3500 Series/Low Thermal EMF Reed Relays L OW 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. 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 SERIES FEATURES u u u u u u u u Low Thermal EMF: < 10 µV through < 0.5 µV with 50 nV stability. Patented Low Thermal Design. Patent #4,084,142. Low power coils to ensure low thermal EMF. High Insulation Resistance - 1012 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) Bottom View (For Model #’s 3502, 3520, 3541) 2 Dimensions in Inches (Millimeters) COTO TECHNOLOGY RHOPOINT COMPONENTS LTD, Email: [email protected] Website: www.rhopoint.co.uk 3500 Series/Low Thermal EMF Reed Relays Model Number Parameters THERMAL EMF ….OPTIONS COIL SPECS. Nom. Coil Voltage Coil Resistance Operate Voltage Release Voltage Test Conditions Measured after 5 minutes at nominal coil voltage Refer to Reed Relay Technical Section for Details Units 3501 2 3502 2 3520 2,3 1 Form A 2 Form A 2 Form A 3540 2 3541 2 1 Form A 2 Form A High Voltage High Voltage µV Individual <5µV <3µV <1µV <0.5µV Differential <5µV <3µV <1µV <0.5µV Differential <10µV <5µV - Individual <5µV <3µV - Differential <5µV <3µV - VDC 5 12 350 2000 3.8 9.0 0.4 1.0 5 200 3.8 0.4 5 12 200 1500 3.8 9.0 0.4 1.0 5 12 200 1500 3.8 9.0 0.4 1.0 +/- 10%, 25° C Must Operate by Must Release by Ω VDC - Max. VDC - Min. 5 12 350 2000 3.8 9.0 0.4 1.0 12 850 9.0 1.0 CONTACT RATING Switching Voltage Switching Current Carry Current Contact Rating Max DC/Peak AC Resist. Max DC/Peak AC Resist. Max DC/Peak AC Resist. Max DC/Peak AC Resist. Volts Amps Amps Watts 200 0.5 1.5 10 200 0.5 1.5 10 500 1.0 2.0 28 500 0.5 2.0 10 500 0.5 2.0 10 Life Expectancy-Typical 1 Signal Level 1.0V, 10mA x 106 Ops. 500 100 1000 100 100 Static Contact Resistance (max. init.) 50mV, 10mA Ω 0.200 0.100 0.050 0.200 0.100 Dynamic Contact Resistance (max. init.) 0.5V, 50mA at 100 Hz, 1.5 msec Ω 0.300 0.200 0.100 0.300 0.200 RELAY SPECIFICATIONS Insulation Resistance (minimum) Between all Isolated Pins at 100V, 25°C, 40% RH Ω x 1012 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 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, 30 Hz Square Wave msec. 0.75 0.75 2.0 1.0 1.0 Release Time - Typical Zener-Diode Suppression4 msec. 0.1 0.1 1.0 0.2 0.2 Dielectric Strength (minimum) Top View: Dot stamped on top of relay refers to pin #1 location Grid = .1"x.1" (2.54mm x 2.54mm) Notes: Environmental Ratings 1 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 Consult factory for life expectancy at other switching loads. 2 Models 3501 and 3540, optional electrostatic shield is tied to pin #5. Models 3502, 3520 and 3541, optional electrostatic 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. 4 Consists of 20V Zener-diode and 1N4002 diode in series, connected in parallel with coil COTO TECHNOLOGY RHOPOINT COMPONENTS LTD Holland Rd, Hurst Green, Oxted, Surrey, RH8 9AX,ENGLAND