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Gas Patio Heater Regulator If you're planning on cozying inside the cold winter air with a propane patio heater, it's crucial to understand how to make use of this device. Matthew Griffith, prevention section chief at Montreal's fire department, said shoppers should look for products that are safe to use. The patio heater should be properly connected and there shouldn't be fire-prone material in the vicinity. Pressure Regulator Gas regulators are mechanical devices that we drive by every day in our vehicles and homes without a second thought. Their invention, made 135 years ago changed the way natural gas and propane are used for cooking, heating and welding with oxyfuel. The fundamental purpose of regulators is the same, but there are many variations. The regulator is based on an element that detects pressure, usually a fabric-reinforced dialythm, to regulate a valve plug's position and restrict the flow of gas. The diaphragm is connected to the valve stem with rods that go through the set spring, over the diaphragm and into the valve. This mechanism senses the gas pressure inside the house or pipeline and adjusts the position of the valve plug to meet the demand. As the consumption of gas in the house decreases, the pressure between the regulator and the house reduces as well. The diaphragm deflates downward and the valve plug is moved closer to the orifice in order to limit the flow. As the demand for gas in the house grows the valve will open further and increases the flow of gas. The valve plug is closed until the demand of the house decreases. The valve is then opened to increase the flow. This process is referred to as”sizing” and is the fundamental function of the regulator. As the valve opens it creates pressure in the main chamber which is connected to the outlet port of the hose by venturi tubes. This pressure is regulated by adjusting a screw or handle located on the exterior of the regulator. When the screw is turned counterclockwise it expands and decreases the pressure. However, when it is turned clockwise, it reduces the pressure. When choosing a pressure regulator, remember that the maximum and minimal nominal pressures are determined by commercial standards and NOT the pressure at the supply line. The regulator must be compatible with the hose you are using. Look for a hose that is whistle-free, that has various sizes of rings to prevent resonant sound from accumulating throughout the hose. Thermocouple Thermocouples operate on the premise that different types of metals in contact at their respective ends can generate an electric current, even when they are at very varying temperatures. They are used to determine the temperature difference between two points in a system and convert this data into an electrical signal that can be read by thermocouple meter or another instrument. Thermocouples are superior to other sensors, for instance thermostors. They are able to measure extremely high temperatures and function in corrosive environments. The measuring (or hot) junction is formed by connecting two dissimilar metals at one end, while at the other, the reference (or cold) junction, is kept at a constant temperature. Thermocouples are passive devices, meaning they do not require power to operate. The voltage generated is proportional the temperature difference between the measuring junction and the reference junction. Manufacturers of thermocouples and organizations that provide metrology standards, such as NIST offer reference tables for the function E (T). Displaystyle scriptstyle e(T) for each specific thermocouple type. There are three kinds of thermocouple connections: exposed grounded and welded. The exposed junction style is a bit higher than the protective sheath and offers the fastest response time. In the event of measurements under corrosive conditions it is recommended that a grounded thermocouple be utilized. A thermocouple that is welded is physically separated from the sheath by mgO powder to stop the penetration of gas or moisture that could lead to errors. The thermocouple that is welded is also a benefit in being more resistant to vibration. It is recommended for use in harsh environments and at pressures as high as 3000 psi. A thermocouple that is damaged is usually caused by an insufficient the polarity. If the sheath does not appear to be polarized, the two ends of the thermocouple will have different voltages at the measurement junction, which can cause an incorrect reading and end up damaging the instrument. A malfunctioning thermocouple could be caused by a poorly calibrated or installed sensor. Thermostat In contrast to electric heaters that need to be wired directly into the wall Gas patio heaters are portable and use propane or natural gas cylinders as fuel. Thermostats regulate the flow of energy into these cylinders to ensure that they do not overflow but still provide heat when needed. The thermostat accomplishes this by detecting the temperature of the air that is passing through it. The thermostat can also detect when the room is at a comfortable temperature and turns off the heating. click web page are the most popular. It is controlled by a microcontroller which converts a change in electrical resistance into a reading of temperature. It is able to do this more accurately than older, mercury switch thermostats that used mercury coils with three wires in it that moved according to the temperature. This allowed the thermostat to tilt a switch made of mercury that was connected to an electrical circuit that was used to power a heater or air conditioner, turning it off and on. Another type of thermostat is one that is mechanical. The thermostat is activated when the wax inside the small cylinder begins to melt, which is about 180 degrees F. (Different thermostats have different opening temperatures). A rod that connects to the valve is then pressed into the wax and opens the valve when it's hot. As the room cools, the wax expands and the rod is pulled back into the cylinder, closing the valve. You can set thermostats to change the temperature at different time of the daytime. This can help you save energy by setting your heating to go on and off when you are at work or sleeping, rather than having it on continuously. You can also set your thermostat to come on earlier so that you will arrive home to a comfortable temperature. Thermostats usually include a feature called the heat anticipator, which stops the heating system from turning on too early. This is due to the fact that certain areas of the house reach the desired temperature before the thermostat has even been set. Pilot Light While many modern heating and homes have done away with pilot lights older furnaces and homes still use these devices to ignite gas in the burner chamber. If the pilot light is ever extinguished, it's important to know how to light it in a safe manner. A pilot light produces a small flame that heats a thermocouple, which generates electricity and keeps the gas valve open. If the pilot flame goes out the thermocouple cools down and stops generating electricity, thus closing the gas valve. Pilot lights are found on most natural gas and propane appliances, like water heaters. Relighting a pilot light requires first that you shut off the gas valve at the appliance. Then you need to remove any doors or panels that might be in the way of getting to the pilot light. Follow the instructions on the front of the unit to open the tube for the pilot light. Once you've reopened the pilot then turn the knob of the gas valve back to “on”. Safety is the main reason to keep a pilot light lit. If it's accidentally shut off the gas constantly venting out of the pilot light tube could be accumulating in your home until sparks from a smoking cigarette or static electricity ignites it and causes an explosion. To prevent this, pilot tubes are equipped with an integrated cutoff valve. Aside from the safety concerns the burning of a pilot light also wastes a significant amount of energy. A pilot light burns between $7 and $18 worth of gasoline per month, according to different studies. This wasted fuel also places an additional burden on the air conditioning system during summer use. Pilot lights can attract spiders that can spin webs, and clog the pilot tubes. Finally, a constant flame can release trace amounts of the mercaptan compound that causes the rotten egg odor that is found in natural gas. If you're ever concerned about these issues, consider purchasing a gas fireplace with a remote control or replacing a fireplace with a more efficient, modern design.