Greg Shires

      Greg Shires

      Connect with me:

      Author's Posts

      NRC Regulators...more options and uses than you may think.

      Greg Shires

      The typical application for bump testing or calibrating your instrument using an NRC regulator requires a fixed flow 0.5 litre/min regulator, a bit of tubing; a calibration cup; your gas mixture; and you are good to go.

      There is nothing wrong with that, provided you are using the correct flow rate, regulator material and tubing. If your instrument has an internal pump, then you should be using the On-Demand Flow Regulator

      There are several regulators which can be used with NRC gas mixtures. Here are a few ideas for making your bump test or calibration system more efficient and functional.

      Read More
      Topics: Gas Detection, Gas Control & Regulator Selection

      Calibrating HCN Instruments at Low Concentrations

      Greg Shires

      Gold mines worldwide use cyanide to extract gold from ore.  As environmental standards have increased in most mining areas around the world, cyanidation plant tailings must be treated to remove the cyanide and various cyanide compounds, including hydrogen cyanide (HCN), before they are discharged into a tailing storage facility.  Methods to remove the cyanide and destroy it have increased in cost to the point where processes to recover the cyanide for reuse have become more cost effective than purchasing new cyanide.  

      Read More

      Ozone for Water Treatment

      Greg Shires

      Ozone can be used for the treatment of water in multiple industries including municipal water treatment; wastewater; bottled water, wineries and breweries; aquaculture; drinking water for livestock; hydroponics; water treatment in cooling towers and air washers; public swimming pools; aquariums and zoos; commercial laundry facilities; soil/groundwater remediation and more.

      Ozone is typically generated using the electrical discharge method where oxygen is exposed to high voltage resulting in oxygen molecules colliding with O2 to create the unstable O3 molecules. 

      Ozone is 13 times more soluble than oxygen. This solubility makes ozone very useful in many water treatment applications. Ozone can be dissolved in water much easier than oxygen although it does still require mechanical mixing.

      Ozone is one of the most effective oxidants on earth, making it better than most chemical alternatives at breaking down contaminates and killing bacteria.

      Read More
      Topics: Gas & Cylinder Selection, Gas Detection, Water & Wastewater Treatment

      Calibration Gas Solutions for Measuring Nitrogen Dioxide (NO2)

      Greg Shires

      Nitrogen dioxide (NO2) is one of a group of highly reactive gases known as oxides of nitrogen or nitrogen oxides (NOx). Other nitrogen oxides include nitrous acid and nitric acid. NO2 is used as the indicator for the larger group of nitrogen oxides.

      Read More
      Topics: Gas & Cylinder Selection, Gas Hazards & Dangerous Goods, Gas Detection

      Q & A: CEMS Applications in the Marine Industry, with Andreas Heublein

      Greg Shires


      1. What is your primary focus in the Marine Market?

      Westfalen/Heublein provide specialty gas mixtures for the calibration of Continuous Emission Monitoring Systems for marine shipping industry.

      Read More
      Topics: Gas Theory & Applications, Marine

      What’s happening with permissible limits for gases in the workplace?

      Greg Shires

      What are exposure standards?

      Exposure standards, listed in the Workplace Exposure Standards for Airborne Contaminants, represent the airborne concentration of a particular substance or mixture that must not be exceeded.

      There are three types of exposure standard:

      • 8-hour time-weighted average (TWA)
      • short term exposure limit (STEL).
      • peak limitation
      Read More
      Topics: Gas Hazards & Dangerous Goods, Gas Detection

      Measurement and Calibration Issues with Photo-ionization Detectors

      Greg Shires detectors (PID) are a valuable tool when measuring low level concentrations of organic vapours and hydrocarbons. Organic and inorganic compounds can be measured by a PID in levels anywhere from parts per billion (ppb) up to 10,000 parts per million (ppm).

      Introduced originally as a handheld measuring device, photo-ionization sensors are now found in both single gas and multi-gas gas detection instruments.

      The increase in the use of the PID’s for measuring VOC’s (volatile organic compounds) in different environments creates potential errors in the use of this valuable tool.

      Like all sensor types there are a variety of issues, such as cross sensitivity or interference with photo-ionization (PI) sensors, which users must be aware of in order to use the instrument correctly. 

      Read More
      Topics: Gas Theory & Applications, Gas Detection

      Prevent Contamination Of Your Gas Mixtures

      Greg Shires

      CAC-Cylinder-Family-172694-editedMany instrumentation manufacturers are producing gas detection monitors with multiple sensor capability of 4, 5, 6 or more sensors in one instrument. Many of those instruments are measuring toxic gases such as ammonia, chlorine, hydrogen cyanide, nitrogen dioxide and other gases.   

      Calibration and bump testing will be a requirement for all these sensors but unlike a standard 4 gas mixture of H2S/CO/CH4/O2 each gas must be separate and cannot generally be mixed with other gases. There are potential issues which can arise if correct procedures for handling these gases is not used.

      Read More
      Topics: Gas Theory & Applications, Gas & Cylinder Selection, Gas Detection