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Gas Patio Heater Regulator It is important to know how to use a propane patio heater if need to stay warm during the cold winter. Matthew Griffith, chief of the prevention division at the Montreal Fire Department, advises that consumers look for products with safety certifications. It's also important to ensure that there aren't any combustible materials in the vicinity and that the patio heater is correctly attached. Pressure Regulator Gas regulators are essentially mechanical appliances we use in our cars and homes every day without giving them a second thought. Their invention, 135 years ago, has changed the way natural gas and propane are utilized for cooking, heating, and welding with oxy-fuel. The basic purpose of regulators is the same, but there are numerous variations. The regulator utilizes 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 linked to the stem of the valve using a rod that runs through the set spring, over the diaphragm before entering the valve. The mechanism is able to detect the gas pressure inside the house or pipeline and adjusts the valve plug's position to meet the demand. As the consumption of gas in the home decreases as does the pressure between the regulator and the house. patio heater gas causes the diaphragm of the regulator to deflate downward, and it pushes the valve plug closer to the orifice, restricting flow. As the demand for gas in the home increases, the valve opens further and increases the flow of gas. The valve plug remains closed until the demand of the house decreases. This opens the valve to increase the flow. This process is called size and is the primary function of the regulator. When the valve is opened, a pressure is built up in the main chamber of the regulator, which is attached to the outlet port of the hose with a venturi tube (see the image). This pressure is regulated by the adjustment of a handle or screw on the outside of the regulator. When the screw is turned counterclockwise, it raises the pressure. When it is rotated clockwise, it reduces the pressure. When choosing a regulator for pressure, keep in mind that the nominal maximum and minimum pressure is set by commercial standards, not the pressure of the gas at the supply line. The regulator must also be compatible with the hose you are using. Make sure you choose a hose that is whistle-free. It will have alternating rings of different sizes. This will stop the resonant sounds from building up across the length. Thermocouple Thermocouples are based upon the principle that two dissimilar metals that are in contact at one end produce a voltage even when they are at extremely different temperatures. They are used to identify temperatures that differ between points of an electrical circuit and convert that information into an electronic signal that can be read by thermocouple gauges or another instrument. Thermocouples possess several advantages over other sensors like thermistors, for instance, the ability to measure extremely high temperatures and to function in harsh environments. The measuring (or hot) junction is created by connecting two metals with different properties at one end, and at the other, the reference (or cold) junction, is kept at the same temperature. Thermocouples produce small voltages, but they are passive devices that do not require power to perform their functions. The voltage generated is proportional to the difference in temperature between the reference and measuring junctions. Manufacturers of thermocouples and organizations that offer metrology standards, such as NIST provide reference tables for the function E (T). Displaystyle scriptstyle e(T) For each type of thermocouple. There are three types of thermocouple connections: exposed, grounded and weld. The exposed type of junction extends out of the protective sheath and has the fastest response. A thermocouple that is grounded is recommended for measurements in corrosive environments. A thermocouple that is welded is physically insulated from the sheath using mgO powder to prevent the penetration of moisture or gas 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 up to 3000 psi. A thermocouple that has been damaged is usually caused by an insufficient polarity. If the sheath isn't correctly polarized, both ends of the thermocouple have different voltages at the junction of measurement that could lead to an inaccurate reading and possibly cause damage to the instrument. A malfunctioning thermocouple could result from an incorrectly installed or calibrated sensor. Thermostat Unlike electric heaters which have 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 required. The thermostat detects the temperature of the air that passes 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 utilizes a microcontroller that converts a changing electrical resistance into a measure of temperature. It can do this much more accurately than earlier mercury switch thermostats which used a coil of mercury that had three wires that would move depending on the temperature. This allowed the thermostat to tilt a switch made of mercury that was connected to an electrical circuit to an air conditioner or heater switching it on and off. Another type of thermostat is a mechanical one. The thermostat opens when the wax inside a small cylinder starts to melt, which is around 180 degrees F. (Different thermostats have different opening temperatures). A rod that is connected to the valve is then pressed into this 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, thereby shutting the valve. You can also program thermostats to alter the temperature at various times during the daytime. You can save energy by setting your heating to turn on and off while you are working, or sleeping, rather than being running all the time. You can also set your thermostat to turn on sooner to ensure that you arrive home to an ideal temperature. Thermostats usually come with a feature known as the heat anticipator, which stops the heater from turning on too early. This is due to the fact that different areas of the home often reach the set temperature before the thermostat itself does. Pilot Light While many newer heating and home systems have eliminated pilot lights, older homes and furnaces still use them to ignite gas in the chamber for burning. If the pilot light is ever extinguished, it's important to know how to relight it in a safe manner. A pilot light creates tiny flames that heat the thermocouple. This produces electricity and keeps the gas valve open. When the pilot flame ceases to burn, the thermocouple cools down and stops producing electricity, closing the valve. Pilot lights are found on the majority of propane and natural gas appliances, such as water heaters. To relight a pilot light, you first need to shut off the gas at the appliance. You will then need to take out any doors or panels that might be blocking access to the pilot light. Find the pilot light tube and carefully follow the instructions on the front of the appliance for opening it. After you've re-lit your pilot light, return the gas valve knob to the “on” position. The primary reason to keep a pilot light on is for safety reasons. If you accidentally turn off the pilot light, the gas that is constantly escaping from the tube could accumulate in your house until an electric spark or static charge ignites the gas and triggers an explosive explosion. Pilot tubes are designed to contain an inbuilt cutoff valve to prevent this from happening. gas patio heater burning pilot light is not just hazardous, but it also wastes energy. Different studies have proven that a pilot light can consume between $7 and $18 of gas each month. The wasted fuel also puts an additional burden on the air cooling system in summer. Another concern with a pilot light is that it could attract spiders, which can spin webs that clog the pilot tubes. Also, a constant flame can emit trace amounts of the mercaptan compound that produces the rotten egg smell that is present in natural gas. If you're ever concerned about these issues, think about buying a remote-controlled gas fire or replacing a fireplace with a more efficient, modern model.