The Apera Instruments TN500 provides fast and reliable measurements of the turbidity (turbidity) of liquids. The instrument is equipped with a tungsten filament lamp and operates via a 90° nephelometric scattering method that is consistent with U.S. EPA 180.1 method for determining turbidity in drinking, ground, surface, and saline waters, as well as in domestic and industrial wastes. It is well suited for rapidly settling samples or fluctuating or variable measurements thanks to TruRead™ measurement mode. The TN500 has a memory function for up to 200 data sets and can be connected to a PC via USB to read out the data or perform real-time storage. The large LCD with progress indicator and intuitive operating instructions in picture and text form make it user-friendly and easy to operate. It is suitable for use on site or in the laboratory.

Technical Specifications

Measuring method	Nephelometric method (90°), U.S. EPA180.1 compliant
Light source	Tungsten light bulb
Measuring range	0 ~ 1000 NTU (FNU), automatic range selection: 0.01 ~ 19.99 NTU (FNU) 20.0 ~ 99.9 NTU (FNU) 100 ~ 1000 NTU (FNU)
Accuracy	≤ ±2% of reading ± stray light
Reproducibility	≤ ±1% of reading or 0.02 NTU, whichever is greater
Resolution	0.01 / 0.1 / 1 NTU (FNU)
Stray light	≤ 0.02 NTU (FNU)
Calibration standard	0, 20, 100, 400, 800 NTU (FNU) AMCO Polymer or Formazin
Light detector	Silicon photocell
Measuring modes	Normal measurement and TruRead™ measurement
Data storage	200 measurement groups
Interface	USB
Calibration memory	Calibration date and time
Display	TFT color display
Measuring cell	ø25×60 mm, borosilicate glass with screw cap
Test volume	18 ml
Energy supply	3.7V rechargeable lithium battery
Operating conditions	Temperature: 0 - 50°C；rel. Humidity: 0 - 90% at 30°C, 0 - 80% at 40°C, 0 - 70% at 50°C, no condensation
Storage conditions	Gauge: -40 to 60°C (-40 to 140°F) Calibration solutions: 5 to 30°C (41 to 86°F)
IP rating	IP67
Security guidelines	ISO9001:2015 and CE
Dimensions (WxLxH) /Weight	Meter: (90×203×80) mm/ 385 g Transport case: (310×295×110) mm/ 1.5 kg

A complete set contains:

• TN500
• Calibration solutions (0.00 NTU, 20.0 NTU, 100 NTU, 800 NTU, 800 NTU)
• 6 sample cuvettes
• Silicone oil
• Microfiber cloth
• USB stick with software
• USB power supply
• manual
• Carrying case

The TN500 is CE certified and has a 2 year warranty.