Scope of Application

【Operating Instructions】

At the 2002 annual meeting of the International Down and Feather Bureau (IDFB), the method of using a dedicated turbidimeter to test the turbidity (transparency) of down and feathers was approved as an official IDFB standard. The US-made LM 2020 Turbidimeter (NTU) has become the IDFB-designated instrument for transparency testing.

Applicable Scope:
At the 2002 annual meeting of the International Down and Feather Bureau (IDFB), the method of using a dedicated turbidimeter to test the turbidity (transparency) of down and feathers was approved as an official IDFB standard. The US-made LM 2020 Turbidimeter (NTU) has become the IDFB-designated instrument for transparency testing.

Instrument Features:

1. IP67 Waterproof rating

2. Rechargeable lithium battery

3. USB interface

4. Supports 7 languages

5. Optional EPA and ISO standards

Technical Parameters:

1. Measurement Standards:

• 2020we: NTU, AU, ASBC, EBC

• 2020wi: FNU, FAU, ASBC, EBC

2. Range: 0-4000 NTU/FNU, 0-10,500 ASBC, 0-150 EBC

3. Resolution:

• 0.01 NTU/FNU (10.00-10.99)

• 0.1 NTU/FNU (11.00-109.9)

• 1 NTU/FNU (110-4000)

4. Accuracy:

• From 0-2.5 NTU: ±0.05 NTU

• From 2.5-100 NTU: ±2% NTU

• Above 100 NTU: ±3% NTU

5. Detection Limit: 0.05 NTU/FNU

6. Range Selection: Automatic

7. Light Source:

• Tungsten (EPA): Complies with EPA Method 180.1

• LED (ISO): Complies with ISO 7027

(Note: In the original text, "NTC" appeared in a few places under resolution and detection limit. Since this is a turbidity meter, I have corrected these to "NTU" to ensure professional accuracy.)