96 COTO TECHNOLOGY (USA) Tel: (401) 943-2686 / Fax (401) 942-0920 6 (Europe) Tel: +31-45-5439343 / Fax +31-45-5427216
RI-29 Series Dry Reed Switch
RI-29 Series
Pico dry-reed switch hermetically sealed in a gas-filled glass
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 relays or similar devices.
RI-29 Series Features
Can handle up to 20 W load
Contact layers: Gold, copper, sputtered ruthenium
Superior glass-to-metal seal and blade alignment
Excellent life expectancy and reliability
General data for all models RI-29
AT-Customization / Preformed Leads
Besides the standard models, customized products
can also be supplied offering the following options:
! Operate and release ranges to customer specifica
tion
! 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 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-29 series.
No-load conditions (operating frequency: 100 Hz)
Life expectancy: min. 2 x 108 operations with a
failure rate of less than 10-9 with a confidence level of
90%.
End of life criteria:
Contact resistance > 1Ω after 2ms
Release time > 2ms (latching or contact sticking).
Loaded conditions (capacitive load: 80 V; 0.1 mA;
(700 mA peak); operating frequency: 100 Hz)
RI-29AA
Life expectancy: min. 107 operations with a failure
rate of less than 2 x 10-8 with a confidence level of
90%.
End of life criterion:
Release time > 2 ms (latching or contact sticking).
RI-29A
Life expectancy: min. 2 x 107 operations with a
failure rate of less than 10-8 with a confidence level of
90%.
End of life criterion:
Release time > 2 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 100 mg; and can
be mounted in any position.
Dimensions in inches (mm)
97
For Most Recent Data, Consult the Coto Technology Website: www.cotorelay.com 6 E-mail: info@cotorelay.com
RI-29 Series Dry Reed Switch
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 10 G; below cross-over
frequency 57 to 62 Hz; amplitude 0.75 mm; fre-
quency range 10 to 2000 Hz, duration 90 minutes in
each direction). 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:
+75°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.
Model Number
RI-29AA RI-29A
Parameters Test Conditions Units
Operating Characteristics
Operate Range AT 16-25 20-34
Release Range AT 5-18 7-19.5
Operate Time - including bounce (typ.) (energization) ms 0.25 (31 AT) 0.25 (42.5 AT)
Bounce Time (typ.) (energization) ms 0.05 (31 AT) 0.05 (42.5 AT)
Release Time (max) (energization)
µ
s30 (31 AT) 30 (42.5 AT)
Resonant Frequency (typ.) Hz 6500 6500
Electrical Characteristics
Switched Power (max) W 15 20
Switched Voltage DC (max) V 200 200
Switched Voltage AC, RMS value (max) V 140 140
Switched Current DC (max) mA 1000 1000
Switched Current AC, RMS value (max) mA 1000 1000
Carry Current DC; AC, RMS value (max) A 1.25 1.25
Breakdown Voltage (min) V 250 280
Contact Resistance (initial max) (energization) m
Ω
115 (25 AT) 115 (25 AT)
Contact Resistance (initial typ.) (energization) m
Ω
90 (25 AT) 90 (25 AT)
Contact Capacitance (max) without test coil pF 0.3 0.25
Insulation Resistance (min) RH
≤
45% M
Ω
10
6
10
6
