1. This practice is applicable to sensors that are intended to monitor a given analyte or physical property in the water, on a continuous basis without interaction with the operator for long periods of time. 2.The practice is applicable to sensors that measure continuously in the water. Examples include: environmental waters, processes that manipulate the composition of water in some way, and ambient waters. 3.The core specifications include: accuracy or bias, limit of detection, limit of quantation, single instrument repeatability (precision), range, response time, short-term drift, and ruggedness. 4.This practice covers the definitions of the core specifications 5.This practice is a compilation of tests that can be performed by both the producer and user to determine a core specification.
Today new and ever improving water quality monitoring sensors are being developed that allow for the collection of data in quantities and frequency than ever before. Even though the sensors are capable of monitoring in vastly different environments and can often meet data acquisition and storage requirements, there still remains the question of the data validity and field confirmation. Most methods that deal with performance specifications were developed with the laboratory methods and applications. These can differ in both the practicality of the test and the realistic understanding of the environmental constraints of such a test method. Currently available methods did not encompass field applications and the wide environments that on-line sensors encounter. The monitoring community has shown significant interest and need for such a practice. This includes: manufactures of equipment, regulators, and numerous government entities. The development of such a method will provide guidance on how manufactures can test to a certain reference method, and these same methods can then be used by the customer to validate these specifications and validate field performance.
core specification; analytical performance specifications; continuous; on-line sensor
The title and scope are in draft form and are under development within this ASTM Committee.
Citing ASTM Standards
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