There are two types of measurements made when preparing gas mixtures. The first is measuring what goes into the cylinder (volumetric or gravimetric measurement), and the second is measuring what comes out of the cylinder (measurement based on analysis). The first is relatively simple, as you need to only have:
Once you’re done with your calibration gas cylinder it’s important to safely dispose of it. All CAC GAS cylinders can be returned to us for proper disposal. Some can be reused, others cannot. No cylinders should be put into general waste and it can be difficult to find a recycler who will accept cylinders.
The 552DS cylinder is designed to take advantage of the convenience and portability of the 103DS disposable steel cylinder as well as the high capacity of a typical larger, high-pressure cylinder.
Many 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.
Calibration & specialty gas mixtures are stored in two main cylinder types.
For much of the past 25 years little had changed in the availability and selection of calibration gas cylinders/mixtures for gas detection applications. Manufacturers were happy to enjoy the profits of selling 58 litre cylinders for standard 4 gas (H2S/CO/CH4/O2) mixtures and single corrosive gas mixtures.
It was not until 2008 when CAC GAS & Instrumentation in partnership with Scientific and Technical Gases (UK) introduced a unique and customer-focused solution. The 112DA Cylinder.
This was the first disposable gas cylinder pressurize to 70 bar (1000psi) for use with gas detection instruments. Prior to this, gas cylinders were pressurized to only 35 bar or less.
This increased pressure provided the opportunity to double the gas volume in the same size cylinder giving customers, for the first time 112 litres of gas, in the same size cylinder as the 58 litre.
The benefits were quickly realised and it became known as the 112 Litre Solution!
Calibration gas selection is critical in the operation of any combustible gas detector.
A combustible gas detector will respond to a wide variety of ignitable gases and vapours. How the sensor responds is directly dependent upon which gas is selected to calibrate the instrument.
There are a few factors to consider when choosing your gas cylinder size now that there is greater availability in the market.
