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Gas Patio Heater Regulator

If you're looking to cozy with the cold outside with a propane garden patio heater gas heater, it's important to be aware of how to use the appliance. Matthew Griffith, chief of the prevention division at Montreal's Fire Department, suggests that customers be looking for products that have safety certifications.

It's also important to ensure that there are no nearby combustible objects and that the patio heater is securely attached.

Pressure Regulator

Gas regulators are mechanical devices we drive through every day in our cars and homes without giving a second thought. Their invention, which took place 135 years ago, has revolutionized the method in which propane and natural gas are used for heating, cooking, and welding with oxy-fuel. The fundamental purpose of regulators is the same, however there are many variations. The regulator uses a pressure sensing element which is usually a fabric reinforced diaphragm, which controls the position of a valve plug and limit the flow of gas.

The diaphragm is connected to the stem of the valve with rods that run through the set spring and diaphragm, then into the valve. This mechanism senses the gas pressure in the home or pipeline and adjusts the valve plug's position to match the demand. As the consumption of gas in the home decreases, so does the pressure between the regulator and the house. The diaphragm is deflated downward and the valve plug is moved closer to the orifice in order to restrict the flow. As the demand for gas increases in the home the valve opens up more, thereby increasing the flow.

When the valve plug is shut, it is held in position by the spring force until the demand of the house drops, which opens the valve further to increase the flow. This process is known as sizing and it is the fundamental function of the regulator.

As the valve opens it creates pressure up in the main chamber of the regulator, which is connected to the hose outlet port with the venturi tube (see the image). This pressure is regulated by the adjustment of a handle or screw located on the exterior of the regulator. When the screw is turned counterclockwise it expands and decreases the pressure; when it is turned clockwise, it reduces the pressure.

When selecting a pressure regulator, keep in mind that the maximum and minimum nominal pressure is dictated by commercial standards and not the pressure of the gas in the supply line. The regulator must be compatible with your hose. Make sure you choose a hose that is whistle-free. It should have alternating rings with different sizes. This will prevent resonance noises from forming across the length.

Thermocouple

Thermocouples operate on the principle that two dissimilar metals that are in contact at one end generate a voltage potential even if they are at different temperatures. They are used to measure the temperature difference between two points in a system, and convert this data into an electrical signal that can be read by a thermocouple meter or other instrument. Thermocouples possess several advantages over other sensors such as thermistors, which include the ability to detect very high-temperatures and to operate in corrosive environments.

The measuring (or hot) junction is formed by connecting two metals with different properties at one end, and the other end, the reference (or cold) junction, is maintained at an unchanging temperature. Thermocouples create small voltages however, they are passive devices that don't require power to function. The voltage generated is proportional to the temperature difference between the measuring junction and the reference junction. Thermocouple manufacturers and metrology standard organizations like NIST provide reference tables of the function E (T) Displaystyle scriptstyle e(T) for each type of thermocouple.

There are three kinds of thermocouple connections: exposed grounded and welded. The exposed style of junction protrudes from the protective sheath, and offers the fastest response. A thermocouple grounded is recommended for measurements in corrosive environments. A thermocouple welded to a wire is physically separated from the sheath with mgO powder to stop the penetration of gas or moisture that could cause errors.

A welded wire thermocouple also offers the added benefit of being more resistant to vibration. It is recommended to use it in abrasive environments that require pressures up to 3000 psi. A thermocouple that has been damaged is usually the result of a lack in the polarity. If the sheath hasn't been properly polarized, both ends of the thermocouple may have different voltages at their junction for measurement. This can lead to an incorrect reading or damage the instrument. A sensor that isn't properly calibrated or placed in the right place can also result in a malfunctioning thermocouple.

Thermostat

Contrary to electric heaters, which need to be wired directly into the wall, gas patio heaters are portable and utilize natural gas or propane cylinders as fuel. Thermostats regulate flow of energy into these cylinders in order to ensure that they do not overflow, yet still provide warmth when required. The thermostat detects the temperature of the air that passes over it. The thermostat also determines whether the room is at a temperature that is comfortable and turn off the heating.

Digital thermostats are among the most commonly used. It makes use of a microcontroller to convert a fluctuating electrical resistivity into an indication of temperature. It is able to perform this more accurately than older mercury switch thermostats that used a mercury coil with three wires inside that moved based on temperature. This allowed the thermostat to tilt a switch made of mercury that was connected to an electrical circuit to the air conditioner or heater by turning it off and on.

A mechanical thermostat is another type. The thermostat is opened when the wax inside a small cylinder starts to melt, which is approximately 180 degrees F. (Different thermostats have different opening temperatures). When the wax is hot, a rod that is connected to the thermostat opens the valve. As the room cools the wax shrinks and the rod is pushed into the cylinder to close the valve.

You can also program thermostats to change the temperature at various times throughout the day. This allows you to conserve energy by setting your heating to come on and off when you are working or asleep, instead of having it on continuously. You can also set the thermostat to turn on earlier so that your home is at a comfortable temperature when you arrive back from school or work. Thermostats often have an element called the heat anticipator that prevents the heater from turning on too quickly. This is because some parts of the home reach the desired temperature prior to the thermostat is set.

Pilot Light

Many newer homes, heating systems and furnaces have eliminated completely of pilot lights. However older homes still rely on them to ignite gas in the burner chamber. If the pilot light is ever snuffed out, it's vital to know how to relight it safely.

A pilot light generates tiny flames that heat 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 utilized on a majority of propane and natural amazon gas patio heater appliances, including water heaters.

Relighting a pilot light requires that you first turn off the gas patio heater regulator valve on the appliance. You must then take off any doors or panels that might be blocking access to the pilot light. Follow the instructions on the front of the light to open the tube for the pilot light. After you've relit the pilot, turn the knob on the gas valve to "on".

The primary reason to keep a pilot light on is to ensure safety. If it's accidentally extinguished the gas constantly escaping from the pilot light tube can accumulate in your home until sparks from an spark from a cigarette lighter or static electricity ignites it and causes an explosion. To prevent this from happening, the pilot tubes come with a built in cutoff valve.

A pilot light that is constantly burning is not only dangerous however, it also consumes energy. A pilot light burns between $7 and $18 worth of gasoline every month, based on various studies. This waste of fuel also puts more strain on the air conditioning system during summer use. A pilot light can also attract spiders which can spin webs and clog up the pilot tubes. A constant flame can emit small amounts of the compound Mercaptan that is responsible for the smell of rotten eggs that is common in natural gas. If you're concerned about these problems, consider buying a remote controlled gas fire or replacing your fireplace with a new efficient model.