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Testing Water Quality

Testing Water Quality

When the quality of water for concrete preparation is uncertain, its impact on the setting time of cement and compressive strength of mortar is assessed by comparison with de-ionized or distilled water benchmarks. American Society for Testing and Materials (ASTM) C1602 requires the setting times to be within 90 minutes of the control, British Standard (BS) 3146:1980 allows a 30-minute variance in the initial setting, while British Standards European Norm (BS EN) 1008 specifies initial setting...

Controlled-Current Coulometry: Overview

Controlled-Current Coulometry: Overview

Controlled current coulometry, also known as amperostatic coulometry, is a technique used in electrochemical analysis to measure the quantity of a substance through the controlled passage of current. It involves the application of a constant current to an electrochemical cell containing the analyte of interest. As the current flows through the cell, the analyte undergoes a redox reaction at the electrode surface, resulting in a charge transfer. By monitoring the time required for a certain...

Capillary Electrophoresis: Instrumentation

Capillary Electrophoresis: Instrumentation

Capillary electrophoresis instrumentation typically consists of several key components. A high-voltage power supply generates the electric field necessary for the separation by connecting to an anode (the positively charged electrode) and a cathode (the negatively charged electrode) located in buffer reservoirs at each end of the capillary tube. The system includes a sample vial, a fused silica capillary tube coated with polyimide for mechanical strength through which the sample components...

Potentiometry: Overview

Potentiometry: Overview

Potentiometry is an analytical technique that measures the potential difference between two electrodes in an electrochemical cell without drawing any significant current that could alter the solution's composition. This method employs an indicator electrode, which exchanges electrons with the analyte solution, and a reference electrode with a constant potential. Each electrode is immersed in a solution comprised of two half-cells. In a conventional setup, the reference electrode serves as the...

Controlled-Current Coulometry: Coulometric Titration

Controlled-Current Coulometry: Coulometric Titration

Coulometric titrations are a form of titrimetric analysis where the reagent is generated electrically, and its amount is evaluated based on current and generating time. The electron serves as the standard reagent. The procedure is similar to conventional titrations, such as endpoint detection.
The fundamental requirements for coulometric titrations are (1) 100% efficiency in the reagent-generating electrode reaction and (2) a stoichiometric and preferably rapid reaction between the generated...

Potentiometry: Membrane Electrodes

Potentiometry: Membrane Electrodes

Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at the...

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Related Experiment Video

Updated: Jul 15, 2026

A Low-Cost Method of Measuring the In Situ Primary Productivity of Periphyton Communities of Lentic Waters

A Low-Cost Method of Measuring the In Situ Primary Productivity of Periphyton Communities of Lentic Waters

Published on: December 16, 2022

Lower currents: a new choice for routine testing.

¹Rigel Medical.

Biomedical Instrumentation & Technology

|April 17, 2007

Summary

Biomedical engineers can now use low current testing for safer, more efficient in-service medical equipment inspections. This approach reduces equipment damage and operator risk, making field maintenance more flexible and cost-effective.

Area of Science:

Biomedical Engineering
Electrical Safety Testing
Medical Device Maintenance

Background:

U.S. standards (NFPA, AAMI) recommend 10A ground bond tests.
International standards permit 25A and 200mA test currents for medical equipment.
Both high and low test currents have distinct applications in biomedical engineering.

Purpose of the Study:

To evaluate the efficacy and safety of low current testing for in-service medical electrical equipment.
To compare the benefits of low current testing versus high current testing in different scenarios.
To highlight the advantages of modern electronic technology in facilitating safe and effective low current testing.

Main Methods:

Discussion of recommended test currents (10A, 25A, 200mA) based on standards.

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Last Updated: Jul 15, 2026

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Analysis of the suitability of high current testing for workshop environments.

Exploration of the application of low current testing for in-service field maintenance using modern electronic testers.

Main Results:

High current testing remains suitable for safe, controlled workshop environments.
Low current testing, enhanced by modern technology, is effective and safe for in-service applications.
Low current testing offers increased operator safety and reduces the risk of damaging medical equipment.

Conclusions:

Low current testing, particularly with a preceding low-energy, high current pulse, is preferred for routine field maintenance.
Benefits include smaller, battery-operated test instruments, increased engineer flexibility, reduced equipment downtime, and cost savings.
Modern electronic advancements enable safe and effective low current testing for improved medical equipment management.