General data for all models RI-27

 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, refer to the Reed Switch Technical & Application Information Section.

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-27 series.

No-load conditions (operating frequency: 100 Hz)
Life expectancy: min.10⁹ operations with a failure rate of less than 2 x 10^-10 with a confidence level of 90%.

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

Loaded conditions (resistive load: 5 V; 100 mA; operating frequency: 125 Hz)

RI-27AAA
Life expectancy: min. 2 x 10⁷operations with a failure rate of less than 10^-8 with a confidence level of 90%.

End of life criteria:
   Contact resistance  >1W after 2.5 ms
   Release time > 1 ms (latching or contact sticking).

RI-27AA; RI-27A
Life expectancy: min. 5x10⁷ operations with a failure rate of less than 0.5x10^-8 with a confidence level of 90%.

End of life criteria:
   Contact resistance>1W after 2.5 ms
   Release time >1 ms (latching or contact sticking).

Loaded conditions (resistive load: 12 V; 4 mA; (15 mA peak); operating frequency: 170 Hz)

RI-27AAA Not applicable.
RI-27AA; RI-27A

Life expectancy: min. 45 x 10⁶ operations (tested up to 50 x 10⁶ operations).

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 100mg; and can be mounted in any position.

Shock
RI-27AA; RI-27A
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 10 G; 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 10 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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