cells and depth armature TA 197 LF with up to 100 m cable, with large multifunctional display for temperature and measurement, automatic temperature compensation, selectable reference temperature of 20 °C or 25 °C, built-in memory, TDS and salinity measurements, RS 232 digital output, integrated carrying and support handle, built-in electrode storage sleeve, for rechargeable battery and mains operation, and including plug-in power supply and carrying strap

• ProfiLine LF 197-S : As ProfiLine LF 197 but with 2 analog outputs corresponding to display for conductivity and temperature values

Laboratory Conductivity Meters
The Laboratory Conductivity meters are available in 3 versions:

• inoLab® Cond Level 1 : Routine laboratory conductivity meter with large multifunctional display, parallel temperature display and automatic temperature compensation. 20 °C or 25 °C can be set as reference temperature. Both TDS and salinity measurements are possible as well as conductivity and temperature. The ability to set different cell constants means that other special conductivity cells can be connected as well as the TetraCon® 325 4-electrode conductivity cell and LR 325/01 ultrapure water conductivity cell

• inoLab® Cond Level 2 : Standard laboratory conductivity meter with large multifunctional display, parallel temperature display and automatic temperature compensation. An integral measurement store with logger function and a real-time clock allow QA-conform data acquisition. The optional built-in printer allows data printout on thermal paper accepted for use in official documents. 20 °C or 25 °C can be set as reference temperature. Both TDS and salinity measurements are possible as well as conductivity and temperature. The ability to set different cell constants means that other special conductivity cells can be connected as well as the TetraCon® 325 4- electrode conductivity cell and LR 325/01 ultrapure water conductivity cell

• inoLab® Cond Level 3 : High-performance laboratory conductivity meter with graphics display and digital recorder function, parallel display of temperature and automatic temperature compensation. An integral measurement store with logger function and a real-time clock allow QA-conform data acquisition. The optional built-in printer allows data printout on thermal paper accepted for use in official documents. 20 °C or 25 °C can be set as reference temperature. Both TDS and salinity measurements are possible as well as conductivity and temperature. The ability to set different cell constants means that other special conductivity cells can be connected as well as the TetraCon® 325 4-electrode conductivity cell and LR 325/01 ultrapure water conductivity cell.An PC keyboard interface allows an external keyboard or a barcode reader to be connected.

Handheld Multi-Parameter Instruments
The hose-proof (IP 66) and submersible (IP 67) instrument with mains power or batteries is optimal for use in the field, laboratories or production sites. Simultaneous connection of a pH/ORP electrode and an oxygen sensor or conductivity cell allows up to three parameters (including temperature) to be measured at the same time.

• Multi-Parameter Instruments pH/Oxi 340i and pH/Cond 340i : WTW handheld multi-parameter instruments stand for precise multi-parameter measuring technology. The pH/Oxi 340i for the determination of pH, oxygen and temperature and the pH/Cond 340i for the determination of pH, conductivity and temperature are favorably-priced alternatives to the single parameter instruments for applications which require the measurement of several parameters. The instruments are both hose-proof (IP 66) and submersible (IP 67), extremely robust and therefore ideally suitable for on-site, laboratory and factory use.

Laboratory Multi-Parameter Instruments
The Laboratory Conductivity meters are available in 2 versions:

• inoLab® Level 1
  • inoLab® pH/Oxi and inoLab® pH/Cond Level 1 : The routine instruments inoLab® pH/Oxi Level 1 and inoLab® pH/Cond Level 1 are favorably-priced models for initial processing of pH / oxygen and pH / conductivity measurements respectively. Their large multifunction display means that they are suitable for standard measurements where GLP-documentation is not required.
  • inoLab® Multi Level 1 : The inoLab® Multi allows the measurement of pH and ORP, oxygen content, conductivity and salinity as well as the temperature. It is a favorably-priced model for initial processing of routine measurements. Its large multifunction display means that it is suitable for standard measurements where GLPdocumentation is not required.

• inoLab® Level 3
  • inoLab® pH/Oxi and inoLab® pH/Cond Level 3 : As high-end instruments the inoLab® pH/Oxi Level 3 and inoLab® pH/Cond Level 3 have a resolution of 0.001 pH units. They also have all the functions necessary for making ion selective measurements. With the inoLab® pH/Oxi Level 3 oxygen is measured as %, mg/l or mbar. The inoLab® pH/Cond Level 3 can be used to measure the salinity and TDS (Total Dissolved Solids) as well as the conductivity and specific resistance. The optional built-in printer as well as the graphics display with operator guidance increase the measuring comfort and allow QA-conform documentation.
  • inoLab® Multi Level 3 : The inoLab® Multi Level 3 is a high-end instrument with a resolution of 0.001 pH units. It also has all the functions necessary for making ion selective measurements. The salinity and TDS (Total Dissolved Solids) can be measured as well as the conductivity and specific resistance. Oxygen is measured as %, mg/l or mbar. The optional built-in printer as well as the graphics display with operator guidance increase the measuring comfort and allow QA-conform documentation.

