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
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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
End of life criteria:
Besides the standard models, customized products can
also be supplied offering the following options:
! Operate and release ranges to customer
specification
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%.
! Cropped and/or preformed leads
Coils
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.
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.
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.
Mechanical Data
Contact arrangement is normally open; lead finish is
tinned; net mass is approximately 190 mg; and can be
mounted in any position.
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%.
COTO TECHNOLOGY (USA) Tel: (401) 943-2686 / Fax (401) 942-0920
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(Europe) Tel: +31-45-5439343 / Fax +31-45-5427216
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