Gas detectors can be divided into four main types:
All gas detectors must be calibrated on a given schedule. Many fixed type gas detectors must be calibrated at least once a year, while others must be calibrated quarterly or bi-annually. Check with the manufacturer of your unit.
Portable gas detectors have to be calibrated on an almost daily basis or before every single use.
This depends on the gas or application for which a gas detector is needed.
Things to consider include:
A single gas detector depending on the technology can cost between $100 and $400 while multi-gas detectors can cost from $600 AUD to about $800. Infrared technology is the most expensive.
It depends on the application and type of gas detector needed. For example, for multi-gas and fixed applications, infrared technology is preferred as it can quickly differentiate between gasses and can measure the concentration of each gas.
To effectively detect nonflammable gasses electrochemical technology is preferred. The catalytic bead technology can detect hydrogen in an inert atmosphere whereas infrared technology cannot.
There are two main problems associated with gas detectors.
Sensor poisoning - Permanent damage to a catalytic bead gas detector where substances adhere to the sensor and seriously affect the accuracy of the detector. The most common substances that cause this are silicon-based products.
Drift - The gradual decrease in the reading or accuracy of the detector due to material build-up on the sensor or simply due to the weakening of the sensor over time. Extreme changes in the environment like temperature, pressure, and even moisture can also cause drift gas detectors. Infrared technology is immune to both of these issues.
Gas detectors regularly need calibration for proper working but they do not need any type of maintenance as they are fairly simple devices and do not have any moving or consuming parts.
Most popular Gas Detector suppliers and brands on IndustrySearch are Sayka, HMA Group, Pacific Sensor Technologies Pty Ltd, MSA Australia, Honeywell - Advanced Sensing Technologies, Air Energy, HK Calibration Technologies, Test Equipment, Trident Australia, OBIAT Electronics Pty Ltd.