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Guide for Appliance Recyclers <br />June 2004 <br />Step 3: Disconnect the attached wires and examine the attached switch. The <br />mercury switch typically is made of glass, so the mercury inside is visible. <br />Source., Vermont Agency of Natural Resources, Environmental Assistance Division <br />(www.anr.state.vt.us✓der/ead/mercury/appman. pdr) <br />Step 4: Properly manage the switch in accordance with the section of this guide <br />titled, "HANDLING AND RECYCLING MERCURY SWITCHES." <br />Gas Ranges <br />Gas ranges, ovens, and stoves are ignited using either an electronic ignition system or <br />a pilot light. Most pilot -light ranges have a flame sensor, which contains mercury, to <br />shut off the gas supply to the burner when the pilot light is not burning. The mercury <br />flame sensor is attached to the gas burner, which is located beneath the oven cavity in <br />the broiler pan. <br />The mercury flame sensor is made up of three interconnected parts. <br />® a safety valve sensor probe ("probe"), <br />® a safety valve capillary tube ("capillary"), and <br />• a gas safety valve control ("safety valve"). <br />The probe usually protrudes into the pilot -light area. It is connected to the capillary, <br />which is, in turn, connected to the gas safety valve. The safety valve usually is attached <br />to the rear wall of the broiler pan cavity, where it connects to the base of the gas burner <br />assembly. The mercury is contained in the probe and capillary sections of the flame <br />sensor assembly. To prevent mercury leakage, remove all three components of the <br />flame sensor in one piece. Estimated time to remove a mercury flame sensor is 10 to <br />60 minutes. <br />Gas ranges also have temperature -sensing devices that do not contain mercury. These <br />sensor probes usually are found inside the oven or below the upper burners, where they <br />regulate temperature through wire connections to temperature or oven control knobs. <br />The probes for these devices usually are filled with oil or a sodium/potassium mixture; <br />their capillaries generally are made of non-ferrous metals such as copper. The probes <br />and capillaries of mercury flame sensors, on the other hand, are composed of ferrous <br />metals such as iron or steel. As a general rule, probes made of magnetic metals <br />M <br />