Meets ISO 7027, DIN EN 27027, DIN 38404 and NFT
9033
ASTM D7315 - Standard Test Method for
Determination of Turbidity Above 1 Turbidity Unit (TU)
in Static Mode
ASTM D6655 - Standard Test Method for
Determination of Turbidity Below 5 NTU in Static Mode

Light source

Light-emitting diode (LED) at 860 ± 30 nm

Measurement modes

FNU, FAU, NTU, EBC, Abs (absorbance), %T (%
transmittance) and two user-defined units

Specification

Details

Range

FNU (manual range): 0–0.999, 0–9.99, 0–99.9, 0–1000
FNU (auto range): 0–1000
FAU (manual range): 20–99.9, 20–10,000
FAU (auto range): 20–10,000
NTU (Ratio on, manual range): 0–0.999, 0–9.99, 0–
99.9, 0–10,000
NTU (Ratio on, auto range): 0–10,000 auto decimal
NTU (Ratio off): 0–40
EBC (Ratio on, manual range): 0–0.999, 0–9.99, 0–
99.9, 0–2450
EBC (Ratio on, auto range): 0–2450 auto decimal
EBC (Ratio off): 0–9.8
Absorbance (manual range): 0–0.999, 0–2.00
Absorbance (auto range): 0–2.00
Transmittance (%): 1.0–100

Accuracy

FNU

: ±2% of reading plus 0.01 FNU from 0–1000 FNU

FAU: ±10% of reading from 20–10,000 NTU
NTU

: ±2% of reading plus 0.01 NTU from 0–

1000 NTU, ±5% of reading from 1000–4000 NTU,
±10% of reading from 4000–10,000 NTU
Absorbance: ±0.005 Abs from 0–1 Abs at 860 nm
Transmittance: 0.12% T from 10–100% T at 860 nm

Resolution

Turbidity: 0.001 FNU/NTU/EBC
Absorbance: 0.001 Abs
Transmittance: 0.1% T

Repeatability

±1% of reading or 0.01 FNU, whichever is greater
(under reference conditions)

Response time

Signal averaging off: 6.8 seconds
Signal averaging on: 14 seconds (when
10 measurements are used to calculate the average)

Stabilization time

Immediately

English 3