A gas is a deformable, movable fluid that has no shape and volume. So we need to use a gas detector to detect, the gas is a fluid like a liquid, it can be active and deformable. Unlike liquids, gases can be tightened. If there is no constraint, the gas can diffuse and its volume is not constrained.
First, the detection principle of flammable and toxic gases
Combustible gas means that it can be uniformly mixed with air (or oxygen) within a certain concentration range to form a premixed gas. When a fire source is exploding, a large amount of energy is released during the incineration. So the principle of detecting this gas is the catalytic incineration sensor.
Toxic gases, as the name implies, are gases that cause damage to the human body and can cause poisoning. The principle of toxic gas detection is a dedicated electrochemical sensor, which measures the concentration-volume ratio, and the response is faster and more active.At this time,industrial toxic gas detector may help a lot.
Second, the selection of gas selection alarm
The sensors selected on various types of gas alarms are very sophisticated. Industrial alarms are mostly used for catalytic incineration sensors and electrochemical sensors because of the quantitative measurement required. Industrial gas alarms can be classified into gas alarms and gas detectors according to their application methods. Considering the price factor, electrochemical sensors are generally only used in the case of quantitative measurement of toxic gases. Regarding the occasion of measuring the explosion, the catalytic incineration sensor is generally used because the requirements are not high.
The flammable gas detector is a detector installed in industrial and civil buildings that responds to single or multiple flammable gas concentrations.
The flammable gas detectors that are most frequently used in daily life are two types of catalytic flammable gas detectors and semiconductor flammable gas detectors.
In hotels, hotels, home-making rooms, and other places where gas, natural gas, and liquefied gas are used, semiconductor-type flammable gas detectors are mainly used, and industrial sites that emit flammable gas and combustible steam mainly use catalytic flammable gas detectors.
The catalytic flammable gas detector measures the concentration of combustible gas by using a change in resistance after heating of a refractory metal platinum wire.
When the combustible gas enters the detector, it causes an oxidation reaction (flameless combustion) on the surface of the platinum wire, and the heat generated by the heat causes the temperature of the platinum wire to rise, and the resistivity of the platinum wire changes, so when high temperature is encountered, etc. When the temperature of the platinum wire changes, the resistivity of the platinum wire changes, and the detected data also changes.
The semiconductor type flammable gas detector measures the concentration of combustible gas by utilizing changes in the surface resistance of the semiconductor.
The semiconductor flammable gas detector uses a gas sensitive semiconductor element with high sensitivity. When it is in operation, it encounters a combustible gas, the semiconductor resistance decreases, and the falling value has a corresponding relationship with the concentration of the combustible gas.
The flammable gas detector consists of two parts: detection and detection, with detection and detection functions.
The principle of the detection part of the flammable gas detector is that the sensor of the instrument uses a detecting element and a fixed resistor and a zero-setting potentiometer to form a detection bridge. The bridge uses platinum wire as the carrier catalytic element. After the power is applied, the platinum wire temperature rises to the working temperature, and the air reaches the surface of the component by natural diffusion or other means.
When there is no flammable gas in the air, the bridge output is zero. When the air contains flammable gas and diffuses to the detecting element, the flameless combustion is caused by the catalytic action, the temperature of the detecting element is increased, and the platinum wire resistance is increased. The bridge is out of balance, and thus has a voltage signal output. The magnitude of this voltage is proportional to the concentration of the flammable gas. The signal is amplified, analog-digital converted, and the concentration of the flammable gas is displayed through the liquid display.
The electrochemical gas detector is a gas detector using an electrochemical sensor. Since many gases are electrochemically active, they can be electrochemically oxidized or reduced, and the current generated by this reaction is proportional to the concentration of the reacting gas. Therefore, the composition and concentration of the gas can be detected by such a reaction.
1, the photoelectric photometric detection principle (formaldehyde gas and β-diketone chemical reaction, retettidine derivatives lead to chromaticity changes), high precision.
2, the unique host + colorimetric sensor box planning: the sensor box can be used to puncture the host, or can be used separately as a decentralized sampler (after sampling, then prick into the host to obtain readings), sensitive and convenient, can carry out multiple points at the same time Detection.
3, the sensor box is small and exquisite, and can be reused dozens to hundreds of times.
4. The unique decentralized filter effectively reduces the influence of environmental factors such as temperature and humidity on the detection. It is the most stable formaldehyde gas detector (formaldehyde instrument) on the market.
