3501 RHOPOINT | Alldatasheet
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Technical content
L LL LLOW OWOW OWOW T T T T THERMAL HERMALHERMAL HERMALHERMAL EMF R EMF R EMF R EMF R EMF R EED EEDEED EEDEED R R R R RELAYS ELAYSELAYS ELAYSELAYS 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. Recommended 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. Refer to page 41 for Thermal EMF test methods.
3500 S 3500 S3500 S 3500 S3500 SERIES ERIESERIES ERIESERIES F F F F FEATURES EATURESEATURES EATURESEATURES
u Low Thermal EMF: < 10 µV through < 0.5 µV with 50 nV stability. u Patented Low Thermal Design. Patent #4,084,142. u Low power coils to ensure low thermal EMF. u High Insulation Resistance - 1012 Ω u Control/Signal isolation of 1500 VDC u High reliability, hermetically sealed contacts. u Form A, Dry or Hg Wet contacts. High Dielectric Strength. u Epoxy coated steel shell provides magnetic shielding.
3500 Series/Low Thermal EMF Reed Relays
Dimensions in Inches (Millimeters) (For Model #’s 3501 & 3540) (For Model #’s 3502, 3520, 3541) Bottom View
COTO TECHNOLOGY RHOPOINT COMPONENTS LTD Holland Rd, Hurst Green, Oxted, Surrey, RH8 9AX,ENGLAND Model Number 3501 2 3502 2 3520 2,3 3540 2 3541 2 Parameters Test Conditions Units 1 Form A 2 Form A 2 Form A 1 Form A High Voltage
2 Form A
…. OPTIONS Measured after 5 minutes at nominal coil voltage Refer to Reed Relay Technical Section for Details µV Individual <5µV <3µV <1µV <0.5µV Differential <5µV <3µV <1µV <0.5µV Differential <10µV <5µV Individual <5µV <3µV Differential <5µV <3µV COIL SPECS. Nom. Coil Voltage VDC 5 12 5 12 5 12 5 12 5 12 Coil Resistance +/- 10%, 25° C Ω 350 2000 350 2000 200 850 200 1500 200 1500 CONTACT RATING Switching Voltage Max DC/Peak AC Resist. Volts 200 200 500 500 500 Contact Rating Max DC/Peak AC Resist. Watts 10 10 28 10 10 Life Expectancy-Typical Signal Level 1.0V, 10mA x 106 Ops. 500 100 1000 100 100 Static Contact Dynamic Contact Resistance (max. init.) 0.5V, 50mA RELAY SPECIFICATIONS Insulation Resistance (minimum) Between all Isolated Pins at 100V, 25°C, 40% RH Ω x 10 12 x 1012 x 1012 x 1012 x 1012 Capacitance - Typical Across Open Contacts Without shield Shield Guarding pF pF 3.0 1.9 1.7 0.2 1.7 0.2 3.0 1.9 1.7 0.2 Dielectric Strength (minimum) Between Contacts Contacts to Shield Contacts/Shield to Coil VDC/peak AC VDC/peak AC VDC/peak AC 700 1000 1500 350 1000 1500 1000 1000 1500 1500 1000 1500 1500 1000 1500 Operate Time - including bounce - Typical At Nominal Coil Voltage, Release Time - Typical Zener-Diode Suppression Notes: 1Consult factory for life expectancy at other switching loads. 2Models 3501 and 3540, optional electrostatic shield is tied to pin #5. Models 3502, 3520 and 3541, optional electrostatic shield is tied to pin #13. 3Model 3520 has Hg wet contacts - position sensitive, must be mounted within 30° of vertical plane. See schematic. 4Consists of 20V Zener-diode and 1N4002 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 Top View: Dot stamped on top of relay refers to pin #1 location Grid = .1"x.1" (2.54mm x 2.54mm)