The Characteristics and Functional Capabilities of 4-in-1 Gas Detectors
A combustible gas detector is a device that senses harmful gases and alerts people to the presence of danger. People's work and life safety have been prevented and guaranteed to a certain extent.
The four in one gas detector is controlled by a special type of circuit that measures the detector current at two points. When combustible gas enters the circuit chamber, half of which is warm enough to ignite the gas, it contains a combustion catalyst. When gas burns, the flow of heat and electricity in the current experimental area is altered. This change triggered the alarm device.
The infrared combustible gas detector works in a completely different way. Due to the gas entering the testing chamber, a beam is directed at it. It actually reaches the gas; Half of the gas enters a receiver, while the other returns to the transmitter. The detector measures the intensity of two beams to determine the presence of combustible gases. When the beam is the same, everything is fine, but changes in the intensity of the gas side beam may indicate a problem.
When using gas detectors for toxic gas detection, we must first pay attention to inherent issues such as chemical stability of toxic gases and regulatory levels at relatively high concentrations. Because they rely on air flow rather than active pulling, and the response time of samples is generally slower. The calibration of a four in one gas detector is often difficult and requires special accessories to be converted. It operates in a diffusion mode through flow calibration purposes. In addition, the diffusion equivalence implied by monitoring and calibration through the flow between them is not always well recorded.
Secondly, calibration can be further complicated if adjustments must be made on the control panel, while the gas is applied to the remote diffusion gas detector sensor head. In some applications, there may be interfering gases present. The sample drawing method allows the chemical scrubber to be placed upstream of the sensor to absorb interfering substances. All gas sensors measure partial pressure and actively request that the sensor sample is working at a slightly elevated pressure while the ambient pressure sensor is diffusing. Therefore, the output sensitivity of sample drawing sensors is usually higher than that of diffusion sensors. This may be due to the low regulatory level of many toxic gases. But how many toxic gases will have the necessary characteristics.
The hazards caused by toxic gas leaks in treatment plants are present in many industries, including chemical, oil/gas, power utilities, food and beverage, pharmaceuticals, pulp/paper, and wastewater treatment. Leakage sources usually include pipelines, valves, water tanks, burners, refrigerators, separators, lighting systems, aeration tanks, and other equipment.
There are two main methods for detecting combustible gases: controlled combustion and infrared technology. These methods have their own advantages and disadvantages, although infrared methods are usually safe as a whole. In addition to the four in one gas detector, there is a set of equipment for detecting non combustible and harmful gases.
The four in one gas detector can detect four types of gases, which can be combined in two ways:
Method 1: Four types of gases: one is combustible gas (Ex), one is oxygen (O2), and the other two are toxic and harmful gases (toxicgas).
Method 2: Four types of gases: one is combustible gas (Ex), and the other three can all be toxic and harmful gases (as long as there is no cross induction).
Catalytic combustion sensors are used for combustible gases, while electrochemical sensors are used for oxygen and toxic gases.
According to the number of configured sensors, two types (using two sensors), three types (using three sensors), and four types of gases (using four sensors) can be measured simultaneously. It can also be used to measure only one gas (one sensor), which is relatively expensive. To measure only one gas, a single gas detector KT-603 can be used, which is lower in cost than a four in one gas detector.
