Orion AQ4500 Turbidimeter

  • Dual source to comply with EPA 180.1 and ISO 7027
  • Nephelometric and Ratiometric measurements with autoranging
  • Readings in the range of 0 to 1000 NTU Choice of units: NT, FTU, FNU, ASBC or EBC
Product Options


The AQ4500 turbidimeter operates on the nephelometric and ratiometric principles and is the most advanced portable microprocessor based turbidity meter available today. It allows turbidity measurement based on EPA180.1 and ISO 7027, as well as an IR ratio mode that will give results in accordance with EPA GLI method 2. The Aq4500 can take measurements using NTU, FTU, FNU , ASBC , or EBC units and can log 100 data points that can then be downloaded to a computer or printer.

The AQ4500 turbidimeter is supplied with a turbidity standards kit, a rugged carrying case and replacement 24mm cuvettes. It is IP67 waterproof and has a typical battery life of over 100 hours on one set of batteries.

Manufactured by: Thermo Scientific
Model: Orion AQ4500 Turbidimeter

Services offered for this product

  • Sales
  • Rental
  • Installation
  • Calibration
  • Maintenance


Field or lab use
Water sample testing kit
Water quality


Light source White LED, IR LED
Temperature effect LED temperature compensated
Includes measurement modes EPA 180.1, ISO nephelometric, ISO absorbance, IR ratiometric, % transmittance, EPA GLI method 2, EBC (Europeon Brewing Chemists) and ASBC (American Society of Brewing Chemists)
Measurement ranges 0 to 4000 NTU, EPA 0 to 2000 NTU, GLI range 0 to 40 NTU, ISO-7027 0 to 150 FAU, IR Ratio 0 to 4000 NTU, EBC 0 to 24.5, ASBC 0 - 236
Resolution PC000.01 (0 to 99.9 NTU), 0.1 (10 to 99.9), 1 (100 to 1000)
Precision ±2% of reading plus 0.01 NTU from 0 to 500 NTU,
±3% of reading from 500 to 100 NTU,
±5% of reading from 1000 to 2000 NTU
Calibration standards Provides primary SDVB standards
Sample size minimum 10 mL
User interface Automatic sample measurement for each measurement with simple user interface
RS232 Bidirectional
Datalog 100 points
Real time clock Yes
Power Long life - low power consumption - about 2500 hours with 4 alkaline AA batteries or about 10000 with lithium batteries
Waterproof rating IP67
Warranty 2 years
Regulatory and safety CE, FCC part 15
Operating temperatures (-40 °C to 60 °C),
90% relative humidity at 30.0 °C max