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Gas Patio Heater Regulator If you're planning to warm up in the cold outdoors with a propane patio heater, it's crucial to understand how to use this appliance. Matthew Griffith, chief of the prevention section at the Montreal Fire Department, says that shoppers should look for products that have safety certifications. It's also crucial to ensure that there aren't any combustible materials in the vicinity and that the patio heater is properly connected. Pressure Regulator Gas regulators are mechanical appliances that we use in our homes and cars every day without giving them a second thought. Their invention made 135 years ago has revolutionized how natural gas and propane are used for heating, cooking and welding using oxyfuel. There are many variations in the design of regulators, however their primary function is the identical. The regulator utilizes an element that detects pressure, usually a fabric-reinforced dialythm to control a valve plug's position and limit gas flow. The diaphragm is linked to the stem of the valve using rods that run through the set spring, over the diaphragm before entering 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 use of gas in the house decreases and the pressure between the regulator and the house decreases as well. The diaphragm is deflated downward and the valve plug moves closer to the orifice to stop the flow. As the demand for gas in the home increases, the valve opens further and increases the flow of gas. When the valve plug is closed it is held in position by the spring force until the demand from the house drops, which opens the valve to increase flow. This process is called”sizing” and is the primary 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 via a venturi tube. This pressure is controlled by changing the 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 lowers the pressure. When choosing a pressure regulator be aware that the maximum and minimal nominal pressures are set by commercial standards, and not the pressure at the supply line. The regulator must be compatible with the hose you are using. Choose a hose which is labeled as whistle-free, which will feature different sized rings that alternate to prevent resonant sounds from building up across the length of the hose. Thermocouple Thermocouples are based on the idea that different types of metals in contact at their ends can generate the voltage even if they are at wildly different temperatures. They are used to measure the temperature differences between two points in a system and transform this information into an electrical signal that can then be read by a thermocouple meter or other instrument. Thermocouples are superior to other sensors, for instance thermistors. They are able to measure extremely high temperatures and operate in corrosive conditions. The measuring (or hot) junction is created by connecting two dissimilar metals at one end, and the other end, known as the reference (or cold) junction, is maintained at an unchanging temperature. Thermocouples produce small voltages, however, they are passive devices that don't need power to perform their functions. The voltage produced is proportional to the temperature difference between the reference and measuring junctions. The thermocouple manufacturers and organizations that offer metrology standards, for example NIST, provide reference tables for the function E (T). displaystyle scriptstyle e(T) for each specific thermocouple type. There are three main types of thermocouple junctions: an exposed, grounded, and welded wire. The exposed type of junction extends out of the protective sheath and provides the fastest response. For measurements in corrosive conditions, a grounded thermocouple should be used. A thermocouple that is welded is physically insulated from the sheath by mgO powder to stop the penetration of moisture or gas that could lead to errors. The thermocouple that is welded also has the added benefit of being more resistant to vibration. It is recommended for use in harsh environments and with pressures up to 3000 psi. When a thermocouple is damaged, it's usually caused by a lack of the polarity. If the sheath does not appear to be correctly polarized, both ends of the thermocouple will have different voltages at the junction of measurement that could lead to an inaccurate reading and even end up damaging the instrument. A malfunctioning thermocouple could be caused by a poorly calibrated or installed sensor. Thermostat Gas patio heaters in contrast to electric heaters that are hardwired to the wall, are portable and run on natural gas or propane. Thermostats control the flow of energy to these cylinders, so they don't spill over, however they can still provide heat when required. The thermostat is able to detect the temperature of air passing over it. The thermostat also can tell when the room is at a comfortable temperature and turns off the heating. Digital thermostats are the most common. It makes use of a microcontroller to convert an electrical resistance into an indication of temperature. It can perform this more accurately than the older mercury switch thermostats, which employed a mercury coil with three wires in it that would move based on temperature. This allowed it to tilt a mercury switch connected to the electrical circuit of the air conditioning or heater unit, turning it off or on. Mechanical thermostats are another kind. The thermostat is activated when the wax contained in a small cylinder starts to melt, which is about 180 degrees F. (Different thermostats have different opening temperatures). When the wax is hot, a rod attached to the thermostat opens the valve. As the room cools, the wax contracts and the rod gets pulled back into the cylinder, thereby shutting the valve. There are thermostats that can be programmed to change at different times during the day. This allows you to save energy by setting your heating to come off and on during times of work or sleeping, rather than having it on constantly. You can also set the thermostat to turn on earlier, so that your home is an ideal temperature when you return from work or school. Thermostats are also usually equipped with an option called the heat anticipateor which stops the heater from switching off too early. This is because parts of the house typically attain the temperature set before the thermostat itself does. Pilot Light Although many modern heating and homes have done away with pilot lights, older homes and furnaces still use them to light the gas in the chamber for burning. If the pilot light is ever extinguished, it's important to know how to light it safely. A pilot light creates tiny flames that heat the thermocouple. The thermocouple generates electricity, and keeps the gas valve open. If the pilot flame goes out, the thermocouple cools and ceases to produce electricity, closing the gas valve. Pilot lights are found in most natural and propane-fueled appliances, including fireplaces, water heaters, barbecues, grills, furnaces and hot tubs. Relighting a pilot light requires first that you shut off the gas valve in the appliance. Then you need to remove any doors or panels that may be blocking accessing the pilot light. Follow the instructions on the front of the unit to open the tube for the pilot light. Once you've re-lit the pilot light, return the knob on the gas valve to the “on” position. The primary reason to keep the pilot light on is to ensure safety. If you accidentally shut off the pilot light, the gas that is constantly escaping from the tube could accumulate in your home until an electric spark or static charge sparks the gas, causing an explosive explosion. To prevent this, the pilot tubes come with a built in cutoff valve. Aside from the safety concerns the burning of a pilot light also wastes an enormous amount of energy. patio outdoor gas heater can burn between $7 and $18 worth of gas every month, based on various studies. This waste of fuel also puts more strain on the air cooling system in summer. Another issue with the pilot light is that it could attract spiders, which can spin webs that can clog pilot tubes. Finally, a constant flame can emit trace amounts of the compound mercaptan, which produces the rotten egg smell that is present in natural gas. If you're worried about these issues, think about buying a remote controlled gas fire or replacing your old fireplace with a new efficient and efficient model.