Datasheet

RI-21 Series Dry Reed Switch
RI-21 Series
Micro dry-reed switch hermetically sealed in a gas-lled envelope. Single-
pole, single-throw (SPST) type, having normally open contacts, and contain-
ing two magnetically actuated reeds.
e switch is of the double-ended type and may be actuated by an elec-
tromagnet, a permanent magnet or a combination of both. e 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
▪ RoHS Compliant
Dimensions for RI-21 Series
All Dimension in inches (mm) nominal
General data for all models RI-21
AT-Customization / Performed Leads
Besides the standard models, customized products can also
be supplied oering the following options:
• Operate and release ranges to customer specication
• Cropped and/or performed leads
Coils
All characteristics are measured using the Philips Standard
Coil. For denitions of the Philips Standard Coil, refer to
“Application Notes” in the Reed Switch Technical & Applica-
tion Information Section of this catalog.
Life expectancy and reliability
e 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. 10
8
operations with a failure rate of
less than 10
-9
with a condence level of 90%.
End of life criteria:
Contact resistance > 1Ω after 2 ms
Release time > 2 ms (latching or contact sticking).
Loaded conditions (resistive load: 12V; 4 mA;
(15 mA peak); operating frequency: 170 Hz)
Life expectancy: min. 10
7
operations with a failure rate of
less than 10
-8
with a condence level of 90%.
End of life criteria:
Contact resistance >2Ω after 4 ms
Release time > 0.7 ms (latching or contact sticking).
Switching dierent loads involves dierent life expectancy
and reliability data. Further information is available on
request.
Mechanical Data
Contact arrangement is normally open; lead nish is
tinned; net mass is approximately 190mg; and can be
mounted in any position.
Shock
e 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 eld present) to close, nor a switch kept closed
0.024 max
(Ø0.60)
0.906 ± 0.020
(23.0 ± 0.5)
1.811 ± 0.020
(46.0 ± 0.5)
0.570 max
(14.5)
0.100 max
(Ø2.54)
formerly
USA Tel: +(1)973 777 6900 / Fax: +(1) 973 777 8405 ▪ Belgium Tel: + 32 (0)12 390400
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tinned