Gas Detectors

  • Single and multi gas portable devices for measuring all types of oxygen, inflammable and toxic gases such as H2S, CO, SO2, Cl2, HCN, NO2, NH3, etc.
  • Equipment for detecting leaks and measuring gas concentration in the ranges of ppm, LEL% and VOL%

 

 

Gas detectors are one of the most important safety tools in various industries. By accurately measuring the concentration of different gases in the environment, these devices plays a vital role in maintaining the health and safety of employees and preventing accidents. In the following, we will examine the types of gas detectors, how they work and their applications.

 

What is a gas detector?

Gas detectors for measuring the concentration of gases are generally divided into two categories: fixed and portable. The gas detector is used to ensure the safety of industrial environments. Any industrial unit can use this equipment to measure the concentration of gases based on the amount of gases in the process. Determining the gases in the environment is one of the most important parameters for ensuring the safety of employees and equipment of an industrial unit. With the help of this equipment, it is possible to measure the concentration of different gases such as oxygen, flammable and all toxic gases such as H2S, CO, SO2, Cl2, HCN, NO2, NH3, etc.

 

2 Types of gas detectors: fixed and portable

Portable gas detectors, as their name suggests, can be carried and do measurement in different environments such as tanks, containers, etc. Fixed gas detectors are used in environments where constant monitoring of existing gas levels is required.

 

Portable gas detectors: permanent and temporary

Portable gas detectors are divided into two permanent and temporary groups. Temporary gas detectors with a lifespan of 1 to 3 three years from the time they are turned on, measure without needing to replace batteries, sensors, and other parts, and cannot be used after the end of their lifespan.

In contrast, permanent portable gas detectors, can be repaired and calibrated and can be used for a lifetime. These equipment are more complicated and require more maintenance so that they can be used for longer periods.

 

Single-gas and multi-gas detectors

Single gas detectors measure only one gas and are suitable for industrial units with a low variety of toxic and dangerous gases.

Quad Gases measure the four gases CO, O2, LEL and H2S, which are the most common gases required for monitoring in most industrial units. This default arrangement of sensors has increased the life span and reduced the cost of this equipment.

Multi-gas detectors are suitable for industrial units that intend to measure several specific gases, because these devices usually give customers the ability to measure up to 6 gases selectively. This aggregation of gases will reduce maintenance costs and the number of gases needed per unit, and give users the initiative to choose a personal arrangement of sensors.

Different types of gas detector sensors:

Sensors of gas detectors are divided into four main categories based on the measurement method.

  • Electrochemical sensor: In the electrochemical method, the gas to be measured undergoes a chemical reaction in the measuring cell, and based on the components of the reaction, the output electrode measures the electric current. As a result, electrochemical sensors are consumable and have a lifespan of 2 to 5 years, after which they must be replaced. These sensors are usually used to detect oxygen and toxic gases.

  • The catalytic sensor oxidizes the combustible gas and converts the temperature change into an electronic signal. This type of sensor is used to detect combustible gases such as propane, methane and hydrogen. The catalytic sensor is one of the most common types of sensors for measuring combustion gases in all types of gas detectors. The gas to be measured enters the sensor chamber through the flame arrester. The element’s heated catalyst, which has a temperature of about 500 degrees Celsius, facilitates the reaction of the input to the sensor and the oxygen in the air.
    This reaction causes the element to heat up to a higher temperature. Increasing the temperature will change the electrical resistance in the element. These changes in resistance are what are used for measurement.
    The catalytic sensor will need oxygen to function properly. If the oxygen level is too low, the gas will not go through the reaction process effectively and it will show lower readings than the actual value on the display.

 

  • An IR (InfraRed) sensor measures gases by determining the absorption of an infrared light source emitted by an air sample. This sensor is used to detect gases such as carbon dioxide that are not highly reactive and difficult to measure with electrochemical methods, and a wide range of combustible gases. If properly maintained, these sensors have a longer lifespan than other sensors and do not contain consumable components.

 

  • The ionization detector or PID (Photo-Ionization Detector) breaks the molecules into positively and negatively charged ions and measures the electric charge of these ions using a gas detector to display the amount of vapor or gas present. This sensor is used to detect volatile organic vapors (VOCs) and toxic gases. A PID measures a variety of toxic gases and a wide range of volatile organic compounds at very low to very high concentrations.

 

How to use gas detectors

In order to use the gas detector, one must first identify the type of gases in the environment and choose the appropriate gas detector. If using a portable gas detector, turn on the device and place it in the desired environment. The device automatically measures and displays the concentration of gases. For fixed gas detectors, installation and commissioning should be done by professionals. Users should be trained to interpret results and take safety measures if dangerous concentrations are detected.

 

Gas Detector Price

The price of a gas detector varies depending on the type (fixed or portable), the number of gases that can be measured, the range of measurement and the manufacturer’s brand. Single-gas meters are usually cheaper than multi-gas types. Temporary portable gas meters are less expensive than permanent types, but may be costly in the long run as they require complete replacement. Fixed gas meters are usually more expensive than portable types due to the complexity of installation and more features. To get the exact price, it is recommended to consult with specialized engineers at HIWACO.

 

HIWACO, Supplier of various gas detector types

The gas detector is a vital tool in ensuring the safety of industrial environments. Considering the variety of gas detectors and their sensors, choosing the right model for each industry is very important. Correct use, regular maintenance and periodic calibration of these devices can significantly reduce the risk of gas leakage accidents and provide a safe environment for employees.

In this regard, as one of the pioneers in providing advanced gas measuring devices, HIWACO has provided comprehensive and reliable solutions for various industries. Using the latest technologies of the world, high accuracy and extraordinary reliability, HIWACO gas detectors are a smart choice for ensuring safety in industrial environments.

 By choosing HIWACO instruments, you will not only have a device, but a reliable partner in the process of improving your industrial safety.

Choosing the type of gas detector depends on the type and number of gases in your work environment. Single-gas gas meters are suitable for environments with a specific type of gas, and multi-gas gas meters are suitable for environments with several different types of gas.

Portable gas detector is used for measuring in different environments such as tanks and containers. A fixed gas meter is installed in a certain place and is used for permanent monitoring of gases in a certain environment.

The lifespan of gas detectors are different. Temporary gas detectors usually last 1 to 3 years, while permanent ones can last for years with proper maintenance.

To ensure the accuracy of the gas detector, it should be calibrated regularly. Also, periodic inspections and timely replacement of sensors are necessary.

Yes, correct operation of a gas detector and the interpretation of its results require training. Users should be trained on how to use the device, interpret the data, and take action if dangerous concentrations are detected.

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