DR3900 Benchtop VIS Spectrophotometer

Expert water analysis made simple.

Hach is committed to understanding your measurement needs in order to provide you and your lab with the right solution.

How do you currently ensure the accuracy of your current measurements? Are your laboratory testing procedures optimised to save time and ensure accuracy?

The DR3900 is designed to deliver accurate results quickly with Hach’s innovative TNTplus and LCK reagents, which are optimised around:
• Sample preparation: reduced handling steps, precise dosing
• Sample analysis: automatic test recognition, expiration date check, etc.
• Utilisation of the new Truecal software to eliminate lot to lot variation
• Documentation of results: versatile data management

The DR3900 is a benchtop visible spectrum (320 – 1100 nm), split beam spectrophotometer with over 220 pre-programmed methods optimised for laboratory water analysis. With your daily routine of water analysis in mind, the DR3900 spectrophotometer is optimised for safe processes and accurate results. Control-parameters like Ammonium, COD, Phosphate, Nitrate and many others are easy to perform. The handling of tests and spectrophotometer is well designed to avoid any errors in your water analysis.

This instrument connects to Claros, Hach’s innovative Water Intelligence System, enabling you to seamlessly connect and manage instruments, data, and process – anywhere, anytime. The result is greater confidence in your data and improved efficiency in your operations. To unlock the full potential of Claros, insist on Claros Enabled instruments.


Simple Preparation

TNTplus vials use Dosicaps – freeze-dried reagents integrated into sealed cap – that are easier to use than Powder Pillows or Liquid Reagents, without any risk of contamination.
The boxes and vials are color-coded for a fast and easy parameter and range recognition of exactly the test you need.
Step-by-step illustrated test methods are printed on the box as a quick reference and can also be called up in the instrument menu.

Comprehensive Documentation

Measurement results are documented on the detailed level with timestamp, operator ID, absorbance reading, and calculated concentration. The 2D barcode delivers the lot number and expiry date, logged with every result.
For your accreditation the certificate of analysis can be called up just by wiping the reagent box towards the RFID* sensor.

*RFID technology currently available in US, Canada, Puerto Rico, Australia, New Zealand, and Colombia only.

Fast execution

A 2D barcode on the TNTplus vial is automatically read by the Hach DR spectrophotometer to identify the appropriate method and take the measurement. The vial spins to take 10-fold absorbance readings that will be averaged for result determination to exclude scratches and fingerprints. Instrument calibration verification and high instrument stability all combine to eliminate the need to run reagent blanks.


With the ability to store hundreds of user-determined methods, operators are able to tailor the DR3900 to meet the everyday needs of the plant.
Being able to optimise and customise the method portfolio, combined with regular software updates and Claros connectivity, makes the DR3900 the ultimate solution to water quality lab needs.

Beam Height 10 mm
Data Logger 2000 measured values (Result, Date, Time, Sample ID, User ID)
Display 7″ TFT
Display Resolution WVGA (800 pix x 480 pix)
Display Size 7 inch (17.8 cm)
Display Type Colored touch-screen
Enclosure Rating IP30
Includes Adapter “A” for 1″ round + Accuvac/1 cm rectangular cuvettes, manual in m 5 languages (GB, D, F, I, E), power supply 100 – 240V, 47 – 63Hz
USB type A (2)
USB type B
RFID module
Light source Gas-filled Tungsten (visible)
Manual Languages English
French (CDN)
Spanish (SA)
Portuguese (BR)
Max. operating humidity 80 %
Max. Storage Humidity 80 %
Operating Conditions 10 – 40 °C
Operating Mode Transmittance (%), Absorbance and Concentration, Scanning
Optical System Reference beam, spectral
Photometric Accuracy 5 mAbs @ 0.0 – 0.5 Abs
Photometric Accuracy 2 1 % at 0.50 – 2.0 Abs
Photometric Linearity < 0.5 % – 2 Abs
Photometric Linearity 2 ≤ 0.01 % at >2 Abs with neutral glass at 546 nm
Photometric Measuring Range ± 3.0 Abs (wavelength range 340 – 900 nm)
Power Requirements With external power supply
Power requirements (Hz) 50/60 Hz
Power requirements (Voltage) 110 – 240 V AC
Power Supply Benchtop Power Supply
Preprogrammed Methods > 240
Region US
Sample Cell Compatibility 13 mm round, 16 mm round, 1 cm & 5 cm rectangular, 1″ round, 1″ rectangular
Scanning Speed > 8 nm/S (in steps of 1 nm)
Source Lamp Gas-filled Tungsten (visible)
Specific Technology RFID for easy method update, sample ID and Certificate of Analysis
Spectral Bandwidth 5 nm ± 1 nm
Standard accessories: None
Storage conditions -30 – 60 °C
Stray Light < 0.1 % T at 340 nm with NaNO2
User Interface Languages Bulgarian, Chinese, Croatian, Czech, Danish, Dutch, English, Finnish, French, German, Greek, Hungarian, Italian, Japanese, Korean, Polish, Portuguese – Brazil, Portuguese, Russian, Serbian, Slovakian, Slowenian, Spanish, Swedish, Turkish
User Programs 100
Warranty 12 months
Wavelength Accuracy ± 1.5 nm (wavelength range 340 – 900 nm)
Wavelength Calibration Automatic
Wavelength Range 320 – 1100 nm
Wavelength Reproducibility ± 0.1 nm
Wavelength Resolution 1 nm
Wavelength Selection Automatic, based on method selection
Weight 4.2 kg
What’s included? Includes: Adapter A for 1 in. round and 1 cm square cells, matched pair of 1 in. square glass sample cells, light shield, dust cover, printed basic user manual and benchtop power supply with 115 and 230V power cords.





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