Lovibond® MD640 Photometer, with PTSA

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Specifications:

Application	Water Quality Analysis, Spectrophotometry	Warranty	1 Year
Storage Temperature	Ambient
Product Type	Photometer
Product Brand	Lovibond
Product Grade	Analytical grade

Overview
Resource

The Lovibond® MD640 Photometer is a robust, portable multiparameter colorimeter and fluorometer designed for demanding industrial water treatment applications. Uniquely combining colorimetric and fluorescent testing capabilities in one device, the MD640 allows users to measure both conventional parameters and key fluorescent tracers such as PTSA and Fluorescein, eliminating the need to carry two separate instruments.

With Bluetooth® connectivity and seamless integration with the Lovibond® AquaLX mobile app, the MD640 simplifies data management and field reporting, enabling quick export of results to Excel or .txt files—no subscription or proprietary software required.

This instrument supports over 100 pre-programmed test methods, features user-defined calibration curves, and includes on-screen method guidance for accurate and convenient analysis, making it an indispensable tool for both field and bench use in water quality management.

Key Features

✅ Dual Functionality: Measures colorimetric parameters and fluorescent tracers (PTSA, Fluorescein)
✅ Mobile App Integration: Transfer data via Bluetooth® to the free AquaLX app
✅ Extensive Test Library: 120+ pre-programmed colorimetric tests across various reagent formats
✅ User-Friendly Interface: Scrollable menus with a customizable “Favorites” list—no need to memorize method numbers
✅ Data Management: Stores up to 1,000 readings with date, time, and location ID
✅ Flexible Calibration: Create and store up to 35 custom methods with polynomial fits and defined reporting units
✅ Accurate Optical System: LED-based photometry with six interference filter wavelengths for reliable, repeatable results
✅ One-Time Zero Function: Zero once per sample for faster sequential testing

Technical Specifications

Parameter	Specification
Optics	LEDs with interference filters (430, 530, 560, 580, 610, 660 nm)
Wavelength Accuracy	± 1 nm
Supported Cuvettes	10 mm multi-vial, 13 mm, 16 mm, 24 mm round cuvettes
Display	Graphic display
Interfaces	Bluetooth®
User Interface Languages	English, German, Spanish, French, Italian, Portuguese, Polish, Indonesian
Software Updates	Via Internet
Data Storage	Approx. 1,000 readings (with ID, date, time)
Battery Life	Approx. 26 hours
Keyboard	Acid- and solvent-resistant, touch-sensitive with beeper
Portability	Handheld/Benchtop hybrid
Compliance	CE
Dimensions	3.74 x 1.77 x 8.27 inches

Applications

✅ Boiler Water & Cooling Water Monitoring
✅ Disinfection & Chlorination Control
✅ Drinking Water & Wastewater Treatment
✅ Food & Beverage Quality Control
✅ Pool Water Management
✅ Galvanization and Industrial Water Systems
✅ Raw Water Intake Analysis

Reagent Compatibility

Compatible with tablet, powder pack, and liquid reagents
Supports PTSA and Fluorescein fluorescence detection
Free updates for additional test parameters via online firmware upgrades

The Lovibond® MD640 Photometer with PTSA is the ultimate portable solution for water quality professionals who need a single device capable of conducting colorimetric and fluorescent analyses across a broad range of parameters. Rugged, accurate, and connected, it ensures compliance, precision, and efficiency in every environment—from lab to field.

