+ Submit your article here

What are Gas Detector Tubes?

10/8/2013 4:30:11 PM | by Anonymous

Gas Detectors: Tube

A gas detector tube is a device that detects the presence of various types of gases within an area. It is usually part of a safety system. This range of equipment is used to detect gas leakages and interface the issue with a control system in order for the process to automatically shut down. A gas detector also has the ability to sound the alarm to operators in the vicinity to inform them as to where the leak is occurring providing them with the opportunity to evacuate the area. It is important to have this type of device as there are many gases that are potentially harmful to organic life.


Gas detector tubes are also widely used to detect flammable, combustible, oxygen depletion and toxic gases. They are commonly used in industrial areas and can be found in locations like oil rigs. Additionally, they help to monitor the manufacturing processes and emerging technologies such as photovoltaic. They can also be used in fire fighting.


Gas detector tubes are typically battery operated. They transmit warning signals via series of audible and visible alerts such as flashing lights and alarms when dangerous levels of gas vapours have been detected. As detectors measure the gas concentration, the sensor in turn responds to the calibration gas that serves as a reference point or scale. As the sensor’s detection exceeds the preset alarm level, the alarm or signal will automatically be activated. Gas detectors tubes are produced as portable or stationary devices counted in units. Originally, detectors were produced to detect single gases. With time and technology advancement, the modern units are now able to detect several toxic or combustible gases sometimes even a combination of both types.


Gas detector tubes can be classified based on their operation mechanism. The categories are oxidation, catalytic, semiconductors, infrared and etc. Gas detectors are most commonly found in two forms the portable devices and fixed gas detectors. The portable devices are used to monitor the atmosphere around personnel and are typically worn on clothes or on a belt or harness. The second are fixed type which is used for detection of one or more gas types. Fixed detectors are generally mounted nearer to the process area of a control room or the plant. They are generally installed on fixed mild steel structures with a cable connected to a SCADA system for the continuous process of monitoring. This is also where a tripping interlock can be activated during an emergency situation. Newer gas analyzers can also break up the component signals in a complicated aroma to identify the several simultaneous gases.


All gas detectors have to be calibrated on a schedule. Between the two types of gas detectors, portable ones must be calibrated more frequently due to the regular changes made in the environment they experience. A typical calibration schedule can also be scheduled for a fixed system. They can be quarterly, bi-annually, even annually for some of the robust units.


A typical schedule for a portable gas detector is done via a daily bump test accompanied by a monthly calibration. Every portable gas detector in the market has a specific calibration gas requirement that is available from the manufacturer that the monitor is purchased from.


Due to the hazardous nature of oxygen displacement, workers are encouraged to use oxygen deficiency gas monitors for their safety. A rapid decrease of oxygen due to the displacement of oxygen by certain gases can cause the environment to become very dangerous for employees. Having this in mind, an oxygen gas monitor is important to have when cryogenics are present. The typical users of oxygen monitors are MRI rooms, pharmaceutical, semiconductor and laboratories.


Are you sourcing for a product or service?

Do you need a quotation?