Basic Metering Overview – Part 1
Basic Metering Overview – Part 2
In this episode, Mike and Bob discuss the enormous amount of information on the topic of metering and sensoring. They also explain the most common technologies and techniques used in monitoring.
Complete Show Notes
5:50 Why Metering Matters
- Metering is vitally important to hazmat – it determines the atmosphere we’re entering and the types of harms we expect it to impose
6:55 Why Do We Monitor a Scene?
- Establish zones and exposure potentials for us and the public
11:30 Things to Meter For
- 1. Radiation – this is one of the first things you want to meter for because it can touch you from a long distance away
- Influences PPE and SCBA selection – is there enough oxygen for you to breathe in that environment?
- Response time – time the meter needs to get a sample and put a number on the screen/move the needle
- Pass-by/diffusion – sample naturally passes by a sensor and gives a reading
- Field tests where a small sample of a known gas is used to express a response from the meter
25:25 What is Relative Response?
- Meters are calibrated against a known gas – typically one that’s in the middle of the range we’re looking for
29:40 Cross-Sensitivities and Interferences
- For the most part, chemical reactions drive these meters
- Very straightforward – it’s the point at which you must perform an action
33:30 Monitoring Techniques
- When you’re metering, you always have to consider whether the gas will rise or fall
- Many different types of sensors out there
- Can be used as a pass-by or pump-through
- Used to measure natural gas and hydrogen sulfide – also used in home meters to measure CO
- There are meters that perform the same action, but they’re typically not field-friendly
- Two main types in use – the CDS and the CMS
- M8 paper looks like pH paper and is dipped into the substance – it indicates using a color change that can be compared to a chart on the box
- The human body has no way to sense radiation exposure – it shows eventually, but by then, it’s too late
- This is a gas-filled tube that senses the amount of ions
- These have a tube that utilizes ambient air to detect ionized gasses
- These use a crystal that interacts with radiation – crystals can be made of sodium iodide, cesium iodide, or zinc sulfide
- Typically worn by a user to measure the dose that individual has taken
Have a question? Send an email to [email protected] or leave a message on our Haz Mat Guys comment hotline: 843-628-1484
Show Sponsors
Hazsim Training SystemsFlir PrimedRelated Episodes
- THMG015: Advanced Metering
