INDEX SECTION CONTENTS PAGE NO. 1.0 DESCRIPTION1 2.0 SPECIFICATION1 SEM1000 3.0 INSTALLATION2 4.0 OPERATION 3 5.0 CALIBRATION 3 6.0 MECHANICAL 3 (4 to 20) mA Loop Isolator 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 10001.0 DESCRIPTION 3.0 INSTALLATION The SEM1000 isolator is designed to be series connected into a new or existing (4 to 20) mA current loop and provide an isolated (4 to 20) mA signal capable of driving into 500 R. The output is powered from the 3.1 MECHANICAL input loop. This unit must be housed within a suitable enclosure that will provide protection from the external 2.0 SPECIFICATIONS environment, ensuring that the stated temperature and humidity operating ranges are not exceeded. It is good practice to mount the unit away from sources of electrical noise, such as switch gear and transformers. The unit enclosure is designed to snap fit onto a standardTop Ha DIN rail. To remove from 2.1 INPUT rail, apply pressure at the bottom face at the back upwards towards the rail to release the spring clip and tip away from the top. The unit may be mounted in any orientation and stacked side by side along the rail. Type Current input 2 wire loop powered Range (4 to 20) mA (30 mA maximum) 3.2 ELECTRICAL Protection Reverse connection Voltage Drop 5.5 V + O/P V Drop (O/P V Drop = O/P load x 0.02) Max Loop Supply 35 V Connections to the isolator are made via screw terminals. Wire protector plates are provided inside each terminal. To maintain CE compliance twisted pair (screened) cables are recommended. It is also good practice to ensure that all (4 to 20) mA loops are grounded at a single point in the loop. Before installation, care 2.2 OUTPUT must be taken to ensure enough voltage is available in the loop to drive the total loop load. Refer to the specifications listed for the voltage drop. In the case of the SEM1000 the additional voltage drop of the load connected in the isolated circuit, will be added to the loop drop of the isolator, for example a Type (4 to 20) mA source (Powered from input) SEM1000 isolator driving into a 250 W load will have a total loop drop of 10.5 V maximum. Load (0 to 500) (O/C limits at approximately 15 V) 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) Electrical Safety BS EN61010-1 Pollution Degree 2 Installation CAT II CLASS I Ambient (0 to 70) C (10 to 95) % RH non condensing Figure 1 Accuracy 0.05 % full range output Stability 0.01 %/C Response Time Less than 100 ms to reach 63 % of final value. EMC Compliant with BS EN50081-1, BS EN50082-1 ISOLATION Connection Captive clamp screws + OUT Cable Size Maximum 4 mm solid/2.5 mm stranded + Case Material Grey Polyamide LOAD SPAN Flammability To UL94-VO VDE 0304 Part 3, Level IIIA INPUT Dimensions (60 x 60 x 12.5) mm (67.5 mm above rail) ZERO - (4 to 20) mA SPAN 18 V Mounting Snap onTop Ha rail (DIN EN 50022-35) OUTPUT Adjustments Zero and Span Adjustment (4 to 20) mA SEM1000 ZERO - IN Page 1 Page 2