EN 521-2019 pdf download.Specifications for dedicated liquefied petroleum gas appliances – Portable vapour pressure liquefied petroleum gas appliances.
— appliances burning butane : gas A at 0.5 bar and gas B at 2 bar;
— appliances burning a butane-propane mix : gas A at 0,5 bar and gas B at 5 bar;
— appliances burning propane gas C at 3 bar and gas B at 9,5 bar.
For each of these supply conditions, the tests shall be carried out with the burners operating individually, and then repeated with the other burners operating with their taps fully open.
The tests shall be carried out with any lid open or closed if the instructions allow this mode of operation. The tests shall be carried out with the aeration adjuster fully open for appliances fitted with a user adjustable aeration adjuster.
The products of combustion are sampled 15 mm after the start of the test.
The quantity of CO2 in the sample shall preferably be greater than 1 % (V/V).
The use of a restrictor is permitted so as to obtain such a quantity of CO2. If it is impossible to obtain a quantity of I % C02, a concentration lower than 1 % may be accepted, but the laboratory shall ensure the reproducibility of the sample taken.
The requirements in 5.26 shall be met.
If the appliance is made of parts to be placed by the user that can be put in a wrong position which is likely to impair its safety the combustion test is repeated with those parts in their worst position.
6.26.2 Stove burners
Stove burners under test are covered by a vessel according to 6.1.4 filled with 2kg of water or with a
special vessel according to 6.5,1.2. No vessel is placed on contact grills or covered burners.
When testing a single burner, the vessel Is covered by a device complying with Figure 11.
When testing burners simultaneously, the appliance is covered with one of the devices complying with Figure 12, chosen according to the shape of the stove in such a way that the quality of combustion is not affected.
6.26.3 Analysis of the products of combustion
For all the tests carbon monoxide is measured with a selective method allowing a concentration of 0,005 % by volume to be detected accurately.
The quantity of CO in the air and water vapour free products (neutral combustion) is given by the following equation:
6.27 Accumulation of un-burnt gases
The requirement of 5.27 is checked by visual examination.
6.28 Safety at high temperature
The appliance, connected to a full gas cartridge or gas cylinder, is placed in a properly ventilated room whose temperature is maintained at (35 ± 3) °C until it reaches thermal equilibrium. It is then lit with all taps In the full on position.
Stove burners are covered by a steel disc of 2 mm in thickness. The diameter of the disk is at least 180 mm. lithe diameter of the pan support is more than 180 mm, then the disk diameter shall be the closest to the largest dimension of the pan support as defined in Table AA.
NOTE I The highest dimension of the pan support is the diameter of the circle centred on the burner circumscribed with the pan support (see examples given in Figure 14).
For the case described in 6.5.1.2. this disc is replaced by the vessel specific to the appliance, three quarters full of water, if this vessel has an external diameter less than 180 mm).
For lighting appliances, mantles are pierced with 5 mm diameter hole. This hole shall be placed so that the flame coming from it is directed towards parts which could be damaged or cause maximum overheating.
Any lid Is closed if the instructions allow this mode of operation.
A pressure recording device is connected either to the gas cartridge or gas cylinder or to the appliance gas circuit situated between the gas inlet and the gas closing point of the tap. The connecting circuit shall not influence the temperature of and the pressure in the gas cartridge and the gas circuit of the appliance.
The appliance is operating at full rate for 30 mm and then shut-off. The pressure inside the gas cartridge or gas cylinder is measured until it drops to ensure that it does not exceed the pressure of the gas contained at 50 °C.
NOTE 2 The pressure of gas at 50 °C inside the gas cartridge or gas cylinder is measured before the test, when the cartridge or gas cylinder is full, for example by maintaining it in a bath of hot water until thermal equilibrium is reached at 50 °C.
Allow the appliance to cool and check for deterioration of the appliance and cartridge, then fit a new gas cartridge or gas cylinder and light the burners.
The appliance is then subjected to the soundness test described in 6,6.1. The requirement of 5.28 shall be met.EN 521-2019 pdf download.
EN 521-2019 pdf download
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