Lovibond® MD 640 Photometer / Fluorometer – Industrial Water Systems


New Innovation! The MD 640 follows on from the popular Lovibond® MD600 photometer with the expanded capacity of fluorescence.

The Lovibond® MD 640 combines a portable photometer (that measures 120+ of the important parameters of water analysis, from Aluminium to Zinc) with a fluorometer (measures PTSA and fluorescein in water).

PTSA (1, 3, 6, 8 pyrenetetrasulfonic acid, sodium salt) and fluorescein are fluorescent substances that are increasingly being added to industrial water treatment systems as tracer additives, in order to maintain the correct dosage of treatment chemicals in real time.

Symptoms of incorrect chemical dosage

You can be assured of accuracy and reliability with Lovibond®, a leading water analysis company, with 130+ years experience in the field of water testing.

Major Benefit:

If you are involved in industrial water analysis, this single, portable, electronic device will allow you to test for just a few parameters / substances, or many, as your water testing programme may develop and change over time.


  • Industrial water


  • Built in UV excitation LED enables accurate detection and quantification of PTSA in the range of 0 to 1 000 ppb
  • Measures fluorescein in the range of 0 to 400 μg / l
  • No additional accessories or chemical reagents are required for the PTSA and fluorescein tests – it’s as easy as inserting the sample and reading the digital result
  • Accurate and repeatable results
  • Measurement of PTSA and fluorescein helps you to increase the efficiency of your water system, reduce corrosion and the amount of water treatment chemicals used
  • Robust and waterproof
  • Pre-programmed with 120+ analytical methods for quantification of substances – such as chlorine, COD, molybdate and phosphonates
  • See more benefits of the MD 600 photometer


Two years.

Display Backlit graphic display
Interfaces Bluetooth 4.0
RJ45 socket for internet updates
Optics LED’s, interference filters (IF) and photo sensor in transparent cell chamber.
Wavelength specifications of interference filters:
430 nm IF delta wavelength = 5nm
530 nm IF delta wavelength = 5nm
560 nm IF delta wavelength = 5nm
580 nm IF delta wavelength = 5nm
610 nm IF delta wavelength = 6nm
660 nm IF delta wavelength = 5nm
approx. 1 nm
2% Full scale (T = 20 degrees C – 25 degrees C)
0.005 A
Operation Acid and solvent resistant, touch sensitive keypad with
audible feedback via integrated beeper
Power Supply 4 batteries (Mignon AA / LF6)
Operation time: approx. 26 hours continuous or 3 500 tests
Auto off approx. 20 minutes after last key press with audible signal
Dimensions approx. 210 x 95 x 45 mm unit
approx. 395 x 295 x 106 mm case
Weight (unit) approx 450 g
Ambient Conditions 5 – 40 degrees C, max 30 – 90% rel. moisture
Language Selection German, English, French, Spanish, Italian, Portuguese, Polish,
additional languages via internet update
Memory Capacity approx. 500 data sets
Conformity CE
  • MD 640 instrument in carrying case
  • 4 batteries
  • 3 round vials, each 24 and 16 mm in diameter
  • 1 adapter each for 16 mm and 13 mm vials
  • plastic stirring rod 13 cm
  • brush 11 cm
  • syringe 5 ml
  • screwdriver
  • Certificate of Compliance
  • Instruction Manual
  • but without reagents

Please specify the reagents or parameters required at time of order, so that we can quote accordingly.

List of Reagents for Photometers and Spectrophotometers


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