Topic: Calibration

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Sealing an Oil Well; Orifice Sizing--OSO versus AGA
Can Someone Explain BP's Sealing Process to Temporary Seal the Oil Well from the BP Oil Spill in the Mexican Gulf? And, What Is the Difference Between the Orifice Calculations Described by AGA 3 and ISO 5167?

Reader Feedback: Long-Distance Calibration
A Reader Writes In to Tell Us That the Users We Quoated in an Article Are Not Considering the Latest Technology Presented at an ISA International Instrumentation Seminar

Long-Distance Calibration
Calibration Is Complicated at Best. Add Problems of Long Distance, Timing and Customs Regulations, and Things Get Really Tricky

Orifice Flow Measurement Accuracy
How to Calculate the Zero and Span Errors Caused by the Differences in Temperatures and Pressures Between Calibration and Actual

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White Papers: In Depth Research

Discussion of Flowmeter Accuracy Specifications
Author: Siemens
Posted: 01/21/2013
Understanding the accuracy of a given flowmeter is an important field but it can also be misleading as different specifications are used to explain how accurate a flowmeter measurement actually measures. This paper discusses the different specifications and interprets the impact of them.

Why deal with accuracy?

The reasons for dealing with flowmeter accuracy specifications are many-folded. One important reason is from an economical point of view. The more accurate a flowmeter can measure, the more money you will save as the medium is measured with only very little inaccurately.

Another reason is in terms of dosing, where a given amount of a medium is added. This must be done with a high level of precision and the accuracy is thus important in order to dose correctly. This is critical in certain industries such as in pharma or chemical.

A third reason is in terms of billing purposes. By performing with good accuracy, you know exactly how much fluid flows into the process. Thereby, you are able to determine the right price of the product and thereby bill the customers correctly.

Therefore, knowing how much that flows through your system is paramount in order to make a profitable and solid business. You need to rely on a precise measurement with good accuracy. However, good accuracy must be obtained not only in one measurement, but in all measurements independent of the time.

When and How to Inspect, Clean and Calibrate pH Sensors
Author: Fred Kohlmann, Endress+Hauser
Posted: 02/27/2012
This paper will address
- Knowing when to do a pH sensor calibration versus a calibration check
- How to properly clean a pH sensor
- How to perform a pH sensor calibration
- A decision tree for step by step guidance

The phrase in the above title is actually incorrect in its sequence of wording. All pH readings are supposed to be taken and accepted only when the pH sensor is clean. After all, a contaminated pH sensor may yield an incorrect reading. So one must make sure the sensor is clean before doing a calibration. Once a pH sensor is installed in the process and operating, how do you determine when it is time to take the sensor out of the process and do a cleaning, or a calibration? Does one perform both a cleaning and a calibration or just a cleaning, or just a calibration, or does one just perform a calibration check in buffers or...?

This is something that can be quite confusing, especially when the operational practices and procedures documented by your company's Quality Control or Environmental Practices department may not be specific enough when they describe the procedure or the timing on when to conduct the pH calibration and maintenance. Inversely, the procedures may be too specific, detailing many more procedures and operations than are actually required.

In practical terms, users must develop their own maintenance and calibration schedule. This schedule is accomplished by taking the pH sensor out of the process after a set amount of time, perhaps after a day or two to perform a visual inspection of the sensor. If after inspection you find no debris or fouling on the electrode and reference surfaces with the naked eye, rinse the sensor off in distilled water and perform a buffer check.

Calculating Total Uncertainty of Temperature Calibration With a Dry Block
Author: Beamex
Posted: 01/10/2012
Download this white paper to learn how to calculate total uncertainty of temperature calibration with a fry block and have a system that saves time, reduces costs and increases productivity.

Paperless Calibration Improves Quality and Cuts Costs
Author: Beamex
Posted: 07/14/2011
Paper is part of our everyday lives - whether in the workplace or at home. Global consumption of paper has grown 400% in the last 40 years. As manufacturing companies, our consumption of paper is far higher than it needs to be, especially given that there are technologies, software and electronic devices readily available today which render the use of paper in the workplace unnecessary. Calibrating instruments is an enormous task that consumes vast amounts of paperwork. Far too many automation companies still use paper-based calibration systems, which means they are missing out on the benefits of moving towards a paperless calibration system.

Download this white paper to learn more about the benefits of moving towards a paperless calibration system.

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