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Gas Patio Heater Regulator If you're looking to cozy inside the cold winter air with a propane patio heater, you need to be aware of how to make use of this device. Matthew Griffith, chief of the prevention section at Montreal's Fire Department, suggests that customers look for products that have safety certifications. The patio heater needs to be securely attached and there shouldn't be combustible material nearby. Pressure Regulator Gas regulators are mechanical devices that we use in our vehicles and homes every day without giving them a second thought. Their invention, made 135 years ago, revolutionized the way natural gas and propane are used for heating, cooking, and welding with oxy-fuel. The fundamental function of regulators is the same, however there are numerous variations. The regulator is based on an element that senses pressure, usually a dialythm made of fabric, to control a valve plug's position and limit gas flow. The diaphragm connects to the stem of the valve using rods that go through the set spring, through the diaphragm before entering the valve. The gas pressure coming from the pipeline or the house is sensed by this mechanism and it adjusts position of the valve plug to match it with the demand from the house. 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 to limit flow. As the demand for gas in the house increases, the valve opens further, increasing the flow of gas. When the valve plug is shut, it is held in place by the set spring force until the demand from the house drops, which opens the valve further to increase flow. This process, referred to as”sizing,” is the basic operation of the regulator. When the valve is opened it creates pressure up in the main chamber of the regulator, which is attached to the port for hose outlet with a venturi tube (see image). This pressure is regulated by adjusting a screw or handle on the outside of the regulator. When the screw is turned counterclockwise, it moves up and reduces the pressure. When it is turned clockwise, it reduces the pressure. When you are choosing a regulator for your pressure, remember that the maximum and minimal nominal pressures are established by commercial standards, and not the pressure at the supply line. The regulator should be compatible with the hose you use. Find a hose marked whistle-free. It will have alternating rings of different sizes. This will stop the resonant sounds from building up along the length. Thermocouple Thermocouples operate on the premise that different metals in contact with each other at their ends can produce the voltage even if they are operating at extremely different temperatures. They are used to detect temperatures that differ between points of a circuit and convert that data into an electronic signal that can be read by thermocouple gauges or any other instrument. Thermocouples are superior to other sensors, like thermistors. They can detect extremely high temperatures and function in corrosive conditions. 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 maintained at a constant temperature. Thermocouples are passive devices, which means they do not require power to operate. The voltage generated is proportional to the temperature difference between the measuring junction and the reference junction. The thermocouple manufacturers and organizations that provide metrology standards, for example NIST offer reference tables for the function E (T). displaystyle scriptstyle e(T) For each specific type of thermocouple. There are three main kinds of thermocouple junctions: an exposed, grounded and welded wire. The type of junction that is exposed extends out of the protective sheath, and provides the fastest response. For measurements in corrosive conditions, a grounded thermocouple should be utilized. A thermocouple that is welded is physically separated from the sheath by using mgO powder. This prevents gas or moisture from entering and causing problems. The thermocouple welded wire also has the added benefit of being more vibration resistant. It is recommended for use in harsh environments and at pressures as high as 3000 psi. If a thermocouple is damaged, it is usually caused due to a lack of polarity. If the sheath isn't properly polarized, the two ends of the thermocouple will have unequal voltages at the junction of measurement, which can cause an inaccurate reading and possibly damage the instrument. A malfunctioning thermocouple could be caused by an improperly calibrated or installed sensor. Thermostat Gas patio heaters in contrast to electric heaters that are wired to the wall they are portable and operate on natural gas or propane. The thermostats regulate the flow energy to these cylinders so that they don't overflow but they still provide heat when required. The thermostat is able to detect the temperature of the air passing over it. The thermostat also determines if the room has been cooled to a comfortable temperature and shuts off the heating. The most popular type of thermostat is a digital one. It is controlled by a microcontroller which converts a changing electrical resistance into a measurement of temperature. It is able to perform this more accurately than the older mercury switch thermostats, which utilized 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, and turn it on or off. gas fired patio heaters of thermostat is a mechanical one. The thermostat is activated when the wax inside a small cylinder starts to melt, which is approximately 180 degrees F. (Different thermostats have different opening temperatures). A rod that is connected to the valve presses into this wax and opens the valve when it's hot. As the room cools, the wax contracts and the rod gets pulled back into the cylinder, shutting the valve. You can set thermostats to change the temperature at different times during the day. You can cut down on energy consumption by programming your heating system to be turned off and on while you're at work 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 work or school. Thermostats are also usually equipped with an element known as the heat anticipator, which prevents the heater from turning on too soon. This is because parts of the home often reach the set temperature before the thermostat does. Pilot Light Many modern heating systems, homes, and furnaces have eliminated completely of pilot lights. However older homes still make use of them to ignite gas in the burner chamber. If the pilot light ever shut off, it's crucial to know how to relight it in a safe manner. A pilot light generates a small flame that heats the thermocouple. This produces electricity and holds the gas valve open. If the pilot flame goes out the thermocouple cools down and ceases to generate electricity, closing the gas valve. Pilot lights are utilized on the majority of natural gas and propane appliances, including water heaters. The process of lighting a pilot light requires that you first turn off the gas valve at the appliance. Then, you have to take out any doors or panels that could hinder accessing the pilot light. Locate the pilot light tube and carefully follow the instructions on the front of the appliance to open it. Once you've re-lit the pilot light, return the gas valve knob to the “on” position. The primary reason to keep the pilot light on is for safety reasons. If it's accidentally shut off the gas constantly escaping from the pilot light tube may build up in your home until sparks from a spark from a cigarette lighter or static electricity ignites it and triggers an explosion. The tubes designed for pilots have a built-in cutoff valve to stop this from happening. Aside from the safety concerns the burning of a pilot light is also an enormous amount of energy. Different studies have proven that a pilot light can burn between $7 and $18 of gas per month. This wasted fuel puts a heavier burden on the air conditioner in summer. Another issue with pilot lights is that it attracts spiders, who can create webs that block the pilot tubes. A flame that is constant can release trace quantities of the compound Mercaptan, which is the cause of the smell of rotten eggs in natural gas. If you're worried about these issues, you should consider buying a remote controlled gas fireplace or replacing your fireplace with a modern, efficient model.