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Gas Patio Heater Regulator It's crucial to know how to use a propane patio heater if you want to stay warm in the cold weather. Matthew Griffith, prevention section chief at Montreal's fire department, advised that customers should choose products that are safe to use. It's also crucial to ensure that there aren't any combustible materials in the vicinity and that the patio heater is securely attached. Pressure Regulator Gas regulators are essentially mechanical devices that we use in our cars and homes every day without even giving them a second glance. Their invention, which was created 135 years ago, changed the way natural gas and propane are used for heating, cooking and welding with oxyfuel. There are many variations in regulator design, however their primary purpose is the identical. The regulator uses an element that senses pressure typically a fabric-reinforced diaphragm, which controls the position of the valve plug and restrict the flow of gas. The diaphragm connects to the stem of the valve by a rod which runs through the set spring and diaphragm, then into the valve. The mechanism is able to detect 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 also decreases too. The diaphragm begins to shrink downwards, and it pushes the valve plug closer to the orifice, limiting the flow. As the demand for gas grows in the home the valve will open more, thereby increasing the flow. When the valve plug is shut, it is held in place by the set spring force until the demand of the house decreases, which then opens the valve to increase the flow. This process, referred to as”sizing,” is the primary operation of the regulator. As the valve opens the pressure builds up in the main chamber of the regulator, which is connected to the hose outlet port with the venturi tube (see picture). This pressure is regulated by changing the screw or handle located on the outside of the regulator. When the screw is rotated counterclockwise it increases the pressure. When it is rotated clockwise, it reduces the pressure. When choosing a regulator for pressure be aware that the nominal maximum and minimum pressure is set by commercial standards and not the pressure of the gas in the supply line. The regulator should also be compatible with your hose. Find a hose marked whistle-free. It should have alternating rings of different sizes. This will stop the resonant sounds from building up across the length. Thermocouple Thermocouples work on the principle that different metals in contact with each other at their respective ends can generate an electric current, even when they are operating at extremely different temperatures. They are used to determine temperatures that differ between points of the circuit and convert that data into an electronic signal that can be read by thermocouple gauges or another instrument. Thermocouples are superior to other sensors, like thermistors. They are able to measure extremely high temperatures and function in corrosive environments. A pair of different metals is joined at one end of the sensor, forming the measuring (aka hot) junction, and the other is kept at a fixed temperature, known as the reference (aka cold) junction. Thermocouples create small voltages however, they're passive devices that don't need power to function. The voltage generated is proportional the temperature difference between the measuring junction and the reference junction. The thermocouple manufacturers and organizations that provide metrology standards, like NIST offer reference tables for the function E (T). displaystyle scriptstyle e(T) for each specific thermocouple type. There are three primary types of thermocouple junctions- an exposed, grounded and weld wire. The exposed type of junction extends out of the protective sheath, and provides the fastest response time. For measurements in corrosive conditions the thermocouple must be grounded. be used. A thermocouple that is welded is physically separated from the sheath by using mgO powder. This stops gas or moisture from leaking into the sheath and causing problems. A welded wire thermocouple also comes with the added benefit of being more resistant to vibration. It is recommended to use it in harsh environments that require pressures up to 3000 psi. When a thermocouple is damaged, it's usually caused by a lack of polarity. If the sheath is not correctly polarized, both ends of the thermocouple will have unequal voltages at the junction of measurement, which can cause an inaccurate reading and even cause damage to the instrument. A malfunctioning thermocouple could be caused by an improperly calibrated or installed sensor. Thermostat Contrary to electric heaters, which 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 to these cylinders so that they don't overflow, but they still provide warmth when needed. The thermostat detects the temperature of air passing over it. The thermostat also can tell that the room is at a comfortable temperature and turn off the heating. The most popular type of thermostat is a digital one. It makes use of a microcontroller to convert an electrical resistivity into a temperature reading. It is able to accomplish this much more accurately than the older mercury switch thermostats that used a coil of mercury with three wires in it that moved in accordance with the temperature. This allowed it to tilt a mercury switch connected to the electrical circuit of an air conditioning or heater unit, and turn it on or off. Another type of thermostat is one that is mechanical. The thermostat is opened when the wax in the small cylinder begins to melt, which is about 180 degrees F. (Different thermostats have different opening temperatures). A rod connected to the valve then presses into this wax and opens the valve when it's hot. As the room cools the wax expands and the rod is pushed into the cylinder to close the valve. You can also program thermostats to alter the temperature at different times throughout the day. You can cut down on energy consumption by setting your heating to turn on and off while you are at work, or asleep, instead of having it always on. You can also set your thermostat to turn on earlier so that you can get home to an ideal temperature. Thermostats also often include an option called the heat anticipator that prevents the heater from turning off too early. This is due to the fact that different areas of the house often reach the set temperature before the thermostat does. Pilot Light Many modern heating systems, homes and furnaces are no longer completely from pilot lights. However, older homes still use them to ignite gas in the burner chamber. It's essential to know how to safely relight the pilot light if it ever goes out. patio heater gas cylinder creates 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, closing the gas valve. Pilot lights are utilized in a wide range of propane- and natural gas-powered appliances, such as fireplaces, water heaters, barbecues, grills, furnaces and hot tubs. The process of lighting a pilot light requires that you first turn off the gas valve on the appliance. Then, you have to take out any doors or panels that might hinder accessing the pilot light. Locate the pilot light tube and follow the steps on the back of the appliance for opening it. Once you've switched off the pilot switch, turn the gas valve knob back to “on”. The primary reason to keep the pilot light on is to ensure safety. If you accidentally turn off the pilot light, gas that is constantly escaping from the tube could build up in your house until a spark or static electricity ignites the gas and triggers an explosive explosion. To prevent this from happening, pilot tubes have an integrated cutoff valve. A pilot light that is constantly burning is not only dangerous but also wastes energy. Numerous studies have revealed that a pilot light can burn between $7 and $18 of gas every month. The wasted fuel also puts an additional burden on the air cooling system during summer time. patio heater gas cylinder with the pilot light is that it attracts spiders, which could spin webs that can clog pilot tubes. Finally, a constant flame could release trace amounts the mercaptan compound, which causes the rotten egg odor found in natural gas. If you are ever concerned about these issues, consider purchasing a gas fire with a remote control or replacing an old fireplace with a more efficient, modern-day model.