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Instrumentation Handbook Reference

Instrumentation Reference.

The following pages have comprehensive information for the day-to-day activities for instrumentation engineers. We have collected all freely available information on the internet and grouped and index it for easy reference. Since any form of technical reference is not complete without the latest information, we will be constantly adding any new relevant data to this INSTRUMENTATION REFERENCE section. We hope this section will make your day a bit easier as an INSTRUMENT PROFESSIONAL.

Click here to go to ONLINE REFERENCE
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Download your FREE Instrumentation Reference.

We have also compiled the following pages into e-book format for you to download and view offline. To download your FREE INSTRUMENTATION HANDBOOK ver 1.00,  please fill the following details and click download.

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You are free to distribute or copy this e-book. You can also freely upload this e-book to your web site for a free download, just forward a message to us that you are doing so.

Dewpoint Values

Dewpoint at Atmospheric Pressure:
Dewpoint at Line Pressure:

Absolute Values

Parts per million by volume: ppm(v)
Parts per million by weight: ppm(w)
Absolute humidity: g/m³
  lb/MMSCF
Optional Inputs
Gas Type:
of molecular weight
Line pressure:
 
 
 
Noise Calculators & Reporters
 

A new Applications section on our web site offers the following calculators:

  • Occupational Noise
    • Time Weighted Average Calculator
    • Hearing Protection Calculator
  • Environmental Noise
    • Ldn, Lden, CNEL Calculator
  • General Purpose
    • Decibel Calculator

The Occupational Noise calculators ease your task by providing printed reports. Online context-sensitive help will guide you through the process.
 

TWA Calculator and Report Maker
The magical Time Weighted Average
 

To calculate a worker's TWA you take the sound level and time spent at each location, do a few logs and anti-logs, apply some magic and get the TWA.

If you are all out of magic, you might find our TWA calculator useful. Enter the locations, levels and times, and it does the rest, even printing a report for your records.
 
Link
 

Hearing Protection Calculator
Do you know the level of protection?
 
You may calculate the sound level at the worker's ear when wearing hearing protection using either the popular NRR method or the more detailed HML and Octave Band calculations.

NRR
The easiest method, taking a protector's Noise Reduction Rating figure and applying it to the measured noise. The calculator can follow either the OSHA or NIOSH guidelines.
 
Link
 
HML
Slightly more detailed, requiring both "A" and "C" weighted measurements and the protector's H-M-L figures.
 
Link
 
Octave Band
 
The most detailed method, requiring Octave Band measurements and the APV figures for the hearing protector
 
Link
 
Ldn and Lden (CNEL) Calculator
Calculated from the 1-hour Leq
 
Ldn and Lden (or CNEL) is often used when checking the impact of noise on a community from a source such as an airport or road.

As people are more sensitive to noise at night, Ldn adds a 10dB weighting to levels between 10pm and 7am. The Lden and CNEL measurements go one step further and add 5dB to levels between 7pm and 10pm.

Our calculator can take hourly Leq measurements and calculate the Ldn and Lden for the full 24 hour period.
 
Link
 
Decibel Calculator
1 + 1 = 4
 
A useful tool for a lesson in dB math. As they are logarithmic, decibels cannot just be added together:
 
Link
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Instrumentation Handbook

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ABOUT OUR COMPANY

Siva & Associates Inc. is a Canadian company specializing in Process Control, Automation and Information Technology. We provide Instrumentation and Field Services.
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