RI-21C

RI-21 Series Dry Reed Switch RI-21 Series Micro dry-reed switch hermetically sealed in a gas-filled envelope. Single-pole, single-throw (SPST) type, having normally open contacts, and containing two magnetically actuated reeds. The switch is of the double-ended type and may be actuated by an electromagnet, a permanent magnet or a combination of both. The device is intended for use in sensors, relays, pulse counters or similar devices. RI-21 Series Features General purpose reed switch High breakdown voltage Contact layers: gold, plated ruthenium Superior glass-to-metal seal and blade alignment Excellent life expectancy and reliability Dimensions in inches (mm) General data for all models RI-21 AT-Customization / Preformed Leads Besides the standard models, customized products can also be supplied offering the following options: ! Operate and release ranges to customer specification ! Cropped and/or preformed leads Coils End of life criteria: Contact resistance > 1Ω after 2 ms Release time > 2 ms (latching or contact sticking). Loaded conditions (resistive load: 12 V; 4 mA; (15 mA peak); operating frequency: 170 Hz) Life expectancy: min. 107 operations with a failure rate of less than 10-8 with a confidence level of 90%. End of life criteria: Contact resistance > 2Ω after 4 ms Release time > 0.7 ms (latching or contact sticking). Switching different loads involves different life expectancy and reliability data. Further information is available on request. Mechanical Data All characteristics are measured using the Philips Standard Coil. For definitions of the Philips Standard Coil, refer to “Application Notes” in the Reed Switch Technical & Application Information Section of this catalog. Life expectancy and reliability The life expectancy data given below are valid for a coil energized at 1.25 times the published maximum operate value for each type in the RI-21 series. No load conditions (operating frequency: 100Hz) Contact arrangement is normally open; lead finish is tinned; net mass is approximately 190 mg; and can be mounted in any position. Life expectancy : min. 108 operations with a failure rate of less than 10-9 with a confidence level of 90%. 110 COTO TECHNOLOGY (USA) Tel: (401) 943-2686 / Fax (401) 942-0920 6 (Europe) Tel: +31-45-5439343 / Fax +31-45-5427216 RI-21 Series Dry Reed Switch Shock The switches are tested in accordance with “IEC 68-227”, test Ea (peak acceleration 150 G, half sinewave; duration 11 ms). Such a shock will not cause an open switch (no magnetic field present) to close, nor a switch kept closed by an 80 AT coil to open. Vibration +125°C. Note: Temperature excursions up to 150°C may be permissible. For more information contact your nearest Coto Technology sales office. Soldering The switches are tested in accordance with “IEC 68-26”, test Fc (acceleration 10G; below cross-over frequency 57 to 62 Hz; amplitude 0.75 mm; frequency range 10 to 2000 Hz, duration 90 minutes). Such a vibration will not cause an open switch (no magnetic field present) to close, nor a switch kept closed by an 80 AT coil to open. Mechanical Strength The switch can withstand soldering heat in accordance with “IEC 68-2-20”, test Tb, method 1B: solder bath at 350 ±10°C for 3.5 ±0.5 s. Solderability is tested in accordance with “IEC 68-2-20”, test Ta, method 3: solder globule temperature 235°C; ageing 1b: 4 hours steam. Welding The leads can be welded. Mounting The robustness of the terminations is tested in accordance with “IEC 68-2-21”, test Ua1 (load 40 N). Operating and Storage Temperature Operating ambient temperature; min: -55°C; max: +125°C. Storage temperature; min: -55°C; max: The leads should not be bent closer than 1 mm to the glass-to-metal seals. Stress on the seals should be avoided. Care must be taken to prevent stray magnetic fields from influencing the operating and measuring conditions. 6 For Most Recent Data, Consult the Coto Technology Website: www.cotorelay.com E-mail: sales@cotorelay.com 111