PrimeLab 1.0 Multitest Manual De Usuario página 296

Turbidity
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Note(s)
-> (*) conversion to FTU (same as FAU)
-> FAU stands for Formazin Absorption Units, different from the NTU
(nephelometric) method.
-> The measurement should be conducted immediately after sampling.
-> Air bubbles will influence the measurement result.
-> Tinted water samples influence the result. In this case do not use distilled
water (step 1) but rather filtered sample water for the ZERO adjustment.
-> The Turbidity test measures the optical value of the sample which results
from the scattering and absorption of light particles.
The amount of turbidity depends on variables such as size, shape, colour
and the refractive nature of the particles.
This test is calibrated using Formazin Turbidity Standards and the readings
are in terms of FAU (Formazin Attenuation Units).
This test can be used for daily plant monitoring and 1 FAU is equivalent to 1
NTU (Nephelometric Turbidity Unit).
This test is not suitable for USEPA reporting purposes as the optical method
of measurement for FAU is very different than the NTU method.
However 1 NTU = 1 FTU = 1 FAU when traced to formazin primary
standards.
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20 - 1000 FAU
Name on device: 59-Turbidity
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