1.1 This test method is applicable to the on-line measurement of turbidity under 5 nephelometric turbidity units (NTU) in water.
1.2 It is the user's responsibility to ensure the validity of this test method for waters of untested matrices.
1.3 In this test method calibration standards are defined in NTU values, but other assigned turbidity units are assumed to be equivalent.
1.4 This method assigns traceable reporting units to the type of respective technology that was used to perform the measurement. Units are numerically equivalent with respect to the calibration standard. For example, a 1 NTU formazin standard is also equal to a 1FNU standard, a 1 FNRU standard and so forth.
This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D1129 Terminology Relating to Water
D1193 Specification for Reagent Water
D1889 Test Method for Turbidity of Water
D2777 Practice for Determination of Precision and Bias of Applicable Test Methods of Committee D19 on Water
D3370 Practices for Sampling Water from Closed Conduits
D3864 Guide for Continual On-Line Monitoring Systems for Water Analysis
calibration; calibration verification; continuous; formazin; measurement; monitoring; nephelometer; nephelometric; on-line; standard; styrenedivinylbenzene; turbidimeter; turbidity; turbidity standards;
ICS Number Code 13.060.60 (Examination of water for physical properties)
ASTM International is a member of CrossRef.
Citing ASTM Standards
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