Fixed vs Portable Gas Detection Equipment

Fixed gas detectors are permanently installed in strategic locations, providing continuous, real-time monitoring of the air for specific gas types and concentrations. When a pre-set threshold is reached, alarms trigger, alerting workers to take immediate action, such as increasing ventilation or evacuating the area. Portable gas detectors are handheld devices that are used for spot checks, pre-entry checks before entering confined spaces and while inside confined spaces. These personal monitors are often capable of monitoring multiple types of gases and ensure work safety during maintenance procedures. When deciding which gas detection device to use you must take into consideration the physical area to be monitored, the type of gas(es) to be monitored, whether the hazard is permanent or transitory, the level of risk to workers and the practicality and cost effectiveness of using either or both systems. Monitoring for single or multiple hazardous gases in large areas populated with many people is best achieved by having a fixed gas detection system. Portable IAQ monitors are perfect for detecting gases in confined spaces or smaller areas where people occasionally go. Particulate monitors with temperature and relative humidity readings are ideal for dusty or smoky areas. Fixed Gas Detection Systems Portable Gas Monitors Permanently installed, stationary systems that are practically invisible to the general worker population until the alarm sounds and evacuation procedures need to be followed. Assigned to workers who keep them on their person as they move around. Each worker requires their own unit and training on how to use it. Ideal for large areas populated by many workers and/or areas where worker movement is unrestricted. Somewhat impractical for detection in confined spaces such as sewers, storage tanks, pits, fermenters, etc. Ideal for small areas such as confined spaces and/or areas where security clearance to enter is required. Very costly if used as the only gas detection system for large areas such as a manufacturing plant with lots of equipment and workers. Monitoring is continuous and the power source is (generally) constantly available and devices don't need to warm up prior to each use. Monitoring is only when the unit is on, warmed up and the battery is charged. Does not need to warm up prior to each use. Warm up period required each time the device is turned on. Bump testing suggested every 30 days. Bump testing recommended before each use. Wide range of sensor type combinations available. Combinations of sensor types are limited. Ideal for monitoring any type of toxic, combustible or refrigerant gas because devices are strategically placed in key locations where the hazardous gas is likely to accumulate. Where the worker goes, the monitor goes and heavier gases that concentrate inches off the floor or lighter gases that rise overhead may not be detected until concentration levels are serious. Sensors can have longer life expectancies because in some cases they are larger. Compact, handheld devices tend to accommodate small sensors, which don't have the same lifespan as larger sensors. Devices are fixed in one place reducing the rate of wear and tear and they can be shielded from damage with a splash guard and/or metal protective guard. Devices more likely to sustain wear and tear and/or damage due to human negligence and the fact it is physically moved around in different environments. Typically have analog and/or digital output(s) so remote alarms can be turned on and/or safety processes can be triggered (ie. fans turn on, systems shut off, etc.) When hazardous gas is present above an acceptable limit, an audible alarm sounds, LEDs flash and a vibrating alarm is activated if the unit is so equipped. Working together: The portable gas monitor is advantageous for locating the exact point of a leak that has first been detected by the fixed system when using an attached probe. The portable gas monitor is convenient for detecting a single gas that may be likely to leak in a small area where workers occasionally go, while the fixed system concurrently and constantly monitors the general areas for other hazardous gases. Implementing a combination of fixed and portable gas detection systems helps ensure comprehensive monitoring and safety compliance in some applications.