How is Stability Related to ASHRAE 62.1 Standards?

ASHRAE 62.1 Standard for Ventilation for Acceptable Indoor Air Quality provides recommendations for minimum ventilation rates and other parameters to ensure good indoor air quality (IAQ). Keeping the IAQ at a safe level will help to minimize any adverse health effects caused by air quality factors. 

The 62.1 standard is intended for both new building and building addition projects. It can also be used as a guide for the improvement of IAQ in existing buildings.

In order to properly conform to the ASHRAE 62.1 standard, it is necessary for sensors to be both stable and accurate. Continue reading “How is Stability Related to ASHRAE 62.1 Standards?”

What is Stability and Why is it Important?

Stability is defined as a change (or lack of change) in accuracy over a period of time.

Drift is commonly used as a specification to illustrate the stability, or change in accuracy over a period of time, commonly shown as X%/year where X = a number; i.e. 0.25%/year. In this scenario, a device with a ±1% accuracy, would be expected to have an accuracy of ±1.25% (1%+0.25%) after a period of one year. Depending on the design, brand, and range of the sensing instrument, the stability can vary widely. Continue reading “What is Stability and Why is it Important?”

Dwyer Instrumentation at Steamfitters 449 Training Center

Steamfitters 449 is a union training center that represents nearly 2,700 union-trained steamfitters and are affiliated with the United Association of Journeymen and Apprentices of the Plumbing and Pipefitting Industry of the United States and Canada.

According to the their website, members are highly trained craftsmen who fabricate, install, and service piping systems. Their craftsmen may be found on job sites involving single-family homes, garden and high-rise apartment buildings, supermarkets, food warehousing and processing facilities, power plants, chemical installations, factories, public buildings, and healthcare facilities.

Continue reading “Dwyer Instrumentation at Steamfitters 449 Training Center”

USP Guidelines for Compounding Facilities

The United States Pharmacopeia (USP) is a non-profit organization that develops standards for human and animal drugs as well as food ingredients and dietary supplements.

For pharmaceutical compounding facilities, USP has guidelines in four general chapters:

  1. USP <795> Pharmaceutical Compounding – Nonsterile Preparations
  2. USP <797> Pharmaceutical Compounding – Sterile Preparations
  3. USP <800> Hazardous Drugs – Handling in Healthcare Settings
  4. USP <825> Radiopharmaceuticals – Preparation, Compounding, Dispensing, and Repackaging

These four chapters provide guidelines for safety considerations, personnel qualification and training, facilities and engineering controls, microbiology and surface monitoring, cleaning and disinfection, and much more. Continue reading “USP Guidelines for Compounding Facilities”