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Facts you should know about Gas Detection using catalytic principle
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Updated on: 10:51 AM - 27 Jan 17       Posted on: 10:51 AM - 27 Jan 17

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technosavvy says "Facts you should know about Gas Detection using catalytic principle"
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Vikas Dattatraya Sawant multitude of complaints about gas detection instruments, much of these issues are caused by high humidity and the inability for the sensors to provide accurate readings. Selection of gas detection should be made by someone who is qualified and experienced. Much of the time the procurement of equipment is decided on price. SENSOR TECHNOLOGY Catalytic Combustible Gas Sensors .These sensors look for explosive atmospheres. They detect combustible gases by causing an actual combustion of gases within the sensor chamber. Catalytic sensors offer good linearity, and can react to most combustible gases. However, as resistance change to %LEL is quite small, they work better in concentrations between 1,000 and 50,000 PPM. They do not measure trace amounts of gas (under 200 PPM) and therefore are of no use in determining toxic levels. The disadvantages are They must have a minimum of 14% oxygen content in the air to work accurately The sensor can be damaged by silicones, dust,oils lead or other poisons The readings can be affected by humidity and water vapour condensation They respond poorly to low energy hydrocarbons such as oil vapours, kerosene, diesel fuel and commercial jet fuels They tend to loose their linearity after a year or so They are not recommended for use in an acetylene atmosphere The flame arrestor will prevent ignition of most gases except acetylene outside the sensor. It is extremely important to check the approvals for which type of hazardous locations the detector can function in. CALIBRATION Gas sensors start losing accuracy soon after they are manufactured as a normal result of exposure to air and other gases. The loss of accuracy is called “sensor drift. “Older sensors and those that have been exposed to high concentrations of their target gas (the gas that the sensor is designed to detect) have greater sensor drift. Calibration is one way to compensate for sensor drift. During the calibration, a sensor is exposed to a specific concentration of target gas. Because of sensor drift, the amount of gas the sensor detects will differ from the amount of target gas to which the sensor was actually exposed. calibration determines the difference and adjusts the instrument readings up or down to compensate. Regular calibration is necessary to ensure accurate readings Most manufacturers recommend that their gas sensors be calibrated monthly and after a significant gas exposure. Check your operations manual for the recommended operations calibration schedule.
7 months ago

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Updated on: 03:46 PM - 07 Nov 16       Posted on: 03:44 PM - 07 Nov 16

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technosavvy says "One of the most difficult parameters to validate accurately is the moisture content of gases."
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Vikas Dattatraya Sawant Customers often rely on calibration gases in cylinders to verify the performance of instruments. Deciding whether the instrument passes or fails should be a simple review of uncertainty claims. In reality, deciding which depends on far more than simply comparing uncertainty tolerances stated on the cylinder or the instrument under test. One of the most difficult parameters to validate accurately is the moisture content of gases. Water's polar nature and its obvious abundance in the environment, effectively makes it sticky. This reluctance to release from surfaces gives rise to hysteresis or memory effects, that can be as large as 500%.
9 months ago

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Updated on: 11:02 AM - 27 Sep 16       Posted on: 11:02 AM - 27 Sep 16

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technosavvy says "fire and gas detector mapping is key to improved safety in oil and gas facilities"
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Vikas Dattatraya Sawant Fixed fire and gas detection systems in processing facilities typically ensure that risk mitigation systems such as isolation, blowdown and active fire protection are activated in the event of a hazardous event. A well-designed system provides an appropriate level of detector redundancy to guard against false trips and detector faults. Fire and gas detector mapping studies provide an objective analysis of detector layouts to support the design process and optimise the number of detectors needed to meet coverage targets.
11 months ago

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Updated on: 03:21 PM - 19 Sep 16       Posted on: 03:20 PM - 19 Sep 16

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technosavvy says "Determining Why Worksite Gas Sensors are Providing Inaccurate Results"
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Vikas Dattatraya Sawant Properly functioning gas detector are a vital part of any facility’s safety and health policy. This is especially true when one considers the dangers posed by an undetected buildup of flammable gas, which can often result in fires or explosions that can damage or destroy the entire facility. For this reason, determining why a gas detector is not giving accurate readings is a core part of any comprehensive workplace safety plan. If a gas detector is not giving accurate readings, it is a clear danger to the facility and employees alike, in addition to the potential legal issues that might arise. However, it is important to determine why the detector is not giving accurate results in order to find an effective counter for the issue. Poor Placement In order to be effective, a gas detector has to be placed in such a way that the atmosphere surrounding it is characteristic of the entire area it is intended to protect. Poor placement can defeat this goal. For example, placing a detector adjacent to a door could see it giving an inaccurate reading due to the mixing of the room’s air with that of the exterior spaces. Equally, placing a detector next to an area where flammable gas is commonly emitted might see it giving higher than normal readings for the chamber. Because of this, gas detectors should be placed in areas where they will be exposed to the average levels of gas, rather than regions prone to extremes in either direction. Poor Calibration A vital part of installing and maintaining gas sensors is their proper calibration. Properly calibrated sensors are not simply accurate in their own right; they can contribute to the overall information about the facility that is generated by the gas sensor network. For this reason, every sensor must be regularly calibrated and employees should be trained and evaluated on their ability to properly calibrate all the sensor types that will be used at the facility. In addition to its other benefits, regular calibration of sensors can assist the facility in detecting sensors that are in need of replacement. Finding out that multiple sensors, especially newly installed ones, are giving inaccurate reading is often a sign that the company’s calibration policies are in need of review. Poor Maintenance Improper or deferred maintenance is often the unsung villain when a major malfunction occurs at the worksite. It is vital that a regular schedule of sensor maintenance be maintained and that sensors that do not pass the inspection be promptly repaired or replaced. Furthermore, should there be an unexpected spike in the number of sensors requiring repair or replacement, management should immediately determine the underlying causes. In some cases, these issues can be the first sign of more serious malfunctions within the facility. A gas detector is the first line of defense against the potential dangers posed by toxic or flammable gas. By ensuring that the facility’s detector network is properly functioning, the potential danger to the physical plant, facility employees and the surrounding community can be eliminated. For that reason, the maintenance of any gas detectors should always be considered a top priority by the management and their employees alike.
11 months ago

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Customised Sampling Systems
TechnoSavvy designs and manufactures a complete line of liquid samplers, gas samplers, ambient air samplers and sample coolers. These systems sample toxic and/or volatile organic chemicals and process streams, and prevent the escape of emissions into the atmosphere.
Our Sampling System unit performs these tasks while safely obtaining representative and contamination-free samples. All sampling systems - whether gas...
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