Condensed Water From Commercial Laundry Dryers are Controlled by Reed Sensor REED RELAYS REED SENSORS REED SWITCHES Introduction Commercial laundry operations have several washer and dryer units to typically handle several customers at once. The dryers by their very nature dry the wet clothes by heating them with gas or electricity. The water is vaporized and must then be carried out of the dryer compartment to rid the moisture. Most times it’s not convenient to simply vent the vapor directly to the outside air. MEDER’s reed sensors play a direct role in solving this problem. Figure 1. MK17-x-3 physical layout Features • Magnet and Reed Sensor are isolated and have no physical contact by typically having the magnet mounted to a float and the Reed Sensor is mounted on the body of the casing close to the high point of the water and positioned to accurately pick up the magnetic field from the magnet in the float. Figure 2. Condensation line drains into a reservoir with built in pump containing a level sensor. • The reed switch used in the Reed Sensor is hermetically sealed and is therefore not sensitive to rough, wet, moist environments • The magnet is not affected by its environment • Tens of millions of reliable operations • Surface mount and through hole packages available • Cylindrical hole and screw fastening mounting • Contacts dynamically tested Applications • Ideal for sensing the water level in commercial clothes dryers • Ideal for applications sensing any kind of liquid level in a host of different configurations Figure 3. When the condensation reaches a high level the reed switch activates a pump which drains the water. Condensed Water’s Max Max Limit in Commercial Clothes Dryers is Sensed by Reed Sensors Commercial laundromats are used extensively around the world and are typically open 24 hours a day. Multiple commercial clothes dryers are constantly in use. Because most of the time it is inconvenient to vent the water vapor generated in the clothes dryer directly to the outside air, the vapor is passed through a condenser. The condenser condenses the water vapor into a storage tank. The water level in then monitored using reed sensors. MEDER electronic Application MEDER electronic AG | Germany | tel.: +49(0)7731/8399-0 | Email: [email protected] MEDER electronic Inc. | USA | tel.: +1 508.295.0771 | Email: [email protected] Page 1 of 3 www.meder.com Condensed Water From Commercial Laundry Dryers are Controlled by Reed Sensor REED RELAYS REED SENSORS REED SWITCHES Specifications Operate specs Min Max Units Must close distance 5 25 mm Must open distance 5 25 mm Hysteresis Load Characteristics Switching voltage Switching current Carry current Contact rating Static Contact resistance Dynamic contact resistance Breakdown voltage Operate time Release time Operate Temp (MK6) Storage Temp (MK6) Operate Temp (MK15) Storage Temp (MK15) Typical 50% Min Max Units 200 0.5 1.5 10 150 200 320 -20 -35 -20 -35 0.5 0.1 85 85 130 130 Volts Amps Amps Watts mΩ mΩ Volts msec msec °C °C °C °C A magnet is generally mounted in a float that rides up and down with the water level in the storage tank or reservoir. As the water level reaches the upper limit, MEDER’s reed sensor, which is conveniently positioned near the top of the reservoir, will sense this high water mark. Once this high water level is reached the reed sensor will switch on a water pump, allowing water to be emptied automatically, pumping directly into a water drain system. Having a pump that only turns on when the storage tank is full is very energy efficient, compared to having the pump running all the time. The reed sensor is an excellent choice because it can operate reliably over a wide temperature range, and represents an economical way to carry out the sensing function. Because MEDER’s sensors use hermetically sealed reed switches that are further packaged in strong high strength plastic, they can be subject to rough treatment and environmental concerns such as spillage water, and moisture without any loss of reliability. MEDER’s sensors are packaged for surface mounting as well as through hole mounting. Also, MEDER has cylinder packages and well as screw fastening packages having lead wires for remote attachment to the electronics. Surface Mount Series Series MK15 MK16 MK17 MK22 MK23MK23-35 MK23MK23-66 MK23MK23-87 MK23MK23-90 Dimensions Dimensions mm W 2.5 H 2.5 L 19.50 W 2.3 H 2.3 L 15.60 W 2.1 H 2.1 L 9.61 W 2.7 H 2.3 L 15.60 W 2.2 H 1.95 L 15.75 W 2.2 H 2.7 L 19.60 W 2.0 H 2.1 L 15.60 W 2.54 H 3.05 L 24.9 Illustration inches 0.098 0.098 0.768 0.091 0.091 0.614 0.083 0.083 0.378 1.060 0.091 0.614 0.087 0.077 0.620 0.087 1.060 0.772 0.079 0.083 0.614 0.100 0.120 0.980 MEDER electronic Application MEDER electronic AG | Germany | tel.: +49(0)7731/8399-0 | Email: [email protected] MEDER electronic Inc. | USA | tel.: +1 508.295.0771 | Email: [email protected] Page 2 of 3 www.meder.com Condensed Water From Commercial Laundry Dryers are Controlled by Reed Sensor REED RELAYS REED SENSORS REED SWITCHES Through Hole Series Series MK06MK06-4 MK06MK06-5 MK06MK06-6 MK06MK06-7 Dimensions mm W 3.3 H 3.3 L 12.06 W 2.8 H 3.2 L 14.30 W 3.3 H 4.2 L 17.24 W 3.3 H 4.2 L 19.78 Illustration inches 0.130 0.130 0.475 0.110 0.126 0.563 0.130 0.165 0.679 0.130 0.165 0.779 Cylindrical Panel Mount Series Series MK03 MK03 Dimensions mm Dia 5.25 L 25.5 Illustration inches 0.207 1.004 MK14 MK14 Dia L 4 25.5 0.157 1.004 MK18 MK18 Dia L 5 17 0.197 0.669 MK20/1 MK20/1 Dia L 2.72 10 0.107 0.394 Rectangular Screw Flange Mount Series Series MK04 MK05 MK05 MK12 MK12 Dimensions mm W 13.9 H 5.9 L 23.0 W 19.6 H 6.1 L 23.2 W H L 14.9 6.9 32.0 Illustration inches 0.547 0.232 0.906 0.772 0.240 0.913 0.587 0.272 1.260 **Consult our factory for your specific design requirements. ** MEDER electronic Application MEDER electronic AG | Germany | tel.: +49(0)7731/8399-0 | Email: [email protected] MEDER electronic Inc. | USA | tel.: +1 508.295.0771 | Email: [email protected] Page 3 of 3 www.meder.com