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Portable colorimeter pHotoFlex® pH

WTW portable photometer pHotoFlex® pH

pHotoFlex® pH: portable LED photometer combined with full value pH measurement for environmental monitoring, fish hatcheries, extensive routine and water analytics

  • Versatile with special methods NH3 and CO2
  • Electro-chemical pH and ORP measurement with automatic temperature compensation (ATC)
  • Special methods for ammonium and carbon dioxide

With its unique multi-parameter function of photometry and electro-chemical pH measurement, pHotoFlex® pH shows its strength with more complex tasks in environmental management, such as water framework guidelines, during process monitoring with changing sites and for fish hatcheries by determining NH3 and CO2:

The energy-efficient LED optics with 6 wavelengths and a captive adapter for versatile applications with 16 and 28 cuvettes allows the measurement of the smallest concentrations with more than 180 programs for standard parameters and coloration. With a multitude of available test kits - from lot-certified cuvettes to economic powder reagents, it is suitable for monitoring by health offices via environmental monitoring all the way to service labs. A list of favorites for the most commonly used tests, sample ID numbers and more than 3,000 measurements per battery set facilitate field measurements.

The integrated pH function is a complete electro-chemical pH measurement of pH 0-16 with automatic buffer recognition (TEC/NIST) by using the comprehensive WTW selection of pH measuring chains. The temperature compensation automatically takes place in the admissible measuring ranges from -5 … 100 °C. The WTW MultiCal® routine allows the automatic calibration with up to 3 calibration points. For field use, there is, for instance, the maintenance-free SenTix® 41 is recommended, for precision measurements in the lab, the glass electrode SenTix® 81 is frequently used.

The optional PC software LSdata offers GLP-compliant data evaluation with data filter and allows the input of up to 100 user-defined programs, automatically calculate these as methods and save them to the pHotoFlex®. For the convenient use in the field, there is a case set available, including the pH probe SenTix® 41 as a mobile lab with work surface and storage compartment as well as a lot of accessories, such as pH standards, tripod, pipettes and replacement batteries. For lab use, the photometer can be used in conjunction with a LabStation (optional) with site-supplied power and fitted with an external barcode reader.


Model Description Order no.
pHotoFlex® pH Portable LED photometer with 6 wavelengths for 16 and 28 mm cuvettes 251100
pHotoFlex® pH/SET Like the single unit, but in the field case with table insert, PC software LSdata, cable and accessories 251200

Technical Data

Light soruce LED
Wavelength nm 436, 517, 557, 594, 610, 690
Own methods 100
Data memory 1000 measurements
pH/ORP pH 0-16 with automatic temperature control (ATC)
Accuracy Photometry: <2 nm wavelength accuracy, 0.005 abs. reproducibility
pH: ±0.01 pH


Model Description Order no.
LSdata Flex/430 PC software for GLP-compliant data management and programming of you own methods 902762
LS Flex/430 LabStation for the easy operation and evaluation in the lab, with PC software LSdata for GLP-compliant data evaluation, zero modem cable, battery and universal power supply, RS232 interface for the use of a barcode reader 251301
RB Flex/430 Battery with universal power plug 251300
FC pHotoFlex®/Turb® 430 Field case with table insert for device, tripod and cuvettes for convenient work in the field. Additionally: Pipette holder and storage compartment for utensils, empty 251304
LK28-Set 12 spare cuvettes, round, 28 x 60 mm 251302
RK 14/25 25 round cuvettes 16 outer diameter, empty 250621


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Basics and principles for water, routine and general analysis – we share our know how: 

WTW Photometry Compendium in cooperation with the G.I.T. Laboratory Journal

in cooperation with the G.I.T. Laboratory Journal.

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