Dilution BOD
BOD5 measurements can be carried out with all WTW laboratory oxygen meters. The instruments as the complete range of accessories are described in the “oxygen meters” section.

• inoLab® BSB/BOD Level 3 : inoLab® BSB/BOD Level 3 with terminal, self-stirring StirrOx® G oxygen sensor and bar-code reader

• ProfiLine Oxi 197, Oxi 197-S : Laboratory oxygen meters ProfiLine Oxi 197 and ProfiLine Oxi 197-S with self-stirring oxygen sensor StirrOx® G

OxiTop®
Despite all discussions about quicker alternative methods, the determination of the biological oxygen demand BOD has not become any less important. On the contrary, it is still one of the most important measurements for the management of water resources and allows statements to be made about the loading of waters and wastewater with biodegradable substances. The importance of the respirometric BOD measurement is also shown by the inclusion of the “Determination of the biochemical oxygen demand after n-days (BODn) in a respirometer – extension of the method according to DIN EN 1899-2 (H55)” as a proposal for a German standard method in the 46th installment 2000 of the DEV. Criticisms of the conventional manometric measuring systems have mainly concerned the use of mercury for measuring the pressure. Mercury is toxic and if not handled properly it produces vapors which are injurious to health. With the development of the OxiTop® systems, WTW has fulfilled a worldwide customer wish – mercury-free BOD determinations. With OxiTop® WTW now offers a unique and modular mercury-free BOD instrument system which has been developed for daily practical use. OxiTop® alters the previous handling process in a revolutionary manner.

• OxiTop® IS 6, IS 12
  • OxiTop® IS 6 : Ready for use with 6 measuring places
  • OxiTop® IS 12-6 : Ready for use with 6 measuring places, extendable to 12 places
  • OxiTop® IS 12 : Ready for use with 12 measuring places
• OxiTop® closely observed : Correct measurement should Pressure sensor, microcontroller, timer, memory

OxiTop® Control

• OxiTop® Control 6 : Ready for use with 6 measuring places
• OxiTop® Control 12 : Ready for use with 12 measuring places

Thermostats

• OxiTop® Box : Is a benchtop model with hinged clear-view cover which can accommodate a maximum of either 12 OxiTop® measuring places or 20 Karlsruhe bottles. The chamber is equipped with a connection for an IS 6 or IS 12 stirrer. A special compartment is provided for thermostatting 6 methylene blue samples. The box is made of non-corrosive materials and the compressor is CFC-free. A cross-flow fan ensures uniform temperature distribution. The box has an automatic defrosting system with condensate evaporation.

• Thermostat Cabinets : BOD5 values must be determined at a constant temperature of 20 °C. If this requirement cannot be realized at the workplace then a thermostat cabinet in which the samples can be placed for the duration of the test is required. As the samples must be additionally stirred the thermostat cabinets are fitted with internal sockets to provide the stirrers with electricity. Depending on the thermostat cabinet size up to 48 samples can be thermostatted simultaneously. Sizes /2 and /4 are available with transparent insulating glass doors. Alternatively all thermostat cabinets can be provided with a variable temperature controller, range +5 ... +40 °C.

• Portable Turbidity Meter 
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• Battery-operated portable turbidity meter with infrared LED (860 nm) for measurements according to ISO 7027 / DIN/EN 27 027 (EN ISO 7027) on a nephelometric basis and with a range of 0 to 1100 NTU. The AutoRange function switches the measuring range automatically. The 1 to 4-point calibration is very convenient for the operator. Pressing the CAL key switches the instrument to the calibration mode. The calibration standards then only need to be inserted one after the other in a falling sequence. The instrument is powered by 4 micro (AAA) alkaline manganese batteries which are supplied with the instrument as are all the other necessary accessories such as calibration standards (0.02 – 10.0 – 100 and 1000 NTU) and empty cuvettes.

• Laboratory Turbidity Meters
  • Turb 550 / Turb 550 IR : Laboratory turbidity meters for nephelometric measurements with automatic 3-point calibration, RS 232 output, builtin real-time clock and calibration interval monitoring. Measuring range selection from 0.01 ... 1000 NTU is carried out automatically and for comparative measurements the current and previous values can be shown on the 2-line display. Scope of supply: instrument with integral short operating instructions, accessory case with 2 empty cuvettes, 3 secondary standards (0.02 – 10.0 – 1000 NTU) and cuvettes cleaning tissue.
  • Turb 555 / Turb 555 IR : High-precision laboratory turbidity meters with a wide measuring range of 0.0001 to 10000 NTU for all turbidity measuring applications from ultrapure and drinking water measurements, through quality assurance in the soft drinks industry up to checking wastewater. The measuring system with its 4 detectors allows not only nephelometric (90° scatter) measurements and transmission measurements, but also ratio measurements in which the influences of stray light and sample color are reduced. The possibility of displaying the values in EBC units (European Brewing Convention) means that they are suitable for use in the brewing industry. The measurements are shown on an illuminated display to ensure good readability from almost any angle. The resolution of the measurement can be chosen to suit the particular application. The menu-guided operator interface easily guides the operator through the measuring, calibration and configuration procedures. Comprehensive AQA functions such as monitoring the calibration interval or password protection for calibration and setup access help to assure the quality of the measurements and are all also included in the documentation of the measurements.

