84 coto technology (usa) tel: (401) 943-2686 / fax (401) 942-0920 (europe) tel: +31-45-5439343 / fax +31-45-5427216 RI-90 series micro changeover dry-reed switch hermetically sealed in a gas-filled envelope. single-pole, double-throw (spdt) type, having a normally open and a normally closed contact. the switch 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-90 series features ideal for ate switching & proximity sensors contact layers: ruthenium on gold superior glass-to-metal seal and blade alignment excellent life expectancy and reliability RI-90 series dry reed switch general data for all models RI-90 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 all characteristics are measured using the philips standard coil. for definitions of the philips stan- dard coil, see 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-90 series. no load conditions (operating frequency: 100hz) life expectancy : min. 10 8 operations with a failure rate of less than 2 x 10 -9 with a confidence level of 90%. end of life criteria: contact resistance > 1 ? after 2 ms release time > 2 ms (latching or contact sticking). switching different loads involves different life expect- ancy and reliability data. further information is avail- able on request. operating and storage temperature operating ambient temperature; min: -55c; max: +125c. storage temperature; min: -55c; max: +125c. note: temperature excursions up to 150c may be permissible. for more information contact your nearest coto technology sales office. soldering the switch can withstand soldering heat in accordance with ?iec 68-2-20?, test tb, method 1b:solder bath at 350 10c for 3.5 0.5 s. solderability is tested in accordance with ?iec 68-2-20?, test ta, method 3: solder globule temperature 235c; ageing 1b: 4 hours steam. welding the leads can be welded. dimensions in inches (mm)
85 for most recent data, consult the coto technology website: www.cotorelay.com e-mail: info@cotorelay.com mounting 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. RI-90 series dry reed switch model number RI-90 parameters test conditions units operating characteristics operate range at 10-30 release range at min 5 operate time - (max) (energization) ms 1.0 bounce time (max) (energization) ms 1.5 release time (max) (energization) ms 1.0 resonant frequency (typ.) hz tbd electrical characteristics switched power (max) w 5 switched voltage dc (max) v 175 switched voltage ac, rms value (max) v 125 switched current dc (max) ma 400 switched current ac, rms value (max) ma 280 carry current dc (max) a 0.5 breakdown voltage (min) v 200 contact resistance (initial max) m ? 140 contact resistance (initial typ.) m ? 120 contact capacitance (max) without test coil pf 0.8 insulation resistance (min) rh 45% m ? 10 3
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