5. The unit of formaldehyde concentration can be selected: μg/m3 (mg/m3) and ppb (ppm).
6 a variety of detection modes are available: single point direct measurement, sampler multi-point simultaneous measurement, continuous monitoring.
Water quality analyzers are widely used in sewage detection in water plants, food, chemical, metallurgy, environmental protection and pharmaceutical industries. They are commonly used laboratory instruments. Can be used to determine turbidity, color, suspended solids, residual chlorine, total chlorine, combined chlorine, chlorine dioxide, dissolved oxygen, ammonia nitrogen, nitrite, chromium, iron, manganese, copper, nickel, zinc, sulfuric acid Salt, phosphate, nitrate nitrogen, anionic detergent, odor and COD parameters, users can according to their own requirements, the water quality analyzer operating process requirements are:
(1) The prepared reagent should not be too long to be placed in the air for a long time.
(2) After adding the reagent to the water sample, shake well.
(3) analyzing the effective time of pure concentrated sulfuric acid or sulfuric acid,
(4) The temperature of the analyzer should not be too high.
2. The preheating time of the host should be 16-20 minutes before the experiment.
3. When pulling the lever of the measuring instrument, ensure that the cuvette is accurately aligned with the optical path.
4. After the reaction solution is poured into the cuvette, there is a small bubble floating up, which affects the fluctuation of the number, and then reads when the number is stable.
5. For continuous measurement of multiple samples, the solution in the cuvette is removed from the corner, washed with distilled water and carefully cleaned, then the new solution to be tested can be poured, and the error introduced is within the allowable range. Within the measurement, the COD value of the water sample can be made from small to large in order to make the error smaller.
6. When pouring the solution from the cuvette, do not splash the solution on the light-permeable window of the cuvette. Before the colorimetric measurement, check whether the cuvette window is clean. Except for visual inspection, check each colorimetric. The optical density A of the dish is measured for its relative value.
"The best way to protect your family is to install a carbon monoxide detector," says Montgomery, whose company offers furnace and AC installation in Atlanta. Should the alarm go off, get everyone out of the home, open all windows and doors and call 911 if anyone is experiencing symptoms. Even though the cold winter is fading into spring, it's never too early to schedule an appointment to have heating or air conditioning units checked by a professional, and have a carbon monoxide detector installed. Homeowners should not ignore the alarm should it go off as they are designed to alert homeowners before symptoms are felt." CO poisoning has flu like symptoms, making it hard for homeowners to know the difference between the two. Homeowners should be sure they look for one that has a battery backup in case of a power outage. Because carbon monoxide is lighter than air it is typically found with warm, rising air. Babies, children, pregnant women and people with circulatory or respiratory problems are more susceptible to CO poisoning. But carbon monoxide can have lasting effects, and can even result in death. CO detectors should generally be replaced every two years. Never place it near a fireplace or appliance that produces a flame.
According to Montgomery who also offers variety of furnace services it's important to remember that carbon monoxide detectors are designed to protect healthy adults. When installing one, always take into account the age and health of everyone in the home to determine the effectiveness of the detector. Routine maintenance checks can not only save homeowners money on energy bills, they might just save a life. Furnaces and other appliances should be inspected by a professional at least once a year to be Hydrogen Detectors suppliers sure fumes are properly vented and the appliance is working as it should. "Over time, if CO builds up, an alarm will trigger, alerting the homeowner to a problem.Atlanta, Georgia – Warm weather will soon be here, but just because Atlanta homeowners are using their cooling units instead of their gas furnaces doesn't mean they shouldn't be thinking about installing a carbon monoxide detector. Those affected will experience dizziness, headaches, nausea and confusion. In multi-floor homes, a detector should be placed on each floor. "If these appliances malfunction, CO can be leaked into the air of unsuspecting homeowners.
Place it close enough to bedrooms or be sure it has a loud enough alarm that it can be heard even during sleep.
Detectors should be placed on a wall, at least three feet above the floor or on the ceiling. CO poisoning can cause lasting effects, even with mild symptoms. "If homeowners have any appliance in their home that burns gas, oil, wood or charcoal, carbon monoxide is being created," says Phil Montgomery, whose business heating and air conditioning in Atlanta has served the area for more than 40 years." There are several types of detectors that alert in different ways, depending on how the level of carbon monoxide is measured. When Atlanta homeowners call to have their AC unit serviced they should also have any wood, gas or charcoal burning appliances looked at to be sure they are in proper working order. Schedule an appointment with a certified technician to inspect all appliances to determine the source of the leak