3500 Series/Low Thermal EMF Reed Relays
Low Thermal EMF Reed Relays
The 3500 Series is ideally suited to the needs of Instrumentation, Data
Acquisition and Process Control. The specification tables allow you to
select the appropriate relay for your particular application. Recom-
mended for use in high accuracy DVM’s, Multiplexers and Digital or
Analog Multipoint Recorders. If your requirements differ from the
selection options, please consult Coto’s Factory to discuss a custom
reed relay.
3500 Series Features
Low Thermal EMF: < 10 µV through < 0.5 µV with 50 nV stabilit
y
Patented Low Thermal Design. U.S. Patent #4,084,142
Low power coils to ensure low thermal EMF
High Insulation Resistance - 10
12
Ω
Control/Signal isolation of 1500 VDC
High reliability, hermetically sealed contacts
Form A, Dry or Hg Wet contacts. High Dielectric Strength
Epoxy coated steel shell provides magnetic shielding
(For Model #’s
3501 & 3540)
(For Model #’s
3502, 3520, 3541)
Bottom View
Dimensions in Inches (Millimeters)
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COTO TECHNOLOGY (USA)
Tel:
(401) 943-2686 / Fax (401) 942-0920
6
(Europe) Tel: +31-45-5439343 / Fax +31-45-5427216
3500 Series/Low Thermal EMF Reed Relays
Top View:
Dot stamped on top of relay refers to pin #1 location
Grid = .1"x.1" (2.54mm x 2.54mm)
Notes:
1
2
Consult factory for life expectancy at other switching loads.
Models 3501 and 3540, optional electrostatic shield is tied
to pin #5. Models 3502, 3520 and 3541, optional electro-
static shield is tied to pin #13.
3
Model 3520 has Hg wet contacts - position sensitive, must be
mounted within 30° of vertical plane. See schematic.
Hg Content per capsule: Form A, 0.04 grams.
4
Consists of 56V Zener diode and 1N4148 diode in series,
connected in parallel with coil.
Environmental Ratings:
Storage Temp: -35°C to +100°C;
Operating Temp: -20°C to +85°C
Solder Temp: 270°C max; 10 sec. max
The operate and release voltage and the coil
resistance are specified at 25°C. These values
vary by approximately 0.4% / °C as the ambient
temperature varies.
Vibration: 20 G’s to 2000 Hz; Shock: 50 G’s
6
E-mail: sales@cotorelay.com
For Most Recent Data, Consult the Coto Technology Website:
www.cotorelay.com
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