Photometry

• PhotoLab® S6 : The PhotoLab® S6 has been specially developed for comfortable and simple routine measurements in production plants and for self-checking purposes in wastewater analyses in particular. The newly developed optical system has no mechanical wear as it has no moving parts and is supported by stateof- the-art electronics. When the cover is opened the instrument switches on and checks the optical system itself. The cover protects the instrument when not in use and holds frequentlyneeded short-form analytical procedures. The large well-laid-out graphics display shows the reading unambiguously and provides operating instructions at the ame time. For routine use with coded cuvettes the AutoSelect function selects all the data which are important for the measurement. The 4 proven silicone function keys are only required for repeat measurements, absorbency measurements and operatorspecific alterations to the basic settings as well as for uncoded round cuvettes. The AQA function supports the operator in combination with the AQA chip in checking the measuring system.
• PhotoLab® 12 : The PhotoLab® S 12 has been developed for the complete range - from Al for aluminium to Zn for zinc - of reagents offered and supported by WTW. 10 additional self-defined methods can be programmed and permanently stored. The newly developed optical system has no mechanical wear as it has no moving parts and is supported by state-of-theart electronics. When the cover is opened the instrument switches on and checks the optical system itself. The cover protects the instrument when not in use and holds frequentlyneeded short-form analytical procedures. The large well-laid-out graphics display shows the reading unambiguously and also provides operating instructions at the same time. For routine use with coded cuvettes the AutoSelect function selects all the data which are important for the measurement. The AQA function supports the operator in combination with the AQA chip in checking the measuring system. The reagent tests contain an AutoSelector which is inserted in the round cuvette compartment. In this way the more inexpensive tests can also be measured comfortably. The 4 proven silicone function keys are only required for repeat measurements, absorbency measurements and operatorspecific alterations to the basic settings as well as for uncoded round cuvettes.
• PhotoLab® Spektral : The PhotoLab® Spektral is a spectrophotometer continuously adjustable in the range 330 ... 850 nm, and:
  • Offers comfortable routine measurements for the complete range - from Al for aluminium to Zn for zinc - of test sets offered and supported by WTW.
  • In addition the high-quality optics module means that it can bear comparison to top-quality spectrophotometers
  • 100 additional self-defined methods can be programmed and permanently stored.
  • Suitable for DIN measurements as well as measuring turbidities and coloration
  • The AQA function supports the operator in combination with the AQA chip in checking the measuring system.

Thermoreactors

Thermoreactors, also known as dry thermostats, are necessary for carrying out chemical digestions, e.g. for COD, total nitrogen, total phosphorus. They ensure that the digestion is carried out completely, as they maintain the necessary high reaction temperature throughout the whole of the defined period. In each of the new thermoreactors the most important temperatures and digestion times used in wastewater analysis are stored in easily selected digestion programs, such as the COD digestion at 148 °C for 2 h. In addition, you can program the CR 3200 and the CR 4200 to carry out your own individual digestions at other temperatures. For simultaneous digestions, such as for COD (148 °C) and total-N (120 °C), the CR 4200 is suited as the two thermoblocks can be controlled separately.

• CR 2200 : The CR 2200 is the routine instrument for the digestion reactions required for the analysis of wastewater. All programs can easily be selected. A well-designed heating system means that the stability and accuracy of the set temperature are outstanding.
• CR 3200 : The CR 3200 is the thermoreactor for a wide range of applications. Numerous determinations can be carried out in its 24 openings. The CR 3200 also impresses with the stability and accuracy of the set temperature thanks to the well-designed heating system. The temperature can be freely selected in 1 °C steps between room temperature (25 °C) and 170 °C. As you can enter 8 of your own temperature programs this means, for example, that you can store a similar program to the short-time COD determination (DIN 38 409 H43) with a 15 minute digestion at 148 °C as your own program. Test agent monitoring is possible with the CR 3200 by using the TFK CR Thermosensor (recommended accessory).
• CR 4200 : The CR 4200 is ideally suited if different digestions have to be carried out simultaneously as the heating blocks can be controlled separately. For example, one heating block with 12 cuvettes can be used to carry out a COD digestion at 148 °C while the other one is carrying out the total-N digestion at 120 °C with a further 12 cuvettes. The CR 4200 also impresses with the stability and accuracy of the set temperatures, even when the blocks are be used at different temperatures, thanks to the well-designed heating system. The temperature can be freely selected in 1 °C steps between room temperature (25 °C) and 170 °C. As you can enter 8 of your own temperature programs this means, for example, hat you can store a similar program to the short-time COD determination (DIN 38 409 H43) with a 15 minute digestion at 148 °C as your own program. Quality assurance is possible with the CR 4200 by using the TFK CR Thermosensor (recommended accessory).