Range

Testparameter	Measuring Range	Method No.	Chemical Method
Alkalinity-m HR T	5 - 500 mg/L CaCO3	M31	Acid / Indicator
Alkalinity-m T	5 - 200 mg/L CaCO3	M30	Acid / Indicator
Alkalinity-p T	5 - 500 mg/L CaCO3	M35	Acid / Indicator
Aluminium PP	0.01 - 0.25 mg/L Al	M50	Eriochrom Cyanine R
Aluminium T	0.01 - 0.3 mg/L Al	M40	Eriochrom Cyanine R
Ammonia HR TT	1.0 - 50 mg/L N	M66	Salicylate
Ammonia LR TT	0.02 - 2.5 mg/L N	M65	Salicylate
Ammonia PP	0.01 - 0.8 mg/L N	M62	Salicylate
Ammonia T	0.02 - 1 mg/L N	M60	Indophenole Blue
Bromine PP	0.05 - 4.5 mg/L Br2	M81	DPD
Bromine T	0.05 - 13 mg/L Br2	M80	DPD
Chloramine (M) PP	0.02 - 4.5	M63	Indophenole method
Chloride L (B)	0.5 - 20 mg/L Cl-	M92	Mercury Thiocyanate / Iron Nitrate
Chloride T	0.5 - 25 mg/L Cl-	M90	Silver Nitrate / Turbidity
Chlorine (free) and Monochloramine	0.02 - 4.50 mg/L Cl2	M64	Indophenole method
Chlorine dioxide PP	0.04 - 3.8 mg/L ClO2	M122	DPD
Chlorine dioxide T	0.02 - 11 mg/L ClO2	M120	DPD / Glycine
Chlorine HR 2 PP	0.1 - 10 mg/L Cl2	M112	DPD
Chlorine HR (KI) T	5 - 200 mg/L Cl2	M105	KI / Acid
Chlorine HR PP	0.1 - 8 mg/L Cl2	M111	DPD
Chlorine HR T	0.1 - 10 mg/L Cl2	M103	DPD
Chlorine L	0.02 - 4.0 mg/L Cl2	M101	DPD
Chlorine MR PP	0.02 - 3.5 mg/L Cl2	M113	DPD
Chlorine PP	0.02 - 2 mg/L Cl2	M110	DPD
Chlorine T	0.01 - 6.0 mg/L Cl2	M100	DPD
Chromium PP	0.02 - 2 mg/L Cr	M125	Diphenylcarbazide
COD HR TT	200 - 15000 mg/L COD	M132	Dichromate / H2SO4
COD LMR TT	15 - 300 mg/L COD	M133	Dichromate / H2SO4
COD LR TT	3 - 150 mg/L COD	M130	Dichromate / H2SO4
COD MR TT	20 - 1500 mg/L COD	M131	Dichromate / H2SO4
Copper L	0.05 - 4 mg/L Cu	M151	Bicinchoninate
Copper PP	0.05 - 5 mg/L Cu	M153	Bicinchoninate
Copper T	0.05 - 5 mg/L Cu	M150	Biquinoline
Cyanide L	0.01 - 0.5 mg/L CN-	M157	Pyridine-barbituric Acid
CyA T	10 - 160 mg/L CyA	M160	Melamine
DEHA PP	0.02 - 0.5 mg/L DEHA	M167	PPST
DEHA T (L)	0.02 - 0.5 mg/L DEHA	M165	PPST
Fluorescein 2P	10 - 300 ppb	M511	Fluorescence
Fluorescein	10 - 400 ppb	M510	Fluorescence
Fluoride 2 L	0.1 - 2 mg/L F-	M172	SPADNS
Fluoride L	0.05 - 2 mg/L F-	M170	SPADNS
H2O2 HR L	40 - 500 mg/L H2O2	M214	Titanium Tetrachloride / Acid
H2O2 LR L	1 - 50 mg/L H2O2	M213	Titanium Tetrachloride / Acid
H2O2 T	0.03 - 3 mg/L H2O2	M210	DPD / Catalyst
Hardness Ca and Mg L	0.05 - 4 mg/L CaCO3	M199	Calmagite
Hardness Ca and Mg MR TT	10 - 360 mg/L CaCO3	M198	Calmagite
