The Apera Instruments TN400 provides fast and reliable measurements of the turbidity (turbidity) of liquids. The instrument is equipped with an infrared light emitting diode (860 ± 30 nm) and operates using a nephelometric 90° scattering method that complies with ISO 7027 and DIN EN 27027 standards for determining the turbidity of aqueous solutions. The large LCD with progress indicator and intuitive operating instructions in picture and text form make it user-friendly and easy to operate.

Technical Specifications

Measuring method	Nephelometric method (90°) according to ISO 7027 / DIN EN27027
Light source	Infrared LED（860±30nm）
Measuring range	0 ~ 1000 NTU, automatic range selection: 0.01 ~ 19.99 NTU 20.0 ~ 99.9 NTU 100 ~ 1000 NTU
Accuracy	≤ ±2% of reading ± stray light
Reproducibility	≤ ±1% of reading or 0.02 NTU, whichever is greater
Resolution	0.01 / 0.1 / 1 NTU
Stray light	≤ 0.02 NTU
Calibration standard	0, 20, 100, 400, 800 NTU AMCO Polymer or Formazin
Light detector	Silicon photocell
Measuring modes	Normal measurement and average measurement mode
Display	TFT color display
Measuring cells	ø25×60 mm, borosilicate glass with screw cap
Test volume	18 ml
Energy supply	4 × 1.5V AA batteries
Temperature range	0-50°C（32˚F-122˚F）
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
Quality and safety guidelines	CE / RoHS
Dimensions (W×L×H) /Weight	Meter: (90×203×80) mm/ 385 g Transport case: (310×295×110) mm/ 1.5 kg

A complete set contains:

• TN400
• Calibration solutions (0.0 NTU, 20 NTU, 100 NTU, 400 NTU, 800 NTU)
• 6 sample cuvettes
• Silicone oil
• Screwdriver
• Microfiber cloth
• 4x AA battery
• manual
• Carrying case

The TN400 is CE certified and has a 2 year warranty.