INDEX SECTION CONTENTS PAGE NO. 1.0 DESCRIPTION1 2.0 SPECIFICATION1 SEM1020 3.0 INSTALLATION2 4.0 OPERATION 3 5.0 CALIBRATION 3 6.0 MECHANICAL 3 (4 to 20) mA Isolator/Loop Booster Status Instruments Ltd, Green Lane Business Park, Tewkesbury, Glos. GL20 8DE Tel: +44 (0)1684 296818 Fax: +44 (0)1684 293746 Email: sales status.co.uk Web: www.status.co.uk 52-214-2410-01 Issue: Web 1020 1.0 DESCRIPTION 3.0 INSTALLATION The SEM1020 isolator is designed for use when power is available at both sides of the isolation barrier. 3.1 MECHANICAL This isolator is designed to be housed within a suitable enclosure that will provide protection from the 2.0 SPECIFICATIONS external environment, and ensure the stated temperature and humidity ranges are not exceeded. The isolator case is designed to snap fit onto a standard Top Hat DIN rail. The isolator may be removed if required by applying pressure with one hand, to the bottom face of the enclosure, in a direction parallel with the DIN rail and at the same time gripping the top of the isolator and pulling away from the rail. The 2.1 INPUT isolator may be mounted in any orientation and stacked side by side along the rail. Type Current input 2 wire loop powered Incorrect connection in the loop will not damage the device as long as the specified maximum currents Range (4 to 20) mA (30 mA max.) /voltages are not exceeded. If the isolator fails to operate, check loop for bad connections. Ensure enough Protection Reverse connection voltage is available in the loop to power the isolator. In the unlikely event of the isolator not working, it Voltage Drop 2.7 V maximum should be returned to the supplier for repair or replacement. Max. Loop Volts 35 V 3.2 ELECTRICAL 2.2 OUTPUT Connections to the isolator are made via screw terminals. Wire protector plates are provided inside each terminal. To maintain compliance twisted pair (screened) cables are recommended. It is also good practice Type 2 wire Current Sink (4 to 20) mA to ensure that all (4 to 20) mA loops are grounded at a single point in the loop. Before installation, care Loop Voltage (5 to 32) VDC (reverse protected) must be taken to ensure enough voltage is available in the loop to drive the total loop load. Refer to the specifications listed above for the loop drop voltage. The SEM1020 in most applications, requires a separate Loop Volt Drop = 2.7 V Load = 900 Vs=24 V supply for the secondary loop, this may be provided from a separate power supply or from the instrument Load = 1200 Vs=30 V monitoring the output loop. Loads must be > 250 for ambients > 50 C Refer to the SEM1000 series data sheet for further information on applications of this series of isolators. Please note the isolation provided by this device is only suitable for providing isolation between two process signals and therefore must not be used to provide isolation from hazardous voltages, such as mains 2.3 GENERAL SPECIFICATION 20C supplies. Isolation 500 VAC (flash tested 1 kV) (Isolation method, opto coupler/transformer) Figure 1 Environment BS EN61010-1 Pollution Degree 2 Installation CAT II CLASS I Ambient (0 to 70) C (10 to 95) % RH non condensing Linearity 0.05 % Stability 0.01 %/C INPUT Response Time Less than 100 ms to reach 70 % of final value. (4 to 20) mA EMC Tested to IEC 801-2 Susceptibility to E.S.D. OUTPUT OUT ISOLATION IEC 801-3 Radiated Susceptibility + + (4 to 20) mA IEC 801-4 Susceptibility to conducted interference SPAN EN55022 Radiated Emissions Connection Captive clamp screws ZERO - Cable Size Maximum 4 mm solid / 2.5 mm stranded SPAN Vs Vsupply Case Material Grey Polyamide SEM1020 Flammability To UL94-VO VDE 0304 Part 3, Level IIIA Dimensions Case A: (60 x 60 x 12.5) mm (67.5 mm above rail) Mounting Snap onTop Ha rail (DIN EN 50022-35) LOAD Adjustment Front Entry Fine Zero and Span Adjustment ZERO - IN Page 1 Page 2