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
All characteristics are measured using the Philips Standard Coil. For definitions of the Philips Standard Coil and the standard MIL 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)
Life expectancy : min. 10⁸ operations with a failure rate of less than 10^-9 with a confidence  level of  90%.

End of life criteria:
   Contact resistance >1W after 2 ms
   Release time > 2 ms (latching or contact sticking)

Loaded conditions (resistive load: 12 V; 4mA; (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 >2W 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
Contact arrangement is normally open; lead finish is tinned; net mass is approximately 190mg; and can be mounted in any position.

Shock
The switches are tested in accordance with "IEC 68-2-27", 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
The switches are tested in accordance with "IEC 68-2-6", 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 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: +125°C.
Note: Temperature excursions up to 150°C 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 ±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 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. 

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