Orion AQ3700 Portable Colorimeter

  • Warranty Covered by 2 year warranty
  • Range Of Preprogrammed Methods Many new parameters and test ranges for all testing needs
  • Waterproof Waterproof casing with IP67 rating
  • Ideal for Total Phosphate & Total Nitrogen
Product Options


The Orion AQ3700 portable colorimeter offers many new parameters and test ranges, all the user needs to do is select the parameter needed to measure, then the measurement range. The Orion AQ3700 benefits are highlighted in treating and monitoring effluent. By optimizing the process in wastewater treatment dirty water is moved to the next stage of process at the correct time not prior to being fully treated or over treated. Therefore not wasting chemicals and slowing down the process which requires more energy to maintain the process which is caused by over treating. Or in contrast under treating can cause problems if the discharge exceeds the permitted levels.

Historically total nitrogen and total phosphate testing has been a very long and timely reflux digestion process with expensive glassware. Results can now be produced in around an hour using persulfate digestion tube methods. Therefore, the in-process checks of the nutrient removal status ensures the user can monitor the removal status to check the final levels required are attained aswell as give advance warning if corrections to the process are required. The Orion AQ3700 portable colorimeter and its many options testing for various nitrogen and phosphate forms enables the harmful effects of algae blooms and ecosystems disruption to be reduced.

Total Nitrogen and Total Phosphate Tube Digestion tests are now available from Thermo Scientific using the AQ3700 meter. If you are already testing COD levels, you can quickly add these important tests and start reaping the benefits!

Our EPA approved methods for Drinking Water and Wastewater are noted. Additionally there are other Orion methods that use EPA-approved test methodology and are acceptable for EPA reporting. These are noted as EPA Equivalent for the sample type. The preprogrammed tests make the AQ3700 portable pocket colorimeter easy to get quick, accurate results.

Manufactured by: Thermo Scientific
Model: Orion AQ3700 Portable Colorimeter

Services offered for this product

  • Sales
  • Rental
  • Installation
  • Calibration
  • Maintenance


Drinking water
Nutrient monitoring
Environmental testing
Food and beverage
Industrial applications


AQ3700 Meter Specifications
Incident Light Source 6 Light Emitting Diodes (LEDs)
LED Wavelengths 430, 530, 560, 580, 610, 660 nm
Photometric Accuracy 2% full scale as
measured with standard solutions
Photometric Resolution +/- 0.005 Abs
New Method Upload Capability Yes, via internal RJ45 port
Output IRDA (order IRIM adapter AQ37IRIM separately
User Interface
Display Graphic display
Backlit Yes
Inputs 15 button keypad
Key Functions Numeric keys, On/Off, Up, Down,
Enter, Timer, Zero, Test, Cal, Mode, Store, Shift, plus 3 Function keys
Test Methods Preprogrammed with user prompts
and feedback, user's favourite's list, 10 user defined method locations
Automatic Range Selection Yes
Blank Capacity Per method
Datalog Points Up to 1000, time and date stamp
Test Reagent Formats Powder, tablet, liquid, reagent tubes, digestion tubes. Color, Turbidity and
Suspended Solids tests do not require reagents
User Interface (continued)
Sample Required 10mL
Sample Cells 24mm and 13mm diameter vials
and 16mm tubes
Software Languages English, French, German, Spanish, Italian
Auto Shut Down 20 min after last key-press, wakes to last location
Field Case 17 in W x 13 in L x 6 in H black case,
molded and foam to secure meter, sample cells,
adapters, stir rod, brush and enclosed upper section for user guide & reagent packs
Power 4 AA batteries (>3000 tests)
Regulatory and Safety (CE)
Environmental Operating Conditions ±1999.9 mV
Ambient Operating Temperature 5 to 40 °C
Relative Humidity 30 to 90%, Non-Condensing at 30°C
Certifications CE
Waterproof Rating IP67
Warranty 2 year