Hardness Calcium (B) T	20 - 500 mg/L CaCO3	M191	Murexide
Hardness Calcium (B) T	50 - 900 mg/L CaCO3	M190	Murexide
Hardness total HR T	20 - 500 mg/L CaCO3	M201	Metallphthaleine
Hardness total T	2 - 50 mg/L CaCO3	M200	Metallphthaleine
Hazen 24	10 - 500 mg/L Pt	M204	(APHA) Platinum Cobalt Standard Method
Hydrazine L	0.01 - 0.6 mg/L N2H4	M206	Dimethylaminobenzaldehyde
Hydrazine P	0.05 - 0.5 mg/L N2H4	M205	Dimethylaminobenzaldehyde
Hypochlorite T	0.2 - 16 % NaOCl	M212	Potassium Iodide
Iron (TPTZ) PP	0.02 - 1.8 mg/L Fe	M223	TPTZ
Iron HR L	0.1 - 10 mg/L Fe	M227	Thioglycolate
Iron in Mo PP (224)	0.01 - 1.8 mg/L Fe	M224	TPTZ
Iron LR L (A)	0.03 - 2 mg/L Fe	M225	Ferrozine / Thioglycolate
Iron LR L (B)	0.03 - 2 mg/L Fe	M226	Ferrozine / Thioglycolate
Iron PP	0.02 - 3 mg/L Fe	M222	1,10-Phenanthroline
Iron T	0.02 - 1 mg/L Fe	M220	Ferrozine / Thioglycolate
KS4.3 T	0.1 - 4 mmol/L KS4.3	M20	Acid / Indicator
lodine T	0.05 - 3.6 mg/L I	M215	DPD
Manganese HR PP	0.1 - 18 mg/L Mn	M243	Periodate Oxidation
Manganese L	0.05 - 5 mg/L Mn	M245	Formaldoxime
Manganese LR PP	0.01 - 0.7 mg/L Mn	M242	PAN
Manganese T	0.2 - 4 mg/L Mn	M240	Formaldoxime
Molybdate HR L	1 - 100 mg/L MoO4	M254	Thioglycolate
Molybdate HR PP	0.3 - 40 mg/L Mo	M252	Mercaptoacetic Acid
Molybdate LR PP	0.03 - 3 mg/L Mo	M251	Ternary Complex
Molybdate T	1 - 50 mg/L MoO4	M250	Thioglycolate
Nickel L	0.2 - 7 mg/L Ni	M256	Dimethylglyoxime
Nitrate MR PP	1 - 30 mg/L NO3-N	M261	Zinc Reduction
Nitrate T	0.08 - 1 mg/L N	M260	Zinc Reduction / NED
Nitrate TT	1 - 30 mg/L N	M265	Chromotropic Acid
Nitrite HR PP	2 - 250 mg/L NO2 -	M273	Ferrous Sulfate Method
Nitrite HR TT	0.3 - 3 mg/L N	M276	Sulfanilic / Naphthylamine
Nitrite LR TT	0.03 - 0.6 mg/L N	M275	Sulfanilic / Naphthylamine
Nitrite PP	0.01 - 0.3 mg/L N	M272	Diazotation
Nitrite T	0.01 - 0.5 mg/L N	M270	N-(1-Naphthyl)-ethylendiamine
Nitrite VHR L	25 - 2500 mg/L NO2 -	M271	Ferrous Sulfate Method
Oxygen active T	0.1 - 10 mg/L O2	M290	DPD
Oxygen dissolved C	10 - 800 µg/L O2	M292	Rhodazine D TM
Ozone PP	0.015 - 1.2 mg/L O3	M301	DPD / Glycine
Ozone T	0.02 - 2 mg/L O3	M300	DPD / Glycine
Phenol T	0.1 - 5 mg/L C6H5OH	M315	4-Aminoantipyrine
PHMB T	2 - 60 mg/L PHMB	M70	Buffer / Indicator
Phosphate h. TT	0.02 - 1.6 mg/L P	M325	Phosphomolybdenum Blue
Phosphate HR C	1.6 - 13 mg/L P	M327	Vanadomolybdate
