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Gas Patio Heater Regulator It's crucial to know how to utilize a propane patio heater if want to stay warm in the cold winter. Matthew Griffith, chief of the prevention section at the Montreal Fire Department, advises that consumers be looking for products that have safety certifications. The patio heater must be properly connected and there shouldn't be materials that could ignite nearby. Pressure Regulator Gas regulators are mechanical appliances that we use in our homes and cars every day without giving them a second glance. Their invention, made 135 years ago, revolutionized the method in which propane and natural gas are used for cooking, heating and oxy-fuel welding. There are many variations in regulator design, but their basic purpose is the identical. The regulator uses a pressure sensing element typically a fabric-reinforced diaphragm to regulate the position of the valve plug, and to limit the flow of gas. The diaphragm is connected to the stem of the valve using a rod that runs through the set spring, over the diaphragm before entering the valve. The gas pressure coming from the house or the pipeline is detected by this mechanism, and it adjusts the position of the valve plug to match it with the demand from the house. As the use of gas in the house decreases the pressure between the regulator and the house also decreases also. The diaphragm deflates downward and the valve plug moves closer to the orifice to stop flow. As the demand in the home increases, the valve opens further and increases the flow of gas. When calor gas patio heater is closed, it is held in place by the set spring force until the house's demand decreases, which opens the valve further to increase the flow. This process is called sizing and it is the primary function of the regulator. When the valve is opened the pressure builds up in the main chamber, which is connected to the hose's outlet port via venturi tubes. The pressure is controlled by the adjustment of a handle or screw on the outside of the regulator. When the screw is turned counterclockwise, it increases and decreases the pressure; when it is turned clockwise, it lowers the pressure. When choosing a pressure regulator be aware that the maximum and minimum nominal pressures are determined by commercial standards and NOT the pressure at the supply line. The regulator should also be compatible with the hose you are using. Look for a hose that is whistle-free, with alternating rings of different sizes to stop resonant sounds from building up throughout the hose. Thermocouple Thermocouples work on the principle that different types of metals in contact with each other at their respective ends can generate the voltage even if they are operating at extremely different temperatures. They are used to identify temperatures that differ between points of a circuit and convert that data into an electronic signal that can be read by a thermocouple gauge or other instrument. Thermocouples are superior to other sensors, such as thermistors. They can detect extremely high temperatures and function in harsh environments. A pair of different metals is joined to one end of the sensor, forming the measuring (aka hot) junction, while the other is kept at a fixed temperature, also known as the reference (aka cold) junction. Thermocouples create small voltages but they are passive devices that don't need power to perform their functions. The voltage produced is proportional to the temperature difference between the measuring junction and the reference junction. Manufacturers of thermocouples as well as organizations that offer metrology standards, like NIST offer reference tables for the function E (T). displaystyle scriptstyle e(T) For each particular type of thermocouple. There are three types of thermocouple junctions- an exposed, grounded, and wire that is welded. The exposed type of junction extends out of the protective sheath, and provides the fastest response. In the event of measurements under corrosive conditions it is recommended that a grounded thermocouple be used. A thermocouple welded to a wire is physically separated from the sheath with mgO powder to stop the penetration of moisture or gas that could cause errors. A welded wire thermocouple also has the added benefit of being more resistant to vibration. It is recommended to use it in extreme environments that have pressures up to 3000 psi. When a thermocouple is damaged, it's usually caused by a lack in polarity. If the sheath hasn't been polarized, both ends of the thermocouple may have different voltages at their junction for measurement. This could result in an inaccurate reading, or even damage the instrument. A sensor that's not properly calibrated or placed in the right place can also result in a malfunctioning thermocouple. Thermostat In contrast to electric heaters that need to be wired directly into the wall Gas patio heaters are portable and utilize propane or natural gas cylinders for fuel. Thermostats regulate the flow of energy to these cylinders so they don't spill over, but they still provide heat when needed. The thermostat senses the temperature of the air passing through it. The thermostat can also detect when the room is at a comfortable temperature and turn off the heating. The most commonly used type of thermostat is a digital one. It makes use of a microcontroller to convert an electrical resistivity into an indication of temperature. It is able to do this more accurately than older mercury switch thermostats that utilized a mercury coil with three wires inside that would move based on temperature. This enabled it to tilt the mercury switch connected to the electrical circuit of an air conditioning or heater unit, and turn it off or on. Another type of thermostat is one that is mechanical. It's tiny cylinders filled with wax that begins to melt at a certain temperature, possibly 180 degrees F (different thermostats open at different temperatures). A rod that connects to the valve then presses into the wax, and opens the valve when it's hot. As the room cools, the wax contracts and the rod is pushed into the cylinder to close the valve. You can also program thermostats to change the temperature at various time of the daytime. garden gas patio heater can reduce energy usage by programming your heating to be turned off and on while you are working, or sleeping, rather than being on all the time. You can also set the thermostat to turn on earlier so that your home will be an ideal temperature when you arrive back from school or work. Thermostats often come with a feature known as the heat anticipator, which prevents the heating system from turning on too early. This is because different parts of the house typically attain the temperature set before the thermostat does. Pilot Light Although many modern heating and homes have eliminated pilot lights older furnaces and homes still use them to light the gas in the chamber for burning. If the pilot light ever extinguished, it's important to know how to relight it safely. A pilot light creates a small flame which heats the thermocouple. The thermocouple produces electricity and keeps the gas valve open. When the pilot flame ceases to burn the thermocouple cools and ceases to produce electricity, thereby closing the valve. Pilot lights are used on a majority of natural gas and propane appliances, including water heaters. To relight a pilot, you must first shut off the gas on the appliance. You will then need to take off any doors or panels that may be blocking the access to the pilot light. Find the pilot light tube and follow the instructions on the back of the appliance for opening it. After you've re-lit your pilot light, return the knob on the gas valve to the “on” position. Safety is the primary reason to keep a pilot light lit. If it's accidentally shut off, the gas that is constantly escaping from the pilot light tube can accumulate in your home until sparks from an smoking cigarette or static electricity ignites it and causes an explosion. To avoid this, the pilot tubes come with an integrated cutoff valve. Aside from the safety concerns the burning of a pilot light also wastes a significant amount of energy. The pilot light consumes between $7 and $18 worth of gasoline each month, according to different studies. The wasted fuel is a bigger burden on the air conditioner during the summer. Another concern with a pilot light is that it could attract spiders, which could spin webs that can clog pilot tubes. A flame that is constant can release tiny amounts of the chemical Mercaptan that is responsible for the rotten-egg smell in natural gas. If you're ever worried about these issues, think about buying a remote controlled gas fire or replacing your old fireplace with a more modern efficient model.