Phosphate HR L	5 - 80 mg/L PO4	M335	Vanadomolybdate
Phosphate HR T	0.33 - 26 mg/L P	M321	Vanadomolybdate
Phosphate HR TT	1 - 20 mg/L P	M322	Vanadomolybdate
Phosphate LR C	0.02 - 1.6 mg/L P	M328	Stannous Chloride
Phosphate LR L	0.1 - 10 mg/L PO4	M334	Phosphomolybic Acid / Ascorbic Acid
Phosphate LR T	0.02 - 1.3 mg/L P	M320	Phosphomolybdenum Blue
Phosphate PP	0.02 - 0.8 mg/L P	M323	Phosphomolybdenum Blue
Phosphate t. TT	0.02 - 1.1 mg/L P	M326	Phosphomolybdenum Blue
Phosphate TT	0.02 - 1.63 mg/L P	M324	Phosphomolybdenum Blue
Phosphonate PP	0.02 - 125 mg/L PO4	M316	Persulfate UV Oxidation Method
pH-value HR T	8.0 - 9.6 pH	M332	Thymol Blue
pH value L	6.5 - 8.4 pH	M331	Phenol Red
pH-value LR T	5.2 - 6.8 pH	M329	Bromocresolpurple
pH-value T	6.5 - 8.4 pH	M330	Phenol Red
Polyacrylate L	1 - 30 mg/L Polyacryl	M338	Turbidity
Potassium T	0.7 - 16 mg/L K	M340	Tetraphenylborat Turbidity
PTSA	10 - 400 ppb	M501	Fluorescence
PTSA	10 - 1000 ppb	M500	Fluorescence
Silicate HR PP	1 - 90 mg/L SiO2	M352	Silicomolybdate
Silicate L	0.1 - 8 mg/L SiO2	M353	Heteropolyblue
Silicate LR PP	0.1 - 1.6 mg/L SiO2	M351	Heteropolyblue
Silicate T	0.05 - 4 mg/L SiO2	M350	Silicomolybdenum Blue
Sulphate HR PP	50 - 1000	M361	Bariumsulphate Turbidity
Sulphate PP	5 - 100 mg/L SO4 2-	M360	Bariumsulphate Turbidity
Sulphate T	5 - 100 mg/L SO4 2-	M355	Bariumsulphate Turbidity
Sulphide L	15 - 1400 mg/L S2-	M366	Methylene Blue
Sulphide T	0.04 - 0.5 mg/L S2-	M365	DPD / Catalyst
Sulphite T	0.1 - 5 mg/L SO3	M370	DTNB
Surfactants M. (anion.) TT	0.05 - 2 mg/L SDSA	M376	Methylene Blue
Surfactants M. (cation.) TT	0.05 - 1.5 mg/L CTAB	M378	Disulphine Blue
Surfactants M. (not ionic) TT	0.1 - 7.5 mg/L Triton X-100	M377	TBPE
Suspended solids 24	10 - 750 mg/L TSS	M384	Turbidity / Attenuated Radiation Method
Tannin L	0.5 - 20 mg/L Tannin	M389
TN HR TT	5 - 150 mg/L N	M281	Persulphate Digestion
TN LR TT	0.5 - 25 mg/L N	M280	Persulphate Digestion
TOC HR M. TT	50 - 800 mg/L TOC	M381	H2SO4 / Persulphate / Indicator
TOC LR M. TT	5 - 80 mg/L TOC	M380	H2SO4 / Persulphate / Indicator
Triazole PP	1 - 16 mg/L Benzotriazole or Tolyltriazole	M388	Catalyzed UV Digestion
Turbidity 24	10 - 1000 FAU	M386	Attenuated Radiation Method
Urea T	0.1 - 2.5 mg/L Urea	M390	Indophenol / Urease
Zinc L	0.1 - 2.5 mg/L Zn	M405	Zincon / EDTA
Zinc T	0.02 - 1 mg/L Zn	M400	Zincon